public function where($where, $op=null, $value=null)
    {
        $this->getQuery()->where($where, $op, $value);
        return $this;
    }
public function where($where, $op=null, $value=null)
    {
        $this->getQuery()->where($where, $op, $value);
        return $this;
    }
public function where ( $ where , $ op = null , $ value = null ) { $ this -> getQuery ( ) -> where ( $ where , $ op , $ value ) ; return $ this ; }
set where of query
@param  mixed  $where string|array
@param  mixed  $op if not set $value then op is value
@param  mixed  $value
@return static
set where of query