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  1.  Home
  2. RPG400-L
  3. March 2007

Chain null

I have a file (table) with the key composed of two fields, the second one is "null capable", the first one can repeat. Like: 

key1 key2
123  a
123  b
123  null
123  x
123  null
124  s
...
I need to update the record with the null (it doen't matter if it is the 3rd or the 5th) 

Can I get reliable results with?:
key1 = 123; // or something coming from earlier process... 
%nullind(key2) = *on;
chain (key1: key2) file; // Will the chain return "not %found" if there are none (123: null) records? 
%nullind(key2) = *off;
key2 = new_value;
update record_in_file;
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