public function getErrorString()
    {
        $this->execute();
        
        return $this->error ? $this->error['errcode'] . ':' . $this->error['errmsg'] : null;
    }
public function getErrorString()
    {
        $this->execute();
        
        return $this->error ? $this->error['errcode'] . ':' . $this->error['errmsg'] : null;
    }
public function getErrorString ( ) { $ this -> execute ( ) ; return $ this -> error ? $ this -> error [ 'errcode' ] . ':' . $ this -> error [ 'errmsg' ] : null ; }
get error string
@return string|NULL
get error string