Обсуждение: current_database()

Quick system function to pull out the current database.

I've used this a number of times to allow stored procedures to find out
where they are.  Especially useful for those that do logging or hit a
remote server.

It's called current_database() to match with current_user().

On Tue, 2002-08-06 at 21:15, Rod Taylor wrote:
> Quick system function to pull out the current database.
>
> I've used this a number of times to allow stored procedures to find out
> where they are.  Especially useful for those that do logging or hit a
> remote server.
>
> It's called current_database() to match with current_user().

It's also a necessity for an informational schema.  The catalog
(database) name is required in a number of places.

Rod Taylor <rbt@zort.ca> writes:
> + Datum
> + current_database(PG_FUNCTION_ARGS)
> + {
> +     PG_RETURN_NAME(DatabaseName);
>   }

DatabaseName is not actually a NAME, only a C string.  You need a palloc
and a namestrcpy in there.

            regards, tom lane

On Wed, 2002-08-07 at 00:10, Tom Lane wrote:
> Rod Taylor <rbt@zort.ca> writes:
> > + Datum
> > + current_database(PG_FUNCTION_ARGS)
> > + {
> > +     PG_RETURN_NAME(DatabaseName);
> >   }
>
> DatabaseName is not actually a NAME, only a C string.  You need a palloc
> and a namestrcpy in there.

Hmm.. Oops.

Rod Taylor <rbt@zort.ca> writes:
>> DatabaseName is not actually a NAME, only a C string.  You need a palloc
>> and a namestrcpy in there.

> Hmm.. Oops.

That's better ... but we also need a patch to the SGML documentation
(probably it belongs in misc/session information functions).

            regards, tom lane

Your patch has been added to the PostgreSQL unapplied patches list at:

    http://candle.pha.pa.us/cgi-bin/pgpatches

I will try to apply it within the next 48 hours.

---------------------------------------------------------------------------


Rod Taylor wrote:
> On Wed, 2002-08-07 at 00:10, Tom Lane wrote:
> > Rod Taylor <rbt@zort.ca> writes:
> > > + Datum
> > > + current_database(PG_FUNCTION_ARGS)
> > > + {
> > > +     PG_RETURN_NAME(DatabaseName);
> > >   }
> >
> > DatabaseName is not actually a NAME, only a C string.  You need a palloc
> > and a namestrcpy in there.
>
> Hmm.. Oops.

[ Attachment, skipping... ]

>
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--
  Bruce Momjian                        |  http://candle.pha.pa.us
  pgman@candle.pha.pa.us               |  (610) 359-1001
  +  If your life is a hard drive,     |  13 Roberts Road
  +  Christ can be your backup.        |  Newtown Square, Pennsylvania 19073

Patch applied with docs.  Thanks.

---------------------------------------------------------------------------


Rod Taylor wrote:
> On Tue, 2002-08-06 at 21:15, Rod Taylor wrote:
> > Quick system function to pull out the current database.
> >
> > I've used this a number of times to allow stored procedures to find out
> > where they are.  Especially useful for those that do logging or hit a
> > remote server.
> >
> > It's called current_database() to match with current_user().
>
> It's also a necessity for an informational schema.  The catalog
> (database) name is required in a number of places.
>
>
> ---------------------------(end of broadcast)---------------------------
> TIP 4: Don't 'kill -9' the postmaster
>

--
  Bruce Momjian                        |  http://candle.pha.pa.us
  pgman@candle.pha.pa.us               |  (610) 359-1001
  +  If your life is a hard drive,     |  13 Roberts Road
  +  Christ can be your backup.        |  Newtown Square, Pennsylvania 19073