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我有一个存储过程,我从表中获取数据库名称,然后尝试从该数据库名称创建动态查询并获取结果。获取结果后,我需要循环这些结果以执行进一步的查询以获得所需的结果

USE DATABASE1
GO

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO

ALTER PROCEDURE [User].[update_client_details] 
AS
    DECLARE @clientdata CURSOR,
            @clientid INT,
            @SQL NVARCHAR(2000),
            @uid INT,
            @isFirst INT,
            @isTemp INT,
            @inactive INT,
            @createdDate Date

BEGIN
    DECLARE C CURSOR LOCAL FOR 
        SELECT clientuserid FROM USER.queen_client

    OPEN C
    FETCH NEXT FROM C INTO @clientid

    WHILE @@FETCH_STATUS = 0
    BEGIN
        SET @SQL = N'SELECT userid, @isFirst=isfirst, @isTemp=istemp, @inactive=inactive, @createdDate=createddate FROM ' +QUOTENAME(@clientid)+'.USER.queen_user;';

        EXEC sys.sp_executesql @SQL, N'@inactive int OUTPUT, @uid int OUTPUT, @isFirst int OUTPUT, @isTemp int OUTPUT, @createdDate date OUTPUT', @inactive OUTPUT, @uid OUTPUT, @isFirst OUTPUT, @isTemp OUTPUT, @createdDate OUTPUT;

        // @SQL returns multiple rows - I need to loop the output of @SQL 
        // UPDATE QUERY BASED ON IF CONDITION COMES HERE

        FETCH NEXT FROM C INTO @clientid
    END

    CLOSE C
    DEALLOCATE C
END

由于 SQL 查询是动态的 - 我如何循环这个动态查询的输出。

4

1 回答 1

0

由于 SQL 查询是动态的,我如何循环这个动态查询的输出。

在动态查询之外创建一个临时表,并在动态查询中插入其中。然后你可以从临时表中读取。

    SET @SQL = N'
INSERT INTO #tempUser(userId,IsFirst,IsTemp,inactive,createddate)
SELECT userid, isfirst, istemp, inactive, createddate 
FROM ' +QUOTENAME(@clientid)+'.USER.queen_user;';

但更好的整体方法可能是在一个单独的数据库中为所有表创建一个分区视图。例如

create view queen_user
as
select 123 clientId, userid, isfirst, istemp, inactive
from Client123.USER.queen_user
union all
select 124 clientId, userid, isfirst, istemp, inactive
from Client124.USER.queen_user
union all
. . .
union all
select 999 clientId, userid, isfirst, istemp, inactive
from Client999.USER.queen_user

并且有一个程序可以在添加新的客户端数据库时随时更改它。

于 2020-06-09T14:07:33.927 回答