function _close()
 {
     return @fbsql_close($this->_connectionID);
 }

 /**
  * Disconnects from the database server
  *
  * @return bool  TRUE on success, FALSE on failure
  */
 function disconnect()
 {
     $ret = @fbsql_close($this->connection);
     $this->connection = null;
     return $ret;
 }

 /**
  * all the RDBMS specific things needed close a DB connection
  *
  * @return boolean
  * @access private
  **/
 function _close()
 {
     if ($this->connection != 0) {
         if (isset($this->supported['Transactions']) && !$this->auto_commit) {
             $result = $this->autoCommit(TRUE);
         }
         @fbsql_close($this->connection);
         $this->connection = 0;
         $this->affected_rows = -1;
         if (isset($result) && MDB::isError($result)) {
             return $result;
         }
         unset($GLOBALS['_MDB_databases'][$this->database]);
         return TRUE;
     }
     return FALSE;
 }

 public function close()
 {
     if (!empty($this->connect)) {
         @fbsql_close($this->connect);
     } else {
         return false;
     }
 }

 /**
  * execute a query as DBA
  *
  * @param string $query the SQL query
  * @param mixed   $types  array that contains the types of the columns in
  *                        the result set
  * @param boolean $is_manip  if the query is a manipulation query
  * @return mixed MDB2_OK on success, a MDB2 error on failure
  * @access public
  */
 function &standaloneQuery($query, $types = null, $is_manip = false)
 {
     $user = $this->options['DBA_username'] ? $this->options['DBA_username'] : $this->dsn['username'];
     $pass = $this->options['DBA_password'] ? $this->options['DBA_password'] : $this->dsn['password'];
     $connection = $this->_doConnect($user, $pass, $this->options['persistent']);
     if (MDB2::isError($connection)) {
         return $connection;
     }
     $offset = $this->offset;
     $limit = $this->limit;
     $this->offset = $this->limit = 0;
     $query = $this->_modifyQuery($query, $is_manip, $limit, $offset);
     $result =& $this->_doQuery($query, $is_manip, $connection, $this->database_name);
     if (!MDB2::isError($result)) {
         $result = $this->_affectedRows($connection, $result);
     }
     @fbsql_close($connection);
     return $result;
 }

 /**
  * Log out and disconnect from the database.
  *
  * @param  boolean $force if the disconnect should be forced even if the
  *                        connection is opened persistently
  * @return mixed true on success, false if not connected and error
  *                object on error
  * @access public
  */
 function disconnect($force = true)
 {
     if (is_resource($this->connection)) {
         if ($this->in_transaction) {
             $this->rollback();
         }
         if (!$this->opened_persistent || $force) {
             @fbsql_close($this->connection);
         }
     }
     return parent::disconnect($force);
     return MDB2_OK;
 }