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Overview
Comment: | Avoid opening a statement journal on single-row UPDATEs without triggers or FK constraints. |
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Downloads: | Tarball | ZIP archive |
Timelines: | family | ancestors | descendants | both | trunk |
Files: | files | file ages | folders |
SHA3-256: |
2772404b8c570caf3c31d2b0530cf347 |
User & Date: | drh 2018-04-20 19:32:35.766 |
Context
2018-04-20
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19:46 | Avoid the use of statement journals on DELETEs of a single row without triggers or foreign keys. (check-in: 20bf580080 user: drh tags: trunk) | |
19:32 | Avoid opening a statement journal on single-row UPDATEs without triggers or FK constraints. (check-in: 2772404b8c user: drh tags: trunk) | |
18:01 | Fix a VDBE comment on upsert. Provide an error message when upsert detects index corruption. (check-in: 279c48f606 user: drh tags: trunk) | |
Changes
Changes to src/update.c.
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335 336 337 338 339 340 341 | memset(aToOpen, 1, nIdx+1); } /* Begin generating code. */ v = sqlite3GetVdbe(pParse); if( v==0 ) goto update_cleanup; if( pParse->nested==0 ) sqlite3VdbeCountChanges(v); | | | 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 | memset(aToOpen, 1, nIdx+1); } /* Begin generating code. */ v = sqlite3GetVdbe(pParse); if( v==0 ) goto update_cleanup; if( pParse->nested==0 ) sqlite3VdbeCountChanges(v); sqlite3BeginWriteOperation(pParse, pTrigger || hasFK, iDb); /* Allocate required registers. */ if( !IsVirtual(pTab) ){ regRowSet = ++pParse->nMem; regOldRowid = regNewRowid = ++pParse->nMem; if( chngPk || pTrigger || hasFK ){ regOld = pParse->nMem + 1; |
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452 453 454 455 456 457 458 | ** ** UPDATE t1 SET b=b+1 WHERE b>? ** ** Fall back to ONEPASS_OFF if where.c has selected a ONEPASS_MULTI ** strategy that uses an index for which one or more columns are being ** updated. */ eOnePass = sqlite3WhereOkOnePass(pWInfo, aiCurOnePass); | > > | | | | | | > | 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 | ** ** UPDATE t1 SET b=b+1 WHERE b>? ** ** Fall back to ONEPASS_OFF if where.c has selected a ONEPASS_MULTI ** strategy that uses an index for which one or more columns are being ** updated. */ eOnePass = sqlite3WhereOkOnePass(pWInfo, aiCurOnePass); if( eOnePass!=ONEPASS_SINGLE ){ sqlite3MultiWrite(pParse); if( eOnePass==ONEPASS_MULTI ){ int iCur = aiCurOnePass[1]; if( iCur>=0 && iCur!=iDataCur && aToOpen[iCur-iBaseCur] ){ eOnePass = ONEPASS_OFF; } assert( iCur!=iDataCur || !HasRowid(pTab) ); } } } if( HasRowid(pTab) ){ /* Read the rowid of the current row of the WHERE scan. In ONEPASS_OFF ** mode, write the rowid into the FIFO. In either of the one-pass modes, ** leave it in register regOldRowid. */ |
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880 881 882 883 884 885 886 | sqlite3VdbeAddOp2(v, OP_SCopy, regArg+2+iPk, regArg+1); } bOnePass = sqlite3WhereOkOnePass(pWInfo, aDummy); if( bOnePass ){ /* If using the onepass strategy, no-op out the OP_OpenEphemeral coded | | < < < < > | 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 | sqlite3VdbeAddOp2(v, OP_SCopy, regArg+2+iPk, regArg+1); } bOnePass = sqlite3WhereOkOnePass(pWInfo, aDummy); if( bOnePass ){ /* If using the onepass strategy, no-op out the OP_OpenEphemeral coded ** above. */ sqlite3VdbeChangeToNoop(v, addr); }else{ /* Create a record from the argument register contents and insert it into ** the ephemeral table. */ sqlite3MultiWrite(pParse); sqlite3VdbeAddOp3(v, OP_MakeRecord, regArg, nArg, regRec); #ifdef SQLITE_DEBUG /* Signal an assert() within OP_MakeRecord that it is allowed to ** accept no-change records with serial_type 10 */ sqlite3VdbeChangeP5(v, OPFLAG_NOCHNG_MAGIC); #endif sqlite3VdbeAddOp2(v, OP_NewRowid, ephemTab, regRowid); |
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