请加一个zend framework的有关问题

请加一个zend framework的问题
我在用phpunit测试zend项目里的model, 
这个model是这样的:

PHP code

class Application_Model_AdminGroupMapper {

    // TODO impreve inserts here (more portable between another db engines)

    static function assignMembersToGroup(
        Application_Model_AdminGroup &$group, array &$member_ids)
    {
        $inserts = array();
        foreach($member_ids as $id) {
            $inserts[] = '('.$group->id.','.mysql_real_escape_string($id).')';
        }

        $db = Zend_Registry::get('db');
        $res = $db->query(
            'INSERT IGNORE INTO admin_group_has_member(admin_group_id, member_id) VALUES '.
            implode(',', $inserts));
        return $res->rowCount();
    }

PHP code

class Application_Model_AdminGroupMapper {

    // TODO impreve inserts here (more portable between another db engines)

    static function assignMembersToGroup(
        Application_Model_AdminGroup &$group, array &$member_ids)
    {
        $inserts = array();
        foreach($member_ids as $id) {
            $inserts[] = '('.$group->id.','.mysql_real_escape_string($id).')';
        }

        $db = Zend_Registry::get('db');
        $res = $db->query(
            'INSERT IGNORE INTO admin_group_has_member(admin_group_id, member_id) VALUES '.
            implode(',', $inserts));
        return $res->rowCount();
    }