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Database

amber db

The database or db command is one of the most common command that you will be operating. This command allows you to work with the database engine of choice when the Amber application was generated.

Here is a list of the commands available:

  • create Creates the database for the environment specified in your configuration file.
  • drop Drops the database for the environment specified in your configuration file.
  • migrate or m Migrates up or down the database version
  • rollback Rolls back your database to a specific version or to previous version
  • redo Repeats the database version specified or lasted version
  • status Prints the current database migration status
  • seed Adds initial data after a database is created
  • version Prints the database current version.
amber database [COMMANDS1 COMMANDS2...]

Arguments:
  COMMANDS (Accepts multiple)  drop create migrate rollback redo status version seed

Example Usages

Create

$ amber db create
Created database blog_development

Starting with version 0.3.5 - Amber made two changes regarding databases:

  • Amber will substitute hyphens - for underscores _ in database names to keep it PostgreSQL friendly.
  • The default user for pg databases is postgres rather than rootin your configuration file.

postgres://postgres:@localhost:5432/microsecond_blog_development

$ amber new microsecond-blog
$ cd microsecond-blog
$ amber db create
Created database microsecond_blog_development

Drop

$ amber db drop
Dropped database blog_development

Migrate

$ amber db migrate
Migrating db, current version: 0, target: 20170928204246
OK   20170928204246_create_post.sql

Rollback

$ amber db rollback
Migrating db, current version: 20170928204246, target: 0
OK   20170928204246_create_post.sql

Redo

$ amber db redo
Migrating db, current version: 20170928204246, target: 0
OK   20170928204246_create_post.sql
Migrating db, current version: 0, target: 20170928204246
OK   20170928204246_create_post.sql

Status

$ amber db status
Applied At                  Migration
=======================================
2017-09-28 20:44:22 UTC  -- 20170928204246_create_post.sql

Seed

$ amber db seed
Seeded database

Version

$ amber db version
20170928204246