Thread: pg_dump problem

PgSQL 7.0.2

    I used pg_dump to dump the schema of a db. I created table part_presencial
with this command

create table part_presencial(
login char(15) not null,
id_curso_polo int4 not null,
data_encontro date not null,
nota numeric(2,2) null,
foreign key(login,id_curso_polo) references matricula,
foreign key(id_curso_polo,data_encontro) references presencial,
primary key(login,id_curso_polo,data_encontro));

    But pg_dump gives me this:

CREATE TABLE "part_presencial" (
   "login" char(15) NOT NULL,
   "id_curso_polo" int4 NOT NULL,
   "data_encontro" date NOT NULL,
   "nota" numeric(2,2),
   PRIMARY KEY ("login", "id_curso_polo", "data_encontro")
);

Why doesn't pg_dump give me foreign keys constraints? It happens to all the
tables with foreign keys.


-----
Paulo Roberto Siqueira
paulo.siqueira@usa.net
Database Administrator
Goiania - GO - Brazil

At 22:05 3/08/00 -0300, Paulo Roberto Siqueira wrote:
>
>Why doesn't pg_dump give me foreign keys constraints? It happens to all the
>tables with foreign keys.

pg_dump does not restore the database by executing the same set of commands
as you used to create the database. Foreign key constraints are implemented
using a special kind of trigger (CONSTRAINT TRIGGER). If you look through
the pg_dump output, you will find a number of 'CREATE CONSTRAINT TRIGGER'
statements which will reapply the foreign key constraints.

This is definitely not an ideal situation, and with time I hope that
pg_dump output will become as close to ISO SQL as possible. But in the
example you quoted I would expect pg_dump to dump a basic 'create table'
statement followed by several 'alter table add constraint...' statements,
not one complex table definition.

Hope this helps,

Philip Warner.



----------------------------------------------------------------
Philip Warner                    |     __---_____
Albatross Consulting Pty. Ltd.   |----/       -  \
(A.C.N. 008 659 498)             |          /(@)   ______---_
Tel: (+61) 0500 83 82 81         |                 _________  \
Fax: (+61) 0500 83 82 82         |                 ___________ |
Http://www.rhyme.com.au          |                /           \|
                                 |    --________--
PGP key available upon request,  |  /
and from pgp5.ai.mit.edu:11371   |/