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Showing posts from July 29, 2013

Before you fire that delete command

Rule of thumb for me is that every DELETE or UPDATE query should start life as a SELECT query.


The eight stages of DELETE:

SELECT what you're deleting;fix the mistake in the query (there's always one);SELECT again;BEGIN TRANSACTION;DELETE;SELECT to confirm the right deletion -- twice for good measure, and maybe ROLLBACK once or twice if you're feeling twitchy;Hover finger anxiously over the un-entered COMMIT command for several seconds while resisting Dunning–Kruger effect;COMMIT. :)
Or alternately:

Give the table an DeletedTimestamp and DeleatedReason column.Mark the records as deleted.Run around like a lunatic and fix queries so they don't show "deleted" columns to the rest of the app. Rather create a "view" which never sends out "deleted" columns and rows.Make a page in the application where people can "restore" deleted items. Because they do stupid things too once in a while