Re: [HACKERS] dump/reload

On Tue, 2 Jun 1998, Bruce Momjian wrote:

> >
> >
> > they don't always work, in the case of a table with an attribute that
> > calls a function for its default value.
> >
> > postgres=> create function foo() returns int4 as 'select 1' language 'sql';
> > CREATE
> > postgres=> create table a (b int4 default foo());
> > CREATE
> >
> > % pg_dump postgres > tmpfile
> > % cat tmpfile
> > \connect - postgres
> > CREATE TABLE a (b int4 DEFAULT foo ( ));
> > \connect - postgres
> > CREATE FUNCTION foo ( ) RETURNS int4 AS 'select 1' LANGUAGE 'SQL';
> > COPY a FROM stdin;
> > \.
> > % destroydb
> > % createdb
> > % psql < tmpfile
> >
> > which of course doesn't work, because it tries to create the table before
> > the function, which fails.
> >
> > then it spits out the help message because it can't understand \.
> >
> > this happens every time I dump/reload my db
> >
> > not a super easy fix, because sql functions can depend on tables to be
> > created as well as table depending on functions.  are circular
> > references possible?  doesn't seem like they would be.
> >
> > so pg_dump would have to figure out what order to put the
> > table/function creation in.  perhaps having ppl manually re-ordering
> > the dump output (and documenting this accordingly!) is the best way.
> >
> >
>
> This is a good point, and something worth thinking about.  Maybe we
> could scan through the defaults for a table, and call the dumpfunction
> command for any functions.  Then when they are later attempted to be
> created, they would fail, or we could somehow mark them as already
> dumped.
>
Apologies for intrusion,

I have also a problem with pg_dump, I already posted a bug-report but
nobody replays. If you already know this problem, forget this message.

postgres=> create table prova (var varchar, bp bpchar check (bp='zero'));
CREATE
postgres=> create view wprova as select var from prova;
CREATE

$ pg_dump hygea -s prova > file
$ cat file

\connect - postgres
CREATE TABLE prova (var varchar(-5), bp char(-5)) CONSTRAINT prova_bp CHECK bp = 'zero';
COPY prova FROM stdin;
\.
---------------
. pg_dump don't recreate VIEWs
. recreates varchar as varchar(-5)
. recreates bpchar  as CHAR(-5)
. recreates CONSTRAINTs with wrong syntax
                                                             Jose'