是否有“如果存在"的提示?测试链接服务器? [英] Is there an "IF EXISTS" test for a linked server?

问题描述

我希望能够以编程方式(在T-SQL中)检查当前服务器和数据库是否已存在特定的链接服务器(这样，如果该链接尚不存在，则可以创建它).我尝试过这样的事情:

I want to be able to programmatically (in T-SQL) check if a specific linked server already exists for my current server and database (so that if the link doesn't exist yet, I can create it). I tried stuff like this:

IF OBJECT_ID('myserver\devdb_1') IS NULL
BEGIN
  PRINT 'Does not exist, need to create link'
  EXEC master.dbo.sp_addlinkedserver @server = N'myserver\devdb_1', 
                                     @srvproduct=N'SQL Server'
END
ELSE
  PRINT 'Link already exists'

但是，即使链接已经存在，OBJECT_ID测试也始终返回null.有什么方法可以在T-SQL中进行检查，以便我的其余代码可以假定链接始终存在?

But the OBJECT_ID test always returns null, even if the link already exists. Any way to do this check in T-SQL, so that the rest of my code can assume the link always exists?

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