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Add the experimental sqlite3_preupdate_hook() API.

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FossilOrigin-Name: 6145d7b89f83500318713779c60f79a7ab2098ba
This commit is contained in:
dan
2011-03-01 18:42:07 +00:00
parent 30f776fadb
commit 46c47d4677
18 changed files with 737 additions and 117 deletions
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34
src/vdbeaux.c
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@@ -2830,7 +2830,7 @@ void sqlite3VdbeDeleteUnpackedRecord(UnpackedRecord *p){
** strings and blobs static. And none of the elements are
** ever transformed, so there is never anything to delete.
*/
if( NEVER(pMem->zMalloc) ) sqlite3VdbeMemRelease(pMem);
if( pMem->zMalloc ) sqlite3VdbeMemRelease(pMem);
}
if( p->flags & UNPACKED_NEED_FREE ){
sqlite3DbFree(p->pKeyInfo->db, p);
@@ -3162,3 +3162,35 @@ void sqlite3VdbeSetVarmask(Vdbe *v, int iVar){
v->expmask |= ((u32)1 << (iVar-1));
}
}
/*
** Invoke the pre-update hook. If this is an UPDATE or DELETE pre-update call,
** then cursor passed as the second argument should point to the row about
** to be update or deleted. If the application calls sqlite3_preupdate_old(),
** the required value will be read from the row the cursor points to.
*/
void sqlite3VdbePreUpdateHook(
Vdbe *v, /* Vdbe pre-update hook is invoked by */
VdbeCursor *pCsr, /* Cursor to grab old.* values from */
int op, /* SQLITE_INSERT, UPDATE or DELETE */
const char *zDb, /* Database name */
const char *zTbl, /* Table name */
i64 iKey1, /* Initial key value */
i64 iKey2 /* Final key value */
){
sqlite3 *db = v->db;
PreUpdate preupdate;
memset(&preupdate, 0, sizeof(PreUpdate));
preupdate.pCsr = pCsr;
preupdate.op = op;
db->pPreUpdate = &preupdate;
db->xPreUpdateCallback(db->pPreUpdateArg, db, op, zDb, zTbl, iKey1, iKey2);
db->pPreUpdate = 0;
sqlite3DbFree(db, preupdate.aRecord);
if( preupdate.pUnpacked ){
sqlite3VdbeDeleteUnpackedRecord(preupdate.pUnpacked);
}
}