T-SQL：在大小写块中执行命令

Question

Is there any possible way to execute something like this in T-SQL?

CASE @@VERSION 
WHEN 'SQL Server 2005'
THEN Command_A
ELSE Command_B
END

This case block should pick Command_A if the server version is 2005. If not Command_B should get executed.

Answer 1

Actually the case is a "subcommand" of SELECT you could achieve what you want with something like this:

declare @s varchar(255)
select @s = case @@VERSION 
when 'SQL Server 2005'
THEN 'command 1'
ELSE 'command 2'
END
exec (@s)

Answer 2

That should work just fine, like this:

if (@@version like '%SQL Server 2014%') select '2014'
else select 'Other'

See SQL Fiddle .

But if you're going to have there code that is not supported by the version you're running it in, you should either create separate procedures that you're going to call, or use dynamic SQL.

Answer 3

You can use dynamic SQL for that

DECLARE @dynamicSql VARCHAR(max);
CASE @@VERSION
            WHEN 'SQL Server 2005'
                THEN @dynamicSql = 'Command_A'
            ELSE @dynamicSql = 'Command_B'
            END

    EXEC (@dynamicSql)

Answer 4

You can use this CASE to get the sql-server version:

SELECT CASE SUBSTRING(CAST(SERVERPROPERTY('productversion')AS nvarchar(128)), 1, CHARINDEX('.', CAST(SERVERPROPERTY('productversion')AS nvarchar(128))) - 1)
       WHEN 7 THEN 'SQL Server 7'
       WHEN 8 THEN 'SQL Server 2000'
       WHEN 9 THEN 'SQL Server 2005'
       WHEN 10 THEN 'SQL Server 2008/2008 R2'
       WHEN 11 THEN 'SQL Server 2012'
       WHEN 12 THEN 'SQL Server 2014'  
       ELSE 'Unsupported' END AS DB_Version

Then you just need to execute dynamic sql according to the result.

Demo