sp_MSforeachdb 查询帮助

2021-09-10 00:00:00 tsql sql-server sp-msforeachdb

我正在使用许多相同的数据库，因此我使用 sp_MSforeachdb 过程以便我可以从表中检索信息.

I'm working with a lot of databases that are the same so I am using the sp_MSforeachdb procedure so that I can retrieve information from a table.

我遇到的问题是盒子上还有其他数据库没有表，所以我抛出了无效对象错误.

The problem I have encountered is that there are other databases on the box that don't have the table, so I'm throwing invalid object errors.

这是我目前所拥有的，我正在过滤 LoginDatabase，因为它具有相同的表，但我不希望在查询中使用它.

Here is What I have at the moment, I'm filtering LoginDatabase because it has the same table but I don't want that in the query.

我的问题是，我如何才能将其限制为包含我想从中获取信息的表的数据库.

My question is, how can I restrict it just to the databases with the table I want to get information back from. 

SET NOCOUNT ON

CREATE TABLE #tmpData
(
    DbName VARCHAR(30),
    DbVersion FLOAT
)

exec sp_msforeachdb @command1='
    USE ?;

    INSERT INTO #tmpData
    SELECT ''?'', (SELECT Setting 
        FROM ?.dbo.gl_SysParams 
        WHERE Keyword = ''DatabaseSchema'')
    FROM sysobjects o
    WHERE type=''U'' 
    AND [name] = ''gl_SysParams'' 
    AND ''?'' <> ''LoginDatabase'' ORDER BY [name]
    '   

SET NOCOUNT OFF

SELECT DbName, DbVersion FROM #tmpData ORDER BY DbName

DROP TABLE #tmpData

推荐答案

您可以在每个数据库中使用对 sp_MSforeachtable 的调用，您可以在其中使用 @WhereAnd 参数过滤到您感兴趣的表 - 它赢了'不存在于您不感兴趣的数据库中，因此 sp_MSforeachtable 将在其中运行 0 次，并在每个带有该表的数据库中运行 1 次.

You could use a call to sp_MSforeachtable within each database, where you use the @WhereAnd parameter to filter down to just the table you're interested in - it won't exist in the database you're not interested in, so sp_MSforeachtable will run 0 times in there, and 1 time in each database with the table.

编辑简单的例子只是在我的一个随机服务器上运行，我知道只有一个数据库有一个 tblClient 表，有一个 ClientID 列(请原谅命名):

Edit Simple example just run against a random server of mine, where I knew only one database had a tblClient table, with a ClientID column (forgive the naming):

create table #t (
    ID int not null
)
exec sp_MSforeachdb 'use ? exec sp_MSforeachtable ''insert into #t(ID) select ClientID from ~'',''~'',@whereand=''and o.name=''''tblClient''''''','?'
select * from #t
drop table #t

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