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Changes In Branch serializable-snapshot Excluding Merge-Ins
This is equivalent to a diff from bee2859b to e2c4bdf5
2016-11-26
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19:44 | Add the sqlite3_snapshot_recover() interface and related functionality. (check-in: b70c85ce user: drh tags: trunk) | |
2016-11-23
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14:19 | Correctly display the names of SQL functions in the VDBE_PROFILE output. (check-in: 161192f1 user: drh tags: trunk) | |
2016-11-22
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22:23 | Merge bug fixes and enhancements from trunk. (Closed-Leaf check-in: e2c4bdf5 user: drh tags: serializable-snapshot) | |
21:11 | Enclose the sqlite3WalSnapshotRecover() routine within (check-in: e7be3183 user: drh tags: serializable-snapshot) | |
20:29 | Add a new requirement mark for CAST expressions. (check-in: bee2859b user: drh tags: trunk) | |
19:15 | Update requirement marks to reflect changes in wording in the documentation. No changes to code. (check-in: f5ac98ef user: drh tags: trunk) | |
Changes to src/main.c.
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3977 3978 3979 3980 3981 3982 3983 | int sqlite3_snapshot_get( sqlite3 *db, const char *zDb, sqlite3_snapshot **ppSnapshot ){ int rc = SQLITE_ERROR; #ifndef SQLITE_OMIT_WAL | < > | | | | | | | > | 3977 3978 3979 3980 3981 3982 3983 3984 3985 3986 3987 3988 3989 3990 3991 3992 3993 3994 3995 3996 3997 3998 3999 4000 4001 4002 4003 4004 4005 4006 4007 | int sqlite3_snapshot_get( sqlite3 *db, const char *zDb, sqlite3_snapshot **ppSnapshot ){ int rc = SQLITE_ERROR; #ifndef SQLITE_OMIT_WAL #ifdef SQLITE_ENABLE_API_ARMOR if( !sqlite3SafetyCheckOk(db) ){ return SQLITE_MISUSE_BKPT; } #endif sqlite3_mutex_enter(db->mutex); if( db->autoCommit==0 ){ int iDb = sqlite3FindDbName(db, zDb); if( iDb==0 || iDb>1 ){ Btree *pBt = db->aDb[iDb].pBt; if( 0==sqlite3BtreeIsInTrans(pBt) ){ rc = sqlite3BtreeBeginTrans(pBt, 0); if( rc==SQLITE_OK ){ rc = sqlite3PagerSnapshotGet(sqlite3BtreePager(pBt), ppSnapshot); } } } } sqlite3_mutex_leave(db->mutex); #endif /* SQLITE_OMIT_WAL */ return rc; |
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4034 4035 4036 4037 4038 4039 4040 4041 4042 4043 4044 4045 4046 4047 4048 4049 4050 4051 4052 | rc = sqlite3BtreeBeginTrans(pBt, 0); sqlite3PagerSnapshotOpen(sqlite3BtreePager(pBt), 0); } } } } sqlite3_mutex_leave(db->mutex); #endif /* SQLITE_OMIT_WAL */ return rc; } /* ** Free a snapshot handle obtained from sqlite3_snapshot_get(). */ void sqlite3_snapshot_free(sqlite3_snapshot *pSnapshot){ sqlite3_free(pSnapshot); } #endif /* SQLITE_ENABLE_SNAPSHOT */ | > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > | 4035 4036 4037 4038 4039 4040 4041 4042 4043 4044 4045 4046 4047 4048 4049 4050 4051 4052 4053 4054 4055 4056 4057 4058 4059 4060 4061 4062 4063 4064 4065 4066 4067 4068 4069 4070 4071 4072 4073 4074 4075 4076 4077 4078 4079 4080 4081 4082 4083 4084 4085 | rc = sqlite3BtreeBeginTrans(pBt, 0); sqlite3PagerSnapshotOpen(sqlite3BtreePager(pBt), 0); } } } } sqlite3_mutex_leave(db->mutex); #endif /* SQLITE_OMIT_WAL */ return rc; } /* ** Recover as many snapshots as possible from the wal file associated with ** schema zDb of database db. */ int sqlite3_snapshot_recover(sqlite3 *db, const char *zDb){ int rc = SQLITE_ERROR; int iDb; #ifndef SQLITE_OMIT_WAL #ifdef SQLITE_ENABLE_API_ARMOR if( !sqlite3SafetyCheckOk(db) ){ return SQLITE_MISUSE_BKPT; } #endif sqlite3_mutex_enter(db->mutex); iDb = sqlite3FindDbName(db, zDb); if( iDb==0 || iDb>1 ){ Btree *pBt = db->aDb[iDb].pBt; if( 0==sqlite3BtreeIsInReadTrans(pBt) ){ rc = sqlite3BtreeBeginTrans(pBt, 0); if( rc==SQLITE_OK ){ rc = sqlite3PagerSnapshotRecover(sqlite3BtreePager(pBt)); sqlite3BtreeCommit(pBt); } } } sqlite3_mutex_leave(db->mutex); #endif /* SQLITE_OMIT_WAL */ return rc; } /* ** Free a snapshot handle obtained from sqlite3_snapshot_get(). */ void sqlite3_snapshot_free(sqlite3_snapshot *pSnapshot){ sqlite3_free(pSnapshot); } #endif /* SQLITE_ENABLE_SNAPSHOT */ |
Changes to src/pager.c.
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7401 7402 7403 7404 7405 7406 7407 7408 7409 7410 7411 7412 7413 7414 | if( pPager->pWal ){ sqlite3WalSnapshotOpen(pPager->pWal, pSnapshot); }else{ rc = SQLITE_ERROR; } return rc; } #endif /* SQLITE_ENABLE_SNAPSHOT */ #endif /* !SQLITE_OMIT_WAL */ #ifdef SQLITE_ENABLE_ZIPVFS /* ** A read-lock must be held on the pager when this function is called. If ** the pager is in WAL mode and the WAL file currently contains one or more | > > > > > > > > > > > > > > | 7401 7402 7403 7404 7405 7406 7407 7408 7409 7410 7411 7412 7413 7414 7415 7416 7417 7418 7419 7420 7421 7422 7423 7424 7425 7426 7427 7428 | if( pPager->pWal ){ sqlite3WalSnapshotOpen(pPager->pWal, pSnapshot); }else{ rc = SQLITE_ERROR; } return rc; } /* ** If this is a WAL database, call sqlite3WalSnapshotRecover(). If this ** is not a WAL database, return an error. */ int sqlite3PagerSnapshotRecover(Pager *pPager){ int rc; if( pPager->pWal ){ rc = sqlite3WalSnapshotRecover(pPager->pWal); }else{ rc = SQLITE_ERROR; } return rc; } #endif /* SQLITE_ENABLE_SNAPSHOT */ #endif /* !SQLITE_OMIT_WAL */ #ifdef SQLITE_ENABLE_ZIPVFS /* ** A read-lock must be held on the pager when this function is called. If ** the pager is in WAL mode and the WAL file currently contains one or more |
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Changes to src/pager.h.
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178 179 180 181 182 183 184 185 186 187 188 189 190 191 | int sqlite3PagerWalCallback(Pager *pPager); int sqlite3PagerOpenWal(Pager *pPager, int *pisOpen); int sqlite3PagerCloseWal(Pager *pPager, sqlite3*); int sqlite3PagerUseWal(Pager *pPager); # ifdef SQLITE_ENABLE_SNAPSHOT int sqlite3PagerSnapshotGet(Pager *pPager, sqlite3_snapshot **ppSnapshot); int sqlite3PagerSnapshotOpen(Pager *pPager, sqlite3_snapshot *pSnapshot); # endif #else # define sqlite3PagerUseWal(x) 0 #endif #ifdef SQLITE_ENABLE_ZIPVFS int sqlite3PagerWalFramesize(Pager *pPager); | > | 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 | int sqlite3PagerWalCallback(Pager *pPager); int sqlite3PagerOpenWal(Pager *pPager, int *pisOpen); int sqlite3PagerCloseWal(Pager *pPager, sqlite3*); int sqlite3PagerUseWal(Pager *pPager); # ifdef SQLITE_ENABLE_SNAPSHOT int sqlite3PagerSnapshotGet(Pager *pPager, sqlite3_snapshot **ppSnapshot); int sqlite3PagerSnapshotOpen(Pager *pPager, sqlite3_snapshot *pSnapshot); int sqlite3PagerSnapshotRecover(Pager *pPager); # endif #else # define sqlite3PagerUseWal(x) 0 #endif #ifdef SQLITE_ENABLE_ZIPVFS int sqlite3PagerWalFramesize(Pager *pPager); |
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Changes to src/sqlite.h.in.
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8279 8280 8281 8282 8283 8284 8285 | ** the most recent version. ** ** The constructor for this object is [sqlite3_snapshot_get()]. The ** [sqlite3_snapshot_open()] method causes a fresh read transaction to refer ** to an historical snapshot (if possible). The destructor for ** sqlite3_snapshot objects is [sqlite3_snapshot_free()]. */ | | > > > > > > > > > > > > > | > > > > > > > > > > > > > | < | 8279 8280 8281 8282 8283 8284 8285 8286 8287 8288 8289 8290 8291 8292 8293 8294 8295 8296 8297 8298 8299 8300 8301 8302 8303 8304 8305 8306 8307 8308 8309 8310 8311 8312 8313 8314 8315 8316 8317 8318 8319 8320 8321 8322 8323 8324 8325 8326 8327 8328 8329 8330 8331 | ** the most recent version. ** ** The constructor for this object is [sqlite3_snapshot_get()]. The ** [sqlite3_snapshot_open()] method causes a fresh read transaction to refer ** to an historical snapshot (if possible). The destructor for ** sqlite3_snapshot objects is [sqlite3_snapshot_free()]. */ typedef struct sqlite3_snapshot { unsigned char hidden[48]; } sqlite3_snapshot; /* ** CAPI3REF: Record A Database Snapshot ** EXPERIMENTAL ** ** ^The [sqlite3_snapshot_get(D,S,P)] interface attempts to make a ** new [sqlite3_snapshot] object that records the current state of ** schema S in database connection D. ^On success, the ** [sqlite3_snapshot_get(D,S,P)] interface writes a pointer to the newly ** created [sqlite3_snapshot] object into *P and returns SQLITE_OK. ** If there is not already a read-transaction open on schema S when ** this function is called, one is opened automatically. ** ** The following must be true for this function to succeed. If any of ** the following statements are false when sqlite3_snapshot_get() is ** called, SQLITE_ERROR is returned. The final value of *P is undefined ** in this case. ** ** <ul> ** <li> The database handle must be in [autocommit mode]. ** ** <li> Schema S of [database connection] D must be a [WAL mode] database. ** ** <li> There must not be a write transaction open on schema S of database ** connection D. ** ** <li> One or more transactions must have been written to the current wal ** file since it was created on disk (by any connection). This means ** that a snapshot cannot be taken on a wal mode database with no wal ** file immediately after it is first opened. At least one transaction ** must be written to it first. ** </ul> ** ** This function may also return SQLITE_NOMEM. If it is called with the ** database handle in autocommit mode but fails for some other reason, ** whether or not a read transaction is opened on schema S is undefined. ** ** The [sqlite3_snapshot] object returned from a successful call to ** [sqlite3_snapshot_get()] must be freed using [sqlite3_snapshot_free()] ** to avoid a memory leak. ** ** The [sqlite3_snapshot_get()] interface is only available when the ** SQLITE_ENABLE_SNAPSHOT compile-time option is used. |
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8385 8386 8387 8388 8389 8390 8391 8392 8393 8394 8395 8396 8397 8398 8399 8400 8401 8402 8403 | ** snapshot, and a positive value if P1 is a newer snapshot than P2. */ SQLITE_EXPERIMENTAL int sqlite3_snapshot_cmp( sqlite3_snapshot *p1, sqlite3_snapshot *p2 ); /* ** Undo the hack that converts floating point types to integer for ** builds on processors without floating point support. */ #ifdef SQLITE_OMIT_FLOATING_POINT # undef double #endif #ifdef __cplusplus } /* End of the 'extern "C"' block */ #endif #endif /* SQLITE3_H */ | > > > > > > > > > > > > > > > > > > > > > > | 8410 8411 8412 8413 8414 8415 8416 8417 8418 8419 8420 8421 8422 8423 8424 8425 8426 8427 8428 8429 8430 8431 8432 8433 8434 8435 8436 8437 8438 8439 8440 8441 8442 8443 8444 8445 8446 8447 8448 8449 8450 | ** snapshot, and a positive value if P1 is a newer snapshot than P2. */ SQLITE_EXPERIMENTAL int sqlite3_snapshot_cmp( sqlite3_snapshot *p1, sqlite3_snapshot *p2 ); /* ** CAPI3REF: Recover snapshots from a wal file ** EXPERIMENTAL ** ** If all connections disconnect from a database file but do not perform ** a checkpoint, the existing wal file is opened along with the database ** file the next time the database is opened. At this point it is only ** possible to successfully call sqlite3_snapshot_open() to open the most ** recent snapshot of the database (the one at the head of the wal file), ** even though the wal file may contain other valid snapshots for which ** clients have sqlite3_snapshot handles. ** ** This function attempts to scan the wal file associated with database zDb ** of database handle db and make all valid snapshots available to ** sqlite3_snapshot_open(). It is an error if there is already a read ** transaction open on the database, or if the database is not a wal mode ** database. ** ** SQLITE_OK is returned if successful, or an SQLite error code otherwise. */ SQLITE_EXPERIMENTAL int sqlite3_snapshot_recover(sqlite3 *db, const char *zDb); /* ** Undo the hack that converts floating point types to integer for ** builds on processors without floating point support. */ #ifdef SQLITE_OMIT_FLOATING_POINT # undef double #endif #ifdef __cplusplus } /* End of the 'extern "C"' block */ #endif #endif /* SQLITE3_H */ |
Changes to src/test1.c.
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2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 | if( sqlite3TestMakePointerStr(interp, zBuf, pSnapshot) ) return TCL_ERROR; Tcl_SetObjResult(interp, Tcl_NewStringObj(zBuf, -1)); } return TCL_OK; } #endif /* SQLITE_ENABLE_SNAPSHOT */ #ifdef SQLITE_ENABLE_SNAPSHOT /* ** Usage: sqlite3_snapshot_open DB DBNAME SNAPSHOT */ static int SQLITE_TCLAPI test_snapshot_open( void * clientData, Tcl_Interp *interp, | > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > | 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 | if( sqlite3TestMakePointerStr(interp, zBuf, pSnapshot) ) return TCL_ERROR; Tcl_SetObjResult(interp, Tcl_NewStringObj(zBuf, -1)); } return TCL_OK; } #endif /* SQLITE_ENABLE_SNAPSHOT */ #ifdef SQLITE_ENABLE_SNAPSHOT /* ** Usage: sqlite3_snapshot_recover DB DBNAME */ static int SQLITE_TCLAPI test_snapshot_recover( void * clientData, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv[] ){ int rc; sqlite3 *db; char *zName; if( objc!=3 ){ Tcl_WrongNumArgs(interp, 1, objv, "DB DBNAME"); return TCL_ERROR; } if( getDbPointer(interp, Tcl_GetString(objv[1]), &db) ) return TCL_ERROR; zName = Tcl_GetString(objv[2]); rc = sqlite3_snapshot_recover(db, zName); if( rc!=SQLITE_OK ){ Tcl_SetObjResult(interp, Tcl_NewStringObj(sqlite3ErrName(rc), -1)); return TCL_ERROR; }else{ Tcl_ResetResult(interp); } return TCL_OK; } #endif /* SQLITE_ENABLE_SNAPSHOT */ #ifdef SQLITE_ENABLE_SNAPSHOT /* ** Usage: sqlite3_snapshot_open DB DBNAME SNAPSHOT */ static int SQLITE_TCLAPI test_snapshot_open( void * clientData, Tcl_Interp *interp, |
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2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 | return TCL_ERROR; } p1 = (sqlite3_snapshot*)sqlite3TestTextToPtr(Tcl_GetString(objv[1])); p2 = (sqlite3_snapshot*)sqlite3TestTextToPtr(Tcl_GetString(objv[2])); res = sqlite3_snapshot_cmp(p1, p2); Tcl_SetObjResult(interp, Tcl_NewIntObj(res)); return TCL_OK; } #endif /* SQLITE_ENABLE_SNAPSHOT */ /* ** Usage: sqlite3_delete_database FILENAME */ int sqlite3_delete_database(const char*); /* in test_delete.c */ | > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > | 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 | return TCL_ERROR; } p1 = (sqlite3_snapshot*)sqlite3TestTextToPtr(Tcl_GetString(objv[1])); p2 = (sqlite3_snapshot*)sqlite3TestTextToPtr(Tcl_GetString(objv[2])); res = sqlite3_snapshot_cmp(p1, p2); Tcl_SetObjResult(interp, Tcl_NewIntObj(res)); return TCL_OK; } #endif /* SQLITE_ENABLE_SNAPSHOT */ #ifdef SQLITE_ENABLE_SNAPSHOT /* ** Usage: sqlite3_snapshot_get_blob DB DBNAME */ static int SQLITE_TCLAPI test_snapshot_get_blob( void * clientData, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv[] ){ int rc; sqlite3 *db; char *zName; sqlite3_snapshot *pSnapshot = 0; if( objc!=3 ){ Tcl_WrongNumArgs(interp, 1, objv, "DB DBNAME"); return TCL_ERROR; } if( getDbPointer(interp, Tcl_GetString(objv[1]), &db) ) return TCL_ERROR; zName = Tcl_GetString(objv[2]); rc = sqlite3_snapshot_get(db, zName, &pSnapshot); if( rc!=SQLITE_OK ){ Tcl_SetObjResult(interp, Tcl_NewStringObj(sqlite3ErrName(rc), -1)); return TCL_ERROR; }else{ Tcl_SetObjResult(interp, Tcl_NewByteArrayObj((unsigned char*)pSnapshot, sizeof(sqlite3_snapshot)) ); sqlite3_snapshot_free(pSnapshot); } return TCL_OK; } #endif /* SQLITE_ENABLE_SNAPSHOT */ #ifdef SQLITE_ENABLE_SNAPSHOT /* ** Usage: sqlite3_snapshot_open_blob DB DBNAME SNAPSHOT */ static int SQLITE_TCLAPI test_snapshot_open_blob( void * clientData, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv[] ){ int rc; sqlite3 *db; char *zName; unsigned char *pBlob; int nBlob; if( objc!=4 ){ Tcl_WrongNumArgs(interp, 1, objv, "DB DBNAME SNAPSHOT"); return TCL_ERROR; } if( getDbPointer(interp, Tcl_GetString(objv[1]), &db) ) return TCL_ERROR; zName = Tcl_GetString(objv[2]); pBlob = Tcl_GetByteArrayFromObj(objv[3], &nBlob); if( nBlob!=sizeof(sqlite3_snapshot) ){ Tcl_AppendResult(interp, "bad SNAPSHOT", 0); return TCL_ERROR; } rc = sqlite3_snapshot_open(db, zName, (sqlite3_snapshot*)pBlob); if( rc!=SQLITE_OK ){ Tcl_SetObjResult(interp, Tcl_NewStringObj(sqlite3ErrName(rc), -1)); return TCL_ERROR; } return TCL_OK; } #endif /* SQLITE_ENABLE_SNAPSHOT */ #ifdef SQLITE_ENABLE_SNAPSHOT /* ** Usage: sqlite3_snapshot_cmp_blob SNAPSHOT1 SNAPSHOT2 */ static int SQLITE_TCLAPI test_snapshot_cmp_blob( void * clientData, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv[] ){ int res; unsigned char *p1; unsigned char *p2; int n1; int n2; if( objc!=3 ){ Tcl_WrongNumArgs(interp, 1, objv, "SNAPSHOT1 SNAPSHOT2"); return TCL_ERROR; } p1 = Tcl_GetByteArrayFromObj(objv[1], &n1); p2 = Tcl_GetByteArrayFromObj(objv[2], &n2); if( n1!=sizeof(sqlite3_snapshot) || n1!=n2 ){ Tcl_AppendResult(interp, "bad SNAPSHOT", 0); return TCL_ERROR; } res = sqlite3_snapshot_cmp((sqlite3_snapshot*)p1, (sqlite3_snapshot*)p2); Tcl_SetObjResult(interp, Tcl_NewIntObj(res)); return TCL_OK; } #endif /* SQLITE_ENABLE_SNAPSHOT */ /* ** Usage: sqlite3_delete_database FILENAME */ int sqlite3_delete_database(const char*); /* in test_delete.c */ |
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7535 7536 7537 7538 7539 7540 7541 7542 7543 7544 7545 7546 7547 7548 | #endif { "vfs_current_time_int64", vfsCurrentTimeInt64, 0 }, #ifdef SQLITE_ENABLE_SNAPSHOT { "sqlite3_snapshot_get", test_snapshot_get, 0 }, { "sqlite3_snapshot_open", test_snapshot_open, 0 }, { "sqlite3_snapshot_free", test_snapshot_free, 0 }, { "sqlite3_snapshot_cmp", test_snapshot_cmp, 0 }, #endif { "sqlite3_delete_database", test_delete_database, 0 }, }; static int bitmask_size = sizeof(Bitmask)*8; static int longdouble_size = sizeof(LONGDOUBLE_TYPE); int i; extern int sqlite3_sync_count, sqlite3_fullsync_count; | > > > > | 7674 7675 7676 7677 7678 7679 7680 7681 7682 7683 7684 7685 7686 7687 7688 7689 7690 7691 | #endif { "vfs_current_time_int64", vfsCurrentTimeInt64, 0 }, #ifdef SQLITE_ENABLE_SNAPSHOT { "sqlite3_snapshot_get", test_snapshot_get, 0 }, { "sqlite3_snapshot_open", test_snapshot_open, 0 }, { "sqlite3_snapshot_free", test_snapshot_free, 0 }, { "sqlite3_snapshot_cmp", test_snapshot_cmp, 0 }, { "sqlite3_snapshot_recover", test_snapshot_recover, 0 }, { "sqlite3_snapshot_get_blob", test_snapshot_get_blob, 0 }, { "sqlite3_snapshot_open_blob", test_snapshot_open_blob, 0 }, { "sqlite3_snapshot_cmp_blob", test_snapshot_cmp_blob, 0 }, #endif { "sqlite3_delete_database", test_delete_database, 0 }, }; static int bitmask_size = sizeof(Bitmask)*8; static int longdouble_size = sizeof(LONGDOUBLE_TYPE); int i; extern int sqlite3_sync_count, sqlite3_fullsync_count; |
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Changes to src/wal.c.
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2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 | }else{ assert( mxReadMark<=pWal->hdr.mxFrame ); pWal->readLock = (i16)mxI; } return rc; } /* ** Begin a read transaction on the database. ** ** This routine used to be called sqlite3OpenSnapshot() and with good reason: ** it takes a snapshot of the state of the WAL and wal-index for the current ** instant in time. The current thread will continue to use this snapshot. ** Other threads might append new content to the WAL and wal-index but | > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > | 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 | }else{ assert( mxReadMark<=pWal->hdr.mxFrame ); pWal->readLock = (i16)mxI; } return rc; } #ifdef SQLITE_ENABLE_SNAPSHOT /* ** Attempt to reduce the value of the WalCkptInfo.nBackfillAttempted ** variable so that older snapshots can be accessed. To do this, loop ** through all wal frames from nBackfillAttempted to (nBackfill+1), ** comparing their content to the corresponding page with the database ** file, if any. Set nBackfillAttempted to the frame number of the ** first frame for which the wal file content matches the db file. ** ** This is only really safe if the file-system is such that any page ** writes made by earlier checkpointers were atomic operations, which ** is not always true. It is also possible that nBackfillAttempted ** may be left set to a value larger than expected, if a wal frame ** contains content that duplicate of an earlier version of the same ** page. ** ** SQLITE_OK is returned if successful, or an SQLite error code if an ** error occurs. It is not an error if nBackfillAttempted cannot be ** decreased at all. */ int sqlite3WalSnapshotRecover(Wal *pWal){ int rc; assert( pWal->readLock>=0 ); rc = walLockExclusive(pWal, WAL_CKPT_LOCK, 1); if( rc==SQLITE_OK ){ volatile WalCkptInfo *pInfo = walCkptInfo(pWal); int szPage = (int)pWal->szPage; i64 szDb; /* Size of db file in bytes */ rc = sqlite3OsFileSize(pWal->pDbFd, &szDb); if( rc==SQLITE_OK ){ void *pBuf1 = sqlite3_malloc(szPage); void *pBuf2 = sqlite3_malloc(szPage); if( pBuf1==0 || pBuf2==0 ){ rc = SQLITE_NOMEM; }else{ u32 i = pInfo->nBackfillAttempted; for(i=pInfo->nBackfillAttempted; i>pInfo->nBackfill; i--){ volatile ht_slot *dummy; volatile u32 *aPgno; /* Array of page numbers */ u32 iZero; /* Frame corresponding to aPgno[0] */ u32 pgno; /* Page number in db file */ i64 iDbOff; /* Offset of db file entry */ i64 iWalOff; /* Offset of wal file entry */ rc = walHashGet(pWal, walFramePage(i), &dummy, &aPgno, &iZero); if( rc!=SQLITE_OK ) break; pgno = aPgno[i-iZero]; iDbOff = (i64)(pgno-1) * szPage; if( iDbOff+szPage<=szDb ){ iWalOff = walFrameOffset(i, szPage) + WAL_FRAME_HDRSIZE; rc = sqlite3OsRead(pWal->pWalFd, pBuf1, szPage, iWalOff); if( rc==SQLITE_OK ){ rc = sqlite3OsRead(pWal->pDbFd, pBuf2, szPage, iDbOff); } if( rc!=SQLITE_OK || 0==memcmp(pBuf1, pBuf2, szPage) ){ break; } } pInfo->nBackfillAttempted = i-1; } } sqlite3_free(pBuf1); sqlite3_free(pBuf2); } walUnlockExclusive(pWal, WAL_CKPT_LOCK, 1); } return rc; } #endif /* SQLITE_ENABLE_SNAPSHOT */ /* ** Begin a read transaction on the database. ** ** This routine used to be called sqlite3OpenSnapshot() and with good reason: ** it takes a snapshot of the state of the WAL and wal-index for the current ** instant in time. The current thread will continue to use this snapshot. ** Other threads might append new content to the WAL and wal-index but |
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2437 2438 2439 2440 2441 2442 2443 | /* It is possible that there is a checkpointer thread running ** concurrent with this code. If this is the case, it may be that the ** checkpointer has already determined that it will checkpoint ** snapshot X, where X is later in the wal file than pSnapshot, but ** has not yet set the pInfo->nBackfillAttempted variable to indicate ** its intent. To avoid the race condition this leads to, ensure that ** there is no checkpointer process by taking a shared CKPT lock | | > > > > | 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 | /* It is possible that there is a checkpointer thread running ** concurrent with this code. If this is the case, it may be that the ** checkpointer has already determined that it will checkpoint ** snapshot X, where X is later in the wal file than pSnapshot, but ** has not yet set the pInfo->nBackfillAttempted variable to indicate ** its intent. To avoid the race condition this leads to, ensure that ** there is no checkpointer process by taking a shared CKPT lock ** before checking pInfo->nBackfillAttempted. ** ** TODO: Does the aReadMark[] lock prevent a checkpointer from doing ** this already? */ rc = walLockShared(pWal, WAL_CKPT_LOCK); if( rc==SQLITE_OK ){ /* Check that the wal file has not been wrapped. Assuming that it has ** not, also check that no checkpointer has attempted to checkpoint any ** frames beyond pSnapshot->mxFrame. If either of these conditions are ** true, return SQLITE_BUSY_SNAPSHOT. Otherwise, overwrite pWal->hdr |
︙ | ︙ | |||
3389 3390 3391 3392 3393 3394 3395 3396 3397 3398 3399 3400 3401 3402 3403 3404 3405 | /* Create a snapshot object. The content of a snapshot is opaque to ** every other subsystem, so the WAL module can put whatever it needs ** in the object. */ int sqlite3WalSnapshotGet(Wal *pWal, sqlite3_snapshot **ppSnapshot){ int rc = SQLITE_OK; WalIndexHdr *pRet; assert( pWal->readLock>=0 && pWal->writeLock==0 ); pRet = (WalIndexHdr*)sqlite3_malloc(sizeof(WalIndexHdr)); if( pRet==0 ){ rc = SQLITE_NOMEM_BKPT; }else{ memcpy(pRet, &pWal->hdr, sizeof(WalIndexHdr)); *ppSnapshot = (sqlite3_snapshot*)pRet; } | > > > > > | 3471 3472 3473 3474 3475 3476 3477 3478 3479 3480 3481 3482 3483 3484 3485 3486 3487 3488 3489 3490 3491 3492 | /* Create a snapshot object. The content of a snapshot is opaque to ** every other subsystem, so the WAL module can put whatever it needs ** in the object. */ int sqlite3WalSnapshotGet(Wal *pWal, sqlite3_snapshot **ppSnapshot){ int rc = SQLITE_OK; WalIndexHdr *pRet; static const u32 aZero[4] = { 0, 0, 0, 0 }; assert( pWal->readLock>=0 && pWal->writeLock==0 ); if( memcmp(&pWal->hdr.aFrameCksum[0],aZero,16)==0 ){ *ppSnapshot = 0; return SQLITE_ERROR; } pRet = (WalIndexHdr*)sqlite3_malloc(sizeof(WalIndexHdr)); if( pRet==0 ){ rc = SQLITE_NOMEM_BKPT; }else{ memcpy(pRet, &pWal->hdr, sizeof(WalIndexHdr)); *ppSnapshot = (sqlite3_snapshot*)pRet; } |
︙ | ︙ |
Changes to src/wal.h.
︙ | ︙ | |||
127 128 129 130 131 132 133 134 135 136 137 138 139 140 | ** WAL module is using shared-memory, return false. */ int sqlite3WalHeapMemory(Wal *pWal); #ifdef SQLITE_ENABLE_SNAPSHOT int sqlite3WalSnapshotGet(Wal *pWal, sqlite3_snapshot **ppSnapshot); void sqlite3WalSnapshotOpen(Wal *pWal, sqlite3_snapshot *pSnapshot); #endif #ifdef SQLITE_ENABLE_ZIPVFS /* If the WAL file is not empty, return the number of bytes of content ** stored in each frame (i.e. the db page-size when the WAL was created). */ int sqlite3WalFramesize(Wal *pWal); | > | 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 | ** WAL module is using shared-memory, return false. */ int sqlite3WalHeapMemory(Wal *pWal); #ifdef SQLITE_ENABLE_SNAPSHOT int sqlite3WalSnapshotGet(Wal *pWal, sqlite3_snapshot **ppSnapshot); void sqlite3WalSnapshotOpen(Wal *pWal, sqlite3_snapshot *pSnapshot); int sqlite3WalSnapshotRecover(Wal *pWal); #endif #ifdef SQLITE_ENABLE_ZIPVFS /* If the WAL file is not empty, return the number of bytes of content ** stored in each frame (i.e. the db page-size when the WAL was created). */ int sqlite3WalFramesize(Wal *pWal); |
︙ | ︙ |
Changes to test/snapshot.test.
︙ | ︙ | |||
22 23 24 25 26 27 28 | # "PRAGMA journal_mode=memory", which fails if the database is in wal mode # and there are one or more existing connections. if {[permutation]=="inmemory_journal"} { finish_test return } | > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > | | | | | > | | | | | | | | | | | | | | | | | | | | | > > > > > > > > | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | > | 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 | # "PRAGMA journal_mode=memory", which fails if the database is in wal mode # and there are one or more existing connections. if {[permutation]=="inmemory_journal"} { finish_test return } foreach {tn tcl} { 1 { proc snapshot_get {DB DBNAME} { uplevel [list sqlite3_snapshot_get $DB $DBNAME] } proc snapshot_open {DB DBNAME SNAPSHOT} { uplevel [list sqlite3_snapshot_open $DB $DBNAME $SNAPSHOT] } proc snapshot_free {SNAPSHOT} { uplevel [list sqlite3_snapshot_free $SNAPSHOT] } proc snapshot_cmp {SNAPSHOT1 SNAPSHOT2} { uplevel [list sqlite3_snapshot_cmp $SNAPSHOT1 $SNAPSHOT2] } } 2 { proc snapshot_get {DB DBNAME} { uplevel [list sqlite3_snapshot_get_blob $DB $DBNAME] } proc snapshot_open {DB DBNAME SNAPSHOT} { uplevel [list sqlite3_snapshot_open_blob $DB $DBNAME $SNAPSHOT] } proc snapshot_free {SNAPSHOT} { } proc snapshot_cmp {SNAPSHOT1 SNAPSHOT2} { uplevel [list sqlite3_snapshot_cmp_blob $SNAPSHOT1 $SNAPSHOT2] } } } { reset_db eval $tcl #------------------------------------------------------------------------- # Check some error conditions in snapshot_get(). It is an error if: # # 1) snapshot_get() is called on a non-WAL database, or # 2) there is an open write transaction on the database. # 3) the database handle is in auto-commit mode # do_execsql_test $tn.1.0 { CREATE TABLE t1(a, b); INSERT INTO t1 VALUES(1, 2); INSERT INTO t1 VALUES(3, 4); } do_test $tn.1.1.1 { execsql { BEGIN; SELECT * FROM t1; } list [catch { snapshot_get db main } msg] $msg } {1 SQLITE_ERROR} do_execsql_test $tn.1.1.2 COMMIT do_test $tn.1.2.1 { execsql { PRAGMA journal_mode = WAL; BEGIN; INSERT INTO t1 VALUES(5, 6); INSERT INTO t1 VALUES(7, 8); } list [catch { snapshot_get db main } msg] $msg } {1 SQLITE_ERROR} do_execsql_test $tn.1.2.2 COMMIT do_test $tn.1.3.1 { list [catch { snapshot_get db main } msg] $msg } {1 SQLITE_ERROR} do_test $tn.1.3.2 { db trans { set snap [snapshot_get db main] } snapshot_free $snap } {} #------------------------------------------------------------------------- # Check that a simple case works. Reuse the database created by the # block of tests above. # do_execsql_test $tn.2.1.0 { BEGIN; SELECT * FROM t1; } {1 2 3 4 5 6 7 8} do_test $tn.2.1.1 { set snapshot [snapshot_get db main] execsql { COMMIT; INSERT INTO t1 VALUES(9, 10); SELECT * FROM t1; } } {1 2 3 4 5 6 7 8 9 10} do_test $tn.2.1.2 { execsql BEGIN snapshot_open db main $snapshot execsql { SELECT * FROM t1; } } {1 2 3 4 5 6 7 8} do_test $tn.2.1.3 { snapshot_free $snapshot execsql COMMIT } {} do_test $tn.2.2.0 { sqlite3 db2 test.db execsql { BEGIN; SELECT * FROM t1; } db2 } {1 2 3 4 5 6 7 8 9 10} do_test $tn.2.2.1 { set snapshot [snapshot_get db2 main] execsql { INSERT INTO t1 VALUES(11, 12); SELECT * FROM t1; } } {1 2 3 4 5 6 7 8 9 10 11 12} do_test $tn.2.2.2 { execsql BEGIN snapshot_open db main $snapshot execsql { SELECT * FROM t1; } } {1 2 3 4 5 6 7 8 9 10} do_test $tn.2.2.3 { snapshot_free $snapshot execsql COMMIT execsql COMMIT db2 db2 close } {} do_test $tn.2.3.1 { execsql { DELETE FROM t1 WHERE a>6 } db trans { set snapshot [snapshot_get db main] } execsql { INSERT INTO t1 VALUES('a', 'b'); INSERT INTO t1 VALUES('c', 'd'); SELECT * FROM t1; } } {1 2 3 4 5 6 a b c d} do_test $tn.2.3.2 { execsql BEGIN snapshot_open db main $snapshot execsql { SELECT * FROM t1 } } {1 2 3 4 5 6} do_test $tn.2.3.3 { catchsql { INSERT INTO t1 VALUES('x','y') } } {1 {database is locked}} do_test $tn.2.3.4 { execsql COMMIT snapshot_free $snapshot } {} #------------------------------------------------------------------------- # Check some errors in snapshot_open(). It is an error if: # # 1) the db is in auto-commit mode, # 2) the db has an open (read or write) transaction, # 3) the db is not a wal database, # # Reuse the database created by earlier tests. # do_execsql_test $tn.3.0.0 { CREATE TABLE t2(x, y); INSERT INTO t2 VALUES('a', 'b'); INSERT INTO t2 VALUES('c', 'd'); BEGIN; SELECT * FROM t2; } {a b c d} do_test $tn.3.0.1 { set snapshot [snapshot_get db main] execsql { COMMIT } execsql { INSERT INTO t2 VALUES('e', 'f'); } } {} do_test $tn.3.1 { list [catch {snapshot_open db main $snapshot } msg] $msg } {1 SQLITE_ERROR} do_test $tn.3.2.1 { execsql { BEGIN; SELECT * FROM t2; } } {a b c d e f} do_test $tn.3.2.2 { list [catch {snapshot_open db main $snapshot } msg] $msg } {1 SQLITE_ERROR} do_test $tn.3.2.3 { execsql { COMMIT; BEGIN; INSERT INTO t2 VALUES('g', 'h'); } list [catch {snapshot_open db main $snapshot } msg] $msg } {1 SQLITE_ERROR} do_execsql_test $tn.3.2.4 COMMIT do_test $tn.3.3.1 { execsql { PRAGMA journal_mode = DELETE } execsql { BEGIN } list [catch {snapshot_open db main $snapshot } msg] $msg } {1 SQLITE_ERROR} do_test $tn.$tn.3.3.2 { snapshot_free $snapshot execsql COMMIT } {} #------------------------------------------------------------------------- # Check that SQLITE_BUSY_SNAPSHOT is returned if the specified snapshot # no longer exists because the wal file has been checkpointed. # # 1. Reading a snapshot from the middle of a wal file is not possible # after the wal file has been checkpointed. # # 2. That a snapshot from the end of a wal file can not be read once # the wal file has been wrapped. # do_execsql_test $tn.4.1.0 { PRAGMA journal_mode = wal; CREATE TABLE t3(i, j); INSERT INTO t3 VALUES('o', 't'); INSERT INTO t3 VALUES('t', 'f'); BEGIN; SELECT * FROM t3; } {wal o t t f} do_test $tn.4.1.1 { set snapshot [snapshot_get db main] execsql COMMIT } {} do_test $tn.4.1.2 { execsql { INSERT INTO t3 VALUES('f', 's'); BEGIN; } snapshot_open db main $snapshot execsql { SELECT * FROM t3 } } {o t t f} do_test $tn.4.1.3 { execsql { COMMIT; PRAGMA wal_checkpoint; BEGIN; } list [catch {snapshot_open db main $snapshot} msg] $msg } {1 SQLITE_BUSY_SNAPSHOT} do_test $tn.4.1.4 { snapshot_free $snapshot execsql COMMIT } {} do_test $tn.4.2.1 { execsql { INSERT INTO t3 VALUES('s', 'e'); INSERT INTO t3 VALUES('n', 't'); BEGIN; SELECT * FROM t3; } } {o t t f f s s e n t} do_test $tn.4.2.2 { set snapshot [snapshot_get db main] execsql { COMMIT; PRAGMA wal_checkpoint; BEGIN; } snapshot_open db main $snapshot execsql { SELECT * FROM t3 } } {o t t f f s s e n t} do_test $tn.4.2.3 { execsql { COMMIT; INSERT INTO t3 VALUES('e', 't'); BEGIN; } list [catch {snapshot_open db main $snapshot} msg] $msg } {1 SQLITE_BUSY_SNAPSHOT} do_test $tn.4.2.4 { snapshot_free $snapshot } {} #------------------------------------------------------------------------- # Check that SQLITE_BUSY is returned if a checkpoint is running when # sqlite3_snapshot_open() is called. # reset_db db close testvfs tvfs sqlite3 db test.db -vfs tvfs do_execsql_test $tn.5.1 { PRAGMA journal_mode = wal; CREATE TABLE x1(x, xx, xxx); INSERT INTO x1 VALUES('z', 'zz', 'zzz'); BEGIN; SELECT * FROM x1; } {wal z zz zzz} do_test $tn.5.2 { set ::snapshot [snapshot_get db main] sqlite3 db2 test.db -vfs tvfs execsql { INSERT INTO x1 VALUES('a', 'aa', 'aaa'); COMMIT; } } {} set t53 0 proc write_callback {args} { do_test $tn.5.3.[incr ::t53] { execsql BEGIN list [catch { snapshot_open db main $::snapshot } msg] $msg } {1 SQLITE_BUSY} catchsql COMMIT } tvfs filter xWrite tvfs script write_callback db2 eval { PRAGMA wal_checkpoint } db close db2 close tvfs delete snapshot_free $snapshot #------------------------------------------------------------------------- # Test that sqlite3_snapshot_get() may be called immediately after # "BEGIN; PRAGMA user_version;". And that sqlite3_snapshot_open() may # be called after opening the db handle and running the script # "PRAGMA user_version; BEGIN". reset_db do_execsql_test $tn.6.1 { PRAGMA journal_mode = wal; CREATE TABLE x1(x, xx, xxx); INSERT INTO x1 VALUES('z', 'zz', 'zzz'); BEGIN; PRAGMA user_version; } {wal 0} do_test $tn.6.2 { set ::snapshot [snapshot_get db main] execsql { INSERT INTO x1 VALUES('a', 'aa', 'aaa'); COMMIT; } } {} do_test $tn.6.3 { sqlite3 db2 test.db db2 eval "PRAGMA user_version ; BEGIN" snapshot_open db2 main $::snapshot db2 eval { SELECT * FROM x1 } } {z zz zzz} do_test $tn.6.4 { db2 close sqlite3 db2 test.db db2 eval "PRAGMA application_id" db2 eval "BEGIN" snapshot_open db2 main $::snapshot db2 eval { SELECT * FROM x1 } } {z zz zzz} do_test $tn.6.5 { db2 close sqlite3 db2 test.db db2 eval "BEGIN" list [catch {snapshot_open db2 main $::snapshot} msg] $msg } {1 SQLITE_ERROR} snapshot_free $snapshot #------------------------------------------------------------------------- # The following tests investigate the sqlite3_snapshot_cmp() API. # # Compare snapshots $p1 and $p2, checking that the result is $r. # proc do_snapshot_cmp_test {tn p1 p2 r} { uplevel [list do_test $tn.1 [list snapshot_cmp $p1 $p2] $r] uplevel [list do_test $tn.2 [list snapshot_cmp $p2 $p1] [expr $r*-1]] uplevel [list do_test $tn.3 [list snapshot_cmp $p1 $p1] 0] uplevel [list do_test $tn.4 [list snapshot_cmp $p2 $p2] 0] } catch { db2 close } reset_db do_execsql_test $tn.7.1 { PRAGMA journal_mode = wal; CREATE TABLE t1(x); } wal do_test $tn.7.1.2 { execsql { BEGIN ; PRAGMA application_id } set p1 [snapshot_get db main] execsql { INSERT INTO t1 VALUES(10); COMMIT; } execsql { BEGIN ; PRAGMA application_id } set p2 [snapshot_get db main] execsql COMMIT } {} do_snapshot_cmp_test $tn.7.1.3 $p1 $p2 -1 snapshot_free $p1 snapshot_free $p2 do_execsql_test $tn.7.2.1 { INSERT INTO t1 VALUES(11); INSERT INTO t1 VALUES(12); INSERT INTO t1 VALUES(13); BEGIN; PRAGMA application_id; } {0} do_test $tn.7.2.2 { set p1 [snapshot_get db main] execsql { COMMIT; INSERT INTO t1 VALUES(14); PRAGMA wal_checkpoint; BEGIN; PRAGMA application_id; } set p2 [snapshot_get db main] execsql COMMIT } {} do_snapshot_cmp_test $tn.7.2.3 $p1 $p2 -1 snapshot_free $p2 do_test $tn.7.3.1 { execsql { INSERT INTO t1 VALUES(14); BEGIN; PRAGMA application_id; } set p2 [snapshot_get db main] execsql COMMIT } {} do_snapshot_cmp_test $tn.7.3.2 $p1 $p2 -1 snapshot_free $p1 snapshot_free $p2 } finish_test |
Added test/snapshot2.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 | # 2016 November 18 # # 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 the sqlite3_snapshot_xxx() APIs. # set testdir [file dirname $argv0] source $testdir/tester.tcl ifcapable !snapshot {finish_test; return} set testprefix snapshot2 # This test does not work with the inmemory_journal permutation. The reason # is that each connection opened as part of this permutation executes # "PRAGMA journal_mode=memory", which fails if the database is in wal mode # and there are one or more existing connections. if {[permutation]=="inmemory_journal"} { finish_test return } #------------------------------------------------------------------------- # Check that it is not possible to obtain a snapshot immediately after # a wal mode database with an empty wal file is opened. But it is after # the file has been written, even by some other connection. # do_execsql_test 1.0 { PRAGMA journal_mode = wal; CREATE TABLE t1(a, b, c); INSERT INTO t1 VALUES(1, 2, 3); INSERT INTO t1 VALUES(4, 5, 6); } {wal} db close do_test 1.1.1 { list [file exists test.db] [file exists test.db-wal] } {1 0} sqlite3 db test.db do_execsql_test 1.1.2 { SELECT * FROM t1 } {1 2 3 4 5 6} do_test 1.1.3 { execsql BEGIN list [catch { sqlite3_snapshot_get_blob db main } msg] $msg } {1 SQLITE_ERROR} execsql COMMIT do_test 1.1.4 { execsql { INSERT INTO t1 VALUES(7, 8, 9) } execsql BEGIN string length [sqlite3_snapshot_get_blob db main] } 48 execsql COMMIT db close do_test 1.2.1 { list [file exists test.db] [file exists test.db-wal] } {1 0} sqlite3 db test.db do_execsql_test 1.2.2 { SELECT * FROM t1 } {1 2 3 4 5 6 7 8 9} do_test 1.2.3 { execsql BEGIN list [catch { sqlite3_snapshot_get_blob db main } msg] $msg } {1 SQLITE_ERROR} execsql COMMIT do_test 1.2.4 { sqlite3 db2 test.db execsql { INSERT INTO t1 VALUES(10, 11, 12) } db2 execsql BEGIN string length [sqlite3_snapshot_get_blob db main] } 48 execsql COMMIT db2 close #------------------------------------------------------------------------- # Simple tests for sqlite3_snapshot_recover(). # reset_db do_execsql_test 2.0 { CREATE TABLE t1(x); PRAGMA journal_mode = wal; INSERT INTO t1 VALUES(1); INSERT INTO t1 VALUES(2); } {wal} do_test 2.1 { db trans { set snap [sqlite3_snapshot_get_blob db main] } sqlite3_db_config db NO_CKPT_ON_CLOSE 1 db close sqlite3 db test.db execsql {SELECT * FROM sqlite_master} execsql BEGIN sqlite3_snapshot_open_blob db main $snap execsql COMMIT; execsql { INSERT INTO t1 VALUES(3); } } {} do_test 2.2 { sqlite3_db_config db NO_CKPT_ON_CLOSE 1 db close sqlite3 db test.db execsql {SELECT * FROM sqlite_master} execsql BEGIN list [catch { sqlite3_snapshot_open_blob db main $snap } msg] $msg } {1 SQLITE_BUSY_SNAPSHOT} do_test 2.3 { execsql COMMIT sqlite3_snapshot_recover db main execsql BEGIN sqlite3_snapshot_open_blob db main $snap execsql { SELECT * FROM t1 } } {1 2} do_test 2.4 { execsql COMMIT execsql { SELECT * FROM t1 } } {1 2 3} do_test 2.5 { execsql { PRAGMA wal_checkpoint } sqlite3_db_config db NO_CKPT_ON_CLOSE 1 db close sqlite3 db test.db sqlite3_snapshot_recover db main execsql BEGIN list [catch { sqlite3_snapshot_open_blob db main $snap } msg] $msg } {1 SQLITE_BUSY_SNAPSHOT} #------------------------------------------------------------------------- # Check that calling sqlite3_snapshot_recover() does not confuse the # pager cache. reset_db do_execsql_test 3.0 { PRAGMA journal_mode = wal; CREATE TABLE t1(x, y); INSERT INTO t1 VALUES('a', 'b'); INSERT INTO t1 VALUES('c', 'd'); } {wal} do_test 3.1 { sqlite3 db2 test.db execsql { INSERT INTO t1 VALUES('e', 'f') } db2 db2 close sqlite3_snapshot_recover db main } {} do_execsql_test 3.2 { SELECT * FROM t1; } {a b c d e f} #------------------------------------------------------------------------- # Check that sqlite3_snapshot_recover() returns an error if it is called # with an open read-transaction. Or on a database that does not exist. Or # on the temp database. Or on a db that is not in wal mode. # do_test 4.1 { sqlite3_snapshot_recover db main } {} do_test 4.2 { execsql { BEGIN; SELECT * FROM sqlite_master; } list [catch { sqlite3_snapshot_recover db main } msg] $msg } {1 SQLITE_ERROR} do_test 4.3 { execsql COMMIT sqlite3_snapshot_recover db main } {} do_test 4.4 { list [catch { sqlite3_snapshot_recover db aux } msg] $msg } {1 SQLITE_ERROR} do_test 4.5 { forcedelete test.db2 execsql { ATTACH 'test.db2' AS aux; PRAGMA aux.journal_mode = wal; CREATE TABLE aux.t2(x, y); } list [catch { sqlite3_snapshot_recover db aux } msg] $msg } {0 {}} do_test 4.6 { list [catch { sqlite3_snapshot_recover db temp } msg] $msg } {1 SQLITE_ERROR} do_test 4.7 { execsql { PRAGMA aux.journal_mode = delete; } list [catch { sqlite3_snapshot_recover db aux } msg] $msg } {1 SQLITE_ERROR} finish_test |
Changes to test/snapshot_fault.test.
︙ | ︙ | |||
154 155 156 157 158 159 160 161 162 163 164 | PRAGMA integrity_check; }] if {$res != "1 2 3 ok"} { error "res is $res" } } sqlite3_snapshot_free $::snapshot } finish_test | > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > | 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 | PRAGMA integrity_check; }] if {$res != "1 2 3 ok"} { error "res is $res" } } sqlite3_snapshot_free $::snapshot } #------------------------------------------------------------------------- # Test the handling of faults that occur within sqlite3_snapshot_recover(). # reset_db do_execsql_test 4.0 { PRAGMA journal_mode = wal; CREATE TABLE t1(zzz); INSERT INTO t1 VALUES('abc'); INSERT INTO t1 VALUES('def'); } {wal} faultsim_save_and_close do_test 4.0.1 { faultsim_restore_and_reopen db eval { SELECT * FROM sqlite_master } sqlite3_snapshot_recover db main } {} db close do_faultsim_test 4.0 -faults oom* -prep { faultsim_restore_and_reopen db eval { SELECT * FROM sqlite_master } } -body { sqlite3_snapshot_recover db main } -test { faultsim_test_result {0 {}} {1 SQLITE_NOMEM} {1 SQLITE_IOERR_NOMEM} } # The following test cases contrive to call sqlite3_snapshot_recover() # before all pages of the *-shm file have been mapped. This tests an # extra branch of error handling logic in snapshot_recover(). # reset_db do_execsql_test 4.1.0 { PRAGMA page_size = 512; PRAGMA journal_mode = wal; PRAGMA wal_autocheckpoint = 0; CREATE TABLE t1(zzz); INSERT INTO t1 VALUES(randomblob( 500 * 9500 )); PRAGMA user_version = 211; } {wal 0} do_test 4.1.1 { list [file size test.db-shm] [file size test.db] } {98304 512} faultsim_save_and_close do_faultsim_test 4.1 -faults shm* -prep { catch { db2 close } catch { db close } faultsim_restore_and_reopen sqlite3 db2 test.db db2 eval { SELECT * FROM sqlite_master } db eval BEGIN sqlite3_snapshot_get_blob db main db eval COMMIT } -body { sqlite3_snapshot_recover db main } -test { faultsim_test_result {0 {}} {1 SQLITE_IOERR} } finish_test |