Question

我想知道是否有人可以告诉我如何使用L4的查询构建器编写以下查询。

SELECT u.user_id,c.c_id,u.username,u.email
 FROM conversation c, users u
 WHERE CASE 
 WHEN c.user_one = '$user_one'
 THEN c.user_two = u.user_id
 WHEN u.user_two = '$user_one'
 THEN c.user_one= u.user_id
 END 
 AND (
 c.user_one ='$user_one'
 OR c.user_two ='$user_one'
 )
 Order by c.c_id DESC

我似乎无法在L4 doc中找到关于CASE的任何内容

干杯，

Answer 1

Laravel 4使用Query Builder不支持此功能。但是，您可以使用常规select函数

$params = array($user_one, $user_one, $user_one, $user_one);
$results = DB::select(
    "SELECT u.user_id, c.c_id, u.username, u.email
    FROM conversation c, users u
    WHERE 
        CASE 
            WHEN c.user_one = ?
            THEN c.user_two = u.user_id
            WHEN u.user_two = ?
            THEN c.user_one = u.user_id
        END 
        AND (
            c.user_one = ?
            OR c.user_two = ?
        )
    ORDER BY c.c_id DESC",
    $params
);

您可以在Laravels database documentation上阅读有关此内容的更多信息。

Laravel 4 - 使用案例编写查询

1 个答案: