/**
  * call parent constructor
  *
  * @param mixed   $dsn        DSN string, DSN array or MDB object
  * @param array   $options    db options
  * @param integer $MDBversion MDB version (1=MDB, 2=MDB2)
  */
 function MDB_QueryTool($dsn = false, $options = array(), $MDBversion = 1)
 {
     parent::__construct($dsn, $options, $MDBversion);
 }
 /**
  * call parent constructor
  * @param mixed $dsn DSN string, DSN array or MDB object
  * @param array $options
  */
 function MDB_QueryTool($dsn = false, $options = array())
 {
     parent::__construct($dsn, $options);
 }