That was my conclusion also, however, in pg7 adding a column, transfering the data to the new column, dropping the old one, and renaming the new one will also work.
Marc Dirix wrote: > Only postgresql 8 and above, which is still in unstable/experimental > (debian) allow column type altering. > This is not an option for users running 7.x. > > The only way to do this right in 7.x is to create a new table, insert > all data into the new table, > delete the old table and rename the new one. The old table should > obviously be blocked propperly before beginning. > > Kind regards, > > Marc > > > > Op 6-apr-2006, om 19:20 heeft Matthew Sayler het volgende geschreven: > >> On Thu, Apr 06, 2006 at 06:53:25PM +0200, Paul J Stevens wrote: >> >>> Perhaps some postgres dba/guru here knows how to do this gracefully: >>> >>> in dbmail-2.1 the type for the messageblk column in dbmail_messageblks >>> has been changed from TEXT to BYTEA to accomodate true binary data. >>> >>> I'm beginning to suspect this may/will lead to problems for people >>> upgrading from 2.0 to 2.1 while using postgres storage. >>> >>> So how can we provide a (preferably sql based) migration to change the >>> column type? >> >> >> No postgres knowledge here, but: >> >> http://www.postgresql.org/docs/8.1/static/sql-altertable.html >> >> The following syntax allows column altering with functions >> >> ALTER TABLE foo >> ALTER COLUMN foo_timestamp TYPE timestamp with time zone >> USING >> timestamp with time zone 'epoch' + foo_timestamp * >> interval '1 second'; >> >> We should be able to cook something up with encode() and friends. >> >> Matt >> >> >> _______________________________________________ >> Dbmail-dev mailing list >> Dbmail-dev@dbmail.org >> http://twister.fastxs.net/mailman/listinfo/dbmail-dev >> > > _______________________________________________ > Dbmail-dev mailing list > Dbmail-dev@dbmail.org > http://twister.fastxs.net/mailman/listinfo/dbmail-dev > -- ________________________________________________________________ Paul Stevens paul at nfg.nl NET FACILITIES GROUP GPG/PGP: 1024D/11F8CD31 The Netherlands________________________________http://www.nfg.nl
