[英]How to LOOP a query that is created dynamically in SQL Server
I have a stored procedure where I am getting the database name from a table and then trying to create a dynamic query from this database name and fetching the results.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。 Once the results are fetched I need to loop these results for further queries to be executed to get the desired result
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
As the SQL query is dynamic - how do I loop the output of this dynamic query.由于 SQL 查询是动态的 - 我如何循环此动态查询的 output。
As the SQL query is dynamic How do I loop the output of this dynamic query.
由于 SQL 查询是动态的,如何循环此动态查询的 output。
Create a temp table outside of the dynamic query, and insert into it in the dynamic query.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。 Then you can read from the temp table.
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;';
But a better overall approach might be to create a partitioned view in a seperate database over all the tables.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。 EG
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
And have a procedure that alters it any time a new client db is added.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。
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