ODBC: fixed consistence of return of QODBCResult::exec()

The QODBCResult::exec() returns false when query is an delete
with no data do delete caused by SQLExecute function returning
SQL_NO_DATA, but the false return means error on execution.

Task-number:  QTBUG-10569
Change-Id: I6c7ebadcf62ab404b60c7bcccdab6a10bf16a923
Reviewed-by: Mark Brand <[email protected]>
(cherry-picked from qtbase commit 0646d1131b4bc65cdd9af29f4ce00fdd2398a3df)
Reviewed-by: Andy Shaw <[email protected]>

Author: israelins85

src/sql/drivers/odbc/qsql_odbc.cpp

@@ -1598,7 +1598,7 @@ bool QODBCResult::exec()
         }
     }
     r = SQLExecute(d->hStmt);
-    if (r != SQL_SUCCESS && r != SQL_SUCCESS_WITH_INFO) {
+    if (r != SQL_SUCCESS && r != SQL_SUCCESS_WITH_INFO && r != SQL_NO_DATA) {
         qWarning() << "QODBCResult::exec: Unable to execute statement:" << qODBCWarn(d);
         setLastError(qMakeError(QCoreApplication::translate("QODBCResult",
                      "Unable to execute statement"), QSqlError::StatementError, d));

tests/auto/qsqlquery/tst_qsqlquery.cpp

@@ -1030,6 +1030,10 @@ void tst_QSqlQuery::isActive()
     QVERIFY_SQL( q, exec( "delete from " + qtest + " where id = 42" ) );
 
     QVERIFY( q.isActive() );
+
+    QVERIFY_SQL( q, exec( "delete from " + qtest + " where id = 42" ) );
+
+    QVERIFY( q.isActive() );
 }
 
 void tst_QSqlQuery::numRowsAffected()