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();    }