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Overview
Comment: | Performance optimization to sqlite3_blob_read(). |
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Downloads: | Tarball | ZIP archive |
Timelines: | family | ancestors | descendants | both | trunk |
Files: | files | file ages | folders |
SHA1: |
7459f4b7ed4007d9ec44c3bf0fcba04f |
User & Date: | drh 2017-01-26 16:54:47.281 |
Context
2017-01-26
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17:11 | Performance optimization in sqlite3VdbeCloseStatement(). (check-in: 1e96e5ec1e user: drh tags: trunk) | |
16:54 | Performance optimization to sqlite3_blob_read(). (check-in: 7459f4b7ed user: drh tags: trunk) | |
16:27 | Minor simplification and performance optimization for Direct Overflow Read. (check-in: 3e96d6efa8 user: drh tags: trunk) | |
Changes
Changes to src/btree.c.
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4661 4662 4663 4664 4665 4666 4667 4668 | int sqlite3BtreePayload(BtCursor *pCur, u32 offset, u32 amt, void *pBuf){ assert( cursorHoldsMutex(pCur) ); assert( pCur->eState==CURSOR_VALID ); assert( pCur->iPage>=0 && pCur->apPage[pCur->iPage] ); assert( pCur->aiIdx[pCur->iPage]<pCur->apPage[pCur->iPage]->nCell ); return accessPayload(pCur, offset, amt, (unsigned char*)pBuf, 0); } #ifndef SQLITE_OMIT_INCRBLOB | > > > > > > > | > > > > | > > | | < | > > < | 4661 4662 4663 4664 4665 4666 4667 4668 4669 4670 4671 4672 4673 4674 4675 4676 4677 4678 4679 4680 4681 4682 4683 4684 4685 4686 4687 4688 4689 4690 4691 4692 4693 4694 4695 4696 4697 4698 4699 4700 4701 4702 | int sqlite3BtreePayload(BtCursor *pCur, u32 offset, u32 amt, void *pBuf){ assert( cursorHoldsMutex(pCur) ); assert( pCur->eState==CURSOR_VALID ); assert( pCur->iPage>=0 && pCur->apPage[pCur->iPage] ); assert( pCur->aiIdx[pCur->iPage]<pCur->apPage[pCur->iPage]->nCell ); return accessPayload(pCur, offset, amt, (unsigned char*)pBuf, 0); } /* ** This variant of sqlite3BtreePayload() works even if the cursor has not ** in the CURSOR_VALID state. It is only used by the sqlite3_blob_read() ** interface. */ #ifndef SQLITE_OMIT_INCRBLOB static SQLITE_NOINLINE int accessPayloadChecked( BtCursor *pCur, u32 offset, u32 amt, void *pBuf ){ int rc; if ( pCur->eState==CURSOR_INVALID ){ return SQLITE_ABORT; } assert( cursorOwnsBtShared(pCur) ); rc = restoreCursorPosition(pCur); return rc ? rc : accessPayload(pCur, offset, amt, pBuf, 0); } int sqlite3BtreePayloadChecked(BtCursor *pCur, u32 offset, u32 amt, void *pBuf){ if( pCur->eState==CURSOR_VALID ){ assert( cursorOwnsBtShared(pCur) ); return accessPayload(pCur, offset, amt, pBuf, 0); }else{ return accessPayloadChecked(pCur, offset, amt, pBuf); } } #endif /* SQLITE_OMIT_INCRBLOB */ /* ** Return a pointer to payload information from the entry that the ** pCur cursor is pointing to. The pointer is to the beginning of ** the key if index btrees (pPage->intKey==0) and is the data for |
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