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  3. August 2009

RE: Modernizing applications

I always run the selection criteria through SELECT first and verify
the results
before updating. Does not matter the database (DB2 with or without
journaling/commitment control, SQL Server, etc.).

Doesn't always help. You may have to subtly change the query to make it
an update instead of a select. Now, if you're journaling you do the
select, determine that 44 rows should be updated, start a transaction,
do the update, see that 440 rows were updated, say "ooops" and rollback.
No harm no foul. Or commit if the right number of rows were updated.

-Walden


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