public function whereIn($where, $value)
    {
        if( !is_array($value) ) {
            $value = (array) $value;
        }
        if( count($value) <= 0 ) {
            $this->where[] = array(new Expression('FALSE'));
        } else {
            $this->where[] = array($where, $value, 'IN');
        }
        return $this;
    }