# sql-migrate [-d sqldir] <command> [args]
sql-migrate -d ./sql/migrations/ init --sql-command psql
sql-migrate -d ./sql/migrations/ up 3
sql-migrate -d ./sql/migrations/ down 2

Features

Locally-stored Migrations (not in DB)
Migration log can be hand edited to easily roll forwards or backwards
Migrations are simple shell scripts
Works with any database (just change the command)

Overview

Migration Directory
Migration Log
Migrations Files (up, down)

Migration Directory

Lexicographically-sortable files in the format <sequence>_<description>.<up|down>.sql:

migrations/
├── _migrations.sql
├── 0001-01-01-001000_init-migrations.sql
├── 2021-02-03-001000_init-app.up.sql
├── 2021-02-03-001000_init-app.down.sql
├── 2021-02-03-001000_add-products.up.sql
├── 2021-02-03-002000_add-products.down.sql
├── 2021-02-03-003000_add-customers.up.sql
└── 2021-02-03-003000_add-customers.down.sql

Migration Log

A simple list of migration names.

./sql/migrations.log:

0001-01-01-001000_init-migrations
2021-02-03-001000_init-app
2021-02-03-002000_add-products
2021-02-03-003000_add-customers

Change command to work with any database.

Migration Files

Simply SQL. Comments are generated for easy finding with grep.

2021-02-03-002000_add-products.up.sql:

-- add-products (up)
CREATE TABLE "products" (
   slug VARCHAR(127) NOT NULL,
   name VARCHAR(255) NOT NULL,
   price INTEGER NOT NULL,
   created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
   updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
   revoked_at TIMESTAMP,
   PRIMARY KEY ("slug")
);

2021-02-03-002000_add-products.down.sql:

-- add-products (down)
DROP TABLE IF EXISTS "products";

Usage

sql-migrate -d ./sql/migrations/ init --sql-command <psql|mariadb|mysql> --migrations-log ./sql/migrations.log
sql-migrate -d ./sql/migrations/ create <kebab-case-description>
sql-migrate -d ./sql/migrations/ status
sql-migrate -d ./sql/migrations/ up 99
sql-migrate -d ./sql/migrations/ down 1
sql-migrate -d ./sql/migrations/ list

See sql-migrate help for details.

COMMANDS
   init          - creates migrations directory, initial migration, log file,
	                and query for migrations
   create        - creates a new, canonically-named up/down file pair in the
                   migrations directory, with corresponding insert
   status        - shows the same output as if processing a forward-migration
   up [n]        - create a script to run pending migrations (ALL by default)
   down [n]      - create a script to roll back migrations (ONE by default)
   list          - lists migrations

OPTIONS
   -d <migrations directory>  default: ./sql/migrations/
   --help                     show command-specific help

NOTES
   Migrations files are in the following format:
      <yyyy-mm-dd>-<number>_<name>.<up|down>.sql
      2020-01-01-1000_init-app.up.sql

	The initial migration file contains configuration variables:
		-- migrations_log: ./sql/migrations.log
		-- sql_command: psql "$PG_URL" -v ON_ERROR_STOP=on --no-align --file %s

	The log is generated on each migration file contains a list of all migrations:
      0001-01-01-001000_migrations.up.sql
      2020-12-31-001000_init-app.up.sql
      2020-12-31-001100_add-customer-tables.up.sql
      2020-12-31-002000_add-ALL-THE-TABLES.up.sql

   The 'create' generates an up/down pair of files using the current date and
      the number 1000. If either file exists, the number is incremented by 1000 and
      tried again.