Question

这是我的桌子

|  | Id                                 |
|1 |07A83EA7-6E00-4265-906C-FF187FE18EB3|
|2 |B6C10F47-7DEE-4D2B-AA3D-FF27B8FC105C|
|3 |10F56030-0803-4133-B57B-FF3F941A0D60|

是否可以根据行号选择Id？

我尝试过：

SELECT [Id],ROW_NUMBER() OVER(Order by Id ASC) AS RowLol, Id

但这并不能真正满足我的预期，因为它会生成一个临时字段。

所需功能：

能够遍历所有条目，并将其用作循环中我的UPDATE的参数

--DECLARE @json NVARCHAR(MAX) = (SELECT Data FROM ProcessEventMessages WHERE Id='AEF11F7B-06C1-4C40-9806-0004CAC6A042')
-- This will only work for ONE instance. Hence why i need an iterative ID, to pass along here^

SELECT * FROM OPENJSON(@json) 
WITH (  
    message varchar(200) '$.message',
    machineId varchar(200) '$.machineId',
    machineName int '$.machineName',
    ipAddress varchar(200) '$.ipAddress',
    LocalTime datetime2(7) '$.time'
 )  AS ChangeTime;



--loop on id
DECLARE @loopCounter INT = 0;

WHILE @loopCounter < (SELECT count(Id) FROM ProcessEventMessages)
BEGIN
PRINT 'changing values...';

UPDATE ProcessEventMessages SET Data = JSON_MODIFY(@json,'$.time', FORMAT(DATEADD(hour,-2,JSON_VALUE(@json,'$.time')),'yyyy-MM-ddTHH:mm:ss.fff')) WHERE ROWNUMBER = @loopCounter)
SET @loopCounter = @loopCounter + 1;
END;

PRINT 'done';
GO

建议：

DECLARE @json NVARCHAR(MAX)
DECLARE @loopCounter INT = 0;
WHILE @loopCounter < (SELECT count(Id) FROM ProcessEventMessages)
BEGIN
    PRINT 'Changing...';
SELECT * FROM OPENJSON(@json) 
WITH (  
    message varchar(200) '$.message',
    machineId varchar(200) '$.machineId',
    machineName int '$.machineName',
    ipAddress varchar(200) '$.ipAddress',
    LocalTime datetime2(7) '$.time'
 )  AS ChangeTime;

   ;WITH CTE AS(
    SELECT *,ROW_NUMBER() OVER(Order by Id ASC) AS RowNo
    FROM ProcessEventMessages 
    )
    UPDATE CTE 

    SET Data = JSON_MODIFY(@json,'$.time', FORMAT(DATEADD(hour,-2,JSON_VALUE(@json,'$.time')),'yyyy-MM-ddTHH:mm:ss.fff')) 
    WHERE RowNo = @loopCounter

   SET @loopCounter = @loopCounter + 1;
END;

PRINT 'Done';
GO

尝试崩溃：

DECLARE @loopCounter INT = 0;

WHILE @loopCounter < (SELECT count(Id) FROM ProcessEventMessages)
BEGIN
    PRINT 'Changing...';
    DECLARE @json NVARCHAR(MAX) = (SELECT Data FROM ProcessEventMessages WHERE RowNo = @loopCounter) -- RowNo isn't declared here. Where would i move it?
    SELECT * FROM OPENJSON(@json) 
    WITH (  
        message varchar(200) '$.message',
        machineId varchar(200) '$.machineId',
        machineName int '$.machineName',
        ipAddress varchar(200) '$.ipAddress',
        LocalTime datetime2(7) '$.time'
     )  AS ChangeTime;

   ;WITH CTE AS(
    SELECT *,ROW_NUMBER() OVER(Order by Id ASC) AS RowNo
    FROM ProcessEventMessages 
    )
    UPDATE CTE 

    SET Data = JSON_MODIFY(@json,'$.time', FORMAT(DATEADD(hour,-2,JSON_VALUE(@json,'$.time')),'yyyy-MM-ddTHH:mm:ss.fff')) 
    WHERE RowNo = @loopCounter
    SET @loopCounter = @loopCounter + 1;
END;

PRINT 'Done';
GO

示例：

DECLARE @RowNrr int = (SELECT *,ROW_NUMBER() OVER(Order by Id ASC) AS RowNrr FROM ProcessEventMessages)
SET @json = (SELECT Data FROM ProcessEventMessages WHERE @RowNrr = @loopCounter)
...
and then
...

;WITH CTE AS(
    SELECT @RowNrr
)

but it doesn't work :/

Answer 1

假设您将sql server用作dbms，现在，如果我正确理解了您的要求，那么您可能会寻找 CTE ，

;WITH CTE AS(
   SELECT [Id],
          ROW_NUMBER() OVER(Order by Id ASC) AS RowNo
   FROM TableName
)
SELECT ID
FROM CTE
WHERE RowNo IN(1,2,3)

已更新

如果您尝试将更新命令与cte表单集成在一起，则可能看起来像这样。

;WITH CTE AS(
    SELECT *,ROW_NUMBER() OVER(Order by Id ASC) AS RowNo
    FROM ProcessEventMessages 
)
UPDATE CTE 
SET Data = JSON_MODIFY(@json,'$.time', FORMAT(DATEADD(hour,-2,JSON_VALUE(@json,'$.time')),'yyyy-MM-ddTHH:mm:ss.fff')) 
WHERE RowNo = @loopCounter

注意：我不确定ID上的行号是否一致。因为如果插入新ID，则行号可能会发生变化。

Answer 2

((?<![\\])['"])((?:.(?!(?<![\\])\1))*.?)\1

根据行号选择ID

2 个答案: