/**
  * Executes a series of SQL orders, optionally as a transaction
  *
  * @param  boolean $abort_on_error      Aborts on error (true by default)
  * @param  boolean $p_transaction_safe  Encloses all in a single transaction (false by default)
  * @return boolean true: success, false: error(s)
  */
 function query_batch($abort_on_error = true, $p_transaction_safe = false)
 {
     return $this->_db->query_batch($abort_on_error, $p_transaction_safe);
 }