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Overview
Comment: | Add the experimental dbdata extension. |
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Downloads: | Tarball | ZIP archive |
Timelines: | family | ancestors | descendants | both | dbdata |
Files: | files | file ages | folders |
SHA3-256: |
a3ab58832935e1399ecc7e4d8daefa3a |
User & Date: | dan 2019-04-17 21:17:22.795 |
Context
2019-04-18
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21:14 | Add the sqlite_dbptr virtual table to the dbdata extension. For querying the links between b-tree pages. (check-in: 3213a15f21 user: dan tags: dbdata) | |
2019-04-17
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21:17 | Add the experimental dbdata extension. (check-in: a3ab588329 user: dan tags: dbdata) | |
11:34 | Faster and smaller implementation of sqlite3StrICmp(). (check-in: 7ac500fb5a user: drh tags: trunk) | |
Changes
Added ext/misc/dbdata.c.
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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 contains an implementation of the eponymous "sqlite_dbdata" ** virtual table. sqlite_dbdata is used to extract data directly from a ** database b-tree page and its associated overflow pages, bypassing the b-tree ** layer. The table schema is equivalent to: ** ** CREATE TABLE sqlite_dbdata( ** pgno INTEGER, ** cell INTEGER, ** field INTEGER, ** value ANY, ** schema TEXT HIDDEN ** ); ** ** Each page of the database is inspected. If it cannot be interpreted as a ** b-tree page, or if it is a b-tree page containing 0 entries, the ** sqlite_dbdata table contains no rows for that page. Otherwise, the table ** contains one row for each field in the record associated with each ** cell on the page. For intkey b-trees, the key value is stored in field -1. ** ** For example, for the database: ** ** CREATE TABLE t1(a, b); -- root page is page 2 ** INSERT INTO t1(rowid, a, b) VALUES(5, 'v', 'five'); ** INSERT INTO t1(rowid, a, b) VALUES(10, 'x', 'ten'); ** ** the sqlite_dbdata table contains, as well as from entries related to ** page 1, content equivalent to: ** ** INSERT INTO sqlite_dbdata(pgno, cell, field, value) VALUES ** (2, 0, -1, 5 ), ** (2, 0, 0, 'v' ), ** (2, 0, 1, 'five'), ** (2, 1, -1, 10 ), ** (2, 1, 0, 'x' ), ** (2, 1, 1, 'ten' ); ** ** If database corruption is encountered, this module does not report an ** error. Instead, it attempts to extract as much data as possible and ** ignores the corruption. ** ** This module requires that the "sqlite_dbpage" eponymous virtual table be ** available. */ #if !defined(SQLITEINT_H) #include "sqlite3ext.h" typedef unsigned char u8; typedef unsigned int u32; #endif SQLITE_EXTENSION_INIT1 #include <string.h> #include <assert.h> typedef struct DbdataTable DbdataTable; typedef struct DbdataCursor DbdataCursor; /* A cursor for the sqlite_dbdata table */ struct DbdataCursor { sqlite3_vtab_cursor base; /* Base class. Must be first */ sqlite3_stmt *pStmt; /* For fetching database pages */ int iPgno; /* Current page number */ u8 *aPage; /* Buffer containing page */ int nPage; /* Size of aPage[] in bytes */ int nCell; /* Number of cells on aPage[] */ int iCell; /* Current cell number */ u8 *pRec; /* Buffer containing current record */ int nRec; /* Size of pRec[] in bytes */ int nField; /* Number of fields in pRec */ int iField; /* Current field number */ sqlite3_int64 iIntkey; /* Integer key value */ sqlite3_int64 iRowid; }; /* The sqlite_dbdata table */ struct DbdataTable { sqlite3_vtab base; /* Base class. Must be first */ sqlite3 *db; /* The database connection */ }; #define DBDATA_COLUMN_PGNO 0 #define DBDATA_COLUMN_CELL 1 #define DBDATA_COLUMN_FIELD 2 #define DBDATA_COLUMN_VALUE 3 #define DBDATA_COLUMN_SCHEMA 4 #define DBDATA_SCHEMA \ "CREATE TABLE x(" \ " pgno INTEGER," \ " cell INTEGER," \ " field INTEGER," \ " value ANY," \ " schema TEXT HIDDEN" \ ")" /* ** Connect to the sqlite_dbdata virtual table. */ static int dbdataConnect( sqlite3 *db, void *pAux, int argc, const char *const*argv, sqlite3_vtab **ppVtab, char **pzErr ){ DbdataTable *pTab = 0; int rc = sqlite3_declare_vtab(db, DBDATA_SCHEMA); if( rc==SQLITE_OK ){ pTab = (DbdataTable*)sqlite3_malloc64(sizeof(DbdataTable)); if( pTab==0 ){ rc = SQLITE_NOMEM; }else{ memset(pTab, 0, sizeof(DbdataTable)); pTab->db = db; } } *ppVtab = (sqlite3_vtab*)pTab; return rc; } /* ** Disconnect from or destroy a dbdata virtual table. */ static int dbdataDisconnect(sqlite3_vtab *pVtab){ sqlite3_free(pVtab); return SQLITE_OK; } /* ** ** This function interprets two types of constraints: ** ** schema=? ** pgno=? ** ** If neither are present, idxNum is set to 0. If schema=? is present, ** the 0x01 bit in idxNum is set. If pgno=? is present, the 0x02 bit ** in idxNum is set. ** ** If both parameters are present, schema is in position 0 and pgno in ** position 1. */ static int dbdataBestIndex(sqlite3_vtab *tab, sqlite3_index_info *pIdxInfo){ int i; int iSchema = -1; int iPgno = -1; for(i=0; i<pIdxInfo->nConstraint; i++){ struct sqlite3_index_constraint *p = &pIdxInfo->aConstraint[i]; if( p->op==SQLITE_INDEX_CONSTRAINT_EQ ){ if( p->iColumn==DBDATA_COLUMN_SCHEMA ){ if( p->usable==0 ) return SQLITE_CONSTRAINT; iSchema = i; } if( p->iColumn==DBDATA_COLUMN_PGNO && p->usable ){ iPgno = i; } } } if( iSchema>=0 ){ pIdxInfo->aConstraintUsage[iSchema].argvIndex = 1; pIdxInfo->aConstraintUsage[iSchema].omit = 1; } if( iPgno>=0 ){ pIdxInfo->aConstraintUsage[iPgno].argvIndex = 1 + (iSchema>=0); pIdxInfo->aConstraintUsage[iPgno].omit = 1; } pIdxInfo->idxNum = (iSchema>=0 ? 0x01 : 0x00) | (iPgno>=0 ? 0x02 : 0x00); return SQLITE_OK; } /* ** Open a new dbdata cursor. */ static int dbdataOpen(sqlite3_vtab *pVTab, sqlite3_vtab_cursor **ppCursor){ DbdataCursor *pCsr; pCsr = (DbdataCursor*)sqlite3_malloc64(sizeof(DbdataCursor)); if( pCsr==0 ){ return SQLITE_NOMEM; }else{ memset(pCsr, 0, sizeof(DbdataCursor)); pCsr->base.pVtab = pVTab; } *ppCursor = (sqlite3_vtab_cursor *)pCsr; return SQLITE_OK; } static void dbdataResetCursor(DbdataCursor *pCsr){ sqlite3_finalize(pCsr->pStmt); pCsr->pStmt = 0; pCsr->iPgno = 1; pCsr->iCell = 0; pCsr->iField = 0; } /* ** Close a dbdata cursor. */ static int dbdataClose(sqlite3_vtab_cursor *pCursor){ DbdataCursor *pCsr = (DbdataCursor*)pCursor; dbdataResetCursor(pCsr); sqlite3_free(pCsr); return SQLITE_OK; } /* Decode big-endian integers */ static unsigned int get_uint16(unsigned char *a){ return (a[0]<<8)|a[1]; } static unsigned int get_uint32(unsigned char *a){ return (a[0]<<24)|(a[1]<<16)|(a[2]<<8)|a[3]; } static int dbdataLoadPage( DbdataCursor *pCsr, u32 pgno, u8 **ppPage, int *pnPage ){ int rc2; int rc = SQLITE_OK; sqlite3_stmt *pStmt = pCsr->pStmt; *ppPage = 0; *pnPage = 0; sqlite3_bind_int64(pStmt, 2, pgno); if( SQLITE_ROW==sqlite3_step(pStmt) ){ int nCopy = sqlite3_column_bytes(pStmt, 0); u8 *pPage = (u8*)sqlite3_malloc64(nCopy); if( pPage==0 ){ rc = SQLITE_NOMEM; }else{ const u8 *pCopy = sqlite3_column_blob(pStmt, 0); memcpy(pPage, pCopy, nCopy); *ppPage = pPage; *pnPage = nCopy; } } rc2 = sqlite3_reset(pStmt); if( *ppPage==0 ) rc = rc2; return rc; } /* ** Read a varint. Put the value in *pVal and return the number of bytes. */ static int dbdataGetVarint(const u8 *z, sqlite3_int64 *pVal){ sqlite3_int64 v = 0; int i; for(i=0; i<8; i++){ v = (v<<7) + (z[i]&0x7f); if( (z[i]&0x80)==0 ){ *pVal = v; return i+1; } } v = (v<<8) + (z[i]&0xff); *pVal = v; return 9; } /* ** Move a dbdata cursor to the next entry in the file. */ static int dbdataNext(sqlite3_vtab_cursor *pCursor){ DbdataCursor *pCsr = (DbdataCursor *)pCursor; pCsr->iRowid++; while( 1 ){ int rc; if( pCsr->aPage==0 ){ rc = dbdataLoadPage(pCsr, pCsr->iPgno, &pCsr->aPage, &pCsr->nPage); if( rc!=SQLITE_OK ) return rc; pCsr->iCell = 0; pCsr->nCell = get_uint16(&pCsr->aPage[pCsr->iPgno==1 ? 103 : 3]); } /* If there is no record loaded, load it now. */ if( pCsr->pRec==0 ){ int iOff = (pCsr->iPgno==1 ? 100 : 0); int bHasRowid = 0; int nPointer = 0; sqlite3_int64 nPayload = 0; sqlite3_int64 nHdr = 0; int iHdr; int U, X; int nLocal; switch( pCsr->aPage[iOff] ){ case 0x02: nPointer = 4; break; case 0x0a: break; case 0x0d: bHasRowid = 1; break; default: pCsr->iCell = pCsr->nCell; break; } if( pCsr->iCell>=pCsr->nCell ){ sqlite3_free(pCsr->aPage); pCsr->aPage = 0; return SQLITE_OK; } iOff += 8 + nPointer + pCsr->iCell*2; iOff = get_uint16(&pCsr->aPage[iOff]); /* For an interior node cell, skip past the child-page number */ iOff += nPointer; /* Load the "byte of payload including overflow" field */ iOff += dbdataGetVarint(&pCsr->aPage[iOff], &nPayload); /* If this is a leaf intkey cell, load the rowid */ if( bHasRowid ){ iOff += dbdataGetVarint(&pCsr->aPage[iOff], &pCsr->iIntkey); } /* Allocate space for payload */ pCsr->pRec = (u8*)sqlite3_malloc64(nPayload); if( pCsr->pRec==0 ) return SQLITE_NOMEM; pCsr->nRec = nPayload; U = pCsr->nPage; if( bHasRowid ){ X = U-35; }else{ X = ((U-12)*64/255)-23; } if( nPayload<=X ){ nLocal = nPayload; }else{ int M, K; M = ((U-12)*32/255)-23; K = M+((nPayload-M)%(U-4)); if( K<=X ){ nLocal = K; }else{ nLocal = M; } } /* Load the nLocal bytes of payload */ memcpy(pCsr->pRec, &pCsr->aPage[iOff], nLocal); iOff += nLocal; /* Load content from overflow pages */ if( nPayload>nLocal ){ sqlite3_int64 nRem = nPayload - nLocal; u32 pgnoOvfl = get_uint32(&pCsr->aPage[iOff]); while( nRem>0 ){ u8 *aOvfl = 0; int nOvfl = 0; int nCopy; rc = dbdataLoadPage(pCsr, pgnoOvfl, &aOvfl, &nOvfl); assert( rc!=SQLITE_OK || nOvfl==pCsr->nPage ); if( rc!=SQLITE_OK ) return rc; nCopy = U-4; if( nCopy>nRem ) nCopy = nRem; memcpy(&pCsr->pRec[nPayload-nRem], &aOvfl[4], nCopy); nRem -= nCopy; sqlite3_free(aOvfl); } } /* Figure out how many fields in the record */ pCsr->nField = 0; iHdr = dbdataGetVarint(pCsr->pRec, &nHdr); while( iHdr<nHdr ){ sqlite3_int64 iDummy; iHdr += dbdataGetVarint(&pCsr->pRec[iHdr], &iDummy); pCsr->nField++; } pCsr->iField = (bHasRowid ? -2 : -1); } pCsr->iField++; if( pCsr->iField<pCsr->nField ) return SQLITE_OK; /* Advance to the next cell. The next iteration of the loop will load ** the record and so on. */ sqlite3_free(pCsr->pRec); pCsr->pRec = 0; pCsr->iCell++; } assert( !"can't get here" ); return SQLITE_OK; } /* We have reached EOF if previous sqlite3_step() returned ** anything other than SQLITE_ROW; */ static int dbdataEof(sqlite3_vtab_cursor *pCursor){ DbdataCursor *pCsr = (DbdataCursor*)pCursor; return pCsr->aPage==0; } /* Position a cursor back to the beginning. */ static int dbdataFilter( sqlite3_vtab_cursor *pCursor, int idxNum, const char *idxStr, int argc, sqlite3_value **argv ){ DbdataCursor *pCsr = (DbdataCursor*)pCursor; DbdataTable *pTab = (DbdataTable*)pCursor->pVtab; int rc; const char *zSchema = "main"; dbdataResetCursor(pCsr); assert( pCsr->iPgno==1 ); if( idxNum & 0x01 ){ zSchema = sqlite3_value_text(argv[0]); } if( idxNum & 0x02 ){ pCsr->iPgno = sqlite3_value_int(argv[(idxNum & 0x01)]); } rc = sqlite3_prepare_v2(pTab->db, "SELECT data FROM sqlite_dbpage(?) WHERE pgno=?", -1, &pCsr->pStmt, 0 ); if( rc==SQLITE_OK ){ rc = sqlite3_bind_text(pCsr->pStmt, 1, zSchema, -1, SQLITE_TRANSIENT); } if( rc==SQLITE_OK ){ rc = dbdataNext(pCursor); } return rc; } static int dbdataValueBytes(int eType){ switch( eType ){ case 0: case 8: case 9: case 10: case 11: return 0; case 1: return 1; case 2: return 2; case 3: return 3; case 4: return 4; case 5: return 6; case 6: case 7: return 8; default: return ((eType-12) / 2); } } static void dbdataValue(sqlite3_context *pCtx, int eType, u8 *pData){ switch( eType ){ case 0: case 10: case 11: sqlite3_result_null(pCtx); break; case 8: sqlite3_result_int(pCtx, 0); break; case 9: sqlite3_result_int(pCtx, 1); break; case 1: case 2: case 3: case 4: case 5: case 6: case 7: { sqlite3_uint64 v = (signed char)pData[0]; pData++; switch( eType ){ case 7: case 6: v = (v<<16) + (pData[0]<<8) + pData[1]; pData += 2; case 5: v = (v<<16) + (pData[0]<<8) + pData[1]; pData += 2; case 4: v = (v<<8) + pData[0]; pData++; case 3: v = (v<<8) + pData[0]; pData++; case 2: v = (v<<8) + pData[0]; pData++; } if( eType==7 ){ double r; memcpy(&r, &v, sizeof(r)); sqlite3_result_double(pCtx, r); }else{ sqlite3_result_int64(pCtx, (sqlite3_int64)v); } break; } default: { int n = ((eType-12) / 2); if( eType % 2 ){ sqlite3_result_text(pCtx, pData, n, SQLITE_TRANSIENT); }else{ sqlite3_result_blob(pCtx, pData, n, SQLITE_TRANSIENT); } } } } /* Return a column for the sqlite_dbdata table */ static int dbdataColumn( sqlite3_vtab_cursor *pCursor, sqlite3_context *ctx, int i ){ DbdataCursor *pCsr = (DbdataCursor*)pCursor; switch( i ){ case DBDATA_COLUMN_PGNO: sqlite3_result_int64(ctx, pCsr->iPgno); break; case DBDATA_COLUMN_CELL: sqlite3_result_int(ctx, pCsr->iCell); break; case DBDATA_COLUMN_FIELD: sqlite3_result_int(ctx, pCsr->iField); break; case DBDATA_COLUMN_VALUE: { if( pCsr->iField<0 ){ sqlite3_result_int64(ctx, pCsr->iIntkey); }else{ int iHdr; sqlite3_int64 iType; sqlite3_int64 iOff; int i; iHdr = dbdataGetVarint(pCsr->pRec, &iOff); for(i=0; i<pCsr->iField; i++){ iHdr += dbdataGetVarint(&pCsr->pRec[iHdr], &iType); iOff += dbdataValueBytes(iType); } dbdataGetVarint(&pCsr->pRec[iHdr], &iType); dbdataValue(ctx, iType, &pCsr->pRec[iOff]); } break; } } return SQLITE_OK; } /* Return the ROWID for the sqlite_dbdata table */ static int dbdataRowid(sqlite3_vtab_cursor *pCursor, sqlite_int64 *pRowid){ DbdataCursor *pCsr = (DbdataCursor*)pCursor; *pRowid = pCsr->iRowid; return SQLITE_OK; } /* ** Invoke this routine to register the "sqlite_dbdata" virtual table module */ static int sqlite3DbdataRegister(sqlite3 *db){ static sqlite3_module dbdata_module = { 0, /* iVersion */ 0, /* xCreate */ dbdataConnect, /* xConnect */ dbdataBestIndex, /* xBestIndex */ dbdataDisconnect, /* xDisconnect */ 0, /* xDestroy */ dbdataOpen, /* xOpen - open a cursor */ dbdataClose, /* xClose - close a cursor */ dbdataFilter, /* xFilter - configure scan constraints */ dbdataNext, /* xNext - advance a cursor */ dbdataEof, /* xEof - check for end of scan */ dbdataColumn, /* xColumn - read data */ dbdataRowid, /* xRowid - read data */ 0, /* xUpdate */ 0, /* xBegin */ 0, /* xSync */ 0, /* xCommit */ 0, /* xRollback */ 0, /* xFindMethod */ 0, /* xRename */ 0, /* xSavepoint */ 0, /* xRelease */ 0, /* xRollbackTo */ 0 /* xShadowName */ }; return sqlite3_create_module(db, "sqlite_dbdata", &dbdata_module, 0); } #ifdef _WIN32 __declspec(dllexport) #endif int sqlite3_dbdata_init( sqlite3 *db, char **pzErrMsg, const sqlite3_api_routines *pApi ){ SQLITE_EXTENSION_INIT2(pApi); return sqlite3DbdataRegister(db); } |
Added test/dbdata.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 | # 2019-04-11 # # 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 implements regression tests for SQLite library. The # focus of this file is testing the sqlite_dbpage virtual table. # set testdir [file dirname $argv0] source $testdir/tester.tcl set testprefix dbdata ifcapable !vtab||!compound { finish_test return } db enable_load_extension 1 if { [catch { db eval { SELECT load_extension('../dbdata') } }] } { finish_test return } do_execsql_test 1.0 { CREATE TABLE T1(a, b); INSERT INTO t1(rowid, a ,b) VALUES(5, 'v', 'five'); INSERT INTO t1(rowid, a, b) VALUES(10, 'x', 'ten'); } do_execsql_test 1.1 { SELECT pgno, cell, field, quote(value) FROM sqlite_dbdata WHERE pgno=2; } { 2 0 -1 5 2 0 0 'v' 2 0 1 'five' 2 1 -1 10 2 1 0 'x' 2 1 1 'ten' } set big [string repeat big 2000] do_execsql_test 1.2 { INSERT INTO t1 VALUES(NULL, $big); SELECT value FROM sqlite_dbdata WHERE pgno=2 AND cell=2 AND field=1; } $big finish_test |