AB INITIO - LOOKUP FUNCTION

LOOKUP FUNCTION  lookup_next() §  Lookup_next will give you the next available match in the Lookup file. §  Lookup_next should be Preceded after successful call to lookup, lookup_count, lookup_match, lookup_nth, lookup_range, or lookup_next itself. §  The lookup_next function returns NULL if you call it more times than the number of matching records in the file, or if the next matching record does not exist. §  Behavior of lookup_next() on different calls                   The next successive matching record after the previous call to lookup or lookup_range.                   The first matching record after the previous call to lookup_count or lookup_match.                   The (n+1)st successive matching record after the previous call to lookup_nth.                   The next successive matching record after the previous call to lookup_next itself. SYNTAX AND EXAMPLE

Syntax -           lookup_next(lookup_file) Example –            Preceding lookup_next with lookup_count can be useful when you need to know how many records                    will be returned.           Once you have the count of records, you call lookup_next inside a loop to retrieve them all.                     let integer(4) i = 0;                     let integer(4) n = lookup_count("MyLookup", in.key);                     let my_type[integer(4)] result_vector = for (i, i < n) : lookup_next("MyLookup");           The first call to lookup_next, following the call to lookup_count, returns the first matching record from           MyLookup.           Subsequent loop iterations return the balance of the n matching records and store them in                result_vector.