Обсуждение: drop table before create

Hi ..

I have not been able to work out how to do this is Postgres 8
(pseudo-code)

 if exists table foo
   drop table foo;
 end
 create table foo;

If I go with

  drop table foo;
  create table foo;

then it barfs on an empty db.  I can find the table name in pg_class but
I am not sure of where to go from there.

The assumption here is that the SQL is coming in on a script via the
programmatic interface.  Slurp in a bunch of SQL commands and then fire
them at the database.

Perhaps it is just easier to 'dropdb' then 'createdb' and go from there.

Many thanks,


--
-mark.  (probertm at acm dot org)

>I have not been able to work out how to do this is Postgres 8
>(pseudo-code)
>
>  if exists table foo
>    drop table foo;
>  end
>  create table foo;
>
>If I go with
>
>   drop table foo;
>   create table foo;
>
>then it barfs on an empty db.


>The assumption here is that the SQL is coming in on a script via the
>programmatic interface.  Slurp in a bunch of SQL commands and then fire
>them at the database.
>


There are a couple of commands that may help you:

\set ON_ERROR_STOP
\unset ON_ERROR_STOP

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am  26.08.2005, um  2:11:30 +0430 mailte Lee Harr folgendes:
> >I have not been able to work out how to do this is Postgres 8
> >(pseudo-code)
> > if exists table foo
> >   drop table foo;
> > end
> > create table foo;
> >If I go with
> >  drop table foo;
> >  create table foo;
> >then it barfs on an empty db.

Perhaps this will help you:
http://www.milwaukeesoft.com/forums/viewtopic.php?t=79&sid=e9281cc9522a6b3c91b33407692c5db4


Regards, Andreas
--
Andreas Kretschmer    (Kontakt: siehe Header)
Heynitz:  035242/47212,      D1: 0160/7141639
GnuPG-ID 0x3FFF606C http://wwwkeys.de.pgp.net
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