[[[ Original Message from Peter Eisentraut <[EMAIL PROTECTED]> ]]]
> [EMAIL PROTECTED] writes:
>
> > Connection.setCatalog(String database) should connect to the specified database.
>
> The JDBC spec says:
>
> : Sets a catalog name in order to select a subspace of this Connection's
> : database in which to work. If the driver does not support catalogs, it
> : will silently ignore this request.
>
> Note the part about "subspace". In PostgreSQL, the database/catalog is
> fixed when the connection is established. On other systems you can
> probably change the database/catalog while keeping the connection. But
> you cannot establish a new connection if the spec says that this method
> should make a selection among the objects available in the current
> connection.
What do they mean by database though? It is vague because the definitions are not
clear, but I interpret it like this: A "catalog" equals "PostgreSQL database" which is
a subset of the whole "database" assuming "database" in this context to mean the whole
server. I realise that the "catalog" is fixed but this is also the case for MySQL.
Note it doesn't say "in current connection" so no reason why you can't create a new
one. The bottom line is that supporting them would make life easier for people like me
writing a database admin tool.
By the way, you've already applied my suggested changes to
DatabaseMetaData.getCatalogs() - supporting that would imply supporting
Driver.set/getCatalog().
You may want to check what other similar drivers do, but as far as I can see the only
reason for not implementing catalog support is if you have a database (e.g. Interbase)
where you only connect to one "catalog" which is a file location - you can't actually
list other available catalogs.
I hope that clarifies the way I see it.
> > The DatabaseMetaData.supportsCatalogsInXXX() may need to be modified.
>
> These methods are all implemented correctly.
>
> > I'm not sure about the stuff in DatabaseMetaData.getTables() for
> > example - at the moment specifying null gets all the tables in the
> > database which the driver is currently connected to. I think this is
> > fine - but different database name patterns might be specified and
> > they may have to be implemented?
>
> Yup. We'll just throw an SQLException in that case.
Yes, that isn't really a problem. But _if_ you want to support catalogs maybe you have
to go the whole way?
Thanks,
Jason Davies
[EMAIL PROTECTED]
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