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Re: Checking for DB table existence using DBI/DBD

by JamesNC (Chaplain)
on Oct 14, 2005 at 11:47 UTC ( #500208=note: print w/ replies, xml ) Need Help??


in reply to Checking for DB table existence using DBI/DBD

Learn about EXISTS ( you need to know it so you can do an update/insert statement in the same pass anyway ) On MSSQL/Sybase I would do something like:
IF EXISTS ( SELECT 1 FROM sysobjects where name = 'some_table' and typ +e = 'U' ) -- do this if true ( maybe an update here ) SELECT 1 ELSE -- do this if false ( maybe an insert here ) SELECT 0
You need to consult the docs as to how your database implements EXISTS which normally operates on a subquery and returns a boolean.
JamesNC

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