Creating a stored procedure if it does not already exist

Question

I want to check if a list of stored procedures exist. I want this all to be done in 1 script, one by one. So far I have this format:

USE [myDatabase]
GO

IF NO         


        

Answer 1

I like to use ALTER so I don't lose permissions and if you have a syntax error the old version still exists:

BEGIN TRY
    --if procedure does not exist, create a simple version that the ALTER will replace.  if it does exist, the BEGIN CATCH will eliminate any error message or batch stoppage
    EXEC ('CREATE PROCEDURE AAAAAAAA AS DECLARE @A varchar(100); SET @A=ISNULL(OBJECT_NAME(@@PROCID), ''unknown'')+'' was not created!''; RAISERROR(@A,16,1);return 9999')
END TRY BEGIN CATCH END CATCH
GO

ALTER PROCEDURE AAAAAAAA 
(
     @ParamsHere varchar(10)
)
AS
PRINT 'HERE IN '+(OBJECT_NAME(@@PROCID))
GO