如何在SQL Server 2005中使用动态SQL更改登录名

Question

I have a script that works fine in SQL Server 2008R2 but it couldn't work in SQL Server 2005. Is there any way that can work for both version?

declare @SQL nvarchar(max)  = ''

select @SQL = @SQL + 'ALTER LOGIN ' + QUOTENAME(DisabledName) + ' DISABLE;'
from [SysAdmin].[dbo].[DisabledAccountHistory]
where DisabledName in (select name 
                       from sys.server_principals 
                       where is_disabled = 0)
group by DisabledName

exec sp_executesql @SQL

The error I get is:

Msg 139, Level 15, State 1, Line 0 Cannot assign a default value to a local variable. Msg 137, Level 15, State 2, Line 3 Must declare the scalar variable "@SQL". Msg 156, Level 15, State 1, Line 6 Incorrect syntax near the keyword 'group'. Msg 137, Level 15, State 2, Line 8 Must declare the scalar variable "@SQL".

Answer 1

The declaration including an assignment of an initial value on a single line is a new feature in SQL Server 2008 - you cannot do this in 2005.

Change your line to:

declare @SQL nvarchar(max) 
set @SQL  = N''