add commit

Author: todd5167

rdb/rdb-sink/src/main/java/com/dtstack/flink/sql/sink/rdb/format/RetractJDBCOutputFormat.java

@@ -198,6 +198,7 @@ private void writeSingleRecord(Row row) {
         try {
             updatePreparedStmt(row, upload);
             upload.execute();
+            dbConn.commit();
         } catch (SQLException e) {
             outDirtyRecords.inc();
             LOG.error("record insert failed ..", row.toString());