55 lines
1.2 KiB
Markdown
55 lines
1.2 KiB
Markdown
# Database migration
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[Detailed information about this](http://ian-shafer.github.io/2016/02/02/db-migrations/)
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## Setup
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#### Configuration
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All configuration needed is done in .configuration.sh.
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To avoid having to enter password for selected user on each run, just use a
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[.pgpass](http://www.postgresql.org/docs/9.3/static/libpq-pgpass.html) file.
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#### Migration files
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The files in the /migrations directory are changes to the scheme, not the full
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scheme.
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The naming convention for migration files are:
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- 000.000.sql
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- 000.001.sql
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- 000.002.sql
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- 000.003.sql
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- 000.004.sql
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- ...and so on
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**Example**
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The first file, `migrations/000.000.sql` may look like this:
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```
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create table users (
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name varchar(32) not null,
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primary key (name)
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);
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```
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The second file, `migrations/000.001.sql` may look like this:
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```
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alter table users
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add email varchar(256) not null;
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```
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#### Prerequisites
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One table needs to be created for the database to make this work:
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```
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CREATE TABLE database_versions (
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version varchar(32) not null,
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is_active boolean not null default false,
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creation_date timestamp not null default current_timestamp
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);
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```
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To do the actual migration, then just run:
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```
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# ./db-upgrade
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```
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