pg-bump

pg-bump

SQL migration CLI for PostgreSQL.

What is it?

pg-bump provides command line management of PostgreSQL database schema migrations authored in "Plain SQL". It presumes that a) you are checking schema migrations into source control and b) you are using environment variables for your application configuration.

pg-bump is primarily intended for use as an executable in package.json scripts. By default, applying or reverting migrations is run in a single transaction. However, this can be disabled via command line options.

ESM-only

As of v4, pg-bump is an ECMAScript module. This should not matter much as it is intended to be used as a CLI application and ESM has been supported since Node.js v12. v3 is still CommonJS.

Powered by @porsager/postgres

As of v4, pg-bump connects to PostgreSQL with the postgres package instead of pg.

Installation

To add pg-bump to your dependencies do:

λ npm i pg-bump

It is possible to install pg-bump globally, but I never recommend global installs and I don't know why some people still suggest it.

λ npm i -g pg-bump

Commands

You can view the CLI documentation using npx pg-bump --help.

Usage: pg-bump [options] [command]

SQL migration CLI for PostgreSQL.

Options:
  -v, --version             output the version number
  -c, --config-path <path>  relative path to config file
  -r, --require <hook...>   require modules for side effects
  -f, --files <path>        relative path to migrations directory
  -e, --env-var <variable>  database url environment variable
  -j, --journal <table>     table used to record migration history
  -h, --help                display help for command

Commands:
  make|create <migration>   create a new migration file
  status                    show pending migrations
  up [options]              apply pending migrations
  down [options]            revert synced migrations
  help [command]            display help for command

Creating a Migration

The pg-bump make command generates new .sql migrations in your migrations directory (defaults to ./migrations). The migration is split into two files: up.sql and down.sql.

λ npx pg-bump make --help
# Usage: pg-bump make|create [options] <migration>
#
# create a new migration file
#
# Arguments:
#   migration   name of new migration
#
# Options:
#   -h, --help  display help for command

Example

λ npx pg-bump make create_table_users
# [pg-bump]  created: <unix-time-in-ms>_create-table-users/{up,down}.sql

λ tree migrations
# migrations/
# └── <unix-time-in-ms>_create-table-users
#     ├── down.sql
#     └── up.sql

Applying Migrations

The pg-bump up command applies all pending migrations.

λ npx pg-bump up --help
# Usage: pg-bump up [options]
#
# apply pending migrations
#
# Options:
#   -l, --lock         acquire advisory lock during migration (default: true)
#   --no-lock          skip advisory lock during migration
#   -t, --transaction  wrap migrations in a transaction (default: true)
#   --no-transaction   do not run migrations in a transaction
#   -h, --help         display help for command

Example

λ npx pg-bump up
# [pg-bump] applied 3 migrations
#        1: 1656785255267_create-table-foos
#        2: 1656785259822_create-table-bars
#        3: 1656785263539_create-table-bazzes

Reverting Migrations

The pg-bump down command reverts migrations. Include --to <version> to only revert migrations to, but not including <version>.

λ npx pg-bump down --help
# Usage: pg-bump down [options]
#
# revert synced migrations
#
# Options:
#   --no-lock          skip advisory lock during migration
#   -l, --lock         acquire advisory lock during migration (default: true)
#   --no-transaction   do not run migrations in a transaction
#   -t, --transaction  wrap migrations in a transaction (default: true)
#   --to <version>     revert to schema <version>
#   -h, --help         display help for command

Example

λ npx pg-bump down
# [pg-bump] reverted 3 migrations
#        3: 1656785263539_create-table-bazzes
#        2: 1656785259822_create-table-bars
#        1: 1656785255267_create-table-foos

Inspecting Migration State

List applied and pending migrations with the pg-bump status command.

λ npx pg-bump status --help
# Usage: pg-bump status [options]
#
# list applied and pending migrations
#
# Options:
#   -h, --help  display help for command

Example

λ npx pg-bump status
# [pg-bump] found 1 pending migration
#        1: 1656785255267_create-table-foos
#        2: 1656785259822_create-table-bars
# (pending) 1656785263539_create-table-bazzes

Development

Contributions welcome! If you add functionality or options, please include tests.

Environment Variables and Docker

docker-compose can be used to start and stop a local PostgreSQL instance if you don't have a server running on your machine. If necessary, you can override docker-compose.yml.

Copy the .env Template

cp .env.example .env

Start PostgreSQL Container and pgweb

docker-compose up --build -d

Run Tests

npm test

Generate Coverage Report

npm run cover