Question

我有一个feeds表，其中包含喜欢它的json数组列（UserLike）。表格如下：

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"}]

我希望通过比较UserID获取供稿列表并完全类似于用户登录信息（如果他喜欢，或者不返回UserLike null，即使登录用户不在{，我也希望获得供稿行{1}}列表）。

我该怎么办？ T-SQL是否支持以下内容：

UserLike

我期待的结果是：

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

带有WHERE子句的

：UserID = 2

Answer 1

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输出：

--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

SQL Server 2016过滤器内部json_value

1 个答案: