question: protected void applySetTimestamp ( Long timestamp ) throws SQLException { if ( timestamp != null && conn . supportsControlTimestamp ( ) ) { if ( timestamp . longValue ( ) != currentTimestamp ) { currentTimestamp = timestamp . longValue ( ) ; statement . addBatch ( conn . getControlTimestampQuery ( timestamp ) ) ; } } }
target:  applySetTimestamp adds to the batch the query used to change the server timestamp, if needed and if possible (if the database support such a feature)