使用设置查询MySQL - Kohana 3.0

Question

即时通讯使用Kohana 3.0和MySQL
如何使用DB ::查询（Database :: SELECT，'您的查询'）;当使用这样的查询：

$query = DB::query(Database::SELECT, 
"SET @id_draw=0; 
SELECT * 
FROM 
(
    SELECT a.sender,a.recipient,@id_draw:=@id_draw+1 AS id_draw 
      FROM `gifts` a 
      WHERE a.sender = 1499089137 
      AND a.sender = (
       SELECT DISTINCT b.recipient 
       FROM `gifts` b 
       WHERE b.sender = a.recipient 
       AND b.recipient = 1499089137 
      ) 
    GROUP BY a.sender,a.recipient 
)x 
WHERE x.id_draw = RAND()"); 

使用时，我的问题是得到错误：

• SET @ id_draw = 0;
• @id_draw：= @ id_draw + 1个AS id_draw

Answer 1

实施例的要求：

SELECT something 
     , another_thing 
     , @prev := @curr 
     , @curr := amount 
     , @rank := CASE WHEN @prev = @curr THEN @rank ELSE @rank+1 END rank 
    FROM somewhere 
     , (SELECT @curr := null, @prev := null, @rank := 0) defs 
    ORDER 
    BY another_thing DESC;