INFORMIX-ESQL/C Programmer's Manual ESQL/C Function Library

The ifx_var_isnull() function checks whether an lvarchar or var binary host variable contains a null value.

mint ifx_var_isnull(var_bin)

	var binary **var_bin;

mint ifx_var_isnull(lvar)

	lvarchar **lvar;

 



var_bin  

is the address of the var binary host variable. 


lvar

is the address of the lvarchar pointer host variable.

The ifx_var_isnull() function checks for a null value in an lvarchar or var binary host variable. To determine whether an ESQL/C host variable of any other data type contains null, use the risnull() library function. For more information, see page B-330.

ifx_var_setnull()