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Overview
Comment: | Added FOR EACH ROW triggers functionality (CVS 562) |
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Downloads: | Tarball | ZIP archive |
Timelines: | family | ancestors | descendants | both | trunk |
Files: | files | file ages | folders |
SHA1: |
794bf67b6b36fce8854d5daff12f21db |
User & Date: | danielk1977 2002-05-15 08:30:13.000 |
Context
2002-05-15
| ||
08:43 | Add the Makefile.in that was forgotten with checkin #562 (CVS 563) (check-in: 29b8330ca6 user: danielk1977 tags: trunk) | |
08:30 | Added FOR EACH ROW triggers functionality (CVS 562) (check-in: 794bf67b6b user: danielk1977 tags: trunk) | |
2002-05-10
| ||
14:41 | Version 2.4.12 (CVS 561) (check-in: 06cdaf1c80 user: drh tags: trunk) | |
Changes
Changes to src/build.c.
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21 22 23 24 25 26 27 | ** COPY ** VACUUM ** BEGIN TRANSACTION ** COMMIT ** ROLLBACK ** PRAGMA ** | | | 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 | ** COPY ** VACUUM ** BEGIN TRANSACTION ** COMMIT ** ROLLBACK ** PRAGMA ** ** $Id: build.c,v 1.88 2002/05/15 08:30:13 danielk1977 Exp $ */ #include "sqliteInt.h" #include <ctype.h> /* ** This routine is called after a single SQL statement has been ** parsed and we want to execute the VDBE code to implement |
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246 247 248 249 250 251 252 253 254 255 256 257 258 259 | pIndex->isCommit = 1; } while( (pElem=sqliteHashFirst(&db->idxDrop))!=0 ){ Index *pIndex = sqliteHashData(pElem); sqliteUnlinkAndDeleteIndex(db, pIndex); } sqliteHashClear(&db->idxDrop); db->flags &= ~SQLITE_InternChanges; } /* ** This routine runs when one or more CREATE TABLE, CREATE INDEX, ** DROP TABLE, or DROP INDEX statements gets rolled back. The ** additions or deletions of Table and Index structures in the | > > > > > > > > > > > > > > > > | 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 | pIndex->isCommit = 1; } while( (pElem=sqliteHashFirst(&db->idxDrop))!=0 ){ Index *pIndex = sqliteHashData(pElem); sqliteUnlinkAndDeleteIndex(db, pIndex); } sqliteHashClear(&db->idxDrop); /* Set the commit flag on all triggers added this transaction */ for(pElem=sqliteHashFirst(&db->trigHash); pElem; pElem=sqliteHashNext(pElem)){ Trigger *pTrigger = sqliteHashData(pElem); pTrigger->isCommit = 1; } /* Delete the structures for triggers removed this transaction */ pElem = sqliteHashFirst(&db->trigDrop); while (pElem) { Trigger *pTrigger = sqliteHashData(pElem); sqliteDeleteTrigger(pTrigger); pElem = sqliteHashNext(pElem); } sqliteHashClear(&db->trigDrop); db->flags &= ~SQLITE_InternChanges; } /* ** This routine runs when one or more CREATE TABLE, CREATE INDEX, ** DROP TABLE, or DROP INDEX statements gets rolled back. The ** additions or deletions of Table and Index structures in the |
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300 301 302 303 304 305 306 307 308 309 310 311 312 313 | Index *pOld, *p = sqliteHashData(pElem); assert( p->isCommit ); p->isDropped = 0; pOld = sqliteHashInsert(&db->idxHash, p->zName, strlen(p->zName)+1, p); assert( pOld==0 || pOld==p ); } sqliteHashClear(&db->idxDrop); db->flags &= ~SQLITE_InternChanges; } /* ** Construct the name of a user table or index from a token. ** ** Space to hold the name is obtained from sqliteMalloc() and must | > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > | 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 | Index *pOld, *p = sqliteHashData(pElem); assert( p->isCommit ); p->isDropped = 0; pOld = sqliteHashInsert(&db->idxHash, p->zName, strlen(p->zName)+1, p); assert( pOld==0 || pOld==p ); } sqliteHashClear(&db->idxDrop); /* Remove any triggers that haven't been commited yet */ for(pElem = sqliteHashFirst(&db->trigHash); pElem; pElem = (pElem?sqliteHashNext(pElem):0)) { Trigger * pTrigger = sqliteHashData(pElem); if (!pTrigger->isCommit) { Table * tbl = sqliteFindTable(db, pTrigger->table); if (tbl) { if (tbl->pTrigger == pTrigger) tbl->pTrigger = pTrigger->pNext; else { Trigger * cc = tbl->pTrigger; while (cc) { if (cc->pNext == pTrigger) { cc->pNext = cc->pNext->pNext; break; } cc = cc->pNext; } assert(cc); } } sqliteHashInsert(&db->trigHash, pTrigger->name, 1 + strlen(pTrigger->name), 0); sqliteDeleteTrigger(pTrigger); pElem = sqliteHashFirst(&db->trigHash); } } /* Any triggers that were dropped - put 'em back in place */ for(pElem = sqliteHashFirst(&db->trigDrop); pElem; pElem = sqliteHashNext(pElem)) { Trigger * pTrigger = sqliteHashData(pElem); Table * tab = sqliteFindTable(db, pTrigger->table); sqliteHashInsert(&db->trigHash, pTrigger->name, strlen(pTrigger->name) + 1, pTrigger); pTrigger->pNext = tab->pTrigger; tab->pTrigger = pTrigger; } sqliteHashClear(&db->trigDrop); db->flags &= ~SQLITE_InternChanges; } /* ** Construct the name of a user table or index from a token. ** ** Space to hold the name is obtained from sqliteMalloc() and must |
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591 592 593 594 595 596 597 | ** ** This plan is not completely bullet-proof. It is possible for ** the schema to change multiple times and for the cookie to be ** set back to prior value. But schema changes are infrequent ** and the probability of hitting the same cookie value is only ** 1 chance in 2^32. So we're safe enough. */ | | | 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 | ** ** This plan is not completely bullet-proof. It is possible for ** the schema to change multiple times and for the cookie to be ** set back to prior value. But schema changes are infrequent ** and the probability of hitting the same cookie value is only ** 1 chance in 2^32. So we're safe enough. */ void changeCookie(sqlite *db){ if( db->next_cookie==db->schema_cookie ){ db->next_cookie = db->schema_cookie + sqliteRandomByte() + 1; db->flags |= SQLITE_InternChanges; } } /* |
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1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 | { OP_Next, 0, ADDR(4), 0}, /* 8 */ { OP_Integer, 0, 0, 0}, /* 9 */ { OP_SetCookie, 0, 0, 0}, { OP_Close, 0, 0, 0}, }; Index *pIdx; sqliteBeginWriteOperation(pParse); if( !pTable->isTemp ){ base = sqliteVdbeAddOpList(v, ArraySize(dropTable), dropTable); sqliteVdbeChangeP3(v, base+2, pTable->zName, 0); changeCookie(db); sqliteVdbeChangeP1(v, base+9, db->next_cookie); } if( !isView ){ | > > > > > > > | 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 | { OP_Next, 0, ADDR(4), 0}, /* 8 */ { OP_Integer, 0, 0, 0}, /* 9 */ { OP_SetCookie, 0, 0, 0}, { OP_Close, 0, 0, 0}, }; Index *pIdx; sqliteBeginWriteOperation(pParse); /* Drop all triggers associated with the table being dropped */ while (pTable->pTrigger) { Token tt; tt.z = pTable->pTrigger->name; tt.n = strlen(pTable->pTrigger->name); sqliteDropTrigger(pParse, &tt, 1); } if( !pTable->isTemp ){ base = sqliteVdbeAddOpList(v, ArraySize(dropTable), dropTable); sqliteVdbeChangeP3(v, base+2, pTable->zName, 0); changeCookie(db); sqliteVdbeChangeP1(v, base+9, db->next_cookie); } if( !isView ){ |
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1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 | ** all. So there is not need to set a checkpoint is a transaction ** is already in effect. */ void sqliteBeginWriteOperation(Parse *pParse){ Vdbe *v; v = sqliteGetVdbe(pParse); if( v==0 ) return; if( (pParse->db->flags & SQLITE_InTrans)==0 ){ sqliteVdbeAddOp(v, OP_Transaction, 0, 0); sqliteVdbeAddOp(v, OP_VerifyCookie, pParse->db->schema_cookie, 0); pParse->schemaVerified = 1; } } /* ** Generate VDBE code that prepares for doing an operation that ** might change the database. The operation might not be atomic in ** the sense that an error may be discovered and the operation might ** abort after some changes have been made. If we are in the middle ** of a transaction, then this sets a checkpoint. If we are not in ** a transaction, then start a transaction. */ void sqliteBeginMultiWriteOperation(Parse *pParse){ Vdbe *v; v = sqliteGetVdbe(pParse); if( v==0 ) return; if( (pParse->db->flags & SQLITE_InTrans)==0 ){ sqliteVdbeAddOp(v, OP_Transaction, 0, 0); sqliteVdbeAddOp(v, OP_VerifyCookie, pParse->db->schema_cookie, 0); pParse->schemaVerified = 1; }else{ sqliteVdbeAddOp(v, OP_Checkpoint, 0, 0); } } /* ** Generate code that concludes an operation that may have changed ** the database. This is a companion function to BeginWriteOperation(). ** If a transaction was started, then commit it. If a checkpoint was ** started then commit that. */ void sqliteEndWriteOperation(Parse *pParse){ Vdbe *v; v = sqliteGetVdbe(pParse); if( v==0 ) return; if( pParse->db->flags & SQLITE_InTrans ){ /* Do Nothing */ }else{ sqliteVdbeAddOp(v, OP_Commit, 0, 0); } | > > > | 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 | ** all. So there is not need to set a checkpoint is a transaction ** is already in effect. */ void sqliteBeginWriteOperation(Parse *pParse){ Vdbe *v; v = sqliteGetVdbe(pParse); if( v==0 ) return; if (pParse->trigStack) return; /* if this is in a trigger */ if( (pParse->db->flags & SQLITE_InTrans)==0 ){ sqliteVdbeAddOp(v, OP_Transaction, 0, 0); sqliteVdbeAddOp(v, OP_VerifyCookie, pParse->db->schema_cookie, 0); pParse->schemaVerified = 1; } } /* ** Generate VDBE code that prepares for doing an operation that ** might change the database. The operation might not be atomic in ** the sense that an error may be discovered and the operation might ** abort after some changes have been made. If we are in the middle ** of a transaction, then this sets a checkpoint. If we are not in ** a transaction, then start a transaction. */ void sqliteBeginMultiWriteOperation(Parse *pParse){ Vdbe *v; v = sqliteGetVdbe(pParse); if( v==0 ) return; if (pParse->trigStack) return; /* if this is in a trigger */ if( (pParse->db->flags & SQLITE_InTrans)==0 ){ sqliteVdbeAddOp(v, OP_Transaction, 0, 0); sqliteVdbeAddOp(v, OP_VerifyCookie, pParse->db->schema_cookie, 0); pParse->schemaVerified = 1; }else{ sqliteVdbeAddOp(v, OP_Checkpoint, 0, 0); } } /* ** Generate code that concludes an operation that may have changed ** the database. This is a companion function to BeginWriteOperation(). ** If a transaction was started, then commit it. If a checkpoint was ** started then commit that. */ void sqliteEndWriteOperation(Parse *pParse){ Vdbe *v; if (pParse->trigStack) return; /* if this is in a trigger */ v = sqliteGetVdbe(pParse); if( v==0 ) return; if( pParse->db->flags & SQLITE_InTrans ){ /* Do Nothing */ }else{ sqliteVdbeAddOp(v, OP_Commit, 0, 0); } |
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1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 | int size = db->cache_size; if( size<0 ) size = -size; if( !getBoolean(zRight) ) size = -size; db->cache_size = size; sqliteBtreeSetCacheSize(db->pBe, db->cache_size); } }else if( sqliteStrICmp(zLeft, "vdbe_trace")==0 ){ if( getBoolean(zRight) ){ db->flags |= SQLITE_VdbeTrace; }else{ db->flags &= ~SQLITE_VdbeTrace; } | > > > > > > > > | 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 | int size = db->cache_size; if( size<0 ) size = -size; if( !getBoolean(zRight) ) size = -size; db->cache_size = size; sqliteBtreeSetCacheSize(db->pBe, db->cache_size); } }else if( sqliteStrICmp(zLeft, "trigger_overhead_test")==0 ){ if( getBoolean(zRight) ){ always_code_trigger_setup = 1; }else{ always_code_trigger_setup = 0; } }else if( sqliteStrICmp(zLeft, "vdbe_trace")==0 ){ if( getBoolean(zRight) ){ db->flags |= SQLITE_VdbeTrace; }else{ db->flags &= ~SQLITE_VdbeTrace; } |
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Changes to src/delete.c.
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8 9 10 11 12 13 14 | ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** This file contains C code routines that are called by the parser ** to handle DELETE FROM statements. ** | | | 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** This file contains C code routines that are called by the parser ** to handle DELETE FROM statements. ** ** $Id: delete.c,v 1.31 2002/05/15 08:30:13 danielk1977 Exp $ */ #include "sqliteInt.h" /* ** Given a table name, find the corresponding table and make sure the ** table is writeable. Generate an error and return NULL if not. If |
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80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 | int i; /* Loop counter */ WhereInfo *pWInfo; /* Information about the WHERE clause */ Index *pIdx; /* For looping over indices of the table */ int base; /* Index of the first available table cursor */ sqlite *db; /* Main database structure */ int openOp; /* Opcode used to open a cursor to the table */ if( pParse->nErr || sqlite_malloc_failed ){ pTabList = 0; goto delete_from_cleanup; } db = pParse->db; /* Locate the table which we want to delete. This table has to be ** put in an IdList structure because some of the subroutines we ** will be calling are designed to work with multiple tables and expect ** an IdList* parameter instead of just a Table* parameger. */ pTabList = sqliteTableTokenToIdList(pParse, pTableName); if( pTabList==0 ) goto delete_from_cleanup; assert( pTabList->nId==1 ); pTab = pTabList->a[0].pTab; assert( pTab->pSelect==0 ); /* This table is not a view */ /* Resolve the column names in all the expressions. */ base = pParse->nTab++; if( pWhere ){ if( sqliteExprResolveIds(pParse, base, pTabList, 0, pWhere) ){ goto delete_from_cleanup; } if( sqliteExprCheck(pParse, pWhere, 0, 0) ){ goto delete_from_cleanup; } } /* Begin generating code. */ v = sqliteGetVdbe(pParse); if( v==0 ) goto delete_from_cleanup; | > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > | | | 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 | int i; /* Loop counter */ WhereInfo *pWInfo; /* Information about the WHERE clause */ Index *pIdx; /* For looping over indices of the table */ int base; /* Index of the first available table cursor */ sqlite *db; /* Main database structure */ int openOp; /* Opcode used to open a cursor to the table */ int row_triggers_exist = 0; int oldIdx = -1; if( pParse->nErr || sqlite_malloc_failed ){ pTabList = 0; goto delete_from_cleanup; } db = pParse->db; /* Check for the special case of a VIEW with one or more ON DELETE triggers * defined */ { Table * pTab; char * zTab = sqliteTableNameFromToken(pTableName); if(zTab != 0) { pTab = sqliteFindTable(pParse->db, zTab); if (pTab) { row_triggers_exist = sqliteTriggersExist(pParse, pTab->pTrigger, TK_DELETE, TK_BEFORE, TK_ROW, 0) || sqliteTriggersExist(pParse, pTab->pTrigger, TK_DELETE, TK_AFTER, TK_ROW, 0); } sqliteFree(zTab); if (row_triggers_exist && pTab->pSelect ) { /* Just fire VIEW triggers */ sqliteViewTriggers(pParse, pTab, pWhere, OE_Replace, 0); return; } } } /* Locate the table which we want to delete. This table has to be ** put in an IdList structure because some of the subroutines we ** will be calling are designed to work with multiple tables and expect ** an IdList* parameter instead of just a Table* parameger. */ pTabList = sqliteTableTokenToIdList(pParse, pTableName); if( pTabList==0 ) goto delete_from_cleanup; assert( pTabList->nId==1 ); pTab = pTabList->a[0].pTab; assert( pTab->pSelect==0 ); /* This table is not a view */ if (row_triggers_exist) oldIdx = pParse->nTab++; /* Resolve the column names in all the expressions. */ base = pParse->nTab++; if( pWhere ){ if( sqliteExprResolveIds(pParse, base, pTabList, 0, pWhere) ){ goto delete_from_cleanup; } if( sqliteExprCheck(pParse, pWhere, 0, 0) ){ goto delete_from_cleanup; } } /* Begin generating code. */ v = sqliteGetVdbe(pParse); if( v==0 ) goto delete_from_cleanup; if (row_triggers_exist) sqliteBeginMultiWriteOperation(pParse); else sqliteBeginWriteOperation(pParse); /* Initialize the counter of the number of rows deleted, if ** we are counting rows. */ if( db->flags & SQLITE_CountRows ){ sqliteVdbeAddOp(v, OP_Integer, 0, 0); } /* Special case: A DELETE without a WHERE clause deletes everything. ** It is easier just to erase the whole table. */ if( pWhere==0 && !row_triggers_exist){ if( db->flags & SQLITE_CountRows ){ /* If counting rows deleted, just count the total number of ** entries in the table. */ int endOfLoop = sqliteVdbeMakeLabel(v); int addr; openOp = pTab->isTemp ? OP_OpenAux : OP_Open; assert( base==0 ); |
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172 173 174 175 176 177 178 179 180 181 | sqliteWhereEnd(pWInfo); /* Delete every item whose key was written to the list during the ** database scan. We have to delete items after the scan is complete ** because deleting an item can change the scan order. */ sqliteVdbeAddOp(v, OP_ListRewind, 0, 0); openOp = pTab->isTemp ? OP_OpenWrAux : OP_OpenWrite; sqliteVdbeAddOp(v, openOp, base, pTab->tnum); for(i=1, pIdx=pTab->pIndex; pIdx; i++, pIdx=pIdx->pNext){ | > > > > > > > > > > > > > > > > > > > > > > > > > > > > > | | > | > | > > > > > > > > > > > > > > > > > > | 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 | sqliteWhereEnd(pWInfo); /* Delete every item whose key was written to the list during the ** database scan. We have to delete items after the scan is complete ** because deleting an item can change the scan order. */ sqliteVdbeAddOp(v, OP_ListRewind, 0, 0); end = sqliteVdbeMakeLabel(v); if (row_triggers_exist) { int ii; addr = sqliteVdbeAddOp(v, OP_ListRead, 0, end); sqliteVdbeAddOp(v, OP_Dup, 0, 0); openOp = pTab->isTemp ? OP_OpenAux : OP_Open; sqliteVdbeAddOp(v, openOp, base, pTab->tnum); sqliteVdbeAddOp(v, OP_MoveTo, base, 0); sqliteVdbeAddOp(v, OP_OpenTemp, oldIdx, 0); sqliteVdbeAddOp(v, OP_Integer, 13, 0); for (ii = 0; ii < pTab->nCol; ii++) { if (ii == pTab->iPKey) sqliteVdbeAddOp(v, OP_Recno, base, 0); else sqliteVdbeAddOp(v, OP_Column, base, ii); } sqliteVdbeAddOp(v, OP_MakeRecord, pTab->nCol, 0); sqliteVdbeAddOp(v, OP_PutIntKey, oldIdx, 0); sqliteVdbeAddOp(v, OP_Close, base, 0); sqliteVdbeAddOp(v, OP_Rewind, oldIdx, 0); sqliteCodeRowTrigger(pParse, TK_DELETE, 0, TK_BEFORE, pTab, -1, oldIdx, (pParse->trigStack)?pParse->trigStack->orconf:OE_Default); } pParse->nTab = base + 1; openOp = pTab->isTemp ? OP_OpenWrAux : OP_OpenWrite; sqliteVdbeAddOp(v, openOp, base, pTab->tnum); for(i=1, pIdx=pTab->pIndex; pIdx; i++, pIdx=pIdx->pNext){ sqliteVdbeAddOp(v, openOp, pParse->nTab++, pIdx->tnum); } if (!row_triggers_exist) addr = sqliteVdbeAddOp(v, OP_ListRead, 0, end); sqliteGenerateRowDelete(v, pTab, base, pParse->trigStack?0:1); if (row_triggers_exist) { for(i=1, pIdx=pTab->pIndex; pIdx; i++, pIdx=pIdx->pNext){ sqliteVdbeAddOp(v, OP_Close, base + i, pIdx->tnum); } sqliteVdbeAddOp(v, OP_Close, base, 0); sqliteCodeRowTrigger(pParse, TK_DELETE, 0, TK_AFTER, pTab, -1, oldIdx, (pParse->trigStack)?pParse->trigStack->orconf:OE_Default); } sqliteVdbeAddOp(v, OP_Goto, 0, addr); sqliteVdbeResolveLabel(v, end); sqliteVdbeAddOp(v, OP_ListReset, 0, 0); if (!row_triggers_exist) { for(i=1, pIdx=pTab->pIndex; pIdx; i++, pIdx=pIdx->pNext){ sqliteVdbeAddOp(v, OP_Close, base + i, pIdx->tnum); } sqliteVdbeAddOp(v, OP_Close, base, 0); pParse->nTab = base; } } sqliteEndWriteOperation(pParse); /* ** Return the number of rows that were deleted. */ if( db->flags & SQLITE_CountRows ){ |
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Changes to src/expr.c.
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8 9 10 11 12 13 14 | ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** This file contains routines used for analyzing expressions and ** for generating VDBE code that evaluates expressions in SQLite. ** | | | 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** This file contains routines used for analyzing expressions and ** for generating VDBE code that evaluates expressions in SQLite. ** ** $Id: expr.c,v 1.59 2002/05/15 08:30:13 danielk1977 Exp $ */ #include "sqliteInt.h" /* ** Construct a new expression node and return a pointer to it. Memory ** for this node is obtained from sqliteMalloc(). The calling function |
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477 478 479 480 481 482 483 484 485 486 487 488 489 490 | pExpr->iColumn = -1; }else{ pExpr->iColumn = j; } } } } if( cnt==0 && cntTab==1 && sqliteIsRowid(zRight) ){ cnt = 1; pExpr->iColumn = -1; } sqliteFree(zLeft); sqliteFree(zRight); if( cnt==0 ){ | > > > > > > > > > > > > > > > > > > > > > > > > > > > | 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 | pExpr->iColumn = -1; }else{ pExpr->iColumn = j; } } } } /* If we have not already resolved this *.* expression, then maybe * it is a new.* or old.* trigger argument reference */ if (cnt == 0 && pParse->trigStack != 0) { TriggerStack * tt = pParse->trigStack; int j; int t = 0; if (tt->newIdx != -1 && sqliteStrICmp("new", zLeft) == 0) { pExpr->iTable = tt->newIdx; cntTab++; t = 1; } if (tt->oldIdx != -1 && sqliteStrICmp("old", zLeft) == 0) { pExpr->iTable = tt->oldIdx; cntTab++; t = 1; } if (t) for(j=0; j<tt->pTab->nCol; j++) { if( sqliteStrICmp(tt->pTab->aCol[j].zName, zRight)==0 ){ cnt++; pExpr->iColumn = j; } } } if( cnt==0 && cntTab==1 && sqliteIsRowid(zRight) ){ cnt = 1; pExpr->iColumn = -1; } sqliteFree(zLeft); sqliteFree(zRight); if( cnt==0 ){ |
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Changes to src/insert.c.
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8 9 10 11 12 13 14 | ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** This file contains C code routines that are called by the parser ** to handle INSERT statements in SQLite. ** | | | 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** This file contains C code routines that are called by the parser ** to handle INSERT statements in SQLite. ** ** $Id: insert.c,v 1.53 2002/05/15 08:30:13 danielk1977 Exp $ */ #include "sqliteInt.h" /* ** This routine is call to handle SQL of the following forms: ** ** insert into TABLE (IDLIST) values(EXPRLIST) |
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36 37 38 39 40 41 42 | Token *pTableName, /* Name of table into which we are inserting */ ExprList *pList, /* List of values to be inserted */ Select *pSelect, /* A SELECT statement to use as the data source */ IdList *pColumn, /* Column names corresponding to IDLIST. */ int onError /* How to handle constraint errors */ ){ Table *pTab; /* The table to insert into */ | | > > > > > > > > > | > > > > > > > > > > > > > > > > > > < | > > > > | 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 | Token *pTableName, /* Name of table into which we are inserting */ ExprList *pList, /* List of values to be inserted */ Select *pSelect, /* A SELECT statement to use as the data source */ IdList *pColumn, /* Column names corresponding to IDLIST. */ int onError /* How to handle constraint errors */ ){ Table *pTab; /* The table to insert into */ char *zTab = 0; /* Name of the table into which we are inserting */ int i, j, idx; /* Loop counters */ Vdbe *v; /* Generate code into this virtual machine */ Index *pIdx; /* For looping over indices of the table */ int srcTab; /* Date comes from this temporary cursor if >=0 */ int nColumn; /* Number of columns in the data */ int base; /* First available cursor */ int iCont, iBreak; /* Beginning and end of the loop over srcTab */ sqlite *db; /* The main database structure */ int openOp; /* Opcode used to open cursors */ int keyColumn = -1; /* Column that is the INTEGER PRIMARY KEY */ int endOfLoop; /* Label for the end of the insertion loop */ int row_triggers_exist = 0; /* True if there are FOR EACH ROW triggers */ int newIdx = -1; if( pParse->nErr || sqlite_malloc_failed ) goto insert_cleanup; db = pParse->db; /* Locate the table into which we will be inserting new information. */ zTab = sqliteTableNameFromToken(pTableName); if( zTab==0 ) goto insert_cleanup; pTab = sqliteFindTable(pParse->db, zTab); if( pTab==0 ){ sqliteSetString(&pParse->zErrMsg, "no such table: ", zTab, 0); pParse->nErr++; goto insert_cleanup; } /* Ensure that: * (a) the table is not read-only, * (b) that if it is a view then ON INSERT triggers exist */ row_triggers_exist = sqliteTriggersExist(pParse, pTab->pTrigger, TK_INSERT, TK_BEFORE, TK_ROW, 0) || sqliteTriggersExist(pParse, pTab->pTrigger, TK_INSERT, TK_AFTER, TK_ROW, 0); if( pTab->readOnly || (pTab->pSelect && !row_triggers_exist) ){ sqliteSetString(&pParse->zErrMsg, pTab->pSelect ? "view " : "table ", zTab, " may not be modified", 0); pParse->nErr++; goto insert_cleanup; } sqliteFree(zTab); zTab = 0; if( pTab==0 ) goto insert_cleanup; /* Allocate a VDBE */ v = sqliteGetVdbe(pParse); if( v==0 ) goto insert_cleanup; if( pSelect || row_triggers_exist ){ sqliteBeginMultiWriteOperation(pParse); }else{ sqliteBeginWriteOperation(pParse); } /* if there are row triggers, allocate a temp table for new.* references. */ if (row_triggers_exist) newIdx = pParse->nTab++; /* Figure out how many columns of data are supplied. If the data ** is coming from a SELECT statement, then this step has to generate ** all the code to implement the SELECT statement and leave the data ** in a temporary table. If data is coming from an expression list, ** then we just have to count the number of expressions. */ |
︙ | ︙ | |||
169 170 171 172 173 174 175 | ** key, the set the keyColumn variable to the primary key column index ** in the original table definition. */ if( pColumn==0 ){ keyColumn = pTab->iPKey; } | | > > | > > > > > > > | | | | | | | | | | < < < < < > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | > > > > > > > > > > > > > > > > > | > > > | | | | > > | | > | 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 | ** key, the set the keyColumn variable to the primary key column index ** in the original table definition. */ if( pColumn==0 ){ keyColumn = pTab->iPKey; } /* Open the temp table for FOR EACH ROW triggers */ if (row_triggers_exist) sqliteVdbeAddOp(v, OP_OpenTemp, newIdx, 0); /* Initialize the count of rows to be inserted */ if( db->flags & SQLITE_CountRows && !pParse->trigStack){ sqliteVdbeAddOp(v, OP_Integer, 0, 0); /* Initialize the row count */ } /* Open tables and indices if there are no row triggers */ if (!row_triggers_exist) { base = pParse->nTab; openOp = pTab->isTemp ? OP_OpenWrAux : OP_OpenWrite; sqliteVdbeAddOp(v, openOp, base, pTab->tnum); sqliteVdbeChangeP3(v, -1, pTab->zName, P3_STATIC); for(idx=1, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, idx++){ sqliteVdbeAddOp(v, openOp, idx+base, pIdx->tnum); sqliteVdbeChangeP3(v, -1, pIdx->zName, P3_STATIC); } pParse->nTab += idx; } /* If the data source is a SELECT statement, then we have to create ** a loop because there might be multiple rows of data. If the data ** source is an expression list, then exactly one row will be inserted ** and the loop is not used. */ if( srcTab>=0 ){ iBreak = sqliteVdbeMakeLabel(v); sqliteVdbeAddOp(v, OP_Rewind, srcTab, iBreak); iCont = sqliteVdbeCurrentAddr(v); } if (row_triggers_exist) { /* build the new.* reference row */ sqliteVdbeAddOp(v, OP_Integer, 13, 0); for(i=0; i<pTab->nCol; i++){ if( pColumn==0 ){ j = i; }else{ for(j=0; j<pColumn->nId; j++){ if( pColumn->a[j].idx==i ) break; } } if( pColumn && j>=pColumn->nId ){ sqliteVdbeAddOp(v, OP_String, 0, 0); sqliteVdbeChangeP3(v, -1, pTab->aCol[i].zDflt, P3_STATIC); }else if( srcTab>=0 ){ sqliteVdbeAddOp(v, OP_Column, srcTab, j); }else{ sqliteExprCode(pParse, pList->a[j].pExpr); } } sqliteVdbeAddOp(v, OP_MakeRecord, pTab->nCol, 0); sqliteVdbeAddOp(v, OP_PutIntKey, newIdx, 0); sqliteVdbeAddOp(v, OP_Rewind, newIdx, 0); /* Fire BEFORE triggers */ if ( sqliteCodeRowTrigger(pParse, TK_INSERT, 0, TK_BEFORE, pTab, newIdx, -1, onError) ) goto insert_cleanup; /* Open the tables and indices for the INSERT */ if (!pTab->pSelect) { base = pParse->nTab; openOp = pTab->isTemp ? OP_OpenWrAux : OP_OpenWrite; sqliteVdbeAddOp(v, openOp, base, pTab->tnum); sqliteVdbeChangeP3(v, -1, pTab->zName, P3_STATIC); for(idx=1, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, idx++){ sqliteVdbeAddOp(v, openOp, idx+base, pIdx->tnum); sqliteVdbeChangeP3(v, -1, pIdx->zName, P3_STATIC); } pParse->nTab += idx; } } /* Push the record number for the new entry onto the stack. The ** record number is a randomly generate integer created by NewRecno ** except when the table has an INTEGER PRIMARY KEY column, in which ** case the record number is the same as that column. */ if (!pTab->pSelect) { if( keyColumn>=0 ){ if( srcTab>=0 ){ sqliteVdbeAddOp(v, OP_Column, srcTab, keyColumn); }else{ int addr; sqliteExprCode(pParse, pList->a[keyColumn].pExpr); /* If the PRIMARY KEY expression is NULL, then use OP_NewRecno ** to generate a unique primary key value. */ addr = sqliteVdbeAddOp(v, OP_Dup, 0, 1); sqliteVdbeAddOp(v, OP_NotNull, 0, addr+4); sqliteVdbeAddOp(v, OP_Pop, 1, 0); sqliteVdbeAddOp(v, OP_NewRecno, base, 0); } sqliteVdbeAddOp(v, OP_MustBeInt, 0, 0); }else{ sqliteVdbeAddOp(v, OP_NewRecno, base, 0); } /* Push onto the stack, data for all columns of the new entry, beginning ** with the first column. */ for(i=0; i<pTab->nCol; i++){ if( i==pTab->iPKey ){ /* The value of the INTEGER PRIMARY KEY column is always a NULL. ** Whenever this column is read, the record number will be substituted ** in its place. So will fill this column with a NULL to avoid ** taking up data space with information that will never be used. */ sqliteVdbeAddOp(v, OP_String, 0, 0); continue; } if( pColumn==0 ){ j = i; }else{ for(j=0; j<pColumn->nId; j++){ if( pColumn->a[j].idx==i ) break; } } if( pColumn && j>=pColumn->nId ){ sqliteVdbeAddOp(v, OP_String, 0, 0); sqliteVdbeChangeP3(v, -1, pTab->aCol[i].zDflt, P3_STATIC); }else if( srcTab>=0 ){ sqliteVdbeAddOp(v, OP_Column, srcTab, j); }else{ sqliteExprCode(pParse, pList->a[j].pExpr); } } /* Generate code to check constraints and generate index keys and ** do the insertion. */ endOfLoop = sqliteVdbeMakeLabel(v); sqliteGenerateConstraintChecks(pParse, pTab, base, 0,0,0,onError,endOfLoop); sqliteCompleteInsertion(pParse, pTab, base, 0,0,0); /* Update the count of rows that are inserted */ if( (db->flags & SQLITE_CountRows)!=0 && !pParse->trigStack){ sqliteVdbeAddOp(v, OP_AddImm, 1, 0); } } if (row_triggers_exist) { /* Close all tables opened */ if (!pTab->pSelect) { sqliteVdbeAddOp(v, OP_Close, base, 0); for(idx=1, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, idx++){ sqliteVdbeAddOp(v, OP_Close, idx+base, 0); } } /* Code AFTER triggers */ if ( sqliteCodeRowTrigger(pParse, TK_INSERT, 0, TK_AFTER, pTab, newIdx, -1, onError) ) goto insert_cleanup; } /* The bottom of the loop, if the data source is a SELECT statement */ sqliteVdbeResolveLabel(v, endOfLoop); if( srcTab>=0 ){ sqliteVdbeAddOp(v, OP_Next, srcTab, iCont); sqliteVdbeResolveLabel(v, iBreak); sqliteVdbeAddOp(v, OP_Close, srcTab, 0); } if (!row_triggers_exist) { /* Close all tables opened */ sqliteVdbeAddOp(v, OP_Close, base, 0); for(idx=1, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, idx++){ sqliteVdbeAddOp(v, OP_Close, idx+base, 0); } } sqliteEndWriteOperation(pParse); /* ** Return the number of rows inserted. */ if( db->flags & SQLITE_CountRows && !pParse->trigStack ){ sqliteVdbeAddOp(v, OP_ColumnCount, 1, 0); sqliteVdbeAddOp(v, OP_ColumnName, 0, 0); sqliteVdbeChangeP3(v, -1, "rows inserted", P3_STATIC); sqliteVdbeAddOp(v, OP_Callback, 1, 0); } insert_cleanup: if( pList ) sqliteExprListDelete(pList); if( pSelect ) sqliteSelectDelete(pSelect); if ( zTab ) sqliteFree(zTab); sqliteIdListDelete(pColumn); } /* ** Generate code to do a constraint check prior to an INSERT or an UPDATE. ** ** When this routine is called, the stack contains (from bottom to top) |
︙ | ︙ | |||
569 570 571 572 573 574 575 | assert( pTab->pSelect==0 ); /* This table is not a VIEW */ for(nIdx=0, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, nIdx++){} for(i=nIdx-1; i>=0; i--){ if( aIdxUsed && aIdxUsed[i]==0 ) continue; sqliteVdbeAddOp(v, OP_IdxPut, base+i+1, 0); } sqliteVdbeAddOp(v, OP_MakeRecord, pTab->nCol, 0); | | | 672 673 674 675 676 677 678 679 680 681 682 683 | assert( pTab->pSelect==0 ); /* This table is not a VIEW */ for(nIdx=0, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, nIdx++){} for(i=nIdx-1; i>=0; i--){ if( aIdxUsed && aIdxUsed[i]==0 ) continue; sqliteVdbeAddOp(v, OP_IdxPut, base+i+1, 0); } sqliteVdbeAddOp(v, OP_MakeRecord, pTab->nCol, 0); sqliteVdbeAddOp(v, OP_PutIntKey, base, pParse->trigStack?0:1); if( isUpdate && recnoChng ){ sqliteVdbeAddOp(v, OP_Pop, 1, 0); } } |
Changes to src/main.c.
︙ | ︙ | |||
10 11 12 13 14 15 16 | ** ************************************************************************* ** Main file for the SQLite library. The routines in this file ** implement the programmer interface to the library. Routines in ** other files are for internal use by SQLite and should not be ** accessed by users of the library. ** | | | 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 | ** ************************************************************************* ** Main file for the SQLite library. The routines in this file ** implement the programmer interface to the library. Routines in ** other files are for internal use by SQLite and should not be ** accessed by users of the library. ** ** $Id: main.c,v 1.72 2002/05/15 08:30:13 danielk1977 Exp $ */ #include "sqliteInt.h" #include "os.h" /* ** This is the callback routine for the code that initializes the ** database. See sqliteInit() below for additional information. |
︙ | ︙ | |||
322 323 324 325 326 327 328 329 330 331 332 333 334 335 | /* Allocate the sqlite data structure */ db = sqliteMalloc( sizeof(sqlite) ); if( pzErrMsg ) *pzErrMsg = 0; if( db==0 ) goto no_mem_on_open; sqliteHashInit(&db->tblHash, SQLITE_HASH_STRING, 0); sqliteHashInit(&db->idxHash, SQLITE_HASH_STRING, 0); sqliteHashInit(&db->tblDrop, SQLITE_HASH_POINTER, 0); sqliteHashInit(&db->idxDrop, SQLITE_HASH_POINTER, 0); sqliteHashInit(&db->aFunc, SQLITE_HASH_STRING, 1); sqliteRegisterBuildinFunctions(db); db->onError = OE_Default; db->priorNewRowid = 0; db->magic = SQLITE_MAGIC_BUSY; | > > | 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 | /* Allocate the sqlite data structure */ db = sqliteMalloc( sizeof(sqlite) ); if( pzErrMsg ) *pzErrMsg = 0; if( db==0 ) goto no_mem_on_open; sqliteHashInit(&db->tblHash, SQLITE_HASH_STRING, 0); sqliteHashInit(&db->idxHash, SQLITE_HASH_STRING, 0); sqliteHashInit(&db->trigHash, SQLITE_HASH_STRING, 0); sqliteHashInit(&db->trigDrop, SQLITE_HASH_STRING, 0); sqliteHashInit(&db->tblDrop, SQLITE_HASH_POINTER, 0); sqliteHashInit(&db->idxDrop, SQLITE_HASH_POINTER, 0); sqliteHashInit(&db->aFunc, SQLITE_HASH_STRING, 1); sqliteRegisterBuildinFunctions(db); db->onError = OE_Default; db->priorNewRowid = 0; db->magic = SQLITE_MAGIC_BUSY; |
︙ | ︙ | |||
379 380 381 382 383 384 385 386 387 388 | ** This routine erases the stored schema. This erasure occurs because ** either the database is being closed or because some other process ** changed the schema and this process needs to reread it. */ static void clearHashTable(sqlite *db, int preserveTemps){ HashElem *pElem; Hash temp1; assert( sqliteHashFirst(&db->tblDrop)==0 ); /* There can not be uncommitted */ assert( sqliteHashFirst(&db->idxDrop)==0 ); /* DROP TABLEs or DROP INDEXs */ temp1 = db->tblHash; | > > | > > > > > > > > > > > > > > > > | 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 | ** This routine erases the stored schema. This erasure occurs because ** either the database is being closed or because some other process ** changed the schema and this process needs to reread it. */ static void clearHashTable(sqlite *db, int preserveTemps){ HashElem *pElem; Hash temp1; Hash temp2; assert( sqliteHashFirst(&db->tblDrop)==0 ); /* There can not be uncommitted */ assert( sqliteHashFirst(&db->idxDrop)==0 ); /* DROP TABLEs or DROP INDEXs */ temp1 = db->tblHash; temp2 = db->trigHash; sqliteHashInit(&db->trigHash, SQLITE_HASH_STRING, 0); sqliteHashClear(&db->idxHash); for (pElem=sqliteHashFirst(&temp2); pElem; pElem=sqliteHashNext(pElem)){ Trigger * pTrigger = sqliteHashData(pElem); Table *pTab = sqliteFindTable(db, pTrigger->table); assert(pTab); if (pTab->isTemp) { sqliteHashInsert(&db->trigHash, pTrigger->name, strlen(pTrigger->name), pTrigger); } else { sqliteDeleteTrigger(pTrigger); } } sqliteHashClear(&temp2); sqliteHashInit(&db->tblHash, SQLITE_HASH_STRING, 0); for(pElem=sqliteHashFirst(&temp1); pElem; pElem=sqliteHashNext(pElem)){ Table *pTab = sqliteHashData(pElem); if( preserveTemps && pTab->isTemp ){ Index *pIdx; int nName = strlen(pTab->zName); Table *pOld = sqliteHashInsert(&db->tblHash, pTab->zName, nName+1, pTab); if( pOld!=0 ){ |
︙ | ︙ | |||
409 410 411 412 413 414 415 416 417 418 419 420 421 422 | } } }else{ sqliteDeleteTable(db, pTab); } } sqliteHashClear(&temp1); db->flags &= ~SQLITE_Initialized; } /* ** Return the ROWID of the most recent insert */ int sqlite_last_insert_rowid(sqlite *db){ | > | 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 | } } }else{ sqliteDeleteTable(db, pTab); } } sqliteHashClear(&temp1); db->flags &= ~SQLITE_Initialized; } /* ** Return the ROWID of the most recent insert */ int sqlite_last_insert_rowid(sqlite *db){ |
︙ | ︙ | |||
454 455 456 457 458 459 460 461 462 463 464 465 466 467 | } /* ** Return TRUE if the given SQL string ends in a semicolon. */ int sqlite_complete(const char *zSql){ int isComplete = 0; while( *zSql ){ switch( *zSql ){ case ';': { isComplete = 1; break; } case ' ': | > | 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 | } /* ** Return TRUE if the given SQL string ends in a semicolon. */ int sqlite_complete(const char *zSql){ int isComplete = 0; int seenCreate = 0; while( *zSql ){ switch( *zSql ){ case ';': { isComplete = 1; break; } case ' ': |
︙ | ︙ | |||
497 498 499 500 501 502 503 504 505 506 507 508 509 510 | break; } while( *zSql && *zSql!='\n' ){ zSql++; } if( *zSql==0 ) return isComplete; break; } default: { isComplete = 0; break; } } zSql++; } return isComplete; | > > > > > > > > > > | 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 | break; } while( *zSql && *zSql!='\n' ){ zSql++; } if( *zSql==0 ) return isComplete; break; } default: { if (seenCreate && !sqliteStrNICmp(zSql, "trigger", 7)) while (sqliteStrNICmp(zSql, "end", 3)) if (!*++zSql) return 0; if (!sqliteStrNICmp(zSql, "create", 6)) { zSql = zSql + 5; seenCreate = 1; } else seenCreate = 0; isComplete = 0; break; } } zSql++; } return isComplete; |
︙ | ︙ |
Changes to src/parse.y.
︙ | ︙ | |||
10 11 12 13 14 15 16 | ** ************************************************************************* ** This file contains SQLite's grammar for SQL. Process this file ** using the lemon parser generator to generate C code that runs ** the parser. Lemon will also generate a header file containing ** numeric codes for all of the tokens. ** | | > > > > > | 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 | ** ************************************************************************* ** This file contains SQLite's grammar for SQL. Process this file ** using the lemon parser generator to generate C code that runs ** the parser. Lemon will also generate a header file containing ** numeric codes for all of the tokens. ** ** @(#) $Id: parse.y,v 1.64 2002/05/15 08:30:14 danielk1977 Exp $ */ %token_prefix TK_ %token_type {Token} %default_type {Token} %extra_argument {Parse *pParse} %syntax_error { sqliteSetString(&pParse->zErrMsg,"syntax error",0); pParse->sErrToken = TOKEN; } %name sqliteParser %include { #include "sqliteInt.h" #include "parse.h" /* ** A structure for holding two integers */ struct twoint { int a,b; }; /* ** A structure for holding an integer and an IdList */ struct int_idlist { int a; IdList * b; }; } // These are extra tokens used by the lexer but never seen by the // parser. We put them in a rule so that the parser generator will // add them to the parse.h output file. // %nonassoc END_OF_FILE ILLEGAL SPACE UNCLOSED_STRING COMMENT FUNCTION |
︙ | ︙ | |||
624 625 626 627 628 629 630 | cmd ::= PRAGMA ids(X). {sqlitePragma(pParse,&X,&X,0);} plus_num(A) ::= plus_opt number(X). {A = X;} minus_num(A) ::= MINUS number(X). {A = X;} number(A) ::= INTEGER(X). {A = X;} number(A) ::= FLOAT(X). {A = X;} plus_opt ::= PLUS. plus_opt ::= . | > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > | 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 | cmd ::= PRAGMA ids(X). {sqlitePragma(pParse,&X,&X,0);} plus_num(A) ::= plus_opt number(X). {A = X;} minus_num(A) ::= MINUS number(X). {A = X;} number(A) ::= INTEGER(X). {A = X;} number(A) ::= FLOAT(X). {A = X;} plus_opt ::= PLUS. plus_opt ::= . //////////////////////////// The CREATE TRIGGER command ///////////////////// cmd ::= CREATE(A) TRIGGER ids(B) trigger_time(C) trigger_event(D) ON ids(E) foreach_clause(F) when_clause(G) BEGIN trigger_cmd_list(S) END(Z). { sqliteCreateTrigger(pParse, &B, C, D.a, D.b, &E, F, G, S, A.z, (int)(Z.z - A.z) + Z.n ); } %type trigger_time {int} trigger_time(A) ::= BEFORE. { A = TK_BEFORE; } trigger_time(A) ::= AFTER. { A = TK_AFTER; } trigger_time(A) ::= INSTEAD OF. { A = TK_INSTEAD;} trigger_time(A) ::= . { A = TK_BEFORE; } %type trigger_event {struct int_idlist} trigger_event(A) ::= DELETE. { A.a = TK_DELETE; A.b = 0; } trigger_event(A) ::= INSERT. { A.a = TK_INSERT; A.b = 0; } trigger_event(A) ::= UPDATE. { A.a = TK_UPDATE; A.b = 0;} trigger_event(A) ::= UPDATE OF inscollist(X). {A.a = TK_UPDATE; A.b = X; } %type foreach_clause {int} foreach_clause(A) ::= . { A = TK_ROW; } foreach_clause(A) ::= FOR EACH ROW. { A = TK_ROW; } foreach_clause(A) ::= FOR EACH STATEMENT. { A = TK_STATEMENT; } %type when_clause {Expr *} when_clause(A) ::= . { A = 0; } when_clause(A) ::= WHEN expr(X). { A = X; } %type trigger_cmd_list {TriggerStep *} trigger_cmd_list(A) ::= trigger_cmd(X) SEMI trigger_cmd_list(Y). { X->pNext = Y ; A = X; } trigger_cmd_list(A) ::= . { A = 0; } %type trigger_cmd {TriggerStep *} // UPDATE trigger_cmd(A) ::= UPDATE orconf(R) ids(X) SET setlist(Y) where_opt(Z). { A = sqliteTriggerUpdateStep(&X, Y, Z, R); } // INSERT trigger_cmd(A) ::= INSERT orconf(R) INTO ids(X) inscollist_opt(F) VALUES LP itemlist(Y) RP. {A = sqliteTriggerInsertStep(&X, F, Y, 0, R);} trigger_cmd(A) ::= INSERT orconf(R) INTO ids(X) inscollist_opt(F) select(S). {A = sqliteTriggerInsertStep(&X, F, 0, S, R);} // DELETE trigger_cmd(A) ::= DELETE FROM ids(X) where_opt(Y). {A = sqliteTriggerDeleteStep(&X, Y);} // SELECT trigger_cmd(A) ::= select(X). {A = sqliteTriggerSelectStep(X); } //////////////////////// DROP TRIGGER statement ////////////////////////////// cmd ::= DROP TRIGGER ids(X). { sqliteDropTrigger(pParse,&X,0); } |
Changes to src/sqliteInt.h.
1 2 3 4 5 6 7 8 9 10 11 12 13 | /* ** 2001 September 15 ** ** The author disclaims copyright to this source code. In place of ** a legal notice, here is a blessing: ** ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** Internal interface definitions for SQLite. ** | | | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 | /* ** 2001 September 15 ** ** The author disclaims copyright to this source code. In place of ** a legal notice, here is a blessing: ** ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** Internal interface definitions for SQLite. ** ** @(#) $Id: sqliteInt.h,v 1.108 2002/05/15 08:30:14 danielk1977 Exp $ */ #include "sqlite.h" #include "hash.h" #include "vdbe.h" #include "parse.h" #include "btree.h" #include <stdio.h> |
︙ | ︙ | |||
140 141 142 143 144 145 146 147 148 149 150 151 152 153 | typedef struct Token Token; typedef struct IdList IdList; typedef struct WhereInfo WhereInfo; typedef struct WhereLevel WhereLevel; typedef struct Select Select; typedef struct AggExpr AggExpr; typedef struct FuncDef FuncDef; /* ** Each database is an instance of the following structure */ struct sqlite { Btree *pBe; /* The B*Tree backend */ Btree *pBeTemp; /* Backend for session temporary tables */ | > > > | 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 | typedef struct Token Token; typedef struct IdList IdList; typedef struct WhereInfo WhereInfo; typedef struct WhereLevel WhereLevel; typedef struct Select Select; typedef struct AggExpr AggExpr; typedef struct FuncDef FuncDef; typedef struct Trigger Trigger; typedef struct TriggerStep TriggerStep; typedef struct TriggerStack TriggerStack; /* ** Each database is an instance of the following structure */ struct sqlite { Btree *pBe; /* The B*Tree backend */ Btree *pBeTemp; /* Backend for session temporary tables */ |
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166 167 168 169 170 171 172 173 174 175 176 177 178 179 | Hash aFunc; /* All functions that can be in SQL exprs */ int lastRowid; /* ROWID of most recent insert */ int priorNewRowid; /* Last randomly generated ROWID */ int onError; /* Default conflict algorithm */ int magic; /* Magic number for detect library misuse */ int nChange; /* Number of rows changed */ int recursionDepth; /* Number of nested calls to sqlite_exec() */ }; /* ** Possible values for the sqlite.flags. */ #define SQLITE_VdbeTrace 0x00000001 /* True to trace VDBE execution */ #define SQLITE_Initialized 0x00000002 /* True after initialization */ | > > > | 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 | Hash aFunc; /* All functions that can be in SQL exprs */ int lastRowid; /* ROWID of most recent insert */ int priorNewRowid; /* Last randomly generated ROWID */ int onError; /* Default conflict algorithm */ int magic; /* Magic number for detect library misuse */ int nChange; /* Number of rows changed */ int recursionDepth; /* Number of nested calls to sqlite_exec() */ Hash trigHash; /* All triggers indexed by name */ Hash trigDrop; /* Uncommited dropped triggers */ }; /* ** Possible values for the sqlite.flags. */ #define SQLITE_VdbeTrace 0x00000001 /* True to trace VDBE execution */ #define SQLITE_Initialized 0x00000002 /* True after initialization */ |
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266 267 268 269 270 271 272 273 274 275 276 277 278 279 | Select *pSelect; /* NULL for tables. Points to definition if a view. */ u8 readOnly; /* True if this table should not be written by the user */ u8 isCommit; /* True if creation of this table has been committed */ u8 isTemp; /* True if stored in db->pBeTemp instead of db->pBe */ u8 isTransient; /* True if automatically deleted when VDBE finishes */ u8 hasPrimKey; /* True if there exists a primary key */ u8 keyConf; /* What to do in case of uniqueness conflict on iPKey */ }; /* ** SQLite supports 5 different ways to resolve a contraint ** error. ROLLBACK processing means that a constraint violation ** causes the operation in proces to fail and for the current transaction ** to be rolled back. ABORT processing means the operation in process | > > | 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 | Select *pSelect; /* NULL for tables. Points to definition if a view. */ u8 readOnly; /* True if this table should not be written by the user */ u8 isCommit; /* True if creation of this table has been committed */ u8 isTemp; /* True if stored in db->pBeTemp instead of db->pBe */ u8 isTransient; /* True if automatically deleted when VDBE finishes */ u8 hasPrimKey; /* True if there exists a primary key */ u8 keyConf; /* What to do in case of uniqueness conflict on iPKey */ Trigger *pTrigger; /* List of SQL triggers on this table */ }; /* ** SQLite supports 5 different ways to resolve a contraint ** error. ROLLBACK processing means that a constraint violation ** causes the operation in proces to fail and for the current transaction ** to be rolled back. ABORT processing means the operation in process |
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546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 | int nSet; /* Number of sets used so far */ int nAgg; /* Number of aggregate expressions */ AggExpr *aAgg; /* An array of aggregate expressions */ int useAgg; /* If true, extract field values from the aggregator ** while generating expressions. Normally false */ int schemaVerified; /* True if an OP_VerifySchema has been coded someplace ** other than after an OP_Transaction */ }; /* ** Internal function prototypes */ int sqliteStrICmp(const char *, const char *); int sqliteStrNICmp(const char *, const char *, int); int sqliteHashNoCase(const char *, int); int sqliteCompare(const char *, const char *); | > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > | 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 | int nSet; /* Number of sets used so far */ int nAgg; /* Number of aggregate expressions */ AggExpr *aAgg; /* An array of aggregate expressions */ int useAgg; /* If true, extract field values from the aggregator ** while generating expressions. Normally false */ int schemaVerified; /* True if an OP_VerifySchema has been coded someplace ** other than after an OP_Transaction */ TriggerStack * trigStack; }; struct TriggerStack { Trigger * pTrigger; Table * pTab; /* Table that triggers are currently being coded as */ int newIdx; /* Index of "new" temp table */ int oldIdx; /* Index of "old" temp table */ int orconf; /* Current orconf policy */ struct TriggerStack * pNext; }; struct TriggerStep { int op; /* One of TK_DELETE, TK_UPDATE, TK_INSERT, TK_SELECT */ int orconf; Select * pSelect; /* Valid for SELECT and sometimes INSERT steps (when pExprList == 0) */ Token target; /* Valid for DELETE, UPDATE, INSERT steps */ Expr * pWhere; /* Valid for DELETE, UPDATE steps */ ExprList * pExprList; /* Valid for UPDATE statements and sometimes INSERT steps (when pSelect == 0) */ IdList *pIdList; /* Valid for INSERT statements only */ TriggerStep * pNext; /* Next in the link-list */ }; struct Trigger { char * name; /* The name of the trigger */ char * table; /* The table or view to which the trigger applies */ int op; /* One of TK_DELETE, TK_UPDATE, TK_INSERT */ int tr_tm; /* One of TK_BEFORE, TK_AFTER, TK_INSTEAD */ Expr * pWhen; /* The WHEN clause of the expresion (may be NULL) */ IdList * pColumns; /* If this is an UPDATE OF <column-list> trigger, the column names are stored in this list */ int foreach; /* One of TK_ROW or TK_STATEMENT */ TriggerStep * step_list; /* Link list of trigger program steps */ char * strings; /* pointer to the allocation of Token strings */ Trigger * pNext; /* Next trigger associated with the table */ int isCommit; }; TriggerStep * sqliteTriggerSelectStep(Select *); TriggerStep * sqliteTriggerInsertStep(Token *, IdList *, ExprList *, Select *, int); TriggerStep * sqliteTriggerUpdateStep(Token *, ExprList *, Expr *, int); TriggerStep * sqliteTriggerDeleteStep(Token *, Expr *); extern int always_code_trigger_setup; void sqliteCreateTrigger(Parse * ,Token *, int, int, IdList *, Token *, int, Expr *, TriggerStep *, char const *,int); void sqliteDropTrigger(Parse *, Token *, int); int sqliteTriggersExist( Parse * , Trigger * , int , int , int, ExprList * ); int sqliteCodeRowTrigger( Parse * pParse, int op, ExprList *, int tr_tm, Table * tbl, int newTable, int oldTable, int onError); void sqliteViewTriggers(Parse *, Table *, Expr *, int, ExprList *); /* ** Internal function prototypes */ int sqliteStrICmp(const char *, const char *); int sqliteStrNICmp(const char *, const char *, int); int sqliteHashNoCase(const char *, int); int sqliteCompare(const char *, const char *); |
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658 659 660 661 662 663 664 | IdList *sqliteIdListDup(IdList*); Select *sqliteSelectDup(Select*); FuncDef *sqliteFindFunction(sqlite*,const char*,int,int,int); void sqliteRegisterBuildinFunctions(sqlite*); int sqliteSafetyOn(sqlite*); int sqliteSafetyOff(sqlite*); int sqliteSafetyCheck(sqlite*); | > > | 722 723 724 725 726 727 728 729 730 | IdList *sqliteIdListDup(IdList*); Select *sqliteSelectDup(Select*); FuncDef *sqliteFindFunction(sqlite*,const char*,int,int,int); void sqliteRegisterBuildinFunctions(sqlite*); int sqliteSafetyOn(sqlite*); int sqliteSafetyOff(sqlite*); int sqliteSafetyCheck(sqlite*); void changeCookie(sqlite *); |
Changes to src/tokenize.c.
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11 12 13 14 15 16 17 | ************************************************************************* ** An tokenizer for SQL ** ** This file contains C code that splits an SQL input string up into ** individual tokens and sends those tokens one-by-one over to the ** parser for analysis. ** | | | 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 | ************************************************************************* ** An tokenizer for SQL ** ** This file contains C code that splits an SQL input string up into ** individual tokens and sends those tokens one-by-one over to the ** parser for analysis. ** ** $Id: tokenize.c,v 1.41 2002/05/15 08:30:14 danielk1977 Exp $ */ #include "sqliteInt.h" #include "os.h" #include <ctype.h> #include <stdlib.h> /* |
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35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 | }; /* ** These are the keywords */ static Keyword aKeywordTable[] = { { "ABORT", 0, TK_ABORT, 0 }, { "ALL", 0, TK_ALL, 0 }, { "AND", 0, TK_AND, 0 }, { "AS", 0, TK_AS, 0 }, { "ASC", 0, TK_ASC, 0 }, { "BEGIN", 0, TK_BEGIN, 0 }, { "BETWEEN", 0, TK_BETWEEN, 0 }, { "BY", 0, TK_BY, 0 }, { "CASE", 0, TK_CASE, 0 }, { "CHECK", 0, TK_CHECK, 0 }, { "CLUSTER", 0, TK_CLUSTER, 0 }, { "COMMIT", 0, TK_COMMIT, 0 }, { "CONFLICT", 0, TK_CONFLICT, 0 }, { "CONSTRAINT", 0, TK_CONSTRAINT, 0 }, { "COPY", 0, TK_COPY, 0 }, { "CREATE", 0, TK_CREATE, 0 }, { "DEFAULT", 0, TK_DEFAULT, 0 }, { "DELETE", 0, TK_DELETE, 0 }, { "DELIMITERS", 0, TK_DELIMITERS, 0 }, { "DESC", 0, TK_DESC, 0 }, { "DISTINCT", 0, TK_DISTINCT, 0 }, { "DROP", 0, TK_DROP, 0 }, { "END", 0, TK_END, 0 }, { "ELSE", 0, TK_ELSE, 0 }, { "EXCEPT", 0, TK_EXCEPT, 0 }, { "EXPLAIN", 0, TK_EXPLAIN, 0 }, { "FAIL", 0, TK_FAIL, 0 }, { "FROM", 0, TK_FROM, 0 }, { "GLOB", 0, TK_GLOB, 0 }, { "GROUP", 0, TK_GROUP, 0 }, { "HAVING", 0, TK_HAVING, 0 }, { "IGNORE", 0, TK_IGNORE, 0 }, { "IN", 0, TK_IN, 0 }, { "INDEX", 0, TK_INDEX, 0 }, { "INSERT", 0, TK_INSERT, 0 }, { "INTERSECT", 0, TK_INTERSECT, 0 }, { "INTO", 0, TK_INTO, 0 }, { "IS", 0, TK_IS, 0 }, { "ISNULL", 0, TK_ISNULL, 0 }, { "KEY", 0, TK_KEY, 0 }, { "LIKE", 0, TK_LIKE, 0 }, { "LIMIT", 0, TK_LIMIT, 0 }, { "NOT", 0, TK_NOT, 0 }, { "NOTNULL", 0, TK_NOTNULL, 0 }, { "NULL", 0, TK_NULL, 0 }, { "OFFSET", 0, TK_OFFSET, 0 }, { "ON", 0, TK_ON, 0 }, { "OR", 0, TK_OR, 0 }, { "ORDER", 0, TK_ORDER, 0 }, { "PRAGMA", 0, TK_PRAGMA, 0 }, { "PRIMARY", 0, TK_PRIMARY, 0 }, { "REPLACE", 0, TK_REPLACE, 0 }, { "ROLLBACK", 0, TK_ROLLBACK, 0 }, { "SELECT", 0, TK_SELECT, 0 }, { "SET", 0, TK_SET, 0 }, { "TABLE", 0, TK_TABLE, 0 }, { "TEMP", 0, TK_TEMP, 0 }, { "TEMPORARY", 0, TK_TEMP, 0 }, { "THEN", 0, TK_THEN, 0 }, { "TRANSACTION", 0, TK_TRANSACTION, 0 }, { "UNION", 0, TK_UNION, 0 }, { "UNIQUE", 0, TK_UNIQUE, 0 }, { "UPDATE", 0, TK_UPDATE, 0 }, { "USING", 0, TK_USING, 0 }, { "VACUUM", 0, TK_VACUUM, 0 }, { "VALUES", 0, TK_VALUES, 0 }, { "VIEW", 0, TK_VIEW, 0 }, | > > > > > > > > | 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 | }; /* ** These are the keywords */ static Keyword aKeywordTable[] = { { "ABORT", 0, TK_ABORT, 0 }, { "AFTER", 0, TK_AFTER, 0 }, { "ALL", 0, TK_ALL, 0 }, { "AND", 0, TK_AND, 0 }, { "AS", 0, TK_AS, 0 }, { "ASC", 0, TK_ASC, 0 }, { "BEFORE", 0, TK_BEFORE, 0 }, { "BEGIN", 0, TK_BEGIN, 0 }, { "BETWEEN", 0, TK_BETWEEN, 0 }, { "BY", 0, TK_BY, 0 }, { "CASE", 0, TK_CASE, 0 }, { "CHECK", 0, TK_CHECK, 0 }, { "CLUSTER", 0, TK_CLUSTER, 0 }, { "COMMIT", 0, TK_COMMIT, 0 }, { "CONFLICT", 0, TK_CONFLICT, 0 }, { "CONSTRAINT", 0, TK_CONSTRAINT, 0 }, { "COPY", 0, TK_COPY, 0 }, { "CREATE", 0, TK_CREATE, 0 }, { "DEFAULT", 0, TK_DEFAULT, 0 }, { "DELETE", 0, TK_DELETE, 0 }, { "DELIMITERS", 0, TK_DELIMITERS, 0 }, { "DESC", 0, TK_DESC, 0 }, { "DISTINCT", 0, TK_DISTINCT, 0 }, { "DROP", 0, TK_DROP, 0 }, { "END", 0, TK_END, 0 }, { "EACH", 0, TK_EACH, 0 }, { "ELSE", 0, TK_ELSE, 0 }, { "EXCEPT", 0, TK_EXCEPT, 0 }, { "EXPLAIN", 0, TK_EXPLAIN, 0 }, { "FAIL", 0, TK_FAIL, 0 }, { "FOR", 0, TK_FOR, 0 }, { "FROM", 0, TK_FROM, 0 }, { "GLOB", 0, TK_GLOB, 0 }, { "GROUP", 0, TK_GROUP, 0 }, { "HAVING", 0, TK_HAVING, 0 }, { "IGNORE", 0, TK_IGNORE, 0 }, { "IN", 0, TK_IN, 0 }, { "INDEX", 0, TK_INDEX, 0 }, { "INSERT", 0, TK_INSERT, 0 }, { "INSTEAD", 0, TK_INSTEAD, 0 }, { "INTERSECT", 0, TK_INTERSECT, 0 }, { "INTO", 0, TK_INTO, 0 }, { "IS", 0, TK_IS, 0 }, { "ISNULL", 0, TK_ISNULL, 0 }, { "KEY", 0, TK_KEY, 0 }, { "LIKE", 0, TK_LIKE, 0 }, { "LIMIT", 0, TK_LIMIT, 0 }, { "NOT", 0, TK_NOT, 0 }, { "NOTNULL", 0, TK_NOTNULL, 0 }, { "NULL", 0, TK_NULL, 0 }, { "OF", 0, TK_OF, 0 }, { "OFFSET", 0, TK_OFFSET, 0 }, { "ON", 0, TK_ON, 0 }, { "OR", 0, TK_OR, 0 }, { "ORDER", 0, TK_ORDER, 0 }, { "PRAGMA", 0, TK_PRAGMA, 0 }, { "PRIMARY", 0, TK_PRIMARY, 0 }, { "REPLACE", 0, TK_REPLACE, 0 }, { "ROLLBACK", 0, TK_ROLLBACK, 0 }, { "ROW", 0, TK_ROW, 0 }, { "SELECT", 0, TK_SELECT, 0 }, { "SET", 0, TK_SET, 0 }, { "TABLE", 0, TK_TABLE, 0 }, { "TEMP", 0, TK_TEMP, 0 }, { "TEMPORARY", 0, TK_TEMP, 0 }, { "THEN", 0, TK_THEN, 0 }, { "TRANSACTION", 0, TK_TRANSACTION, 0 }, { "TRIGGER", 0, TK_TRIGGER, 0 }, { "UNION", 0, TK_UNION, 0 }, { "UNIQUE", 0, TK_UNIQUE, 0 }, { "UPDATE", 0, TK_UPDATE, 0 }, { "USING", 0, TK_USING, 0 }, { "VACUUM", 0, TK_VACUUM, 0 }, { "VALUES", 0, TK_VALUES, 0 }, { "VIEW", 0, TK_VIEW, 0 }, |
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Added src/trigger.c.
> > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 | /* * All copyright on this work is disclaimed by the author. * */ #include "sqliteInt.h" /* * This is called by the parser when it sees a CREATE TRIGGER statement */ void sqliteCreateTrigger( Parse * pParse, /* The parse context of the CREATE TRIGGER statement */ Token * nm, /* The name of the trigger */ int tr_tm, /* One of TK_BEFORE, TK_AFTER */ int op, /* One of TK_INSERT, TK_UPDATE, TK_DELETE */ IdList * cols, /* column list if this is an UPDATE OF trigger */ Token * tbl, /* The name of the table/view the trigger applies to */ int foreach, /* One of TK_ROW or TK_STATEMENT */ Expr * pWhen, /* WHEN clause */ TriggerStep * steps, /* The triggered program */ char const * cc, int len) /* The string data to make persistent */ { Trigger * nt; Table * tab; int offset; TriggerStep * ss; /* Check that: 1. the trigger name does not already exist. 2. the table (or view) does exist. */ { char * tmp_str = sqliteStrNDup(nm->z, nm->n); if (sqliteHashFind(&(pParse->db->trigHash), tmp_str, nm->n + 1)) { sqliteSetNString(&pParse->zErrMsg, "trigger ", -1, nm->z, nm->n, " already exists", -1, 0); sqliteFree(tmp_str); pParse->nErr++; goto trigger_cleanup; } sqliteFree(tmp_str); } { char * tmp_str = sqliteStrNDup(tbl->z, tbl->n); tab = sqliteFindTable(pParse->db, tmp_str); sqliteFree(tmp_str); if (!tab) { sqliteSetNString(&pParse->zErrMsg, "no such table: ", -1, tbl->z, tbl->n, 0); pParse->nErr++; goto trigger_cleanup; } } /* Build the Trigger object */ nt = (Trigger *)sqliteMalloc(sizeof(Trigger)); nt->name = sqliteStrNDup(nm->z, nm->n); nt->table = sqliteStrNDup(tbl->z, tbl->n); nt->op = op; nt->tr_tm = tr_tm; nt->pWhen = pWhen; nt->pColumns = cols; nt->foreach = foreach; nt->step_list = steps; nt->isCommit = 0; nt->strings = sqliteStrNDup(cc, len); offset = (int)(nt->strings - cc); sqliteExprMoveStrings(nt->pWhen, offset); ss = nt->step_list; while (ss) { sqliteSelectMoveStrings(ss->pSelect, offset); if (ss->target.z) ss->target.z += offset; sqliteExprMoveStrings(ss->pWhere, offset); sqliteExprListMoveStrings(ss->pExprList, offset); ss = ss->pNext; } /* if we are not initializing, and this trigger is not on a TEMP table, build the sqlite_master entry */ if (!pParse->initFlag && !tab->isTemp) { /* Make an entry in the sqlite_master table */ sqliteBeginWriteOperation(pParse); sqliteVdbeAddOp(pParse->pVdbe, OP_OpenWrite, 0, 2); sqliteVdbeChangeP3(pParse->pVdbe, -1, MASTER_NAME, P3_STATIC); sqliteVdbeAddOp(pParse->pVdbe, OP_NewRecno, 0, 0); sqliteVdbeAddOp(pParse->pVdbe, OP_String, 0, 0); sqliteVdbeChangeP3(pParse->pVdbe, -1, "trigger", P3_STATIC); sqliteVdbeAddOp(pParse->pVdbe, OP_String, 0, 0); sqliteVdbeChangeP3(pParse->pVdbe, -1, nt->name, 0); sqliteVdbeAddOp(pParse->pVdbe, OP_String, 0, 0); sqliteVdbeChangeP3(pParse->pVdbe, -1, nt->table, 0); sqliteVdbeAddOp(pParse->pVdbe, OP_Integer, 0, 0); sqliteVdbeAddOp(pParse->pVdbe, OP_String, 0, 0); sqliteVdbeChangeP3(pParse->pVdbe, -1, nt->strings, 0); sqliteVdbeAddOp(pParse->pVdbe, OP_MakeRecord, 5, 0); sqliteVdbeAddOp(pParse->pVdbe, OP_PutIntKey, 0, 1); /* Change the cookie, since the schema is changed */ changeCookie(pParse->db); sqliteVdbeAddOp(pParse->pVdbe, OP_Integer, pParse->db->next_cookie, 0); sqliteVdbeAddOp(pParse->pVdbe, OP_SetCookie, 0, 0); sqliteVdbeAddOp(pParse->pVdbe, OP_Close, 0, 0); sqliteEndWriteOperation(pParse); } if (!pParse->explain) { /* Stick it in the hash-table */ sqliteHashInsert(&(pParse->db->trigHash), nt->name, nm->n + 1, nt); /* Attach it to the table object */ nt->pNext = tab->pTrigger; tab->pTrigger = nt; return; } else { sqliteFree(nt->strings); sqliteFree(nt->name); sqliteFree(nt->table); sqliteFree(nt); } trigger_cleanup: sqliteIdListDelete(cols); sqliteExprDelete(pWhen); { TriggerStep * pp; TriggerStep * nn; pp = steps; while (pp) { nn = pp->pNext; sqliteExprDelete(pp->pWhere); sqliteExprListDelete(pp->pExprList); sqliteSelectDelete(pp->pSelect); sqliteIdListDelete(pp->pIdList); sqliteFree(pp); pp = nn; } } } TriggerStep * sqliteTriggerSelectStep(Select * s) { TriggerStep * tt = sqliteMalloc(sizeof(TriggerStep)); tt->op = TK_SELECT; tt->pSelect = s; tt->orconf = OE_Default; return tt; } TriggerStep * sqliteTriggerInsertStep(Token * tbl, IdList * col, ExprList * val, Select * s, int orconf) { TriggerStep * tt = sqliteMalloc(sizeof(TriggerStep)); assert(val == 0 || s == 0); assert(val != 0 || s != 0); tt->op = TK_INSERT; tt->pSelect = s; tt->target = *tbl; tt->pIdList = col; tt->pExprList = val; tt->orconf = orconf; return tt; } TriggerStep * sqliteTriggerUpdateStep(Token * tbl, ExprList * val, Expr * w, int orconf) { TriggerStep * tt = sqliteMalloc(sizeof(TriggerStep)); tt->op = TK_UPDATE; tt->target = *tbl; tt->pExprList = val; tt->pWhere = w; tt->orconf = orconf; return tt; } TriggerStep * sqliteTriggerDeleteStep(Token * tbl, Expr * w) { TriggerStep * tt = sqliteMalloc(sizeof(TriggerStep)); tt->op = TK_DELETE; tt->target = *tbl; tt->pWhere = w; tt->orconf = OE_Default; return tt; } /* This does a recursive delete of the trigger structure */ void sqliteDeleteTrigger(Trigger * tt) { TriggerStep * ts, * tc; ts = tt->step_list; while (ts) { tc = ts; ts = ts->pNext; sqliteExprDelete(tc->pWhere); sqliteExprListDelete(tc->pExprList); sqliteSelectDelete(tc->pSelect); sqliteIdListDelete(tc->pIdList); sqliteFree(tc); } sqliteFree(tt->name); sqliteFree(tt->table); sqliteExprDelete(tt->pWhen); sqliteIdListDelete(tt->pColumns); sqliteFree(tt->strings); sqliteFree(tt); } /* * "nested" is true if this is begin called as the result of a DROP TABLE */ void sqliteDropTrigger(Parse *pParse, Token * trigname, int nested) { char * tmp_name; Trigger * trig; Table * tbl; tmp_name = sqliteStrNDup(trigname->z, trigname->n); /* ensure that the trigger being dropped exists */ trig = sqliteHashFind(&(pParse->db->trigHash), tmp_name, trigname->n + 1); if (!trig) { sqliteSetNString(&pParse->zErrMsg, "no such trigger: ", -1, tmp_name, -1, 0); sqliteFree(tmp_name); return; } /* * If this is not an "explain", do the following: * 1. Remove the trigger from its associated table structure * 2. Move the trigger from the trigHash hash to trigDrop */ if (!pParse->explain) { /* 1 */ tbl = sqliteFindTable(pParse->db, trig->table); assert(tbl); if (tbl->pTrigger == trig) tbl->pTrigger = trig->pNext; else { Trigger * cc = tbl->pTrigger; while (cc) { if (cc->pNext == trig) { cc->pNext = cc->pNext->pNext; break; } cc = cc->pNext; } assert(cc); } /* 2 */ sqliteHashInsert(&(pParse->db->trigHash), tmp_name, trigname->n + 1, NULL); sqliteHashInsert(&(pParse->db->trigDrop), trig->name, trigname->n + 1, trig); } /* Unless this is a trigger on a TEMP TABLE, generate code to destroy the * database record of the trigger */ if (!tbl->isTemp) { int base; static VdbeOp dropTrigger[] = { { OP_OpenWrite, 0, 2, MASTER_NAME}, { OP_Rewind, 0, ADDR(9), 0}, { OP_String, 0, 0, 0}, /* 2 */ { OP_MemStore, 1, 1, 0}, { OP_MemLoad, 1, 0, 0}, /* 4 */ { OP_Column, 0, 1, 0}, { OP_Ne, 0, ADDR(8), 0}, { OP_Delete, 0, 0, 0}, { OP_Next, 0, ADDR(4), 0}, /* 8 */ { OP_Integer, 0, 0, 0}, /* 9 */ { OP_SetCookie, 0, 0, 0}, { OP_Close, 0, 0, 0}, }; if (!nested) sqliteBeginWriteOperation(pParse); base = sqliteVdbeAddOpList(pParse->pVdbe, ArraySize(dropTrigger), dropTrigger); sqliteVdbeChangeP3(pParse->pVdbe, base+2, tmp_name, 0); if (!nested) changeCookie(pParse->db); sqliteVdbeChangeP1(pParse->pVdbe, base+9, pParse->db->next_cookie); if (!nested) sqliteEndWriteOperation(pParse); } sqliteFree(tmp_name); } static int checkColumnOverLap(IdList * ii, ExprList * ee) { int i, e; if (!ii) return 1; if (!ee) return 1; for (i = 0; i < ii->nId; i++) for (e = 0; e < ee->nExpr; e++) if (!sqliteStrICmp(ii->a[i].zName, ee->a[e].zName)) return 1; return 0; } /* A global variable that is TRUE if we should always set up temp tables for * for triggers, even if there are no triggers to code. This is used to test * how much overhead the triggers algorithm is causing. * * This flag can be set or cleared using the "trigger_overhead_test" pragma. * The pragma is not documented since it is not really part of the interface * to SQLite, just the test procedure. */ int always_code_trigger_setup = 0; /* * Returns true if a trigger matching op, tr_tm and foreach that is NOT already * on the Parse objects trigger-stack (to prevent recursive trigger firing) is * found in the list specified as pTrigger. */ int sqliteTriggersExist( Parse * pParse, Trigger * pTrigger, int op, /* one of TK_DELETE, TK_INSERT, TK_UPDATE */ int tr_tm, /* one of TK_BEFORE, TK_AFTER */ int foreach, /* one of TK_ROW or TK_STATEMENT */ ExprList * pChanges) { Trigger * tt; if (always_code_trigger_setup) return 1; tt = pTrigger; while (tt) { if (tt->op == op && tt->tr_tm == tr_tm && tt->foreach == foreach && checkColumnOverLap(tt->pColumns, pChanges)) { TriggerStack * ss; ss = pParse->trigStack; while (ss && ss->pTrigger != pTrigger) ss = ss->pNext; if (!ss) return 1; } tt = tt->pNext; } return 0; } static int codeTriggerProgram( Parse *pParse, TriggerStep * program, int onError) { TriggerStep * step = program; int orconf; while (step) { int saveNTab = pParse->nTab; orconf = (onError == OE_Default)?step->orconf:onError; pParse->trigStack->orconf = orconf; switch(step->op) { case TK_SELECT: { int tmp_tbl = pParse->nTab++; sqliteVdbeAddOp(pParse->pVdbe, OP_OpenTemp, tmp_tbl, 0); sqliteVdbeAddOp(pParse->pVdbe, OP_KeyAsData, tmp_tbl, 1); sqliteSelect(pParse, step->pSelect, SRT_Union, tmp_tbl, 0, 0, 0); sqliteVdbeAddOp(pParse->pVdbe, OP_Close, tmp_tbl, 0); pParse->nTab--; break; } case TK_UPDATE: { sqliteVdbeAddOp(pParse->pVdbe, OP_PushList, 0, 0); sqliteUpdate(pParse, &step->target, sqliteExprListDup(step->pExprList), sqliteExprDup(step->pWhere), orconf); sqliteVdbeAddOp(pParse->pVdbe, OP_PopList, 0, 0); break; } case TK_INSERT: { sqliteInsert(pParse, &step->target, sqliteExprListDup(step->pExprList), sqliteSelectDup(step->pSelect), sqliteIdListDup(step->pIdList), orconf); break; } case TK_DELETE: { sqliteVdbeAddOp(pParse->pVdbe, OP_PushList, 0, 0); sqliteDeleteFrom(pParse, &step->target, sqliteExprDup(step->pWhere) ); sqliteVdbeAddOp(pParse->pVdbe, OP_PopList, 0, 0); break; } default: assert(0); } pParse->nTab = saveNTab; step = step->pNext; } return 0; } int sqliteCodeRowTrigger( Parse * pParse, /* Parse context */ int op, /* One of TK_UPDATE, TK_INSERT, TK_DELETE */ ExprList * changes, /* Changes list for any UPDATE OF triggers */ int tr_tm, /* One of TK_BEFORE, TK_AFTER */ Table * tbl, /* The table to code triggers from */ int newTable, /* The indice of the "new" row to access */ int oldTable, /* The indice of the "old" row to access */ int onError) /* ON CONFLICT policy */ { Trigger * pTrigger; TriggerStack * pTriggerStack; assert(op == TK_UPDATE || op == TK_INSERT || op == TK_DELETE); assert(tr_tm == TK_BEFORE || tr_tm == TK_AFTER); assert(newTable != -1 || oldTable != -1); pTrigger = tbl->pTrigger; while (pTrigger) { int fire_this = 0; /* determine whether we should code this trigger */ if (pTrigger->op == op && pTrigger->tr_tm == tr_tm && pTrigger->foreach == TK_ROW) { fire_this = 1; pTriggerStack = pParse->trigStack; while (pTriggerStack) { if (pTriggerStack->pTrigger == pTrigger) fire_this = 0; pTriggerStack = pTriggerStack->pNext; } if (op == TK_UPDATE && pTrigger->pColumns && !checkColumnOverLap(pTrigger->pColumns, changes)) fire_this = 0; } if (fire_this) { int endTrigger; IdList dummyTablist; Expr * whenExpr; dummyTablist.nId = 0; dummyTablist.a = 0; /* Push an entry on to the trigger stack */ pTriggerStack = sqliteMalloc(sizeof(TriggerStack)); pTriggerStack->pTrigger = pTrigger; pTriggerStack->newIdx = newTable; pTriggerStack->oldIdx = oldTable; pTriggerStack->pTab = tbl; pTriggerStack->pNext = pParse->trigStack; pParse->trigStack = pTriggerStack; /* code the WHEN clause */ endTrigger = sqliteVdbeMakeLabel(pParse->pVdbe); whenExpr = sqliteExprDup(pTrigger->pWhen); if (sqliteExprResolveIds(pParse, 0, &dummyTablist, 0, whenExpr)) { pParse->trigStack = pParse->trigStack->pNext; sqliteFree(pTriggerStack); sqliteExprDelete(whenExpr); return 1; } sqliteExprIfFalse(pParse, whenExpr, endTrigger); sqliteExprDelete(whenExpr); codeTriggerProgram(pParse, pTrigger->step_list, onError); /* Pop the entry off the trigger stack */ pParse->trigStack = pParse->trigStack->pNext; sqliteFree(pTriggerStack); sqliteVdbeResolveLabel(pParse->pVdbe, endTrigger); } pTrigger = pTrigger->pNext; } return 0; } /* * Handle UPDATE and DELETE triggers on views */ void sqliteViewTriggers(Parse *pParse, Table *pTab, Expr * pWhere, int onError, ExprList * pChanges) { int oldIdx = -1; int newIdx = -1; int *aXRef = 0; Vdbe *v; int endOfLoop; int startOfLoop; Select theSelect; Token tblNameToken; assert(pTab->pSelect); tblNameToken.z = pTab->zName; tblNameToken.n = strlen(pTab->zName); theSelect.isDistinct = 0; theSelect.pEList = sqliteExprListAppend(0, sqliteExpr(TK_ALL, 0, 0, 0), 0); theSelect.pSrc = sqliteIdListAppend(0, &tblNameToken); theSelect.pWhere = pWhere; pWhere = 0; theSelect.pGroupBy = 0; theSelect.pHaving = 0; theSelect.pOrderBy = 0; theSelect.op = TK_SELECT; /* ?? */ theSelect.pPrior = 0; theSelect.nLimit = -1; theSelect.nOffset = -1; theSelect.zSelect = 0; theSelect.base = 0; v = sqliteGetVdbe(pParse); assert(v); sqliteBeginMultiWriteOperation(pParse); /* Allocate temp tables */ oldIdx = pParse->nTab++; sqliteVdbeAddOp(v, OP_OpenTemp, oldIdx, 0); if (pChanges) { newIdx = pParse->nTab++; sqliteVdbeAddOp(v, OP_OpenTemp, newIdx, 0); } /* Snapshot the view */ if (sqliteSelect(pParse, &theSelect, SRT_Table, oldIdx, 0, 0, 0)) { goto trigger_cleanup; } /* loop thru the view snapshot, executing triggers for each row */ endOfLoop = sqliteVdbeMakeLabel(v); sqliteVdbeAddOp(v, OP_Rewind, oldIdx, endOfLoop); /* Loop thru the view snapshot, executing triggers for each row */ startOfLoop = sqliteVdbeCurrentAddr(v); /* Build the updated row if required */ if (pChanges) { int ii, jj; aXRef = sqliteMalloc( sizeof(int) * pTab->nCol ); if( aXRef==0 ) goto trigger_cleanup; for (ii = 0; ii < pTab->nCol; ii++) aXRef[ii] = -1; for(ii=0; ii<pChanges->nExpr; ii++){ int jj; if( sqliteExprResolveIds(pParse, oldIdx, theSelect.pSrc , 0, pChanges->a[ii].pExpr) ) goto trigger_cleanup; if( sqliteExprCheck(pParse, pChanges->a[ii].pExpr, 0, 0) ) goto trigger_cleanup; for(jj=0; jj<pTab->nCol; jj++){ if( sqliteStrICmp(pTab->aCol[jj].zName, pChanges->a[ii].zName)==0 ){ aXRef[jj] = ii; break; } } if( jj>=pTab->nCol ){ sqliteSetString(&pParse->zErrMsg, "no such column: ", pChanges->a[ii].zName, 0); pParse->nErr++; goto trigger_cleanup; } } sqliteVdbeAddOp(v, OP_Integer, 13, 0); for (ii = 0; ii < pTab->nCol; ii++) if( aXRef[ii] < 0 ) sqliteVdbeAddOp(v, OP_Column, oldIdx, ii); else sqliteExprCode(pParse, pChanges->a[aXRef[ii]].pExpr); sqliteVdbeAddOp(v, OP_MakeRecord, pTab->nCol, 0); sqliteVdbeAddOp(v, OP_PutIntKey, newIdx, 0); sqliteVdbeAddOp(v, OP_Rewind, newIdx, 0); sqliteCodeRowTrigger(pParse, TK_UPDATE, pChanges, TK_BEFORE, pTab, newIdx, oldIdx, onError); sqliteCodeRowTrigger(pParse, TK_UPDATE, pChanges, TK_AFTER, pTab, newIdx, oldIdx, onError); } else { sqliteCodeRowTrigger(pParse, TK_DELETE, 0, TK_BEFORE, pTab, -1, oldIdx, onError); sqliteCodeRowTrigger(pParse, TK_DELETE, 0, TK_AFTER, pTab, -1, oldIdx, onError); } sqliteVdbeAddOp(v, OP_Next, oldIdx, startOfLoop); sqliteVdbeResolveLabel(v, endOfLoop); sqliteEndWriteOperation(pParse); trigger_cleanup: sqliteFree(aXRef); sqliteExprListDelete(pChanges); sqliteExprDelete(pWhere); sqliteExprListDelete(theSelect.pEList); sqliteIdListDelete(theSelect.pSrc); sqliteExprDelete(theSelect.pWhere); return; } |
Changes to src/update.c.
︙ | ︙ | |||
8 9 10 11 12 13 14 | ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** This file contains C code routines that are called by the parser ** to handle UPDATE statements. ** | | | 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** This file contains C code routines that are called by the parser ** to handle UPDATE statements. ** ** $Id: update.c,v 1.37 2002/05/15 08:30:14 danielk1977 Exp $ */ #include "sqliteInt.h" /* ** Process an UPDATE statement. */ void sqliteUpdate( |
︙ | ︙ | |||
43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 | ** an expression for the i-th column of the table. ** aXRef[i]==-1 if the i-th column is not changed. */ int openOp; /* Opcode used to open tables */ int chngRecno; /* True if the record number is being changed */ Expr *pRecnoExpr; /* Expression defining the new record number */ int openAll; /* True if all indices need to be opened */ if( pParse->nErr || sqlite_malloc_failed ) goto update_cleanup; db = pParse->db; /* Locate the table which we want to update. This table has to be ** put in an IdList structure because some of the subroutines we ** will be calling are designed to work with multiple tables and expect ** an IdList* parameter instead of just a Table* parameter. */ pTabList = sqliteTableTokenToIdList(pParse, pTableName); if( pTabList==0 ) goto update_cleanup; pTab = pTabList->a[0].pTab; assert( pTab->pSelect==0 ); /* This table is not a VIEW */ aXRef = sqliteMalloc( sizeof(int) * pTab->nCol ); if( aXRef==0 ) goto update_cleanup; for(i=0; i<pTab->nCol; i++) aXRef[i] = -1; /* Resolve the column names in all the expressions in both the ** WHERE clause and in the new values. Also find the column index ** for each column to be updated in the pChanges array. */ base = pParse->nTab++; if( pWhere ){ | > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > | 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 | ** an expression for the i-th column of the table. ** aXRef[i]==-1 if the i-th column is not changed. */ int openOp; /* Opcode used to open tables */ int chngRecno; /* True if the record number is being changed */ Expr *pRecnoExpr; /* Expression defining the new record number */ int openAll; /* True if all indices need to be opened */ int row_triggers_exist = 0; int newIdx = -1; /* index of trigger "new" temp table */ int oldIdx = -1; /* index of trigger "old" temp table */ if( pParse->nErr || sqlite_malloc_failed ) goto update_cleanup; db = pParse->db; /* Check for the special case of a VIEW with one or more ON UPDATE triggers * defined */ { char * zTab = sqliteTableNameFromToken(pTableName); if(zTab != 0) { pTab = sqliteFindTable(pParse->db, zTab); if (pTab) { row_triggers_exist = sqliteTriggersExist(pParse, pTab->pTrigger, TK_UPDATE, TK_BEFORE, TK_ROW, pChanges) || sqliteTriggersExist(pParse, pTab->pTrigger, TK_UPDATE, TK_AFTER, TK_ROW, pChanges); } sqliteFree(zTab); if (row_triggers_exist && pTab->pSelect ) { /* Just fire VIEW triggers */ sqliteViewTriggers(pParse, pTab, pWhere, onError, pChanges); return; } } } /* Locate the table which we want to update. This table has to be ** put in an IdList structure because some of the subroutines we ** will be calling are designed to work with multiple tables and expect ** an IdList* parameter instead of just a Table* parameter. */ pTabList = sqliteTableTokenToIdList(pParse, pTableName); if( pTabList==0 ) goto update_cleanup; pTab = pTabList->a[0].pTab; assert( pTab->pSelect==0 ); /* This table is not a VIEW */ aXRef = sqliteMalloc( sizeof(int) * pTab->nCol ); if( aXRef==0 ) goto update_cleanup; for(i=0; i<pTab->nCol; i++) aXRef[i] = -1; if (row_triggers_exist) { newIdx = pParse->nTab++; oldIdx = pParse->nTab++; } /* Resolve the column names in all the expressions in both the ** WHERE clause and in the new values. Also find the column index ** for each column to be updated in the pChanges array. */ base = pParse->nTab++; if( pWhere ){ |
︙ | ︙ | |||
155 156 157 158 159 160 161 | /* End the database scan loop. */ sqliteWhereEnd(pWInfo); /* Initialize the count of updated rows */ | | > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > < | 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 | /* End the database scan loop. */ sqliteWhereEnd(pWInfo); /* Initialize the count of updated rows */ if( db->flags & SQLITE_CountRows && !pParse->trigStack ){ sqliteVdbeAddOp(v, OP_Integer, 0, 0); } if (row_triggers_exist) { int ii; sqliteVdbeAddOp(v, OP_OpenTemp, oldIdx, 0); sqliteVdbeAddOp(v, OP_OpenTemp, newIdx, 0); sqliteVdbeAddOp(v, OP_ListRewind, 0, 0); addr = sqliteVdbeAddOp(v, OP_ListRead, 0, 0); sqliteVdbeAddOp(v, OP_Dup, 0, 0); sqliteVdbeAddOp(v, OP_Dup, 0, 0); sqliteVdbeAddOp(v, OP_Open, base, pTab->tnum); sqliteVdbeAddOp(v, OP_MoveTo, base, 0); sqliteVdbeAddOp(v, OP_Integer, 13, 0); for (ii = 0; ii < pTab->nCol; ii++) { if (ii == pTab->iPKey) sqliteVdbeAddOp(v, OP_Recno, base, 0); else sqliteVdbeAddOp(v, OP_Column, base, ii); } sqliteVdbeAddOp(v, OP_MakeRecord, pTab->nCol, 0); sqliteVdbeAddOp(v, OP_PutIntKey, oldIdx, 0); sqliteVdbeAddOp(v, OP_Integer, 13, 0); for (ii = 0; ii < pTab->nCol; ii++){ if( aXRef[ii] < 0 ){ if (ii == pTab->iPKey) sqliteVdbeAddOp(v, OP_Recno, base, 0); else sqliteVdbeAddOp(v, OP_Column, base, ii); }else{ sqliteExprCode(pParse, pChanges->a[aXRef[ii]].pExpr); } } sqliteVdbeAddOp(v, OP_MakeRecord, pTab->nCol, 0); sqliteVdbeAddOp(v, OP_PutIntKey, newIdx, 0); sqliteVdbeAddOp(v, OP_Close, base, 0); sqliteVdbeAddOp(v, OP_Rewind, oldIdx, 0); sqliteVdbeAddOp(v, OP_Rewind, newIdx, 0); if (sqliteCodeRowTrigger(pParse, TK_UPDATE, pChanges, TK_BEFORE, pTab, newIdx, oldIdx, onError)) goto update_cleanup; } /* Rewind the list of records that need to be updated and ** open every index that needs updating. Note that if any ** index could potentially invoke a REPLACE conflict resolution ** action, then we need to open all indices because we might need ** to be deleting some records. */ openOp = pTab->isTemp ? OP_OpenWrAux : OP_OpenWrite; sqliteVdbeAddOp(v, openOp, base, pTab->tnum); if( onError==OE_Replace ){ openAll = 1; }else{ openAll = 0; for(pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext){ |
︙ | ︙ | |||
193 194 195 196 197 198 199 | /* Loop over every record that needs updating. We have to load ** the old data for each record to be updated because some columns ** might not change and we will need to copy the old value. ** Also, the old data is needed to delete the old index entires. ** So make the cursor point at the old record. */ | > > > | | > | 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 | /* Loop over every record that needs updating. We have to load ** the old data for each record to be updated because some columns ** might not change and we will need to copy the old value. ** Also, the old data is needed to delete the old index entires. ** So make the cursor point at the old record. */ if (!row_triggers_exist) { int ii; sqliteVdbeAddOp(v, OP_ListRewind, 0, 0); addr = sqliteVdbeAddOp(v, OP_ListRead, 0, 0); sqliteVdbeAddOp(v, OP_Dup, 0, 0); } sqliteVdbeAddOp(v, OP_MoveTo, base, 0); /* If the record number will change, push the record number as it ** will be after the update. (The old record number is currently ** on top of the stack.) */ if( chngRecno ){ |
︙ | ︙ | |||
237 238 239 240 241 242 243 | /* Delete the old indices for the current record. */ sqliteGenerateRowIndexDelete(v, pTab, base, aIdxUsed); /* If changing the record number, delete the old record. */ if( chngRecno ){ | | | > > > > > > > > > > > > > > > > > > > > > > > > > > > | | 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 | /* Delete the old indices for the current record. */ sqliteGenerateRowIndexDelete(v, pTab, base, aIdxUsed); /* If changing the record number, delete the old record. */ if( chngRecno ){ sqliteVdbeAddOp(v, OP_Delete, base, 0); } /* Create the new index entries and the new record. */ sqliteCompleteInsertion(pParse, pTab, base, aIdxUsed, chngRecno, 1); /* Increment the row counter */ if( db->flags & SQLITE_CountRows && !pParse->trigStack){ sqliteVdbeAddOp(v, OP_AddImm, 1, 0); } if (row_triggers_exist) { for(i=0, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, i++){ if( openAll || aIdxUsed[i] ) sqliteVdbeAddOp(v, OP_Close, base+i+1, 0); } sqliteVdbeAddOp(v, OP_Close, base, 0); pParse->nTab = base; if (sqliteCodeRowTrigger(pParse, TK_UPDATE, pChanges, TK_AFTER, pTab, newIdx, oldIdx, onError)) goto update_cleanup; } /* Repeat the above with the next record to be updated, until ** all record selected by the WHERE clause have been updated. */ sqliteVdbeAddOp(v, OP_Goto, 0, addr); sqliteVdbeChangeP2(v, addr, sqliteVdbeCurrentAddr(v)); sqliteVdbeAddOp(v, OP_ListReset, 0, 0); /* Close all tables if there were no FOR EACH ROW triggers */ if (!row_triggers_exist) { for(i=0, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, i++){ if( openAll || aIdxUsed[i] ){ sqliteVdbeAddOp(v, OP_Close, base+i+1, 0); } } sqliteVdbeAddOp(v, OP_Close, base, 0); pParse->nTab = base; } else { sqliteVdbeAddOp(v, OP_Close, newIdx, 0); sqliteVdbeAddOp(v, OP_Close, oldIdx, 0); } sqliteEndWriteOperation(pParse); /* ** Return the number of rows that were changed. */ if( db->flags & SQLITE_CountRows && !pParse->trigStack ){ sqliteVdbeAddOp(v, OP_ColumnCount, 1, 0); sqliteVdbeAddOp(v, OP_ColumnName, 0, 0); sqliteVdbeChangeP3(v, -1, "rows updated", P3_STATIC); sqliteVdbeAddOp(v, OP_Callback, 1, 0); } update_cleanup: |
︙ | ︙ |
Changes to src/vdbe.c.
︙ | ︙ | |||
26 27 28 29 30 31 32 | ** type to the other occurs as necessary. ** ** Most of the code in this file is taken up by the sqliteVdbeExec() ** function which does the work of interpreting a VDBE program. ** But other routines are also provided to help in building up ** a program instruction by instruction. ** | | | 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 | ** type to the other occurs as necessary. ** ** Most of the code in this file is taken up by the sqliteVdbeExec() ** function which does the work of interpreting a VDBE program. ** But other routines are also provided to help in building up ** a program instruction by instruction. ** ** $Id: vdbe.c,v 1.142 2002/05/15 08:30:14 danielk1977 Exp $ */ #include "sqliteInt.h" #include <ctype.h> /* ** The following global variable is incremented every time a cursor ** moves, either by the OP_MoveTo or the OP_Next opcode. The test |
︙ | ︙ | |||
245 246 247 248 249 250 251 252 253 254 255 256 257 258 | Mem *aMem; /* The memory locations */ Agg agg; /* Aggregate information */ int nSet; /* Number of sets allocated */ Set *aSet; /* An array of sets */ int nCallback; /* Number of callbacks invoked so far */ int iLimit; /* Limit on the number of callbacks remaining */ int iOffset; /* Offset before beginning to do callbacks */ }; /* ** Create a new virtual database engine. */ Vdbe *sqliteVdbeCreate(sqlite *db){ Vdbe *p; | > > > | 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 | Mem *aMem; /* The memory locations */ Agg agg; /* Aggregate information */ int nSet; /* Number of sets allocated */ Set *aSet; /* An array of sets */ int nCallback; /* Number of callbacks invoked so far */ int iLimit; /* Limit on the number of callbacks remaining */ int iOffset; /* Offset before beginning to do callbacks */ int keylistStackDepth; Keylist ** keylistStack; }; /* ** Create a new virtual database engine. */ Vdbe *sqliteVdbeCreate(sqlite *db){ Vdbe *p; |
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995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 | AggReset(&p->agg); for(i=0; i<p->nSet; i++){ sqliteHashClear(&p->aSet[i].hash); } sqliteFree(p->aSet); p->aSet = 0; p->nSet = 0; } /* ** Delete an entire VDBE. */ void sqliteVdbeDelete(Vdbe *p){ int i; | > > > > > > > > > | 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 | AggReset(&p->agg); for(i=0; i<p->nSet; i++){ sqliteHashClear(&p->aSet[i].hash); } sqliteFree(p->aSet); p->aSet = 0; p->nSet = 0; if (p->keylistStackDepth > 0) { int ii; for (ii = 0; ii < p->keylistStackDepth; ii++) { KeylistFree(p->keylistStack[ii]); } sqliteFree(p->keylistStack); p->keylistStackDepth = 0; p->keylistStack = 0; } } /* ** Delete an entire VDBE. */ void sqliteVdbeDelete(Vdbe *p){ int i; |
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1058 1059 1060 1061 1062 1063 1064 | "MustBeInt", "Add", "AddImm", "Subtract", "Multiply", "Divide", "Remainder", "BitAnd", "BitOr", "BitNot", "ShiftLeft", "ShiftRight", "AbsValue", "Eq", "Ne", "Lt", "Le", "Gt", "Ge", "IsNull", "NotNull", "Negative", "And", "Or", "Not", "Concat", "Noop", "Function", | | | 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 | "MustBeInt", "Add", "AddImm", "Subtract", "Multiply", "Divide", "Remainder", "BitAnd", "BitOr", "BitNot", "ShiftLeft", "ShiftRight", "AbsValue", "Eq", "Ne", "Lt", "Le", "Gt", "Ge", "IsNull", "NotNull", "Negative", "And", "Or", "Not", "Concat", "Noop", "Function", "Limit", "PushList", "PopList", }; /* ** Given the name of an opcode, return its number. Return 0 if ** there is no match. ** ** This routine is used for testing and debugging. |
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4534 4535 4536 4537 4538 4539 4540 4541 4542 4543 4544 4545 4546 4547 | if( VERIFY( i>=0 && i<p->nSet &&) sqliteHashFind(&p->aSet[i].hash, zStack[tos], aStack[tos].n)){ pc = pOp->p2 - 1; } POPSTACK; break; } /* Opcode: SetNotFound P1 P2 * ** ** Pop the stack once and compare the value popped off with the ** contents of set P1. If the element popped does not exists in ** set P1, then jump to P2. Otherwise fall through. */ | > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > | 4546 4547 4548 4549 4550 4551 4552 4553 4554 4555 4556 4557 4558 4559 4560 4561 4562 4563 4564 4565 4566 4567 4568 4569 4570 4571 4572 4573 4574 4575 4576 4577 4578 4579 4580 4581 4582 4583 4584 4585 4586 4587 4588 4589 4590 4591 4592 | if( VERIFY( i>=0 && i<p->nSet &&) sqliteHashFind(&p->aSet[i].hash, zStack[tos], aStack[tos].n)){ pc = pOp->p2 - 1; } POPSTACK; break; } /* Opcode: PushList * * * ** ** Save the current Vdbe list such that it can be restored by a PopList ** opcode. The list is empty after this is executed. */ case OP_PushList: { p->keylistStackDepth++; assert(p->keylistStackDepth > 0); p->keylistStack = sqliteRealloc(p->keylistStack, sizeof(Keylist *) * p->keylistStackDepth); p->keylistStack[p->keylistStackDepth - 1] = p->pList; p->pList = 0; break; } /* Opcode: PopList * * * ** ** Restore the Vdbe list to the state it was in when PushList was last ** executed. */ case OP_PopList: { assert(p->keylistStackDepth > 0); p->keylistStackDepth--; KeylistFree(p->pList); p->pList = p->keylistStack[p->keylistStackDepth]; p->keylistStack[p->keylistStackDepth] = 0; if (p->keylistStackDepth == 0) { sqliteFree(p->keylistStack); p->keylistStack = 0; } break; } /* Opcode: SetNotFound P1 P2 * ** ** Pop the stack once and compare the value popped off with the ** contents of set P1. If the element popped does not exists in ** set P1, then jump to P2. Otherwise fall through. */ |
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Changes to src/vdbe.h.
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11 12 13 14 15 16 17 | ************************************************************************* ** Header file for the Virtual DataBase Engine (VDBE) ** ** This header defines the interface to the virtual database engine ** or VDBE. The VDBE implements an abstract machine that runs a ** simple program to access and modify the underlying database. ** | | | 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 | ************************************************************************* ** Header file for the Virtual DataBase Engine (VDBE) ** ** This header defines the interface to the virtual database engine ** or VDBE. The VDBE implements an abstract machine that runs a ** simple program to access and modify the underlying database. ** ** $Id: vdbe.h,v 1.51 2002/05/15 08:30:14 danielk1977 Exp $ */ #ifndef _SQLITE_VDBE_H_ #define _SQLITE_VDBE_H_ #include <stdio.h> /* ** A single VDBE is an opaque structure named "Vdbe". Only routines |
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194 195 196 197 198 199 200 | #define OP_Not 109 #define OP_Concat 110 #define OP_Noop 111 #define OP_Function 112 #define OP_Limit 113 | > > > | | 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 | #define OP_Not 109 #define OP_Concat 110 #define OP_Noop 111 #define OP_Function 112 #define OP_Limit 113 #define OP_PushList 114 #define OP_PopList 115 #define OP_MAX 115 /* ** Prototypes for the VDBE interface. See comments on the implementation ** for a description of what each of these routines does. */ Vdbe *sqliteVdbeCreate(sqlite*); void sqliteVdbeCreateCallback(Vdbe*, int*); |
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Changes to src/where.c.
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9 10 11 12 13 14 15 | ** May you share freely, never taking more than you give. ** ************************************************************************* ** This module contains C code that generates VDBE code used to process ** the WHERE clause of SQL statements. Also found here are subroutines ** to generate VDBE code to evaluate expressions. ** | | | 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 | ** May you share freely, never taking more than you give. ** ************************************************************************* ** This module contains C code that generates VDBE code used to process ** the WHERE clause of SQL statements. Also found here are subroutines ** to generate VDBE code to evaluate expressions. ** ** $Id: where.c,v 1.42 2002/05/15 08:30:14 danielk1977 Exp $ */ #include "sqliteInt.h" /* ** The query generator uses an array of instances of this structure to ** help it analyze the subexpressions of the WHERE clause. Each WHERE ** clause subexpression is separated from the others by an AND operator. |
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212 213 214 215 216 217 218 219 220 221 222 223 224 225 | memset(aExpr, 0, sizeof(aExpr)); nExpr = exprSplit(ARRAYSIZE(aExpr), aExpr, pWhere); /* Analyze all of the subexpressions. */ for(i=0; i<nExpr; i++){ exprAnalyze(base, &aExpr[i]); } /* Figure out a good nesting order for the tables. aOrder[0] will ** be the index in pTabList of the outermost table. aOrder[1] will ** be the first nested loop and so on. aOrder[pTabList->nId-1] will ** be the innermost loop. ** | > > > > > > > > > > > > > > > > | 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 | memset(aExpr, 0, sizeof(aExpr)); nExpr = exprSplit(ARRAYSIZE(aExpr), aExpr, pWhere); /* Analyze all of the subexpressions. */ for(i=0; i<nExpr; i++){ exprAnalyze(base, &aExpr[i]); if (pParse->trigStack && pParse->trigStack->newIdx >= 0) { aExpr[i].prereqRight = aExpr[i].prereqRight & ~(1 << pParse->trigStack->newIdx - base); aExpr[i].prereqLeft = aExpr[i].prereqLeft & ~(1 << pParse->trigStack->newIdx - base); aExpr[i].prereqAll = aExpr[i].prereqAll & ~(1 << pParse->trigStack->newIdx - base); } if (pParse->trigStack && pParse->trigStack->oldIdx >= 0) { aExpr[i].prereqRight = aExpr[i].prereqRight & ~(1 << pParse->trigStack->oldIdx - base); aExpr[i].prereqLeft = aExpr[i].prereqLeft & ~(1 << pParse->trigStack->oldIdx - base); aExpr[i].prereqAll = aExpr[i].prereqAll & ~(1 << pParse->trigStack->oldIdx - base); } } /* Figure out a good nesting order for the tables. aOrder[0] will ** be the index in pTabList of the outermost table. aOrder[1] will ** be the first nested loop and so on. aOrder[pTabList->nId-1] will ** be the innermost loop. ** |
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Added test/trigger1.test.
> > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 | # The author disclaims copyright to this source code. In place of # a legal notice, here is a blessing: # # May you do good and not evil. # May you find forgiveness for yourself and forgive others. # May you share freely, never taking more than you give. # #*********************************************************************** # # This file tests creating and dropping triggers, and interaction thereof # with the database COMMIT/ROLLBACK logic. # # 1. CREATE and DROP TRIGGER tests # trig-1.1: Error if table does not exist # trig-1.2: Error if trigger already exists # trig-1.3: Created triggers are deleted if the transaction is rolled back # trig-1.4: DROP TRIGGER removes trigger # trig-1.5: Dropped triggers are restored if the transaction is rolled back # trig-1.6: Error if dropped trigger doesn't exist # trig-1.7: Dropping the table automatically drops all triggers # trig-1.8: A trigger created on a TEMP table is not inserted into sqlite_master # set testdir [file dirname $argv0] source $testdir/tester.tcl do_test trig_cd-1.1 { catchsql { CREATE TRIGGER trig UPDATE ON no_such_table BEGIN SELECT * from sqlite_master; END; } } {1 {no such table: no_such_table}} execsql { CREATE TABLE t1(a); } execsql { CREATE TRIGGER tr1 INSERT ON t1 BEGIN INSERT INTO t1 values(1); END; } do_test trig_cd-1.2 { catchsql { CREATE TRIGGER tr1 DELETE ON t1 BEGIN SELECT * FROM sqlite_master; END } } {1 {trigger tr1 already exists}} do_test trig_cd-1.3 { catchsql { BEGIN; CREATE TRIGGER tr2 INSERT ON t1 BEGIN SELECT * from sqlite_master; END; ROLLBACK; CREATE TRIGGER tr2 INSERT ON t1 BEGIN SELECT * from sqlite_master; END; } } {0 {}} do_test trig_cd-1.4 { catchsql { DROP TRIGGER tr1; CREATE TRIGGER tr1 DELETE ON t1 BEGIN SELECT * FROM sqlite_master; END } } {0 {}} do_test trig_cd-1.5 { execsql { BEGIN; DROP TRIGGER tr2; ROLLBACK; DROP TRIGGER tr2; } } {} do_test trig_cd-1.6 { catchsql { DROP TRIGGER biggles; } } {1 {no such trigger: biggles}} do_test trig_cd-1.7 { catchsql { DROP TABLE t1; DROP TRIGGER tr1; } } {1 {no such trigger: tr1}} execsql { CREATE TEMP TABLE temp_table(a); } do_test trig_cd-1.8 { execsql { CREATE TRIGGER temp_trig UPDATE ON temp_table BEGIN SELECT * from sqlite_master; END; SELECT count(*) FROM sqlite_master WHERE name = 'temp_trig'; } } {0} catchsql { DROP TABLE temp_table; } catchsql { DROP TABLE t1; } finish_test |
Added test/trigger2.test.
> > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 | # The author disclaims copyright to this source code. In place of # a legal notice, here is a blessing: # # May you do good and not evil. # May you find forgiveness for yourself and forgive others. # May you share freely, never taking more than you give. # #*********************************************************************** # # Regression testing of FOR EACH ROW table triggers # # 1. Trigger execution order tests. # These tests ensure that BEFORE and AFTER triggers are fired at the correct # times relative to each other and the triggering statement. # # trig-1.1.*: ON UPDATE trigger execution model. # trig-1.2.*: DELETE trigger execution model. # trig-1.3.*: INSERT trigger execution model. # # 2. Trigger program execution tests. # These tests ensure that trigger programs execute correctly (ie. that a # trigger program can correctly execute INSERT, UPDATE, DELETE * SELECT # statements, and combinations thereof). # # 3. Selective trigger execution # This tests that conditional triggers (ie. UPDATE OF triggers and triggers # with WHEN clauses) are fired only fired when they are supposed to be. # # trig-3.1: UPDATE OF triggers # trig-3.2: WHEN clause # # 4. Cascaded trigger execution # Tests that trigger-programs may cause other triggers to fire. Also that a # trigger-program is never executed recursively. # # trig-4.1: Trivial cascading trigger # trig-4.2: Trivial recursive trigger handling # # 5. Count changes behaviour. # Verify that rows altered by triggers are not included in the return value # of the "count changes" interface. # # 6. ON CONFLICT clause handling # trig-6.1[a-f]: INSERT statements # trig-6.2[a-f]: UPDATE statements # # 7. Triggers on views fire correctly. # set testdir [file dirname $argv0] source $testdir/tester.tcl # 1. set ii 0 foreach tbl_defn [ list \ {CREATE TABLE tbl (a, b);} \ {CREATE TABLE tbl (a INTEGER PRIMARY KEY, b);} \ {CREATE TABLE tbl (a, b PRIMARY KEY);} \ {CREATE TABLE tbl (a, b); CREATE INDEX tbl_idx ON tbl(b);} ] { incr ii catchsql { DROP INDEX tbl_idx; } catchsql { DROP TABLE rlog; DROP TABLE clog; DROP TABLE tbl; DROP TABLE other_tbl; } execsql $tbl_defn execsql { INSERT INTO tbl VALUES(1, 2); INSERT INTO tbl VALUES(3, 4); CREATE TABLE rlog (idx, old_a, old_b, db_sum_a, db_sum_b, new_a, new_b); CREATE TABLE clog (idx, old_a, old_b, db_sum_a, db_sum_b, new_a, new_b); CREATE TRIGGER before_update_row BEFORE UPDATE ON tbl FOR EACH ROW BEGIN INSERT INTO rlog VALUES ( (SELECT max(idx) + 1 FROM rlog), old.a, old.b, (SELECT sum(a) FROM tbl), (SELECT sum(b) FROM tbl), new.a, new.b); END; CREATE TRIGGER after_update_row AFTER UPDATE ON tbl FOR EACH ROW BEGIN INSERT INTO rlog VALUES ( (SELECT max(idx) + 1 FROM rlog), old.a, old.b, (SELECT sum(a) FROM tbl), (SELECT sum(b) FROM tbl), new.a, new.b); END; CREATE TRIGGER conditional_update_row AFTER UPDATE ON tbl FOR EACH ROW WHEN old.a = 1 BEGIN INSERT INTO clog VALUES ( (SELECT max(idx) + 1 FROM clog), old.a, old.b, (SELECT sum(a) FROM tbl), (SELECT sum(b) FROM tbl), new.a, new.b); END; } do_test trig-1.1.$ii { execsql { UPDATE tbl SET a = a * 10, b = b * 10; SELECT * FROM rlog ORDER BY idx; SELECT * FROM clog ORDER BY idx; } } [list 1 1 2 4 6 10 20 \ 2 1 2 13 24 10 20 \ 3 3 4 13 24 30 40 \ 4 3 4 40 60 30 40 \ 1 1 2 13 24 10 20 ] execsql { DELETE FROM rlog; DELETE FROM tbl; INSERT INTO tbl VALUES (100, 100); INSERT INTO tbl VALUES (300, 200); CREATE TRIGGER delete_before_row BEFORE DELETE ON tbl FOR EACH ROW BEGIN INSERT INTO rlog VALUES ( (SELECT max(idx) + 1 FROM rlog), old.a, old.b, (SELECT sum(a) FROM tbl), (SELECT sum(b) FROM tbl), 0, 0); END; CREATE TRIGGER delete_after_row AFTER DELETE ON tbl FOR EACH ROW BEGIN INSERT INTO rlog VALUES ( (SELECT max(idx) + 1 FROM rlog), old.a, old.b, (SELECT sum(a) FROM tbl), (SELECT sum(b) FROM tbl), 0, 0); END; } do_test trig-1.2.$ii { execsql { DELETE FROM tbl; SELECT * FROM rlog; } } [list 1 100 100 400 300 0 0 \ 2 100 100 300 200 0 0 \ 3 300 200 300 200 0 0 \ 4 300 200 0 0 0 0 ] execsql { DELETE FROM rlog; CREATE TRIGGER insert_before_row BEFORE INSERT ON tbl FOR EACH ROW BEGIN INSERT INTO rlog VALUES ( (SELECT max(idx) + 1 FROM rlog), 0, 0, (SELECT sum(a) FROM tbl), (SELECT sum(b) FROM tbl), new.a, new.b); END; CREATE TRIGGER insert_after_row AFTER INSERT ON tbl FOR EACH ROW BEGIN INSERT INTO rlog VALUES ( (SELECT max(idx) + 1 FROM rlog), 0, 0, (SELECT sum(a) FROM tbl), (SELECT sum(b) FROM tbl), new.a, new.b); END; } do_test trig-1.3.$ii { execsql { CREATE TABLE other_tbl(a, b); INSERT INTO other_tbl VALUES(1, 2); INSERT INTO other_tbl VALUES(3, 4); -- INSERT INTO tbl SELECT * FROM other_tbl; INSERT INTO tbl VALUES(5, 6); DROP TABLE other_tbl; SELECT * FROM rlog; } } [list 1 0 0 0 0 5 6 \ 2 0 0 5 6 5 6 ] } catchsql { DROP TABLE rlog; DROP TABLE clog; DROP TABLE tbl; DROP TABLE other_tbl; } # 2. set ii 0 foreach tr_program [ list \ {UPDATE tbl SET b = old.b;} \ {INSERT INTO log VALUES(new.c, 2, 3);} \ {DELETE FROM log WHERE a = 1;} \ {INSERT INTO tbl VALUES(500, new.b * 10, 700); UPDATE tbl SET c = old.c; DELETE FROM log;} \ {INSERT INTO log select * from tbl;} ] \ { foreach test_varset [ list \ { set statement {UPDATE tbl SET c = 10 WHERE a = 1;} set prep {INSERT INTO tbl VALUES(1, 2, 3);} set newC 10 set newB 2 set newA 1 set oldA 1 set oldB 2 set oldC 3 } \ { set statement {DELETE FROM tbl WHERE a = 1;} set prep {INSERT INTO tbl VALUES(1, 2, 3);} set oldA 1 set oldB 2 set oldC 3 } \ { set statement {INSERT INTO tbl VALUES(1, 2, 3);} set newA 1 set newB 2 set newC 3 } ] \ { set statement {} set prep {} set newA {''} set newB {''} set newC {''} set oldA {''} set oldB {''} set oldC {''} incr ii eval $test_varset set statement_type [string range $statement 0 5] set tr_program_fixed $tr_program if {$statement_type == "DELETE"} { regsub -all new\.a $tr_program_fixed {''} tr_program_fixed regsub -all new\.b $tr_program_fixed {''} tr_program_fixed regsub -all new\.c $tr_program_fixed {''} tr_program_fixed } if {$statement_type == "INSERT"} { regsub -all old\.a $tr_program_fixed {''} tr_program_fixed regsub -all old\.b $tr_program_fixed {''} tr_program_fixed regsub -all old\.c $tr_program_fixed {''} tr_program_fixed } set tr_program_cooked $tr_program regsub -all new\.a $tr_program_cooked $newA tr_program_cooked regsub -all new\.b $tr_program_cooked $newB tr_program_cooked regsub -all new\.c $tr_program_cooked $newC tr_program_cooked regsub -all old\.a $tr_program_cooked $oldA tr_program_cooked regsub -all old\.b $tr_program_cooked $oldB tr_program_cooked regsub -all old\.c $tr_program_cooked $oldC tr_program_cooked catchsql { DROP TABLE tbl; DROP TABLE log; } execsql { CREATE TABLE tbl(a PRIMARY KEY, b, c); CREATE TABLE log(a, b, c); } set query {SELECT * FROM tbl; SELECT * FROM log;} set prep "$prep; INSERT INTO log VALUES(1, 2, 3); INSERT INTO log VALUES(10, 20, 30);" # Check execution of BEFORE programs: set before_data [ execsql "$prep $tr_program_cooked $statement $query" ] execsql "DELETE FROM tbl; DELETE FROM log; $prep"; execsql "CREATE TRIGGER the_trigger BEFORE [string range $statement 0 6] ON tbl BEGIN $tr_program_fixed END;" do_test trig-2-$ii-before "execsql {$statement $query}" $before_data execsql "DROP TRIGGER the_trigger;" execsql "DELETE FROM tbl; DELETE FROM log;" # Check execution of AFTER programs set after_data [ execsql "$prep $statement $tr_program_cooked $query" ] execsql "DELETE FROM tbl; DELETE FROM log; $prep"; execsql "CREATE TRIGGER the_trigger AFTER [string range $statement 0 6] ON tbl BEGIN $tr_program_fixed END;" do_test trig-2-$ii-after "execsql {$statement $query}" $after_data execsql "DROP TRIGGER the_trigger;" } } catchsql { DROP TABLE tbl; DROP TABLE log; } # 3. # trig-3.1: UPDATE OF triggers execsql { CREATE TABLE tbl (a, b, c, d); CREATE TABLE log (a); INSERT INTO log VALUES (0); INSERT INTO tbl VALUES (0, 0, 0, 0); INSERT INTO tbl VALUES (1, 0, 0, 0); CREATE TRIGGER tbl_after_update_cd BEFORE UPDATE OF c, d ON tbl BEGIN UPDATE log SET a = a + 1; END; } do_test trig-3.1 { execsql { UPDATE tbl SET b = 1, c = 10; -- 2 UPDATE tbl SET b = 10; -- 0 UPDATE tbl SET d = 4 WHERE a = 0; --1 UPDATE tbl SET a = 4, b = 10; --0 SELECT * FROM log; } } {3} execsql { DROP TABLE tbl; DROP TABLE log; } # trig-3.2: WHEN clause set when_triggers [ list \ {t1 BEFORE INSERT ON tbl WHEN new.a > 20} \ {t2 BEFORE INSERT ON tbl WHEN (SELECT count(*) FROM tbl) = 0} ] execsql { CREATE TABLE tbl (a, b, c, d); CREATE TABLE log (a); INSERT INTO log VALUES (0); } foreach trig $when_triggers { execsql "CREATE TRIGGER $trig BEGIN UPDATE log set a = a + 1; END;" } do_test trig-3.2 { execsql { INSERT INTO tbl VALUES(0, 0, 0, 0); -- 1 SELECT * FROM log; UPDATE log SET a = 0; INSERT INTO tbl VALUES(0, 0, 0, 0); -- 0 SELECT * FROM log; UPDATE log SET a = 0; INSERT INTO tbl VALUES(200, 0, 0, 0); -- 1 SELECT * FROM log; UPDATE log SET a = 0; } } {1 0 1} execsql { DROP TABLE tbl; DROP TABLE log; } # Simple cascaded trigger execsql { CREATE TABLE tblA(a, b); CREATE TABLE tblB(a, b); CREATE TABLE tblC(a, b); CREATE TRIGGER tr1 BEFORE INSERT ON tblA BEGIN INSERT INTO tblB values(new.a, new.b); END; CREATE TRIGGER tr2 BEFORE INSERT ON tblB BEGIN INSERT INTO tblC values(new.a, new.b); END; } do_test trig-4.1 { execsql { INSERT INTO tblA values(1, 2); SELECT * FROM tblA; SELECT * FROM tblB; SELECT * FROM tblC; } } {1 2 1 2 1 2} execsql { DROP TABLE tblA; DROP TABLE tblB; DROP TABLE tblC; } # Simple recursive trigger execsql { CREATE TABLE tbl(a, b, c); CREATE TRIGGER tbl_trig BEFORE INSERT ON tbl BEGIN INSERT INTO tbl VALUES (new.a, new.b, new.c); END; } do_test trig-4.2 { execsql { INSERT INTO tbl VALUES (1, 2, 3); select * from tbl; } } {1 2 3 1 2 3} execsql { DROP TABLE tbl; } # 5. execsql { CREATE TABLE tbl(a, b, c); CREATE TRIGGER tbl_trig BEFORE INSERT ON tbl BEGIN INSERT INTO tbl VALUES (1, 2, 3); INSERT INTO tbl VALUES (2, 2, 3); UPDATE tbl set b = 10 WHERE a = 1; DELETE FROM tbl WHERE a = 1; DELETE FROM tbl; END; } do_test trig-5 { execsql { INSERT INTO tbl VALUES(100, 200, 300); } db changes } {1} execsql { DROP TABLE tbl; } # Handling of ON CONFLICT by INSERT statements inside triggers execsql { CREATE TABLE tbl (a primary key, b, c); CREATE TRIGGER ai_tbl AFTER INSERT ON tbl BEGIN INSERT OR IGNORE INTO tbl values (new.a, 0, 0); END; } do_test trig-6.1a { execsql { BEGIN; INSERT INTO tbl values (1, 2, 3); SELECT * from tbl; } } {1 2 3} do_test trig-6.1b { catchsql { INSERT OR ABORT INTO tbl values (2, 2, 3); } } {1 {constraint failed}} do_test trig-6.1c { execsql { SELECT * from tbl; } } {1 2 3} do_test trig-6.1d { catchsql { INSERT OR FAIL INTO tbl values (2, 2, 3); } } {1 {constraint failed}} do_test trig-6.1e { execsql { SELECT * from tbl; } } {1 2 3 2 2 3} do_test trig-6.1f { execsql { INSERT OR REPLACE INTO tbl values (2, 2, 3); SELECT * from tbl; } } {1 2 3 2 0 0} do_test trig-6.1g { catchsql { INSERT OR ROLLBACK INTO tbl values (3, 2, 3); } } {1 {constraint failed}} do_test trig-6.1h { execsql { SELECT * from tbl; } } {} # Handling of ON CONFLICT by UPDATE statements inside triggers execsql { INSERT INTO tbl values (4, 2, 3); INSERT INTO tbl values (6, 3, 4); CREATE TRIGGER au_tbl AFTER UPDATE ON tbl BEGIN UPDATE OR IGNORE tbl SET a = new.a, c = 10; END; } do_test trig-6.2a { execsql { BEGIN; UPDATE tbl SET a = 1 WHERE a = 4; SELECT * from tbl; } } {1 2 10 6 3 4} do_test trig-6.2b { catchsql { UPDATE OR ABORT tbl SET a = 4 WHERE a = 1; } } {1 {constraint failed}} do_test trig-6.2c { execsql { SELECT * from tbl; } } {1 2 10 6 3 4} do_test trig-6.2d { catchsql { UPDATE OR FAIL tbl SET a = 4 WHERE a = 1; } } {1 {constraint failed}} do_test trig-6.2e { execsql { SELECT * from tbl; } } {4 2 10 6 3 4} do_test trig-6.2f { execsql { UPDATE OR REPLACE tbl SET a = 1 WHERE a = 4; SELECT * from tbl; } } {1 3 10} execsql { INSERT INTO tbl VALUES (2, 3, 4); } do_test trig-6.2g { catchsql { UPDATE OR ROLLBACK tbl SET a = 4 WHERE a = 1; } } {1 {constraint failed}} do_test trig-6.2h { execsql { SELECT * from tbl; } } {4 2 3 6 3 4} execsql { DROP TABLE tbl; } # 7. Triggers on views execsql { CREATE TABLE ab(a, b); CREATE TABLE cd(c, d); INSERT INTO ab VALUES (1, 2); INSERT INTO ab VALUES (0, 0); INSERT INTO cd VALUES (3, 4); CREATE TABLE tlog(ii INTEGER PRIMARY KEY, olda, oldb, oldc, oldd, newa, newb, newc, newd); CREATE VIEW abcd AS SELECT a, b, c, d FROM ab, cd; CREATE TRIGGER before_update BEFORE UPDATE ON abcd BEGIN INSERT INTO tlog VALUES(NULL, old.a, old.b, old.c, old.d, new.a, new.b, new.c, new.d); END; CREATE TRIGGER after_update AFTER UPDATE ON abcd BEGIN INSERT INTO tlog VALUES(NULL, old.a, old.b, old.c, old.d, new.a, new.b, new.c, new.d); END; CREATE TRIGGER before_delete BEFORE DELETE ON abcd BEGIN INSERT INTO tlog VALUES(NULL, old.a, old.b, old.c, old.d, 0, 0, 0, 0); END; CREATE TRIGGER after_delete AFTER DELETE ON abcd BEGIN INSERT INTO tlog VALUES(NULL, old.a, old.b, old.c, old.d, 0, 0, 0, 0); END; CREATE TRIGGER before_insert BEFORE INSERT ON abcd BEGIN INSERT INTO tlog VALUES(NULL, 0, 0, 0, 0, new.a, new.b, new.c, new.d); END; CREATE TRIGGER after_insert AFTER INSERT ON abcd BEGIN INSERT INTO tlog VALUES(NULL, 0, 0, 0, 0, new.a, new.b, new.c, new.d); END; } do_test trig-7 { execsql { UPDATE abcd SET a = 100, b = 5*5 WHERE a = 1; DELETE FROM abcd WHERE a = 1; INSERT INTO abcd VALUES(10, 20, 30, 40); SELECT * FROM tlog; } } [ list 1 1 2 3 4 100 25 3 4 \ 2 1 2 3 4 100 25 3 4 \ 3 1 2 3 4 0 0 0 0 4 1 2 3 4 0 0 0 0 \ 5 0 0 0 0 10 20 30 40 6 0 0 0 0 10 20 30 40 ] finish_test |
Changes to www/lang.tcl.
1 2 3 | # # Run this Tcl script to generate the sqlite.html file. # | | | 1 2 3 4 5 6 7 8 9 10 11 | # # Run this Tcl script to generate the sqlite.html file. # set rcsid {$Id: lang.tcl,v 1.34 2002/05/15 08:30:15 danielk1977 Exp $} puts {<html> <head> <title>Query Language Understood By SQLite</title> </head> <body bgcolor=white> <h1 align=center> |
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50 51 52 53 54 55 56 57 58 59 60 61 62 63 | {EXPLAIN explain} {expression expr} {{BEGIN TRANSACTION} transaction} {PRAGMA pragma} {{ON CONFLICT clause} conflict} {{CREATE VIEW} createview} {{DROP VIEW} dropview} }] { puts "<li><a href=\"#[lindex $section 1]\">[lindex $section 0]</a></li>" } puts {</ul></p> <p>Details on the implementation of each command are provided in the sequel.</p> | > > | 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 | {EXPLAIN explain} {expression expr} {{BEGIN TRANSACTION} transaction} {PRAGMA pragma} {{ON CONFLICT clause} conflict} {{CREATE VIEW} createview} {{DROP VIEW} dropview} {{CREATE TRIGGER} createtrigger} {{DROP TRIGGER} droptrigger} }] { puts "<li><a href=\"#[lindex $section 1]\">[lindex $section 0]</a></li>" } puts {</ul></p> <p>Details on the implementation of each command are provided in the sequel.</p> |
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1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 | table or index then it is suppose to clean up the named table or index. In version 1.0 of SQLite, the VACUUM command would invoke <b>gdbm_reorganize()</b> to clean up the backend database file. Beginning with version 2.0 of SQLite, GDBM is no longer used for the database backend and VACUUM has become a no-op. </p> } puts { <p><hr /></p> <p><a href="index.html"><img src="/goback.jpg" border=0 /> Back to the SQLite Home Page</a> </p> </body></html>} | > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > | 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 | table or index then it is suppose to clean up the named table or index. In version 1.0 of SQLite, the VACUUM command would invoke <b>gdbm_reorganize()</b> to clean up the backend database file. Beginning with version 2.0 of SQLite, GDBM is no longer used for the database backend and VACUUM has become a no-op. </p> } Section {CREATE TRIGGER} createtrigger Syntax {sql-statement} { CREATE TRIGGER <trigger-name> [ BEFORE | AFTER ] <database-event> <trigger-action> } Syntax {database-event} { DELETE | INSERT | UPDATE | UPDATE OF <column-list> ON <table-name> } Syntax {trigger-action} { [ FOR EACH ROW ] [ WHEN <expression> ] BEGIN <trigger-step> ; [ <trigger-step> ; ]* END } Syntax {trigger-step} { <update-statement> | <insert-statement> | <delete-statement> | <select-statement> } puts { <p>The CREATE TRIGGER statement is used to add triggers to the database schema. Triggers are database operations (the <i>trigger-action</i>) that are automatically performed when a specified database event (the <i>database-event</i>) occurs. </p> <p>A trigger may be specified to fire whenever a DELETE, INSERT or UPDATE of a particular database table occurs, or whenever an UPDATE of one or more specified columns of a table are updated.</p> <p>At this time SQLite supports only FOR EACH ROW triggers, not FOR EACH STATEMENT triggers. Hence explicitly specifying FOR EACH ROW is optional. FOR EACH ROW implies that the SQL statements specified as <i>trigger-steps</i> may be executed (depending on the WHEN clause) for each database row being inserted, updated or deleted by the statement causing the trigger to fire.</p> <p>Both the WHEN clause and the <i>trigger-steps</i> may access elements of the row being inserted, deleted or updated using references of the form "NEW.<i>column-name</i>" and "OLD.<i>column-name</i>", where <i>column-name</i> is the name of a column from the table that the trigger is associated with. OLD and NEW references may only be used in triggers on <i>trigger-event</i>s for which they are relevant, as follows:</p> <table border=0 cellpadding=10> <tr> <td valign="top" align="right" width=120><i>INSERT</i></td> <td valign="top">NEW references are valid</td> </tr> <tr> <td valign="top" align="right" width=120><i>UPDATE</i></td> <td valign="top">NEW and OLD references are valid</td> </tr> <tr> <td valign="top" align="right" width=120><i>DELETE</i></td> <td valign="top">OLD references are valid</td> </tr> </table> </p> <p>If a WHEN clause is supplied, the SQL statements specified as <i>trigger-steps</i> are only executed for rows for which the WHEN clause is true. If no WHEN clause is supplied, the SQL statements are executed for all rows.</p> <p>The specified <i>trigger-time</i> determines when the <i>trigger-steps</i> will be executed relative to the insertion, modification or removal of the associated row.</p> <p>An ON CONFLICT clause may be specified as part of an UPDATE or INSERT <i>trigger-step</i>. However if an ON CONFLICT clause is specified as part of the statement causing the trigger to fire, then this conflict handling policy is used instead.</p> <p>Triggers are automatically dropped when the table that they are associated with is dropped.</p> <p>Triggers may be created on views, as well as ordinary tables. If one or more INSERT, DELETE or UPDATE triggers are defined on a view, then it is not an error to execute an INSERT, DELETE or UPDATE statement on the view, respectively. Thereafter, executing an INSERT, DELETE or UPDATE on the view causes the associated triggers to fire. The real tables underlying the view are not modified (except possibly explicitly, by a trigger program).</p> <p><b>Example:</b></p> <p>Assuming that customer records are stored in the "customers" table, and that order records are stored in the "orders" table, the following trigger ensures that all associated orders are redirected when a customer changes his or her address:</p> } Example { CREATE TRIGGER update_customer_address UPDATE OF address ON customers BEGIN UPDATE orders SET address = new.address WHERE customer_name = old.name; END; } puts { <p>With this trigger installed, executing the statement:</p> } Example { UPDATE customers SET address = '1 Main St.' WHERE name = 'Jack Jones'; } puts { <p>causes the following to be automatically executed:</p> } Example { UPDATE orders SET address = '1 Main St.' WHERE customer_name = 'Jack Jones'; } Section {DROP TRIGGER} droptrigger Syntax {sql-statement} { DROP TRIGGER <trigger-name> } puts { <p>Used to drop a trigger from the database schema. Note that triggers are automatically dropped when the associated table is dropped.</p> } puts { <p><hr /></p> <p><a href="index.html"><img src="/goback.jpg" border=0 /> Back to the SQLite Home Page</a> </p> </body></html>} |