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Overview
Comment: | Fix the sqlite3_dbpage virtual table so that it can read and write from any attached database. |
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Downloads: | Tarball | ZIP archive |
Timelines: | family | ancestors | descendants | both | trunk |
Files: | files | file ages | folders |
SHA3-256: |
d4f893e1ae53a0445939ea2920af87d2 |
User & Date: | drh 2017-10-25 19:18:33.009 |
Context
2017-10-26
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15:21 | Fix a bug causing "make amalgmation-autoconf" to create an invalid package if either the current or parent directory contains a file named install.sh or install-sh. (check-in: e1faa78594 user: dan tags: trunk) | |
2017-10-25
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23:28 | Use extra locks to prevent a readonly_shm=1 process from connecting to a WAL-mode database if there are no writers. (check-in: 35d979082b user: drh tags: readonly-wal-recovery) | |
19:18 | Fix the sqlite3_dbpage virtual table so that it can read and write from any attached database. (check-in: d4f893e1ae user: drh tags: trunk) | |
18:17 | Add tests cases and fix minor issues in the rtreecheck() function. (check-in: d6130cd226 user: dan tags: trunk) | |
Changes
Changes to src/dbpage.c.
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38 39 40 41 42 43 44 45 46 47 48 49 | 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 | + + + + + - + - - - - + + + + + + - - - - - - - - - - - - - - - - - + + + + + + + + + + + + + + + + + + + + + + + + + + + + + - + + + - - + + + + | typedef struct DbpageTable DbpageTable; typedef struct DbpageCursor DbpageCursor; struct DbpageCursor { sqlite3_vtab_cursor base; /* Base class. Must be first */ int pgno; /* Current page number */ int mxPgno; /* Last page to visit on this scan */ Pager *pPager; /* Pager being read/written */ DbPage *pPage1; /* Page 1 of the database */ int iDb; /* Index of database to analyze */ int szPage; /* Size of each page in bytes */ }; struct DbpageTable { sqlite3_vtab base; /* Base class. Must be first */ sqlite3 *db; /* The database */ }; |
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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 | 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 | + + + + + + + + + + + + - + + + + + + + + + + + + + + + + + - - - - - + + + + + + - + - + - - + - + - + | } /* ** Close a dbpagevfs cursor. */ static int dbpageClose(sqlite3_vtab_cursor *pCursor){ DbpageCursor *pCsr = (DbpageCursor *)pCursor; if( pCsr->pPage1 ) sqlite3PagerUnrefPageOne(pCsr->pPage1); sqlite3_free(pCsr); return SQLITE_OK; } /* ** Move a dbpagevfs cursor to the next entry in the file. */ static int dbpageNext(sqlite3_vtab_cursor *pCursor){ int rc = SQLITE_OK; DbpageCursor *pCsr = (DbpageCursor *)pCursor; pCsr->pgno++; return rc; } static int dbpageEof(sqlite3_vtab_cursor *pCursor){ DbpageCursor *pCsr = (DbpageCursor *)pCursor; return pCsr->pgno > pCsr->mxPgno; } /* ** idxNum: ** ** 0 schema=main, full table scan ** 1 schema=main, pgno=?1 ** 2 schema=?1, full table scan ** 3 schema=?1, pgno=?2 ** ** idxStr is not used */ static int dbpageFilter( sqlite3_vtab_cursor *pCursor, int idxNum, const char *idxStr, int argc, sqlite3_value **argv ){ DbpageCursor *pCsr = (DbpageCursor *)pCursor; DbpageTable *pTab = (DbpageTable *)pCursor->pVtab; int rc = SQLITE_OK; sqlite3 *db = pTab->db; |
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251 252 253 254 255 256 257 258 259 260 261 262 263 | 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 | + + + + + - - - - + + + + + + + + + + + + - + + - + - + + + + + + + + + + + + + + + + + - + | sqlite_int64 *pRowid ){ DbpageTable *pTab = (DbpageTable *)pVtab; int pgno; DbPage *pDbPage = 0; int rc = SQLITE_OK; char *zErr = 0; const char *zSchema; int iDb; Btree *pBt; Pager *pPager; int szPage; if( argc==1 ){ zErr = "cannot delete"; goto update_fail; } pgno = sqlite3_value_int(argv[0]); |
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Changes to test/dbpage.test.
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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 | 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 | + + + + + + + - - - + + + + + + + + + + + + + + + + + + | } {4 X'0D00000016'} do_execsql_test 140 { SELECT pgno, quote(substr(data,1,5)) FROM sqlite_dbpage WHERE pgno=5; } {} do_execsql_test 150 { SELECT pgno, quote(substr(data,1,5)) FROM sqlite_dbpage WHERE pgno=0; } {} do_execsql_test 160 { ATTACH ':memory:' AS aux1; PRAGMA aux1.page_size=4096; CREATE TABLE aux1.t2(a,b,c); INSERT INTO t2 VALUES(11,12,13); SELECT pgno, quote(substr(data,1,5)) FROM sqlite_dbpage('aux1'); } {1 X'53514C6974' 2 X'0D00000001'} do_execsql_test 200 { CREATE TEMP TABLE saved_content(x); INSERT INTO saved_content(x) SELECT data FROM sqlite_dbpage WHERE pgno=4; UPDATE sqlite_dbpage SET data=zeroblob(4096) WHERE pgno=4; } {} do_catchsql_test 210 { PRAGMA integrity_check; } {1 {database disk image is malformed}} do_execsql_test 220 { SELECT pgno, quote(substr(data,1,5)) FROM sqlite_dbpage('main') ORDER BY pgno; } {1 X'53514C6974' 2 X'0500000001' 3 X'0D0000004E' 4 X'0000000000'} do_execsql_test 230 { UPDATE sqlite_dbpage SET data=(SELECT x FROM saved_content) WHERE pgno=4; } {} do_catchsql_test 230 { PRAGMA integrity_check; } {0 ok} |