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71 lines
2.4 KiB
71 lines
2.4 KiB
10 years ago
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---
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layout: post
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status: publish
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published: true
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title: 'PostgreSQL 101'
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author:
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display_name: 'sipp11'
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date: '2013-10-26'
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categories:
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- database
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tags: postgresql 101
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---
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I found that PostgreSQL works differently to MySQL. PostgreSQL will accept command from both command shell ($) and PostgreSQL shell (postgres=#). When you create database, drop database, you can do from command shell:
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$ createdb <database-name> -E UTF8
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$ dropdb <database-name>
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while [charset support listed here](http://www.postgresql.org/docs/8.4/static/multibyte.html#MULTIBYTE-CHARSET-SUPPORTED). or you can create database inside postgres shell.
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$ psql
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postgres=# create database <database-name>
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postgres=# drop database <database-name>
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To do some basic query, it's pretty like MySQL. However, it's vastly different when it comes to list/describe
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postgres=# \l # show databases
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postgres=# \connect <database-name> # use database
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<database-name>=# \d # show tables
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<database-name>=# \d <table-name> # show columns
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<database-name>=# \d+ <table-name> # describe table
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Configure for remote connection
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### Server side
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Edit `/etc/postgres/x.x/main/postgresql.conf`
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listen_addresses = '*'
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Add line to `/etc/postgres/x.x/main/pg_hba.conf`
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host all all 0.0.0.0/0 md5
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or you could do things like `192.168.1.1/24` if you want to limit to your subnet.
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Creating remote user isn't anything different from what local user is:
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$ psql template1
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template1=# create user <user-name> with password '<your-password>';
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template1=# \connect <database-name>;
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<database-name>=> GRANT USAGE ON SCHEMA public to <user-name>;
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<database-name>=> GRANT SELECT ON ALL TABLES IN SCHEMA public TO <user-name>;
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<database-name>=> GRANT UPDATE ON ALL TABLES IN SCHEMA public TO <user-name>;
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<database-name>=> GRANT ALL ON ALL TABLES IN SCHEMA public TO <user-name>;
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<database-name>=> ALTER DEFAULT PRIVILEGES IN SCHEMA public GRANT SELECT ON TABLES TO <user-name>;
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<database-name>=> GRANT USAGE, SELECT ON SEQUENCE <table_name>_id_seq TO <user-name>;
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<database-name>=> GRANT USAGE, SELECT ON ALL SEQUENCES IN SCHEMA <schema_name> TO <user-name>;
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<database-name>=> \q
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### Client side
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Pretty much like MySQL
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$ psql -h <postgres-server> -d <database-name> -U <user-name>
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If you don't have postgresql client yet
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# apt-get install postgresql-client-x.x
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while x.x means version, e.g. `postgresql-client-9.1`
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