在Yii中將SQL Server查詢轉換爲MySQL

Question

如何在Yii中使用MySQL編寫此查詢？

Yii::app()->db->createCommand() 
     ->select("C.[id], C.[name], C.[family], C.[mobile] 
     , Stuff((
       SELECT ', ' + (contact_group.name) 
     FROM contact_grouping AS CGG , contact_group 
     WHERE CGG.contact = C.Id AND CGG.[group] = contact_group.id 

     FOR XML PATH(''), TYPE 
     ).value('.', 'NVARCHAR(MAX)'), 1, 2, '') AS [groups]") 
     ->from("contact AS c") 
     ->where("C.[user] = {$UID} AND C.[attr] = ".self::ATTR_NORMAL.$con) 

Answer 1

您正在尋找GROUP_CONCAT。您的查詢可能看起來像

Yii::app()->db->createCommand() 
     ->select("c.id, c.name, c.family, c.mobile, 
       (SELECT GROUP_CONCAT(g.name) 
        FROM contact_grouping gg JOIN contact_group g 
         ON g.id = gg.`group` 
        WHERE gg.contact = c.id 
        GROUP BY gg.contact) groups") 
     ->from("contact c") 
     ->where("c.user = {$UID} AND c.attr = ".self::ATTR_NORMAL.$con) 

未測試