CREATE FUNCTION inside BEGIN TRY and END TRY

All we need is an easy explanation of the problem, so here it is.

I want to use CREATE FUNCTION in a block that will "swallow" errors, but this

BEGIN TRY

CREATE FUNCTION test (@ID int)
RETURNS int
AS
BEGIN
    RETURN(2 * @ID)
END


END TRY
BEGIN CATCH
END CATCH 

results in

Msg 156, Level 15, State 1, Line 3 Incorrect syntax near the keyword
‘FUNCTION’. Msg 137, Level 15, State 2, Line 7 Must declare the scalar
variable "@ID".

Why?

How to solve :

I know you bored from this bug, So we are here to help you! Take a deep breath and look at the explanation of your problem. We have many solutions to this problem, But we recommend you to use the first method because it is tested & true method that will 100% work for you.

Method 1

Many DDL statements must either start a batch or be the only statement in a batch. So the general solution is to use dynamic SQL. EG

I want to use CREATE FUNCTION in a block that will "swallow" errors, but this

BEGIN TRY

exec('
CREATE FUNCTION test (@ID int)
RETURNS int
AS
BEGIN
    RETURN(2 * @ID)
END
')

END TRY
BEGIN CATCH
END CATCH 

Note: Use and implement method 1 because this method fully tested our system.
Thank you 🙂

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0

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