Re: See postgre tables from PHP code

From: Andrew McMillan <andrew(at)morphoss(dot)com>
To: Félix Sánchez Rodríguez <fesanch(at)ciego(dot)cult(dot)cu>
Cc: PostgreSQLPHP <pgsql-php(at)postgresql(dot)org>
Subject: Re: See postgre tables from PHP code
Date: 2008-11-12 09:03:00
Message-ID: 1226480580.6868.246.camel@happy.mcmillan.net.nz
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On Mon, 2008-11-10 at 05:04 +0100, Félix Sánchez Rodríguez wrote:
> Hi everybody:
>
> I'm relatively new to PHP programming and I was recommended to use
> PostgreSQL as the site's database. However I haven't able to see my DB's
> tables from PHP. Here is my (very simple, I think) code:
>
> $pg = pg_connect("host=localhost port =5432 dbaname = ATM user=postgres
> password = mypassword");
> pg_query($pg,"select nick,contrasenna,nombre,apellidos from usuarios");
>
> Beside, I opened my PostgreSQL interface, called pgAdmin and run the same
> query inside the ATM database and the error was the same: "relation
> 'usuarios' was not found". It's like something else was needed to access the
> DB tables.

Is it possible that the tables are in a different schema?

For example, on a Mediawiki installation I have:

davical_wiki=# \d
No relations found.
davical_wiki=# set search_path TO 'mediawiki';
SET
davical_wiki=# \d
List of relations
Schema | Name | Type | Owner
-----------+-----------------------+----------+------------------
mediawiki | archive | table | davical_wikiuser
mediawiki | category | table | davical_wikiuser
mediawiki | category_id_seq | sequence | davical_wikiuser
...

You can refer to tables in a different schema by prefixing the table
name with the schema name and '.', e.g. mediawiki.archive

davical_wiki=# \d mediawiki.archive
Table "mediawiki.archive"
Column | Type | Modifiers
---------------+--------------------------+--------------------
ar_namespace | smallint | not null
ar_title | text | not null
...

The same prefixing syntax should work. The same 'set search_path ...'
syntax should also work if you do that after the pg_connect call.

If you're in psql, too, tab-completion should work, so if you go
\d<space><tab><tab> you will see a list of schema, like:

davical_wiki=# \d
information_schema. pg_catalog. pg_toast. public.
mediawiki. pg_temp_1. pg_toast_temp_1.

If I did that after setting the search path the autocomplete finds all
the tables in the mediawiki schema also.

Cheers,
Andrew.

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