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Add the experimental sqlite3_stmt_scanstatus() API.

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FossilOrigin-Name: 6a9bab34aeb6a01b612211a28c140de60a3e883c
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dan
2014-10-31 20:11:32 +00:00
parent 0fb5daed34
commit 04489b6dce
12 changed files with 394 additions and 31 deletions
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37
src/vdbeapi.c
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@@ -1475,3 +1475,40 @@ int sqlite3_stmt_status(sqlite3_stmt *pStmt, int op, int resetFlag){
if( resetFlag ) pVdbe->aCounter[op] = 0;
return (int)v;
}
/*
** Return status data for a single loop within query pStmt.
*/
int sqlite3_stmt_scanstatus(
sqlite3_stmt *pStmt,
int idx, /* Index of loop to report on */
sqlite3_int64 *pnLoop, /* OUT: Number of times loop was run */
sqlite3_int64 *pnVisit, /* OUT: Number of rows visited (all loops) */
sqlite3_int64 *pnEst, /* OUT: Number of rows estimated (per loop) */
const char **pzName, /* OUT: Object name (table or index) */
const char **pzExplain /* OUT: EQP string */
){
Vdbe *p = (Vdbe*)pStmt;
ExplainArg *pExplain;
if( idx<0 || idx>=p->nExplain ) return 1;
pExplain = p->apExplain[idx];
if( pnLoop ) *pnLoop = pExplain->nLoop;
if( pnVisit ) *pnVisit = pExplain->nVisit;
if( pnEst ) *pnEst = pExplain->nEst;
if( *pzName ) *pzName = pExplain->zName;
if( *pzExplain ) *pzExplain = pExplain->zExplain;
return 0;
}
/*
** Zero all counters associated with the sqlite3_stmt_scanstatus() data.
*/
void sqlite3_stmt_scanstatus_reset(sqlite3_stmt *pStmt){
Vdbe *p = (Vdbe*)pStmt;
int i;
for(i=0; i<p->nExplain; i++){
p->apExplain[i]->nLoop = 0;
p->apExplain[i]->nVisit = 0;
}
}