sp_MSforeachdb:只包括来自有结果的数据库的结果 [英] sp_MSforeachdb: only include results from databases with results
问题描述
我正在使用一个简单的命令运行以下存储过程 sp_MSforeachdb
.我的问题是如何将结果限制为仅显示至少有 1 条记录满足命令的数据库:
I'm running the below stored procedure sp_MSforeachdb
with a simple command. My question is how to limit the result to show only the databases that have at least 1 record satisfying the command:
这是我的存储过程:
EXECUTE master.sys.sp_MSforeachdb 'USE [?];
IF (EXISTS (SELECT *
FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_NAME = ''Tabs''))
BEGIN
SELECT ''?'' as dbname,T.TabName, T.TabPath
FROM Tabs T
WHERE T.TabID IN (
SELECT Distinct TM.TabID
FROM TabModules TM
WHERE mID IN (
...
)
)
ORDER BY T.TabName
END
'
有什么想法可以修改 sp 以使其不显示具有空结果的数据库(见图)?
Any ideas how I can modify the sp so that it doesn't display the databases that have empty results (see image)?
推荐答案
好吧,首先,停止使用 sp_MSforEachDb
.哦,问题(如果你想要证据,请参阅 此处).
Well, first, stop using sp_MSforEachDb
. Oh, the problems (if you want proof, see here).
怎么样:
DECLARE @cmd NVARCHAR(MAX) = N'', @sql NVARCHAR(MAX) = N'';
SELECT @cmd += N'IF EXISTS (SELECT 1 FROM '
+ QUOTENAME(name) + '.sys.tables WHERE name = N''Tabs'')
SET @sql += N''UNION ALL
SELECT ''''' + name + ''''',T.TabName
FROM ' + QUOTENAME(name) + '.dbo.Tabs AS T
WHERE EXISTS
(
SELECT 1 FROM ' + QUOTENAME(name) + '.dbo.TabModules AS TM
WHERE TM.TabID = T.TabID
AND TM.mID IN -- this should probably be exists too
(
...
)
)
'''
FROM sys.databases
WHERE state = 0 -- assume you only want online databases
AND database_id > 4; -- assume you don't want system dbs
EXEC sp_executesql @cmd, N'@sql NVARCHAR(MAX) OUTPUT', @sql OUTPUT;
SET @sql = STUFF(@sql, 1, 10, '') + N' ORDER BY TabName;';
PRINT @sql; -- this will appear truncated, but trust me, it is not truncated
-- EXEC sp_executesql @sql;
如果你真的想要一些未知的、任意数量的独立结果集,改变很简单.
If you really want some unknown, arbitrary number of separate resultsets, the change is simple.
DECLARE @cmd NVARCHAR(MAX) = N'', @sql NVARCHAR(MAX) = N'';
SELECT @cmd += N'IF EXISTS (SELECT 1 FROM '
+ QUOTENAME(name) + '.sys.tables WHERE name = N''Tabs'')
SET @sql += N''SELECT ''''' + name + ''''',T.TabName
FROM ' + QUOTENAME(name) + '.dbo.Tabs AS T
WHERE EXISTS
(
SELECT 1 FROM ' + QUOTENAME(name) + '.dbo.TabModules AS TM
WHERE TM.TabID = T.TabID
AND TM.mID IN -- this should probably be exists too
(
...
)
)
ORDER BY T.TabName;
'';'
FROM sys.databases
WHERE state = 0 -- assume you only want online databases
--AND database_id > 4; -- assume you don't want system dbs
EXEC sp_executesql @cmd, N'@sql NVARCHAR(MAX) OUTPUT', @sql OUTPUT;
PRINT @sql; -- this will appear truncated, but trust me, it is not truncated
-- EXEC sp_executesql @sql;
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