Control flow in T-SQL SP using IF..ELSE IF - are there other ways?

Question

I need to branch my T-SQL stored procedure (MS SQL 2008) control flow to a number of directions:

CREATE PROCEDURE [fooBar]
   @inputParam INT
AS
BEGIN
  IF @inputParam = 1
  BEGIN
    ...
  END
  ELSE IF @inputParam = 3
  BEGIN
    ...
  END
  ELSE IF @inputParam = 3
  BEGIN
    ...
  END
END

Is there any other ways? For example, in C# I shoud use switch-case block.

Answer 1

CASE expression
      WHEN value1 THEN result1
      WHEN value2 THEN result2
      ...
      WHEN valueN THEN resultN

      [
        ELSE elseResult
      ]
END

http://www.4guysfromrolla.com/webtech/102704-1.shtml For more information.

Answer 2

IF...ELSE...ENDIF is pretty much what we've got in T-SQL. There is nothing like structured programming's CASE statement. If you have an extended set of ...ELSE IF...s to deal with, be sure to include BEGIN...END for each block to keep things clear, and always remember, consistant indentation is your friend!

Answer 3

Nope IF is the way to go, what is the problem you have with using it?

BTW your example won't ever get to the third block of code as it and the second block are exactly alike.

Answer 4

No, but you should be careful when using IF...ELSE...END IF in stored procs. If your code blocks are radically different, you may suffer from poor performance because the procedure plan will need to be re-cached each time. If it's a high-performance system, you may want to compile separate stored procs for each code block, and have your application decide which proc to call at the appropriate time.

Answer 5

That's about the limit for control structures in T-SQL, along with GOTO and WHILE.