Question

基本上我想做类似

的事情

SELECT * FROM FriendRequests WHERE (from == user OR to == user) AND status = "accepted"

有一种名为orQueryWithSubqueries的方法可以让我将这两种方法结合起来，但我无法弄清楚如何在这些方法和状态查询之间执行AND。

let statusCheck = FriendRequest.query()
statusCheck.whereKey("status", equalTo: FriendRequest.Status.Accepted.rawValue)

let userCheckOne = FriendRequest.query()
userCheckOne.whereKey("from", equalTo: User.currentUser())

let userCheckTwo = FriendRequest.query()
userCheckOne.whereKey("to", equalTo: User.currentUser())

let userCheck = PFQuery.orQueryWithSubqueries([userCheckOne, userCheckTwo])

// Some how do (userCheck AND statusCheck)

Answer 1

如果您从SQL角度来看它，请将OR查询更像UNION语句。

您的查询将如下所示：

SELECT *
FROM FriendRequests
WHERE from = user
AND status = "accepted"

UNION

SELECT *
FROM FriendRequests
WHERE to = user
AND status = "accepted"

正如您所看到的，解决方案是简单地将AND部分添加到您的两个查询中：

let userCheckOne = FriendRequest.query()
userCheckOne.whereKey("from", equalTo: User.currentUser())
userCheckOne.whereKey("status", equalTo: FriendRequest.Status.Accepted.rawValue)

let userCheckTwo = FriendRequest.query()
userCheckTwo.whereKey("to", equalTo: User.currentUser())
userCheckTwo.whereKey("status", equalTo: FriendRequest.Status.Accepted.rawValue)

let userCheck = PFQuery.orQueryWithSubqueries([userCheckOne, userCheckTwo])

解析 - 使用OR和AND进行复合查询？

1 个答案: