/*
** Execute the statement pStmt, either until a row of data is ready, the
** statement is completely executed or an error occurs.
**
** This routine implements the bulk of the logic behind the sqlite_step()
** API. The only thing omitted is the automatic recompile if a
** schema change has occurred. That detail is handled by the
** outer sqlite3_step() wrapper procedure.
*/
static int sqlite3Step(Vdbe *p){
sqlite3 *db;
int rc;
/* Assert that malloc() has not failed */
assert( !sqlite3MallocFailed() );
if( p==0 || p->magic!=VDBE_MAGIC_RUN ){
return SQLITE_MISUSE;
}
if( p->aborted ){
return SQLITE_ABORT;
}
if( p->pc<=0 && p->expired ){
if( p->rc==SQLITE_OK ){
p->rc = SQLITE_SCHEMA;
}
rc = SQLITE_ERROR;
goto end_of_step;
}
db = p->db;
if( sqlite3SafetyOn(db) ){
p->rc = SQLITE_MISUSE;
return SQLITE_MISUSE;
}
if( p->pc<0 ){
/* If there are no other statements currently running, then
** reset the interrupt flag. This prevents a call to sqlite3_interrupt
** from interrupting a statement that has not yet started.
*/
if( db->activeVdbeCnt==0 ){
db->u1.isInterrupted = 0;
}
#ifndef SQLITE_OMIT_TRACE
/* Invoke the trace callback if there is one
*/
if( db->xTrace && !db->init.busy ){
assert( p->nOp>0 );
assert( p->aOp[p->nOp-1].opcode==OP_Noop );
assert( p->aOp[p->nOp-1].p3!=0 );
assert( p->aOp[p->nOp-1].p3type==P3_DYNAMIC );
sqlite3SafetyOff(db);
db->xTrace(db->pTraceArg, p->aOp[p->nOp-1].p3);
if( sqlite3SafetyOn(db) ){
p->rc = SQLITE_MISUSE;
return SQLITE_MISUSE;
}
}
if( db->xProfile && !db->init.busy ){
double rNow;
sqlite3OsCurrentTime(&rNow);
p->startTime = (rNow - (int)rNow)*3600.0*24.0*1000000000.0;
}
#endif
/* Print a copy of SQL as it is executed if the SQL_TRACE pragma is turned
** on in debugging mode.
*/
#ifdef SQLITE_DEBUG
if( (db->flags & SQLITE_SqlTrace)!=0 ){
sqlite3DebugPrintf("SQL-trace: %s\n", p->aOp[p->nOp-1].p3);
}
#endif /* SQLITE_DEBUG */
db->activeVdbeCnt++;
p->pc = 0;
}
#ifndef SQLITE_OMIT_EXPLAIN
if( p->explain ){
rc = sqlite3VdbeList(p);
}else
#endif /* SQLITE_OMIT_EXPLAIN */
{
rc = sqlite3VdbeExec(p);
}
if( sqlite3SafetyOff(db) ){
rc = SQLITE_MISUSE;
}
#ifndef SQLITE_OMIT_TRACE
/* Invoke the profile callback if there is one
*/
if( rc!=SQLITE_ROW && db->xProfile && !db->init.busy ){
double rNow;
u64 elapseTime;
sqlite3OsCurrentTime(&rNow);
elapseTime = (rNow - (int)rNow)*3600.0*24.0*1000000000.0 - p->startTime;
assert( p->nOp>0 );
assert( p->aOp[p->nOp-1].opcode==OP_Noop );
assert( p->aOp[p->nOp-1].p3!=0 );
assert( p->aOp[p->nOp-1].p3type==P3_DYNAMIC );
db->xProfile(db->pProfileArg, p->aOp[p->nOp-1].p3, elapseTime);
}
#endif
sqlite3Error(p->db, rc, 0);
p->rc = sqlite3ApiExit(p->db, p->rc);
end_of_step:
assert( (rc&0xff)==rc );
if( p->zSql && (rc&0xff)<SQLITE_ROW ){
/* This behavior occurs if sqlite3_prepare_v2() was used to build
** the prepared statement. Return error codes directly */
return p->rc;
}else{
/* This is for legacy sqlite3_prepare() builds and when the code
** is SQLITE_ROW or SQLITE_DONE */
return rc;
}
}
/*
** Execute the statement pStmt, either until a row of data is ready, the
** statement is completely executed or an error occurs.
*/
int sqlite3_step(sqlite3_stmt *pStmt){
Vdbe *p = (Vdbe*)pStmt;
sqlite3 *db;
int rc;
if( p==0 || p->magic!=VDBE_MAGIC_RUN ){
return SQLITE_MISUSE;
}
if( p->aborted ){
return SQLITE_ABORT;
}
if( p->pc<=0 && p->expired ){
if( p->rc==SQLITE_OK ){
p->rc = SQLITE_SCHEMA;
}
return SQLITE_ERROR;
}
db = p->db;
if( sqlite3SafetyOn(db) ){
p->rc = SQLITE_MISUSE;
return SQLITE_MISUSE;
}
if( p->pc<0 ){
#ifndef SQLITE_OMIT_TRACE
/* Invoke the trace callback if there is one
*/
if( db->xTrace && !db->init.busy ){
assert( p->nOp>0 );
assert( p->aOp[p->nOp-1].opcode==OP_Noop );
assert( p->aOp[p->nOp-1].p3!=0 );
assert( p->aOp[p->nOp-1].p3type==P3_DYNAMIC );
sqlite3SafetyOff(db);
db->xTrace(db->pTraceArg, p->aOp[p->nOp-1].p3);
if( sqlite3SafetyOn(db) ){
p->rc = SQLITE_MISUSE;
return SQLITE_MISUSE;
}
}
if( db->xProfile && !db->init.busy ){
double rNow;
sqlite3OsCurrentTime(&rNow);
p->startTime = (rNow - (int)rNow)*3600.0*24.0*1000000000.0;
}
#endif
/* Print a copy of SQL as it is executed if the SQL_TRACE pragma is turned
** on in debugging mode.
*/
#ifdef SQLITE_DEBUG
if( (db->flags & SQLITE_SqlTrace)!=0 ){
sqlite3DebugPrintf("SQL-trace: %s\n", p->aOp[p->nOp-1].p3);
}
#endif /* SQLITE_DEBUG */
db->activeVdbeCnt++;
p->pc = 0;
}
#ifndef SQLITE_OMIT_EXPLAIN
if( p->explain ){
rc = sqlite3VdbeList(p);
}else
#endif /* SQLITE_OMIT_EXPLAIN */
{
rc = sqlite3VdbeExec(p);
}
if( sqlite3SafetyOff(db) ){
rc = SQLITE_MISUSE;
}
#ifndef SQLITE_OMIT_TRACE
/* Invoke the profile callback if there is one
*/
if( rc!=SQLITE_ROW && db->xProfile && !db->init.busy ){
double rNow;
u64 elapseTime;
sqlite3OsCurrentTime(&rNow);
elapseTime = (rNow - (int)rNow)*3600.0*24.0*1000000000.0 - p->startTime;
assert( p->nOp>0 );
assert( p->aOp[p->nOp-1].opcode==OP_Noop );
assert( p->aOp[p->nOp-1].p3!=0 );
assert( p->aOp[p->nOp-1].p3type==P3_DYNAMIC );
db->xProfile(db->pProfileArg, p->aOp[p->nOp-1].p3, elapseTime);
}
#endif
sqlite3Error(p->db, rc, p->zErrMsg ? "%s" : 0, p->zErrMsg);
return rc;
}
