In a user-defined routine (UDR), an OUT parameter corresponds to a value returned through a pointer. Before IDS version 9.4, IDS supported no more than one OUT parameter in a UDR, and any OUT parameter was required to appear as the last item in the parameter list. IDS version 9.4 drops these restrictions, supporting multiple OUT parameters anywhere in the parameter list of the UDR. This feature is available when you use the I10 interface. It provides greater flexibility in defining UDRs, and removes the need to return collection variables in contexts where multiple returned values are required.
To return OUT parameters from a UDR, you must use statement local variables (SLVs).
In the following statement, the OUT parameter in the UDR myfunc is defined using the SLV syntax slvname#out_param_type.
SELECT sales FROM mytable WHERE myfunc(10, sales#money) < 1000
Informix does not support invoking a UDR with OUT parameters using an EXECUTE statement, therefore multiple OUT parameters are not supported in PowerBuilder remote procedure calls and embedded SQL EXECUTE PROCEDURE commands.
