Stumbled upon an error in reprojecting data from 900913 (Google Speherical Mercator) to 4326 (WGS84). I’m recalling this from my head now, the error was something related to “NAD sth”. Workaround was to convert it as follows:
1. 900913
2. 32650 (UTM for your area)
3. 4326
I’ll get the SQL from my ofcmate and paste it here…
This is a quick-command list of Postres. If you want detailed instructions, please visit the Postgres Manual.
How do I Show all databases?
1. Using “psql -l”
2. Using
postgres=# \l List of databases Name | Owner | Encoding ------------------+----------+---------- postgis | postgres | UTF8 postgres | postgres | UTF8 template0 | postgres | UTF8 template1 | postgres | UTF8 template_postgis | postgres | UTF8 (5 rows)
Note: Do not drop template databases if not necessary.
How do I run a script from the prompt?
psql -d cybersoftbj -u user -f myfile.sql
Its very useful in reloading user-defined functions.
How do I create a user/role?
CREATE ROLE lbs WITH LOGIN PASSWORD 'mypassword' SUPERUSER INHERIT CREATEDB CREATEROLE;
How do I change the password for a user/role?
ALTER ROLE lbs PASSWORD 'mynewpassword';
How to provide/restrict access privileges to tables?
GRANT SELECT ON TABLE table TO user;
REVOKE SELECT ON TABLE table FROM user;
How to dump database in a text file?
pg_dump -U lbs -d cybersoftbjv1 -h 127.0.0.1 -W > cybersoftbjv1.sql
How to dump database cleanly?
pg_dump -c -d -E UTF8 -h 127.0.0.1 -U lbs -W platform_v1 > platform_v1.sql
How to rename a database?
ALTER DATABASE beijing_app RENAME TO beijing_app_20080801;
How to update using two tables?
UPDATE road_for_update u
SET the_geom = r.the_geom
FROM roads r
WHERE r.rd_id = u.rd_id;
How to change a column type with Cast?
ALTER TABLE roads ALTER COLUMN class_new TYPE integer USING class_new::integer;
How to add a geometry column to a table?
EXAMPLE: SELECT AddGeometryColumn(‘public’, ‘poi’, ‘the_geom’, 4326, ‘POINT’, 2)
Changing column names with spaces?
ALTER TABLE class_aroundme RENAME "level 1" TO level_1;
Setting kernel shmmax for postgres
sysctl -w kernel.shmmax=134217728
Note: For permanent changes see /etc/sysctl.cfg11. How to backup table(s) from pg_dump?
pg_dump poi_beijing -t class -t poi_class -f $BACKUPDIR/test_$MYDATE.sql
1. Edit pg_hba.conf
# "local" is for Unix domain socket connections only local all all trust # IPv4 local connections: host all all 127.0.0.1/32 md5 host all all 192.168.1.0 255.255.255.0 md5 # IPv6 local connections: #host all all ::1/128 trust
2. Edit postgres.conf
55 56 listen_addresses = '*' # what IP address(es) to listen on; 57 # comma-separated list of addresses; 58 # defaults to 'localhost', '*' = all 59 # (change requires restart)
4. For CentOS5.1, create symbolic links:
ln -s /usr/local/lib/libproj.so.0 /usr/lib/libproj.so.0
ln -s /usr/local/lib/libgeos_c.so.1 /usr/lib/libgeos_c.so.1
ldconfig
/etc/init.d/postgresql stop
/etc/init.d/postgresql start
3. Postgis Post Install
createdb -E utf8 template_routing createlang plpgsql template_routing psql -d template_routing -f /usr/share/postgresql-8.3-postgis/lwpostgis.sql psql -d template_routing -f /usr/share/postgresql-8.3-postgis/spatial_ref_sys.sql psql -d template_routing -f /usr/share/postlbs/routing_core.sql psql -d template_routing -f /usr/share/postlbs/routing_core_wrappers.sql
Operating System: Debian sid
Versions:
1. Install base system and ssh
#vi /etc/apt/sources.list to include deb http://debian.cn99.com/debian etch main deb-src http://debian.cn99.com/debian etch main #apt-get update #apt-get upgrade libc6
2. Install the required packages for postgres8.3 and postgis1.3.3
#apt-get install sudo nmap telnet
#apt-get install python2.5 python2.5-dev python-setuptools
#apt-get install g++
#apt-get install build-essential cmake ibboost-graph-dev
#apt-get install libreadline5 libreadline5-dev
#apt-get install zlib-bin zlib1g-dev
#apt-get install libkrb5-dev
#apt-get install libcurl3
#apt-get install libssl-dev
#apt-get install postgresql-8.3
#apt-get install postgresql-8.3-postgis
#apt-get install postgresql-server-dev-8.3
3. Installing pgRouting
# tar -zxvf pgRouting-1.02.tgz # cmake . # make # make install
It seems very nice for the new PostGres8.3 installer to bundle up third party libraries installation with the new admin pack feature. Using this feature, you can install PostGis, nPgsql, etc. The installation was painless and smooth this time. I have to backup all my data though using pg_dump.
To lessen the learning curve on installing PostGres + PostGis together, I made a short flash movie here. There is no audio in the tutorial. The idea was to introduce PostGres to my Chinese staff. I have to remove PostGreSQL 8.2 first before installing 8.3.