TRY / CATCH SYNTAX with a scalar function

I've been trying to incorporate the same TRY / CATCH code I use with sprocs in a scalar function.  (See the code snippet.)  No matter where I put the BEGIN TRY command and the END TRY / BEGIN CATCH commands the SQL compiler balks.  For example:

Msg 102, Level 15, State 1, Procedure centigrade_to_farenheit, Line 6
Incorrect syntax near 'TRY'.
Msg 102, Level 15, State 1, Procedure centigrade_to_farenheit, Line 11
Incorrect syntax near 'BEGIN'.

Is it possible to combine TRY / CATCH with functions?  
CREATE FUNCTION dbo.centigrade_to_farenheit (@centigrade float)
RETURNS float
WITH EXECUTE AS CALLER
AS
BEGIN TRY
BEGIN
     RETURN((@centigrade * 1.8) + 32.0)
END
END TRY
BEGIN CATCH
   INSERT INTO ErrorLog (ErrorDateTime, ErrorHint, ErrorNumber, ErrorLine, ErrorSeverity, ErrorState, ErrorMessage)
   VALUES (GETDATE(), @ErrorHint, ERROR_NUMBER(), ERROR_LINE(), ERROR_SEVERITY(), ERROR_STATE(),  ERROR_MESSAGE())   
END CATCH

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jdanaAsked:
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Aneesh RetnakaranDatabase AdministratorCommented:
Hello jdana,

I dont think you really need a TRY CATCH here

CREATE FUNCTION dbo.centigrade_to_farenheit (@centigrade float)
RETURNS float
WITH EXECUTE AS CALLER
AS
BEGIN
BEGIN TRY
     RETURN((@centigrade * 1.8) + 32.0)
END TRY
BEGIN CATCH
   INSERT INTO ErrorLog (ErrorDateTime, ErrorHint, ErrorNumber, ErrorLine, ErrorSeverity, ErrorState, ErrorMessage)
   VALUES (GETDATE(), @ErrorHint, ERROR_NUMBER(), ERROR_LINE(), ERROR_SEVERITY(), ERROR_STATE(),  ERROR_MESSAGE())  
END CATCH
END


GOD BLESS,

Aneesh R.
0
HoggZillaCommented:
The TRY&CATCH construct cannot be used in a user-defined function.
http://msdn.microsoft.com/en-us/library/ms175976.aspx 
0

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BrandonGalderisiCommented:
I believe you also can't do DML inside a function.
0
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jdanaAuthor Commented:
Brandon - What is DML?
0
Anthony PerkinsCommented:
DML: Data Manipulation Language.

DML statements: Insert, Update & Delete
0
jdanaAuthor Commented:
Thanks guys.
0
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