To update a record in a KSAM file, the HPFOPEN or FOPEN intrinsic call to open the file must specify update
access. This is set by the aoption parameter. Normally, you would read the record with
one of the read intrinsics , to verify its contents before modification.
The FUPDATE intrinsic writes the contents of the buffer area
over the contents of the last record accessed. This buffer area
is identified in an FUPDATE intrinsic parameter. The written record must contain
all the key values expected by the file. If only a portion of the record
is updated, specified by the tcount parameter, this portion must contain all primary
and alternate key values. If it does not, a CCL condition is returned
and the update does not take place.
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