Informix DataBlade API Programmer's Manual DataBlade API Function Descriptions

The mi_fp_setargisnull() accessor function sets the value of an argument of a user-defined routine to an SQL NULL in its associated MI_FPARAM structure.

void mi_fp_setargisnull(fparam_ptr, arg_pos, is_null)

MI_FPARAM *fparam_ptr;

mi_integer arg_pos;

mi_integer is_null;

fparam_ptr	is a pointer to the associated MI_FPARAM structure.
arg_pos	is the index position into the null-argument array for the argument that you want set to NULL.
is_null	is the value that determines whether the arg_pos+1 argument is NULL.

Valid in Client LIBMI Application?	Valid in User-Defined Routine?
Yes	Yes

The mi_fp_setargisnull() function sets the routine argument at position arg_pos in the MI_FPARAM structure that fparam_ptr references to the appropriate SQL NULL value. The MI_FPARAM structure stores information about whether routine arguments are NULL in the zero-based null-argument array. To set the nth argument, use an arg_pos value of n-1. For example, the following call to mi_fp_setargisnull() sets to NULL the third argument of the my_func() UDR, with which fparam1 is associated:

mi_integer my_func(...., fparam1)
	

	MI_FPARAM *fparam1;
{
	

	mi_fp_setargisnull(fparam1, 2, MI_TRUE);

You can specify the following values for the is_null argument.

None.

See the descriptions of the following functions: mi_fp_argisnull(), mi_fp_setarglen(), mi_fp_setargprec(), mi_fp_setargscale(), mi_fp_setargtype(), mi_fp_returnisnull(), and mi_fp_setreturnisnull().