T-SQL to CLR type mapping issue

Question

I have a simple function, written in VB.NET and have added the assembly to SQL Server 2008 R2 and am trying to create a user-defined function out of it. The error I am getting is:

CREATE FUNCTION for "ufn_Factorial2" failed because T-SQL and CLR types for return value do not match.

I have done a lot of research and found several, different, mappings (which is confusing in itself) and none of the pairings seem to work. Here are the VB code and the T-SQL statement;

VB code

' I did import the System.Data.SQLTypes namespace.
Public Shared Function Factorial(ByVal num As SqlInt16) As SqlInt16

T-SQL code

create function dbo.ufn_Factorial2 (@num smallint) returns smallint
external name dadFunctions.[myFunctions.clsFunctions].Factorial;

Does anybody have suggestions on how I can match up the data types correctly?

Thanks, Dennis

Answer 1

Are you sure, you are referencing correct assembly and correct function in the external name? I mean function with right data types? As from your code, the data types are correct. I mean SqlInt16 is equivalent for smallint which is 2 bytes signed integer.

Remember, that if you have changed the data types in the assembly and recompiled it, you have to redeploy the assembly into the database as the binary representation of the assembly is physically stored directly in the db.

Anyway, isn't smallint data type a little bit small for the Factorial function? (You will be able to calculate maximum 7! - Factorial of 7 as Factorial of 8 is 40320 which is out of smallint range.

T-SQL to CLR type mapping issue

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