Assume that the stored procedure name is GETEMPSVR. The host variable PROCNAME is a character variable of length 254 or less that contains the value GETEMPSVR. You should use this technique if you do not know in advance the name of the stored procedure, but you do know the parameter list convention.
To pass your parameters in a single structure, rather than as separate host variables, code a statement like this:
EXEC SQL CALL GETEMPSVR USING DESCRIPTOR :ADDVALS END-EXEC
where ADDVALS is the name of an SQLDA.