Granada\ORM::_build_insert_update PHP Method

    protected function _build_insert_update()
    {
        $query = array();
        $query[] = "INSERT INTO";
        $query[] = $this->_quote_identifier($this->_table_name);
        $field_list = array_map(array($this, '_quote_identifier'), array_keys($this->_dirty_fields));
        $query[] = "(" . implode(", ", $field_list) . ")";
        $query[] = "VALUES";
        $placeholders = $this->_create_placeholders($this->_dirty_fields);
        $query[] = "({$placeholders})";
        $query[] = " ON DUPLICATE KEY UPDATE ";
        $query[] = implode(" = ?, ", $field_list) . " = ? ";
        return implode(" ", $query);
    }