The topics that follow provide details about the contents of the source code for a UDF. In general, the contents of the source code must:
- Define the SQL_TEXT constant
- Include the sqltypes_td.h header file
- Define the function parameter list in the order that matches the parameter passing convention specified in the CREATE FUNCTION statement
A C++ UDF or external procedure must catch all C++ exceptions by the end of the UDF or external procedure code. Any exception that is not caught and is thrown out from the routine may result in unexpected behavior.