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Add the experimental sqlite3_reoptimize() API.

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FossilOrigin-Name: 9bd6f3d8864d422fe42074688b191915b27ad8ea
This commit is contained in:
dan
2009-10-15 18:35:38 +00:00
parent 9bd42e96ac
commit 937d0dea4f
17 changed files with 880 additions and 84 deletions
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39
src/vdbeapi.c
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@@ -914,6 +914,21 @@ static int vdbeUnbind(Vdbe *p, int i){
sqlite3VdbeMemRelease(pVar);
pVar->flags = MEM_Null;
sqlite3Error(p->db, SQLITE_OK, 0);
/* If the bit corresponding to this variable is set in Vdbe.opmask, set
** the optimizable flag before returning. This tells the sqlite3_reoptimize()
** function that the VM program may benefit from recompilation.
**
** If the bit in Vdbe.expmask is set, then binding a new value to this
** variable invalidates the current query plan. This comes about when the
** variable is the RHS of a LIKE or GLOB operator and the LIKE/GLOB is
** able to use an index. */
if( (i<32 && p->optmask & ((u32)1 << i)) || p->optmask==0xffffffff ){
p->optimizable = 1;
}
if( (i<32 && p->expmask & ((u32)1 << i)) || p->expmask==0xffffffff ){
p->expired = 1;
}
return SQLITE_OK;
}
@@ -1205,3 +1220,27 @@ int sqlite3_stmt_status(sqlite3_stmt *pStmt, int op, int resetFlag){
if( resetFlag ) pVdbe->aCounter[op-1] = 0;
return v;
}
/*
** If possible, optimize the statement for the current bindings.
*/
int sqlite3_reoptimize(sqlite3_stmt *pStmt){
int rc = SQLITE_OK;
Vdbe *v = (Vdbe *)pStmt;
sqlite3 *db = v->db;
sqlite3_mutex_enter(db->mutex);
if( v->isPrepareV2==0 || v->pc>0 ){
rc = SQLITE_MISUSE;
}else if( v->optimizable ){
sqlite3 *db = v->db;
sqlite3_mutex_enter(db->mutex);
rc = sqlite3Reprepare(v);
rc = sqlite3ApiExit(db, rc);
}
assert( rc!=SQLITE_OK || v->optimizable==0 );
sqlite3_mutex_leave(db->mutex);
return rc;
}