public function getFirst(){
        $res = ExecImpl::get($this->context);
        if(count($res)){
            return $res[0];
        }
        return null;
    }
public function getFirst(){
        $res = ExecImpl::get($this->context);
        if(count($res)){
            return $res[0];
        }
        return null;
    }
public function getFirst ( ) { $ res = ExecImpl :: get ( $ this -> context ) ; if ( count ( $ res ) ) { return $ res [ 0 ] ; } return null ; }
Execute sql and get one response
@return null
Execute sql and get one response