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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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90
src/vdbe.c
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@@ -3868,6 +3868,24 @@ case OP_InsertInt: {
iKey = pOp->p3;
}
if( pOp->p4.z && (db->xPreUpdateCallback || db->xUpdateCallback) ){
assert( pC->isTable );
assert( pC->iDb>=0 );
zDb = db->aDb[pC->iDb].zName;
zTbl = pOp->p4.z;
op = ((pOp->p5 & OPFLAG_ISUPDATE) ? SQLITE_UPDATE : SQLITE_INSERT);
}
/* Invoke the pre-update hook, if any */
if( db->xPreUpdateCallback
&& pOp->p4.z
&& (!(pOp->p5 & OPFLAG_ISUPDATE) || pC->rowidIsValid==0)
){
sqlite3VdbePreUpdateHook(p, pC,
pC->rowidIsValid ? op : SQLITE_INSERT, zDb, zTbl, iKey, iKey
);
}
if( pOp->p5 & OPFLAG_NCHANGE ) p->nChange++;
if( pOp->p5 & OPFLAG_LASTROWID ) db->lastRowid = iKey;
if( pData->flags & MEM_Null ){
@@ -3893,17 +3911,12 @@ case OP_InsertInt: {
/* Invoke the update-hook if required. */
if( rc==SQLITE_OK && db->xUpdateCallback && pOp->p4.z ){
zDb = db->aDb[pC->iDb].zName;
zTbl = pOp->p4.z;
op = ((pOp->p5 & OPFLAG_ISUPDATE) ? SQLITE_UPDATE : SQLITE_INSERT);
assert( pC->isTable );
db->xUpdateCallback(db->pUpdateArg, op, zDb, zTbl, iKey);
assert( pC->iDb>=0 );
}
break;
}
/* Opcode: Delete P1 P2 * P4 *
/* Opcode: Delete P1 P2 P3 P4 *
**
** Delete the record at which the P1 cursor is currently pointing.
**
@@ -3918,30 +3931,31 @@ case OP_InsertInt: {
** P1 must not be pseudo-table. It has to be a real table with
** multiple rows.
**
** If P4 is not NULL, then it is the name of the table that P1 is
** pointing to. The update hook will be invoked, if it exists.
** If P4 is not NULL then the P1 cursor must have been positioned
** using OP_NotFound prior to invoking this opcode.
** If P4 is not NULL then, either the update or pre-update hook, or both,
** may be invoked. The P1 cursor must have been positioned using OP_NotFound
** prior to invoking this opcode in this case. Specifically, if one is
** configured, the pre-update hook is invoked if P4 is not NULL. The
** update-hook is invoked if one is configured, P4 is not NULL, and the
** OPFLAG_NCHANGE flag is set in P2.
**
** If the OPFLAG_ISUPDATE flag is set in P2, then P3 contains the address
** of the memory cell that contains the value that the rowid of the row will
** be set to by the update.
*/
case OP_Delete: {
i64 iKey;
VdbeCursor *pC;
const char *zDb;
const char *zTbl;
int opflags;
opflags = pOp->p2;
iKey = 0;
assert( pOp->p1>=0 && pOp->p1<p->nCursor );
pC = p->apCsr[pOp->p1];
assert( pC!=0 );
assert( pC->pCursor!=0 ); /* Only valid for real tables, no pseudotables */
/* If the update-hook will be invoked, set iKey to the rowid of the
** row being deleted.
*/
if( db->xUpdateCallback && pOp->p4.z ){
assert( pC->isTable );
assert( pC->rowidIsValid ); /* lastRowid set by previous OP_NotFound */
iKey = pC->lastRowid;
}
/* The OP_Delete opcode always follows an OP_NotExists or OP_Last or
** OP_Column on the same table without any intervening operations that
** might move or invalidate the cursor. Hence cursor pC is always pointing
@@ -3953,18 +3967,42 @@ case OP_Delete: {
rc = sqlite3VdbeCursorMoveto(pC);
if( NEVER(rc!=SQLITE_OK) ) goto abort_due_to_error;
/* If the update-hook or pre-update-hook will be invoked, set iKey to
** the rowid of the row being deleted. Set zDb and zTab as well.
*/
if( pOp->p4.z && (db->xPreUpdateCallback || db->xUpdateCallback) ){
assert( pC->iDb>=0 );
assert( pC->isTable );
assert( pC->rowidIsValid ); /* lastRowid set by previous OP_NotFound */
iKey = pC->lastRowid;
zDb = db->aDb[pC->iDb].zName;
zTbl = pOp->p4.z;
}
/* Invoke the pre-update-hook if required. */
if( db->xPreUpdateCallback && pOp->p4.z ){
assert( !(opflags & OPFLAG_ISUPDATE) || (aMem[pOp->p3].flags & MEM_Int) );
sqlite3VdbePreUpdateHook(p, pC,
(opflags & OPFLAG_ISUPDATE) ? SQLITE_UPDATE : SQLITE_DELETE,
zDb, zTbl, iKey,
(opflags & OPFLAG_ISUPDATE) ? aMem[pOp->p3].u.i : iKey
);
}
if( opflags & OPFLAG_ISNOOP ) break;
sqlite3BtreeSetCachedRowid(pC->pCursor, 0);
rc = sqlite3BtreeDelete(pC->pCursor);
pC->cacheStatus = CACHE_STALE;
/* Invoke the update-hook if required. */
if( rc==SQLITE_OK && db->xUpdateCallback && pOp->p4.z ){
const char *zDb = db->aDb[pC->iDb].zName;
const char *zTbl = pOp->p4.z;
db->xUpdateCallback(db->pUpdateArg, SQLITE_DELETE, zDb, zTbl, iKey);
assert( pC->iDb>=0 );
/* Update the change-counter and invoke the update-hook if required. */
if( opflags & OPFLAG_NCHANGE ){
p->nChange++;
assert( pOp->p4.z );
if( rc==SQLITE_OK && db->xUpdateCallback ){
db->xUpdateCallback(db->pUpdateArg, SQLITE_DELETE, zDb, zTbl, iKey);
}
}
if( pOp->p2 & OPFLAG_NCHANGE ) p->nChange++;
break;
}
/* Opcode: ResetCount * * * * *