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Refactor the interface to make it more easily extensible.

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FossilOrigin-Name: 7955342da4a35b57e4ae26690b8d40f7bba20e8f
This commit is contained in:
drh
2014-11-03 16:35:55 +00:00
parent e2f771b047
commit d1a1c23423
5 changed files with 102 additions and 65 deletions
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46
src/vdbeapi.c
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@@ -1481,27 +1481,42 @@ int sqlite3_stmt_status(sqlite3_stmt *pStmt, int op, int resetFlag){
** Return status data for a single loop within query pStmt.
*/
int sqlite3_stmt_scanstatus(
sqlite3_stmt *pStmt,
sqlite3_stmt *pStmt, /* Prepared statement being queried */
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 */
int iScanStatusOp, /* Which metric to return */
void *pOut /* OUT: Write the answer here */
){
Vdbe *p = (Vdbe*)pStmt;
ScanStatus *pScan;
if( idx<0 || idx>=p->nScan ) return 1;
pScan = &p->aScan[idx];
if( pnLoop ) *pnLoop = p->anExec[pScan->addrLoop];
if( pnVisit ) *pnVisit = p->anExec[pScan->addrVisit];
if( pnEst ) *pnEst = pScan->nEst;
if( *pzName ) *pzName = pScan->zName;
if( *pzExplain ){
if( pScan->addrExplain ){
*pzExplain = p->aOp[ pScan->addrExplain ].p4.z;
}else{
*pzExplain = 0;
switch( iScanStatusOp ){
case SQLITE_SCANSTAT_NLOOP: {
*(sqlite3_int64*)pOut = p->anExec[pScan->addrLoop];
break;
}
case SQLITE_SCANSTAT_NVISIT: {
*(sqlite3_int64*)pOut = p->anExec[pScan->addrVisit];
break;
}
case SQLITE_SCANSTAT_EST: {
*(sqlite3_int64*)pOut = pScan->nEst;
break;
}
case SQLITE_SCANSTAT_NAME: {
*(const char**)pOut = pScan->zName
break;
}
case SQLITE_SCANSTAT_EXPLAIN: {
if( pScan->addrExplain ){
*(const char**)pOut = p->aOp[ pScan->addrExplain ].p4.z;
}else{
*(const char**)pOut = 0;
}
break;
}
default: {
return 1;
}
}
return 0;
@@ -1515,4 +1530,3 @@ void sqlite3_stmt_scanstatus_reset(sqlite3_stmt *pStmt){
memset(p->anExec, 0, p->nOp * sizeof(i64));
}
#endif /* SQLITE_ENABLE_STMT_SCANSTATUS */