如何修改json subArray sql server中的特定对象

Posted 2023-05-08

【中文标题】如何修改json subArray sql server中的特定对象

【英文标题】：How Modify specific object in json subArray sql server

【发布时间】：2020-06-17 16:00:46

【问题描述】：

我在sql db中有json字符串

   "MainItem":
      "UserId":4,
      "UserName":"name",
      "CityDetails":
         "CityId":1,
         "CityName":"egypt"
      ,
      "ListSubItems":[
         
            "UserId":2,
            "UserName":"name2",
            "FullDescription":"",
            "ShortDescription":"wish",
            "CityDetails":
               "CityId":2,
               "CityName":"us"
            
         ,
         
            "UserId":3,
            "UserName":"name3",
            "FullDescription":"",
            "ShortDescription":"wish",
            "CityDetails":
               "CityId":44,
               "CityName":"sau"
            
         
      ]
   

你可以解析https://jsonparseronline.com/来查看json

我需要更新$.MainItem.ListSubItems where UserId=3 set UserName ='new name'

我需要更新所有用户 ID = 3

作为

update MyTable 
  set jsonCol= json_modify(jsonCol, $.MainItem.ListSubItems .where userId=3 , userName='new name ')

【参考方案1】：

如果我按照您正在尝试做的事情，这应该工作。我不知道您的表中有多少记录，因此可能需要进行一些调整/调整。

DECLARE @MyTable TABLE
(
    ID INT IDENTITY (1,1) NOT NULL
    ,JsonCol NVARCHAR(MAX)
)

INSERT INTO @MyTable
(
    JsonCol
)
VALUES
(N'
   "MainItem":
      "UserId":4,
      "UserName":"name",
      "CityDetails":
         "CityId":1,
         "CityName":"egypt"
      ,
      "ListSubItems":[
         
            "UserId":2,
            "UserName":"name2",
            "FullDescription":"",
            "ShortDescription":"wish",
            "CityDetails":
               "CityId":2,
               "CityName":"us"
            
         ,
         
            "UserId":3,
            "UserName":"name3",
            "FullDescription":"",
            "ShortDescription":"wish",
            "CityDetails":
               "CityId":44,
               "CityName":"sau"
            
         
      ]
   
'
)


UPDATE @MyTable
Set JsonCol = 
    JSON_MODIFY
        (jsonCol
        ,'$.MainItem.ListSubItems'
        ,(select 
        orig.UserId
        ,COALESCE(NewVals.UserName, orig.UserName) as UserName
        ,orig.FullDescription
        ,orig.ShortDescription
        ,orig.CityDetails
    from OPENJSON(jsonCol, '$.MainItem.ListSubItems') 
    WITH (
        UserId INT 
        ,UserName NVARCHAR(100)
        ,FullDescription NVARCHAR(1000)
        ,ShortDescription NVARCHAR(250)
        ,CityDetails NVARCHAR(MAX) as json
    ) as orig
    left join 
        (
            SELECT 3 as UserID, 'new name' as UserName
        ) as NewVals ON orig.UserId = NewVals.UserID
    FOR JSON AUTO)
    )

SELECT * FROM @MyTable