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| 1 /* | |
| 2 ** 2011 Jan 27 | |
| 3 ** | |
| 4 ** The author disclaims copyright to this source code. In place of | |
| 5 ** a legal notice, here is a blessing: | |
| 6 ** | |
| 7 ** May you do good and not evil. | |
| 8 ** May you find forgiveness for yourself and forgive others. | |
| 9 ** May you share freely, never taking more than you give. | |
| 10 ** | |
| 11 ****************************************************************************** | |
| 12 ** | |
| 13 */ | |
| 14 #include "fts3Int.h" | |
| 15 #if !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_FTS3) | |
| 16 | |
| 17 #include <string.h> | |
| 18 #include <assert.h> | |
| 19 | |
| 20 typedef struct Fts3auxTable Fts3auxTable; | |
| 21 typedef struct Fts3auxCursor Fts3auxCursor; | |
| 22 | |
| 23 struct Fts3auxTable { | |
| 24 sqlite3_vtab base; /* Base class used by SQLite core */ | |
| 25 Fts3Table *pFts3Tab; | |
| 26 }; | |
| 27 | |
| 28 struct Fts3auxCursor { | |
| 29 sqlite3_vtab_cursor base; /* Base class used by SQLite core */ | |
| 30 Fts3MultiSegReader csr; /* Must be right after "base" */ | |
| 31 Fts3SegFilter filter; | |
| 32 char *zStop; | |
| 33 int nStop; /* Byte-length of string zStop */ | |
| 34 int iLangid; /* Language id to query */ | |
| 35 int isEof; /* True if cursor is at EOF */ | |
| 36 sqlite3_int64 iRowid; /* Current rowid */ | |
| 37 | |
| 38 int iCol; /* Current value of 'col' column */ | |
| 39 int nStat; /* Size of aStat[] array */ | |
| 40 struct Fts3auxColstats { | |
| 41 sqlite3_int64 nDoc; /* 'documents' values for current csr row */ | |
| 42 sqlite3_int64 nOcc; /* 'occurrences' values for current csr row */ | |
| 43 } *aStat; | |
| 44 }; | |
| 45 | |
| 46 /* | |
| 47 ** Schema of the terms table. | |
| 48 */ | |
| 49 #define FTS3_AUX_SCHEMA \ | |
| 50 "CREATE TABLE x(term, col, documents, occurrences, languageid HIDDEN)" | |
| 51 | |
| 52 /* | |
| 53 ** This function does all the work for both the xConnect and xCreate methods. | |
| 54 ** These tables have no persistent representation of their own, so xConnect | |
| 55 ** and xCreate are identical operations. | |
| 56 */ | |
| 57 static int fts3auxConnectMethod( | |
| 58 sqlite3 *db, /* Database connection */ | |
| 59 void *pUnused, /* Unused */ | |
| 60 int argc, /* Number of elements in argv array */ | |
| 61 const char * const *argv, /* xCreate/xConnect argument array */ | |
| 62 sqlite3_vtab **ppVtab, /* OUT: New sqlite3_vtab object */ | |
| 63 char **pzErr /* OUT: sqlite3_malloc'd error message */ | |
| 64 ){ | |
| 65 char const *zDb; /* Name of database (e.g. "main") */ | |
| 66 char const *zFts3; /* Name of fts3 table */ | |
| 67 int nDb; /* Result of strlen(zDb) */ | |
| 68 int nFts3; /* Result of strlen(zFts3) */ | |
| 69 int nByte; /* Bytes of space to allocate here */ | |
| 70 int rc; /* value returned by declare_vtab() */ | |
| 71 Fts3auxTable *p; /* Virtual table object to return */ | |
| 72 | |
| 73 UNUSED_PARAMETER(pUnused); | |
| 74 | |
| 75 /* The user should invoke this in one of two forms: | |
| 76 ** | |
| 77 ** CREATE VIRTUAL TABLE xxx USING fts4aux(fts4-table); | |
| 78 ** CREATE VIRTUAL TABLE xxx USING fts4aux(fts4-table-db, fts4-table); | |
| 79 */ | |
| 80 if( argc!=4 && argc!=5 ) goto bad_args; | |
| 81 | |
| 82 zDb = argv[1]; | |
| 83 nDb = (int)strlen(zDb); | |
| 84 if( argc==5 ){ | |
| 85 if( nDb==4 && 0==sqlite3_strnicmp("temp", zDb, 4) ){ | |
| 86 zDb = argv[3]; | |
| 87 nDb = (int)strlen(zDb); | |
| 88 zFts3 = argv[4]; | |
| 89 }else{ | |
| 90 goto bad_args; | |
| 91 } | |
| 92 }else{ | |
| 93 zFts3 = argv[3]; | |
| 94 } | |
| 95 nFts3 = (int)strlen(zFts3); | |
| 96 | |
| 97 rc = sqlite3_declare_vtab(db, FTS3_AUX_SCHEMA); | |
| 98 if( rc!=SQLITE_OK ) return rc; | |
| 99 | |
| 100 nByte = sizeof(Fts3auxTable) + sizeof(Fts3Table) + nDb + nFts3 + 2; | |
| 101 p = (Fts3auxTable *)sqlite3_malloc(nByte); | |
| 102 if( !p ) return SQLITE_NOMEM; | |
| 103 memset(p, 0, nByte); | |
| 104 | |
| 105 p->pFts3Tab = (Fts3Table *)&p[1]; | |
| 106 p->pFts3Tab->zDb = (char *)&p->pFts3Tab[1]; | |
| 107 p->pFts3Tab->zName = &p->pFts3Tab->zDb[nDb+1]; | |
| 108 p->pFts3Tab->db = db; | |
| 109 p->pFts3Tab->nIndex = 1; | |
| 110 | |
| 111 memcpy((char *)p->pFts3Tab->zDb, zDb, nDb); | |
| 112 memcpy((char *)p->pFts3Tab->zName, zFts3, nFts3); | |
| 113 sqlite3Fts3Dequote((char *)p->pFts3Tab->zName); | |
| 114 | |
| 115 *ppVtab = (sqlite3_vtab *)p; | |
| 116 return SQLITE_OK; | |
| 117 | |
| 118 bad_args: | |
| 119 *pzErr = sqlite3_mprintf("invalid arguments to fts4aux constructor"); | |
| 120 return SQLITE_ERROR; | |
| 121 } | |
| 122 | |
| 123 /* | |
| 124 ** This function does the work for both the xDisconnect and xDestroy methods. | |
| 125 ** These tables have no persistent representation of their own, so xDisconnect | |
| 126 ** and xDestroy are identical operations. | |
| 127 */ | |
| 128 static int fts3auxDisconnectMethod(sqlite3_vtab *pVtab){ | |
| 129 Fts3auxTable *p = (Fts3auxTable *)pVtab; | |
| 130 Fts3Table *pFts3 = p->pFts3Tab; | |
| 131 int i; | |
| 132 | |
| 133 /* Free any prepared statements held */ | |
| 134 for(i=0; i<SizeofArray(pFts3->aStmt); i++){ | |
| 135 sqlite3_finalize(pFts3->aStmt[i]); | |
| 136 } | |
| 137 sqlite3_free(pFts3->zSegmentsTbl); | |
| 138 sqlite3_free(p); | |
| 139 return SQLITE_OK; | |
| 140 } | |
| 141 | |
| 142 #define FTS4AUX_EQ_CONSTRAINT 1 | |
| 143 #define FTS4AUX_GE_CONSTRAINT 2 | |
| 144 #define FTS4AUX_LE_CONSTRAINT 4 | |
| 145 | |
| 146 /* | |
| 147 ** xBestIndex - Analyze a WHERE and ORDER BY clause. | |
| 148 */ | |
| 149 static int fts3auxBestIndexMethod( | |
| 150 sqlite3_vtab *pVTab, | |
| 151 sqlite3_index_info *pInfo | |
| 152 ){ | |
| 153 int i; | |
| 154 int iEq = -1; | |
| 155 int iGe = -1; | |
| 156 int iLe = -1; | |
| 157 int iLangid = -1; | |
| 158 int iNext = 1; /* Next free argvIndex value */ | |
| 159 | |
| 160 UNUSED_PARAMETER(pVTab); | |
| 161 | |
| 162 /* This vtab delivers always results in "ORDER BY term ASC" order. */ | |
| 163 if( pInfo->nOrderBy==1 | |
| 164 && pInfo->aOrderBy[0].iColumn==0 | |
| 165 && pInfo->aOrderBy[0].desc==0 | |
| 166 ){ | |
| 167 pInfo->orderByConsumed = 1; | |
| 168 } | |
| 169 | |
| 170 /* Search for equality and range constraints on the "term" column. | |
| 171 ** And equality constraints on the hidden "languageid" column. */ | |
| 172 for(i=0; i<pInfo->nConstraint; i++){ | |
| 173 if( pInfo->aConstraint[i].usable ){ | |
| 174 int op = pInfo->aConstraint[i].op; | |
| 175 int iCol = pInfo->aConstraint[i].iColumn; | |
| 176 | |
| 177 if( iCol==0 ){ | |
| 178 if( op==SQLITE_INDEX_CONSTRAINT_EQ ) iEq = i; | |
| 179 if( op==SQLITE_INDEX_CONSTRAINT_LT ) iLe = i; | |
| 180 if( op==SQLITE_INDEX_CONSTRAINT_LE ) iLe = i; | |
| 181 if( op==SQLITE_INDEX_CONSTRAINT_GT ) iGe = i; | |
| 182 if( op==SQLITE_INDEX_CONSTRAINT_GE ) iGe = i; | |
| 183 } | |
| 184 if( iCol==4 ){ | |
| 185 if( op==SQLITE_INDEX_CONSTRAINT_EQ ) iLangid = i; | |
| 186 } | |
| 187 } | |
| 188 } | |
| 189 | |
| 190 if( iEq>=0 ){ | |
| 191 pInfo->idxNum = FTS4AUX_EQ_CONSTRAINT; | |
| 192 pInfo->aConstraintUsage[iEq].argvIndex = iNext++; | |
| 193 pInfo->estimatedCost = 5; | |
| 194 }else{ | |
| 195 pInfo->idxNum = 0; | |
| 196 pInfo->estimatedCost = 20000; | |
| 197 if( iGe>=0 ){ | |
| 198 pInfo->idxNum += FTS4AUX_GE_CONSTRAINT; | |
| 199 pInfo->aConstraintUsage[iGe].argvIndex = iNext++; | |
| 200 pInfo->estimatedCost /= 2; | |
| 201 } | |
| 202 if( iLe>=0 ){ | |
| 203 pInfo->idxNum += FTS4AUX_LE_CONSTRAINT; | |
| 204 pInfo->aConstraintUsage[iLe].argvIndex = iNext++; | |
| 205 pInfo->estimatedCost /= 2; | |
| 206 } | |
| 207 } | |
| 208 if( iLangid>=0 ){ | |
| 209 pInfo->aConstraintUsage[iLangid].argvIndex = iNext++; | |
| 210 pInfo->estimatedCost--; | |
| 211 } | |
| 212 | |
| 213 return SQLITE_OK; | |
| 214 } | |
| 215 | |
| 216 /* | |
| 217 ** xOpen - Open a cursor. | |
| 218 */ | |
| 219 static int fts3auxOpenMethod(sqlite3_vtab *pVTab, sqlite3_vtab_cursor **ppCsr){ | |
| 220 Fts3auxCursor *pCsr; /* Pointer to cursor object to return */ | |
| 221 | |
| 222 UNUSED_PARAMETER(pVTab); | |
| 223 | |
| 224 pCsr = (Fts3auxCursor *)sqlite3_malloc(sizeof(Fts3auxCursor)); | |
| 225 if( !pCsr ) return SQLITE_NOMEM; | |
| 226 memset(pCsr, 0, sizeof(Fts3auxCursor)); | |
| 227 | |
| 228 *ppCsr = (sqlite3_vtab_cursor *)pCsr; | |
| 229 return SQLITE_OK; | |
| 230 } | |
| 231 | |
| 232 /* | |
| 233 ** xClose - Close a cursor. | |
| 234 */ | |
| 235 static int fts3auxCloseMethod(sqlite3_vtab_cursor *pCursor){ | |
| 236 Fts3Table *pFts3 = ((Fts3auxTable *)pCursor->pVtab)->pFts3Tab; | |
| 237 Fts3auxCursor *pCsr = (Fts3auxCursor *)pCursor; | |
| 238 | |
| 239 sqlite3Fts3SegmentsClose(pFts3); | |
| 240 sqlite3Fts3SegReaderFinish(&pCsr->csr); | |
| 241 sqlite3_free((void *)pCsr->filter.zTerm); | |
| 242 sqlite3_free(pCsr->zStop); | |
| 243 sqlite3_free(pCsr->aStat); | |
| 244 sqlite3_free(pCsr); | |
| 245 return SQLITE_OK; | |
| 246 } | |
| 247 | |
| 248 static int fts3auxGrowStatArray(Fts3auxCursor *pCsr, int nSize){ | |
| 249 if( nSize>pCsr->nStat ){ | |
| 250 struct Fts3auxColstats *aNew; | |
| 251 aNew = (struct Fts3auxColstats *)sqlite3_realloc(pCsr->aStat, | |
| 252 sizeof(struct Fts3auxColstats) * nSize | |
| 253 ); | |
| 254 if( aNew==0 ) return SQLITE_NOMEM; | |
| 255 memset(&aNew[pCsr->nStat], 0, | |
| 256 sizeof(struct Fts3auxColstats) * (nSize - pCsr->nStat) | |
| 257 ); | |
| 258 pCsr->aStat = aNew; | |
| 259 pCsr->nStat = nSize; | |
| 260 } | |
| 261 return SQLITE_OK; | |
| 262 } | |
| 263 | |
| 264 /* | |
| 265 ** xNext - Advance the cursor to the next row, if any. | |
| 266 */ | |
| 267 static int fts3auxNextMethod(sqlite3_vtab_cursor *pCursor){ | |
| 268 Fts3auxCursor *pCsr = (Fts3auxCursor *)pCursor; | |
| 269 Fts3Table *pFts3 = ((Fts3auxTable *)pCursor->pVtab)->pFts3Tab; | |
| 270 int rc; | |
| 271 | |
| 272 /* Increment our pretend rowid value. */ | |
| 273 pCsr->iRowid++; | |
| 274 | |
| 275 for(pCsr->iCol++; pCsr->iCol<pCsr->nStat; pCsr->iCol++){ | |
| 276 if( pCsr->aStat[pCsr->iCol].nDoc>0 ) return SQLITE_OK; | |
| 277 } | |
| 278 | |
| 279 rc = sqlite3Fts3SegReaderStep(pFts3, &pCsr->csr); | |
| 280 if( rc==SQLITE_ROW ){ | |
| 281 int i = 0; | |
| 282 int nDoclist = pCsr->csr.nDoclist; | |
| 283 char *aDoclist = pCsr->csr.aDoclist; | |
| 284 int iCol; | |
| 285 | |
| 286 int eState = 0; | |
| 287 | |
| 288 if( pCsr->zStop ){ | |
| 289 int n = (pCsr->nStop<pCsr->csr.nTerm) ? pCsr->nStop : pCsr->csr.nTerm; | |
| 290 int mc = memcmp(pCsr->zStop, pCsr->csr.zTerm, n); | |
| 291 if( mc<0 || (mc==0 && pCsr->csr.nTerm>pCsr->nStop) ){ | |
| 292 pCsr->isEof = 1; | |
| 293 return SQLITE_OK; | |
| 294 } | |
| 295 } | |
| 296 | |
| 297 if( fts3auxGrowStatArray(pCsr, 2) ) return SQLITE_NOMEM; | |
| 298 memset(pCsr->aStat, 0, sizeof(struct Fts3auxColstats) * pCsr->nStat); | |
| 299 iCol = 0; | |
| 300 | |
| 301 while( i<nDoclist ){ | |
| 302 sqlite3_int64 v = 0; | |
| 303 | |
| 304 i += sqlite3Fts3GetVarint(&aDoclist[i], &v); | |
| 305 switch( eState ){ | |
| 306 /* State 0. In this state the integer just read was a docid. */ | |
| 307 case 0: | |
| 308 pCsr->aStat[0].nDoc++; | |
| 309 eState = 1; | |
| 310 iCol = 0; | |
| 311 break; | |
| 312 | |
| 313 /* State 1. In this state we are expecting either a 1, indicating | |
| 314 ** that the following integer will be a column number, or the | |
| 315 ** start of a position list for column 0. | |
| 316 ** | |
| 317 ** The only difference between state 1 and state 2 is that if the | |
| 318 ** integer encountered in state 1 is not 0 or 1, then we need to | |
| 319 ** increment the column 0 "nDoc" count for this term. | |
| 320 */ | |
| 321 case 1: | |
| 322 assert( iCol==0 ); | |
| 323 if( v>1 ){ | |
| 324 pCsr->aStat[1].nDoc++; | |
| 325 } | |
| 326 eState = 2; | |
| 327 /* fall through */ | |
| 328 | |
| 329 case 2: | |
| 330 if( v==0 ){ /* 0x00. Next integer will be a docid. */ | |
| 331 eState = 0; | |
| 332 }else if( v==1 ){ /* 0x01. Next integer will be a column number. */ | |
| 333 eState = 3; | |
| 334 }else{ /* 2 or greater. A position. */ | |
| 335 pCsr->aStat[iCol+1].nOcc++; | |
| 336 pCsr->aStat[0].nOcc++; | |
| 337 } | |
| 338 break; | |
| 339 | |
| 340 /* State 3. The integer just read is a column number. */ | |
| 341 default: assert( eState==3 ); | |
| 342 iCol = (int)v; | |
| 343 if( fts3auxGrowStatArray(pCsr, iCol+2) ) return SQLITE_NOMEM; | |
| 344 pCsr->aStat[iCol+1].nDoc++; | |
| 345 eState = 2; | |
| 346 break; | |
| 347 } | |
| 348 } | |
| 349 | |
| 350 pCsr->iCol = 0; | |
| 351 rc = SQLITE_OK; | |
| 352 }else{ | |
| 353 pCsr->isEof = 1; | |
| 354 } | |
| 355 return rc; | |
| 356 } | |
| 357 | |
| 358 /* | |
| 359 ** xFilter - Initialize a cursor to point at the start of its data. | |
| 360 */ | |
| 361 static int fts3auxFilterMethod( | |
| 362 sqlite3_vtab_cursor *pCursor, /* The cursor used for this query */ | |
| 363 int idxNum, /* Strategy index */ | |
| 364 const char *idxStr, /* Unused */ | |
| 365 int nVal, /* Number of elements in apVal */ | |
| 366 sqlite3_value **apVal /* Arguments for the indexing scheme */ | |
| 367 ){ | |
| 368 Fts3auxCursor *pCsr = (Fts3auxCursor *)pCursor; | |
| 369 Fts3Table *pFts3 = ((Fts3auxTable *)pCursor->pVtab)->pFts3Tab; | |
| 370 int rc; | |
| 371 int isScan = 0; | |
| 372 int iLangVal = 0; /* Language id to query */ | |
| 373 | |
| 374 int iEq = -1; /* Index of term=? value in apVal */ | |
| 375 int iGe = -1; /* Index of term>=? value in apVal */ | |
| 376 int iLe = -1; /* Index of term<=? value in apVal */ | |
| 377 int iLangid = -1; /* Index of languageid=? value in apVal */ | |
| 378 int iNext = 0; | |
| 379 | |
| 380 UNUSED_PARAMETER(nVal); | |
| 381 UNUSED_PARAMETER(idxStr); | |
| 382 | |
| 383 assert( idxStr==0 ); | |
| 384 assert( idxNum==FTS4AUX_EQ_CONSTRAINT || idxNum==0 | |
| 385 || idxNum==FTS4AUX_LE_CONSTRAINT || idxNum==FTS4AUX_GE_CONSTRAINT | |
| 386 || idxNum==(FTS4AUX_LE_CONSTRAINT|FTS4AUX_GE_CONSTRAINT) | |
| 387 ); | |
| 388 | |
| 389 if( idxNum==FTS4AUX_EQ_CONSTRAINT ){ | |
| 390 iEq = iNext++; | |
| 391 }else{ | |
| 392 isScan = 1; | |
| 393 if( idxNum & FTS4AUX_GE_CONSTRAINT ){ | |
| 394 iGe = iNext++; | |
| 395 } | |
| 396 if( idxNum & FTS4AUX_LE_CONSTRAINT ){ | |
| 397 iLe = iNext++; | |
| 398 } | |
| 399 } | |
| 400 if( iNext<nVal ){ | |
| 401 iLangid = iNext++; | |
| 402 } | |
| 403 | |
| 404 /* In case this cursor is being reused, close and zero it. */ | |
| 405 testcase(pCsr->filter.zTerm); | |
| 406 sqlite3Fts3SegReaderFinish(&pCsr->csr); | |
| 407 sqlite3_free((void *)pCsr->filter.zTerm); | |
| 408 sqlite3_free(pCsr->aStat); | |
| 409 memset(&pCsr->csr, 0, ((u8*)&pCsr[1]) - (u8*)&pCsr->csr); | |
| 410 | |
| 411 pCsr->filter.flags = FTS3_SEGMENT_REQUIRE_POS|FTS3_SEGMENT_IGNORE_EMPTY; | |
| 412 if( isScan ) pCsr->filter.flags |= FTS3_SEGMENT_SCAN; | |
| 413 | |
| 414 if( iEq>=0 || iGe>=0 ){ | |
| 415 const unsigned char *zStr = sqlite3_value_text(apVal[0]); | |
| 416 assert( (iEq==0 && iGe==-1) || (iEq==-1 && iGe==0) ); | |
| 417 if( zStr ){ | |
| 418 pCsr->filter.zTerm = sqlite3_mprintf("%s", zStr); | |
| 419 pCsr->filter.nTerm = sqlite3_value_bytes(apVal[0]); | |
| 420 if( pCsr->filter.zTerm==0 ) return SQLITE_NOMEM; | |
| 421 } | |
| 422 } | |
| 423 | |
| 424 if( iLe>=0 ){ | |
| 425 pCsr->zStop = sqlite3_mprintf("%s", sqlite3_value_text(apVal[iLe])); | |
| 426 pCsr->nStop = sqlite3_value_bytes(apVal[iLe]); | |
| 427 if( pCsr->zStop==0 ) return SQLITE_NOMEM; | |
| 428 } | |
| 429 | |
| 430 if( iLangid>=0 ){ | |
| 431 iLangVal = sqlite3_value_int(apVal[iLangid]); | |
| 432 | |
| 433 /* If the user specified a negative value for the languageid, use zero | |
| 434 ** instead. This works, as the "languageid=?" constraint will also | |
| 435 ** be tested by the VDBE layer. The test will always be false (since | |
| 436 ** this module will not return a row with a negative languageid), and | |
| 437 ** so the overall query will return zero rows. */ | |
| 438 if( iLangVal<0 ) iLangVal = 0; | |
| 439 } | |
| 440 pCsr->iLangid = iLangVal; | |
| 441 | |
| 442 rc = sqlite3Fts3SegReaderCursor(pFts3, iLangVal, 0, FTS3_SEGCURSOR_ALL, | |
| 443 pCsr->filter.zTerm, pCsr->filter.nTerm, 0, isScan, &pCsr->csr | |
| 444 ); | |
| 445 if( rc==SQLITE_OK ){ | |
| 446 rc = sqlite3Fts3SegReaderStart(pFts3, &pCsr->csr, &pCsr->filter); | |
| 447 } | |
| 448 | |
| 449 if( rc==SQLITE_OK ) rc = fts3auxNextMethod(pCursor); | |
| 450 return rc; | |
| 451 } | |
| 452 | |
| 453 /* | |
| 454 ** xEof - Return true if the cursor is at EOF, or false otherwise. | |
| 455 */ | |
| 456 static int fts3auxEofMethod(sqlite3_vtab_cursor *pCursor){ | |
| 457 Fts3auxCursor *pCsr = (Fts3auxCursor *)pCursor; | |
| 458 return pCsr->isEof; | |
| 459 } | |
| 460 | |
| 461 /* | |
| 462 ** xColumn - Return a column value. | |
| 463 */ | |
| 464 static int fts3auxColumnMethod( | |
| 465 sqlite3_vtab_cursor *pCursor, /* Cursor to retrieve value from */ | |
| 466 sqlite3_context *pCtx, /* Context for sqlite3_result_xxx() calls */ | |
| 467 int iCol /* Index of column to read value from */ | |
| 468 ){ | |
| 469 Fts3auxCursor *p = (Fts3auxCursor *)pCursor; | |
| 470 | |
| 471 assert( p->isEof==0 ); | |
| 472 switch( iCol ){ | |
| 473 case 0: /* term */ | |
| 474 sqlite3_result_text(pCtx, p->csr.zTerm, p->csr.nTerm, SQLITE_TRANSIENT); | |
| 475 break; | |
| 476 | |
| 477 case 1: /* col */ | |
| 478 if( p->iCol ){ | |
| 479 sqlite3_result_int(pCtx, p->iCol-1); | |
| 480 }else{ | |
| 481 sqlite3_result_text(pCtx, "*", -1, SQLITE_STATIC); | |
| 482 } | |
| 483 break; | |
| 484 | |
| 485 case 2: /* documents */ | |
| 486 sqlite3_result_int64(pCtx, p->aStat[p->iCol].nDoc); | |
| 487 break; | |
| 488 | |
| 489 case 3: /* occurrences */ | |
| 490 sqlite3_result_int64(pCtx, p->aStat[p->iCol].nOcc); | |
| 491 break; | |
| 492 | |
| 493 default: /* languageid */ | |
| 494 assert( iCol==4 ); | |
| 495 sqlite3_result_int(pCtx, p->iLangid); | |
| 496 break; | |
| 497 } | |
| 498 | |
| 499 return SQLITE_OK; | |
| 500 } | |
| 501 | |
| 502 /* | |
| 503 ** xRowid - Return the current rowid for the cursor. | |
| 504 */ | |
| 505 static int fts3auxRowidMethod( | |
| 506 sqlite3_vtab_cursor *pCursor, /* Cursor to retrieve value from */ | |
| 507 sqlite_int64 *pRowid /* OUT: Rowid value */ | |
| 508 ){ | |
| 509 Fts3auxCursor *pCsr = (Fts3auxCursor *)pCursor; | |
| 510 *pRowid = pCsr->iRowid; | |
| 511 return SQLITE_OK; | |
| 512 } | |
| 513 | |
| 514 /* | |
| 515 ** Register the fts3aux module with database connection db. Return SQLITE_OK | |
| 516 ** if successful or an error code if sqlite3_create_module() fails. | |
| 517 */ | |
| 518 int sqlite3Fts3InitAux(sqlite3 *db){ | |
| 519 static const sqlite3_module fts3aux_module = { | |
| 520 0, /* iVersion */ | |
| 521 fts3auxConnectMethod, /* xCreate */ | |
| 522 fts3auxConnectMethod, /* xConnect */ | |
| 523 fts3auxBestIndexMethod, /* xBestIndex */ | |
| 524 fts3auxDisconnectMethod, /* xDisconnect */ | |
| 525 fts3auxDisconnectMethod, /* xDestroy */ | |
| 526 fts3auxOpenMethod, /* xOpen */ | |
| 527 fts3auxCloseMethod, /* xClose */ | |
| 528 fts3auxFilterMethod, /* xFilter */ | |
| 529 fts3auxNextMethod, /* xNext */ | |
| 530 fts3auxEofMethod, /* xEof */ | |
| 531 fts3auxColumnMethod, /* xColumn */ | |
| 532 fts3auxRowidMethod, /* xRowid */ | |
| 533 0, /* xUpdate */ | |
| 534 0, /* xBegin */ | |
| 535 0, /* xSync */ | |
| 536 0, /* xCommit */ | |
| 537 0, /* xRollback */ | |
| 538 0, /* xFindFunction */ | |
| 539 0, /* xRename */ | |
| 540 0, /* xSavepoint */ | |
| 541 0, /* xRelease */ | |
| 542 0 /* xRollbackTo */ | |
| 543 }; | |
| 544 int rc; /* Return code */ | |
| 545 | |
| 546 rc = sqlite3_create_module(db, "fts4aux", &fts3aux_module, 0); | |
| 547 return rc; | |
| 548 } | |
| 549 | |
| 550 #endif /* !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_FTS3) */ | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 2363173002:
[sqlite] Remove obsolete reference version 3.8.7.4. (Closed)
