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Overview
Comment: | Add missing file fts3_aux.c. |
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Downloads: | Tarball | ZIP archive |
Timelines: | family | ancestors | descendants | both | fts4aux |
Files: | files | file ages | folders |
SHA1: |
0147d9739f318a02721d3ae0e7be339a |
User & Date: | dan 2011-02-02 04:26:46.725 |
Context
2011-02-02
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04:40 | Merge fts4aux branch. (check-in: c6d9f7d8c4 user: dan tags: trunk) | |
04:26 | Add missing file fts3_aux.c. (Closed-Leaf check-in: 0147d9739f user: dan tags: fts4aux) | |
2011-02-01
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18:59 | Remove extra instances of the text "checked out." from sqlite.h.in. Also add new file fts3_aux.c to mksqlite3c.tcl. (check-in: 9897da22c5 user: dan tags: fts4aux) | |
Changes
Added ext/fts3/fts3_aux.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 | /* ** 2011 Jan 27 ** ** 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. ** ****************************************************************************** ** */ #if !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_FTS3) #include "fts3Int.h" #include <string.h> #include <assert.h> typedef struct Fts3auxTable Fts3auxTable; typedef struct Fts3auxCursor Fts3auxCursor; struct Fts3auxTable { sqlite3_vtab base; /* Base class used by SQLite core */ Fts3Table *pFts3Tab; }; struct Fts3auxCursor { sqlite3_vtab_cursor base; /* Base class used by SQLite core */ Fts3SegFilter filter; Fts3SegReaderCursor csr; int isEof; sqlite3_int64 iRowid; sqlite3_int64 nDoc; sqlite3_int64 nOcc; }; /* ** Schema of the terms table. */ #define FTS3_TERMS_SCHEMA "CREATE TABLE x(term, documents, occurrences)" /* ** This function does all the work for both the xConnect and xCreate methods. ** These tables have no persistent representation of their own, so xConnect ** and xCreate are identical operations. */ static int fts3auxConnectMethod( sqlite3 *db, /* Database connection */ void *pUnused, /* Unused */ int argc, /* Number of elements in argv array */ const char * const *argv, /* xCreate/xConnect argument array */ sqlite3_vtab **ppVtab, /* OUT: New sqlite3_vtab object */ char **pzErr /* OUT: sqlite3_malloc'd error message */ ){ char const *zDb; /* Name of database (e.g. "main") */ char const *zFts3; /* Name of fts3 table */ int nDb; /* Result of strlen(zDb) */ int nFts3; /* Result of strlen(zFts3) */ int nByte; /* Bytes of space to allocate here */ int rc; /* value returned by declare_vtab() */ Fts3auxTable *p; /* Virtual table object to return */ /* The user should specify a single argument - the name of an fts3 table. */ if( argc!=4 ){ *pzErr = sqlite3_mprintf("wrong number of arguments"); return SQLITE_ERROR; } zDb = argv[1]; nDb = strlen(zDb); zFts3 = argv[3]; nFts3 = strlen(zFts3); rc = sqlite3_declare_vtab(db, FTS3_TERMS_SCHEMA); if( rc!=SQLITE_OK ) return rc; nByte = sizeof(Fts3auxTable) + sizeof(Fts3Table) + nDb + nFts3 + 2; p = (Fts3auxTable *)sqlite3_malloc(nByte); if( !p ) return SQLITE_NOMEM; memset(p, 0, nByte); p->pFts3Tab = (Fts3Table *)&p[1]; p->pFts3Tab->zDb = (char *)&p->pFts3Tab[1]; p->pFts3Tab->zName = &p->pFts3Tab->zDb[nDb+1]; p->pFts3Tab->db = db; memcpy((char *)p->pFts3Tab->zDb, zDb, nDb); memcpy((char *)p->pFts3Tab->zName, zFts3, nFts3); *ppVtab = (sqlite3_vtab *)p; return SQLITE_OK; } /* ** This function does the work for both the xDisconnect and xDestroy methods. ** These tables have no persistent representation of their own, so xDisconnect ** and xDestroy are identical operations. */ static int fts3auxDisconnectMethod(sqlite3_vtab *pVtab){ Fts3auxTable *p = (Fts3auxTable *)pVtab; Fts3Table *pFts3 = p->pFts3Tab; int i; /* Free any prepared statements held */ for(i=0; i<SizeofArray(pFts3->aStmt); i++){ sqlite3_finalize(pFts3->aStmt[i]); } sqlite3_free(pFts3->zSegmentsTbl); sqlite3_free(p); return SQLITE_OK; } /* ** xBestIndex - Analyze a WHERE and ORDER BY clause. */ static int fts3auxBestIndexMethod( sqlite3_vtab *pVTab, sqlite3_index_info *pInfo ){ /* This vtab delivers always results in "ORDER BY term ASC" order. */ if( pInfo->nOrderBy==1 && pInfo->aOrderBy[0].iColumn==0 && pInfo->aOrderBy[0].desc==0 ){ pInfo->orderByConsumed = 1; } pInfo->estimatedCost = 20000; return SQLITE_OK; } /* ** xOpen - Open a cursor. */ static int fts3auxOpenMethod(sqlite3_vtab *pVTab, sqlite3_vtab_cursor **ppCsr){ Fts3auxCursor *pCsr; /* Pointer to cursor object to return */ pCsr = (Fts3auxCursor *)sqlite3_malloc(sizeof(Fts3auxCursor)); if( !pCsr ) return SQLITE_NOMEM; memset(pCsr, 0, sizeof(Fts3auxCursor)); *ppCsr = (sqlite3_vtab_cursor *)pCsr; return SQLITE_OK; } /* ** xClose - Close a cursor. */ static int fts3auxCloseMethod(sqlite3_vtab_cursor *pCursor){ Fts3Table *pFts3 = ((Fts3auxTable *)pCursor->pVtab)->pFts3Tab; Fts3auxCursor *pCsr = (Fts3auxCursor *)pCursor; sqlite3Fts3SegmentsClose(pFts3); sqlite3Fts3SegReaderFinish(&pCsr->csr); sqlite3_free(pCsr); return SQLITE_OK; } /* ** xNext - Advance the cursor to the next row, if any. */ static int fts3auxNextMethod(sqlite3_vtab_cursor *pCursor){ Fts3auxCursor *pCsr = (Fts3auxCursor *)pCursor; Fts3Table *pFts3 = ((Fts3auxTable *)pCursor->pVtab)->pFts3Tab; int rc; rc = sqlite3Fts3SegReaderStep(pFts3, &pCsr->csr); if( rc==SQLITE_ROW ){ int i; int isIgnore = 1; int nDoclist = pCsr->csr.nDoclist; char *aDoclist = pCsr->csr.aDoclist; /* Now count the number of documents and positions in the doclist ** in pCsr->csr.aDoclist[]. Store the number of documents in pCsr->nDoc ** and the number of occurrences in pCsr->nOcc. */ pCsr->nDoc = 0; pCsr->nOcc = 0; i = 0; while( i<nDoclist ){ sqlite3_int64 v = 0; i += sqlite3Fts3GetVarint(&aDoclist[i], &v); if( isIgnore ){ isIgnore = 0; }else if( v>1 ){ pCsr->nOcc++; }else{ if( v==0 ) pCsr->nDoc++; isIgnore = 1; } } rc = SQLITE_OK; pCsr->iRowid++; }else{ pCsr->isEof = 1; } return rc; } /* ** xFilter - Initialize a cursor to point at the start of its data. */ static int fts3auxFilterMethod( sqlite3_vtab_cursor *pCursor, /* The cursor used for this query */ int idxNum, /* Strategy index */ const char *idxStr, /* Unused */ int nVal, /* Number of elements in apVal */ sqlite3_value **apVal /* Arguments for the indexing scheme */ ){ Fts3auxCursor *pCsr = (Fts3auxCursor *)pCursor; Fts3Table *pFts3 = ((Fts3auxTable *)pCursor->pVtab)->pFts3Tab; int rc; sqlite3Fts3SegReaderFinish(&pCsr->csr); memset(&pCsr->csr, 0, sizeof(Fts3SegReaderCursor)); pCsr->isEof = 0; pCsr->iRowid = 0; pCsr->filter.flags = FTS3_SEGMENT_REQUIRE_POS|FTS3_SEGMENT_IGNORE_EMPTY; rc = sqlite3Fts3SegReaderCursor(pFts3, FTS3_SEGCURSOR_ALL, 0, 0,1,&pCsr->csr); if( rc==SQLITE_OK ){ rc = sqlite3Fts3SegReaderStart(pFts3, &pCsr->csr, &pCsr->filter); } if( rc==SQLITE_OK ) rc = fts3auxNextMethod(pCursor); return rc; } /* ** xEof - Return true if the cursor is at EOF, or false otherwise. */ static int fts3auxEofMethod(sqlite3_vtab_cursor *pCursor){ Fts3auxCursor *pCsr = (Fts3auxCursor *)pCursor; return pCsr->isEof; } /* ** xColumn - Return a column value. */ static int fts3auxColumnMethod( sqlite3_vtab_cursor *pCursor, /* Cursor to retrieve value from */ sqlite3_context *pContext, /* Context for sqlite3_result_xxx() calls */ int iCol /* Index of column to read value from */ ){ Fts3auxCursor *p = (Fts3auxCursor *)pCursor; assert( p->isEof==0 ); if( iCol==0 ){ /* Column "term" */ sqlite3_result_text(pContext, p->csr.zTerm, p->csr.nTerm, SQLITE_TRANSIENT); }else if( iCol==1 ){ /* Column "documents" */ sqlite3_result_int64(pContext, p->nDoc); }else{ /* Column "occurrences" */ sqlite3_result_int64(pContext, p->nOcc); } return SQLITE_OK; } /* ** xRowid - Return the current rowid for the cursor. */ static int fts3auxRowidMethod( sqlite3_vtab_cursor *pCursor, /* Cursor to retrieve value from */ sqlite_int64 *pRowid /* OUT: Rowid value */ ){ Fts3auxCursor *pCsr = (Fts3auxCursor *)pCursor; *pRowid = pCsr->iRowid; return SQLITE_OK; } /* ** Register the fts3aux module with database connection db. Return SQLITE_OK ** if successful or an error code if sqlite3_create_module() fails. */ int sqlite3Fts3InitAux(sqlite3 *db){ static const sqlite3_module fts3aux_module = { 0, /* iVersion */ fts3auxConnectMethod, /* xCreate */ fts3auxConnectMethod, /* xConnect */ fts3auxBestIndexMethod, /* xBestIndex */ fts3auxDisconnectMethod, /* xDisconnect */ fts3auxDisconnectMethod, /* xDestroy */ fts3auxOpenMethod, /* xOpen */ fts3auxCloseMethod, /* xClose */ fts3auxFilterMethod, /* xFilter */ fts3auxNextMethod, /* xNext */ fts3auxEofMethod, /* xEof */ fts3auxColumnMethod, /* xColumn */ fts3auxRowidMethod, /* xRowid */ 0, /* xUpdate */ 0, /* xBegin */ 0, /* xSync */ 0, /* xCommit */ 0, /* xRollback */ 0, /* xFindFunction */ 0 /* xRename */ }; int rc; /* Return code */ rc = sqlite3_create_module(db, "fts4aux", &fts3aux_module, 0); return rc; } #endif /* !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_FTS3) */ |