Question

我有这样的查询：

    $query = "Select EXISTS(SELECT * FROM grp_user AS pivot JOIN groups
AS g ON pivot.grp_id = g.id JOIN vote ON g.id = vote.grp_id WHERE 
pivot.grp_id = :grp_id AND pivot.user_id = :user_id)";

我想运行它。所以我试过了：

$res = DB::select($query,array("grp_id"=>250,"user_id"=>1));

res理想情况下应该有一个布尔值，但它有一个类似的数组：

[{"EXISTS(SELECT * FROM grp_user AS pivot JOIN groups AS g ON pivot.grp_id = g.id JOIN vote ON g.id = vote.grp_id WHERE pivot.grp_id = ? AND pivot.user_id = ?)":1}]

注意最后的1，即我感兴趣的值（它的1或0）。

我怎样才能做到这一点，或者以“laravel”的方式实现这个目标？

Answer 1

为什么不检查它是否为空：

$query = "Select * FROM grp_user AS pivot JOIN groups
AS g ON pivot.grp_id = g.id JOIN vote ON g.id = vote.grp_id WHERE 
pivot.grp_id = :grp_id AND pivot.user_id = :user_id LIMIT 1";

$res = DB::select($query,array("grp_id"=>250,"user_id"=>1));

return (count($res) > 0) ? 1 : 0;

Laravel运行Select Exists查询

1 个答案: