Quick start

\d pg_database select * from pg_database;

select * from pg_user

This PhpWiki pgsql install is perfect tutorial for PostgreSQL basics.

by Hans Schou 2003-04-16 A short description of how I got PhpWiki to work with PostgreSQL.

Related to PhpWiki version 1.3.4.

In the following some user defined names are used. Search and replace the names with what you want to use:

localhost    Domain name for PhpWiki and PostgreSQL
dschou_dk    Name of PostgreSQL database
uschou_dk    Username of owner of database
pschou_dk    Password for database
pwadmin      PhpWiki administrator
foobar       PhpWiki administrator password
rtGdfs8dp    PhpWiki administrator password encrypted
pw_          Table name prefix

Install packages

This is the package names used in Mandrake 9.0.

postgresql-server
php-pgsql

Give user postgres a password

su -
passwd postgres

Change pgsql connect method

We want all users listed in PostgreSQLs user list to be able to connect. Only users local on the same machine can connect - no TCP/IP connections. Login as user 'postgres'

su -
su - postgres

In /var/lib/pgsql/data/pg_hba.conf change auth to:

local   all     password

Restart PostgreSQL

su - -c "/etc/init.d/postgresql restart"

Create a user in PostgreSQL

su - postgres
createuser -A -D -P uschou_dk

(password is 'pschou_dk' in this example)

Create a database for user uschou_dk

You could use the database owned by the Apache user but I don't like it that way.

su - postgres
createdb dschou_dk

Change owner of database 'dschou_dk'

(There must be an easier way to do it)

su - postgres
psql -c "UPDATE pg_database SET datdba=(SELECT usesysid FROM pg_shadow WHERE usename='uschou_dk') WHERE datname='dschou_dk'"

Check everything is correct:

psql -l | grep dschou_dk
   dschou_dk  | uschou_dk | SQL_ASCII

Change user and prefix in schemas/psql.sql

Edit schemas/psql.sql

\set prefix     'pw_'
\set httpd_user 'uschou_dk'

Create phpwiki tables

cd phpwiki
psql -W -d dschou_dk -U uschou_dk < schemas/psql.sql

(I get some errors here, so run it twice)

Create an encrypted ADMIN password

Start your “any browser”:

lynx http://localhost/phpwiki/passencrypt.php

(enter foobar and get the encrypted text) Copy the encrypted password into index.php:

if (!defined('ADMIN_USER')) define('ADMIN_USER', "pwadmin");
if (!defined('ADMIN_PASSWD')) define('ADMIN_PASSWD', "rtGdfs8dp");
if (!defined('ENCRYPTED_PASSWD')) define('ENCRYPTED_PASSWD', true);

Change phpwiki index.php

cd phpwiki

Edit index.php

'dbtype' => 'SQL',
'dsn' => 'pgsql://uschou_dk:pschou_dk@socket()/dschou_dk',
'prefix' => 'pw_',

Hint, if you want to connect via TCP:

'dsn' => 'pgsql://uschou_dk:pschou_dk@localhost/dschou_dk',

or more specific with protocol and port number:

'dsn' => 'pgsql://uschou_dk:pschou_dk@tcp()localhost:5432/dschou_dk',

Fire up PhpWiki

First create some default pages:

lynx http://localhost/phpwiki/

Check it out:

lynx http://localhost/phpwiki/

Login: pwadmin
Password: foobar

How much space does PhpWiki use?

DATID=$(psql -t -c "SELECT datid FROM pg_stat_database WHERE datname='dschou_dk'")
du -h /var/lib/pgsql/data/base/$DATID

This page was shamelessly copied from here

Migrating from one server to another

pg_dump -C -h localhost -U localuser dbname | psql -h remotehost -U remoteuser dbname

* http://stackoverflow.com/questions/1237725/how-to-copy-postgres-database-to-another-server

Verze pro scripty

pgdump -U user -h localhost dbname | bzip2 > dbname.sql.bz

Pokud se prikaz vola v cronu pod rootem, je nutne vnutit postgresu heslo na uzivatele, krery ma k dumpovane db pristup (byt by to byl postgres). To se nastavuje v souboru /root/.pgpass a to ve tvaru hostname:port:database:username:password, tzn. *:*:*:postgres:passwd . Pozor, sooubor musi mit prava 0600. jinak jej dump ignoruje!

Pokud narazite na chyby s LOCK relation, je treba zmenit uzivatele co dumpuje, nebo ptidat tomu soucasnemu spousta GRANT SELECT, nebo z nej udelat superusera.

Mazani foreign keys

Nekdy se trochu nestatne stane, ze potrebujete smazat neco, co ma foreign key na tabulku, ktera ho ma na to, co chcete smazat. Takze Vam jedno nedovoli smazat druhe kvlu zavislosti a stejne tak naopak. Na to existuje hezky tricek, kdy kontrolu zavislosti nechate az na konec, kdy je vse smazane a tudiz ok :)

BEGIN TRANSACTION DEFERRABLE;
DELETE FROM a WHERE id='666';
DELETE FROM b WHERE di='999';
COMMIT;

Table of Contents

Quick start

Migrating from one server to another

Mazani foreign keys