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A UDF [User Defined Function] is what is used to redefine output [to
a program] reading data from a database file. Use the correct tool for
the requirement.
The Read Trigger is used for auditing what was passed to the program
that issued the read request. If the Read Trigger could change the
data, then what was passed as data to the trigger for audit does not
match what was sent to the program; function defeated. Also IMO IBM
would almost have to refuse to ever investigate any problem where any
Read Trigger was involved [if ever changing the buffer were allowed],
except under a paid consultancy. Non-SQL trigger programs already were
costly, to the point where many inquiries as suspected defect were
effectively forced through ConsultLine before being /proven/ not to be a
usage error; in my experience over 95% were usage problems.
At least UDF enforces well-defined structure\typing whereas a read
trigger could rewrite the output from the following request to return "A
BUNCH OF GARBAGE" instead of "SIMPLE", either on purpose or by an error
in coding:
SELECT VARCHAR('SIMPLE') FROM SYSIBM.SYSDUMMY1
Regards, Chuck
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