SQL Server 2016 过滤器里面 json_value

Question

我有一个feedstable有一个json数组列（UserLike）的人喜欢它。 Table 会像：

FeedID  FeedName    UserLike
 1       Feed 1      [{"UserID":1,"UserName":"User 1"},{"UserID":2,"UserName":"User 2"},...]
 2       Feed 2      [{"UserID":1,"UserName":"User 1"},{"UserID":2,"UserName":"User 2"},...]
 3       Feed 3      [{"UserID":1,"UserName":"User 1"}]

我想通过比较UserID（如果他喜欢，或者不喜欢return UserLike null，我想获得提要行，即使登录用户不在 UserLike 列表中）。

我该怎么做？ T-SQL 是否支持以下内容：

select 
    FeedID, FeedName, 
    Json_value(UserLike, '$[UserID=1].UserName')...

我期待的结果是：

FeedID  FeedName    UserID  UserName
1       Feed 1      2       User 2
2       Feed 2      2       User 2
3       Feed 3      NULL    NULL

使用 WHERE 子句：UserID=2

Answer 1

--Here we take all feeds
;WITH cte AS (
SELECT DISTINCT FeedID,
                FeedName
FROM dbo.feeds
--Here we take parsed JSON
), feeds AS (
SELECT  FeedID,
        FeedName,
        UserID,
        UserName
FROM [dbo].[feeds] f
CROSS APPLY OPENJSON ([UserLike]) 
WITH (
    UserID int,
    UserName nvarchar(255)
))
--And here we join them
SELECT c.FeedID,
        c.FeedName,
        f.UserID,
        f.UserName
FROM cte c
LEFT JOIN feeds f
    ON f.FeedID = c.FeedID and f.UserID = 2

输出：

FeedID  FeedName    UserID  UserName
1       Feed 1      2       User 2
2       Feed 2      2       User 2
3       Feed 3      NULL    NULL

SQL Server 2016 过滤器里面 json_value

SQL Server 2016 filter inside json_value

sql-server

sql-server-2016