Informix DataBlade API Programmer's Manual DataBlade API Function Descriptions

The mi_func_isvariant() function determines whether the user-defined function associated with a function descriptor is variant.

mi_integer mi_func_isvariant(funcdesc_ptr)

MI_FUNC_DESC *funcdesc_ptr;

funcdesc_ptr

is a pointer to a function descriptor of the user-defined function to check.

Valid in Client LIBMI Application?	Valid in User-Defined Routine?
No	Yes

The mi_func_isvariant() function determines whether the user-defined function associated with the funcdesc_ptr function descriptor is variant. A user-defined function is variant if it either:

• returns different results when it is invoked with the same arguments.
• modifies a database or variable state.

You can register a UDR as variant with the VARIANT routine modifier. If you do not specify the VARIANT or NOT VARIANT routine modifier with the CREATE FUNCTION or CREATE PROCEDURE statement, the user-defined routine is variant.

See the descriptions of the following functions: mi_cast_get(), mi_func_handlesnulls(), mi_func_negator(), mi_routine_get(), mi_routine_get_by_typeid(), and mi_td_cast_get().

For more information, see Checking for a Variant Function.