Run MySQL migration scripts sequentially from a specified directory, keeping track of current version in the database.
SQL Migration Runner
Python script to run SQL migration scripts sequentially from the specified folder, updating latest schema version in the database itself after each migration.
WARNING: this tool was created purely as a solution for the ECS Digital technical test. See PROBLEM for details of the use case and requirements for the task.
It almost certainly should not be used for any real-world use case, as mature solutions exist for almost every use case. See "Problem Overview" section of NOTES for further commentary on this topic.
- Python 2.7, or 3.5+
- Existing MySQL or MariaDB database, either running locally or on a remote host.
- Table called
versionTable, with a single
int(11)column named "version". See here for schema.
- Directory containing SQL scripts to execute to migrate the database to each version.
- Each migration / version should have one file.
- Files should be named to match the pattern
VERSION.brief_description.sql, where VERSION is an integer representing the database version after executing that script.
- Version numbers should be unique and sequential for consistent results.
To install Migration Runner, run this command in your terminal:
$ pip install migration_runner
This is the preferred method to install Migration Runner, as it will always install the most recent stable release.
For instructions on building from source, see the documentation.
migration_runner script with
--help to get usage instructions:
$ migration_runner --help Usage: migration_runner [OPTIONS] SQL_DIRECTORY DB_USER DB_HOST DB_NAME DB_PASSWORD A cli tool for executing SQL migrations in sequence. Options: -s, --single-file TEXT Filename of single SQL script to process. -l, --loglevel LVL Either CRITICAL, ERROR, WARNING, INFO or DEBUG -v, --version Show the version and exit. --help Show this message and exit.
$ migration_runner sql-migrations beveradb migration_runner_test.beveradb.tk test_user test_password 2019-02-10 22:16:30,394 - info: Starting with database version: 0 2019-02-10 22:16:30,395 - info: Migrations yet to be processed: 10 (out of 11 in dir) 2019-02-10 22:16:30,721 - info: Successfully upgraded database from version: 0 to 1 by executing migration in file: 'sql-migrations/001.create_migrations_version_table.sql' 2019-02-10 22:16:31,566 - info: Successfully upgraded database from version: 1 to 2 by executing migration in file: 'sql-migrations/2.set_current_version_to_1.sql' 2019-02-10 22:16:32,562 - info: Successfully upgraded database from version: 2 to 45 by executing migration in file: 'sql-migrations/045.createtable.sql' 2019-02-10 22:16:33,236 - info: Successfully upgraded database from version: 45 to 46 by executing migration in file: 'sql-migrations/046.create_seed_items.sql' 2019-02-10 22:16:34,173 - info: Successfully upgraded database from version: 46 to 48 by executing migration in file: 'sql-migrations/048.create_rooms.sql' 2019-02-10 22:16:34,849 - info: Successfully upgraded database from version: 48 to 49 by executing migration in file: 'sql-migrations/049 .rename-object-item.sql' 2019-02-10 22:16:36,258 - info: Successfully upgraded database from version: 49 to 51 by executing migration in file: 'sql-migrations/051-add-room-relations.sql' 2019-02-10 22:16:37,165 - info: Successfully upgraded database from version: 51 to 52 by executing migration in file: 'sql-migrations/052.create_customer_order.sql' 2019-02-10 22:16:38,299 - info: Successfully upgraded database from version: 52 to 54 by executing migration in file: 'sql-migrations/54-fix-customer-address-defaults.sql' 2019-02-10 22:16:39,150 - info: Successfully upgraded database from version: 54 to 55 by executing migration in file: 'sql-migrations/55exampleorder.sql' 2019-02-10 22:16:39,499 - info: Database version now 55 after processing 10 migrations. Remaining: 0.
Nothing to process:
$ migration_runner sql-migrations test_user beveradb.tk migration_runner_test test_password 2019-02-10 22:19:23,252 - info: Starting with database version: 55 2019-02-10 22:19:23,252 - info: Migrations yet to be processed: 0 (out of 11 in dir) 2019-02-10 22:19:23,252 - info: Database version now 55 after processing 0 migrations. Remaining: 0.
$ migration_runner sql-migrations test_user beveradb.tk migration_runner_test Usage: migration_runner [OPTIONS] SQL_DIRECTORY DB_USER DB_HOST DB_NAME DB_PASSWORD Try "migration_runner --help" for help. Error: Missing argument "DB_PASSWORD".
$ migration_runner -l DEBUG sql-migrations test_user beveradb.tk migration_runner_test fake_password 2019-02-10 22:21:48,074 - debug: CLI execution start 2019-02-10 22:21:48,075 - debug: Migrations found: 11 2019-02-10 22:21:48,075 - debug: Connecting to database with details: user=test_user, password=fake_password, host=beveradb.tk, db=migration_runner_test 2019-02-10 22:20:37,731 - error: Database connection error: 1045 (28000): Access denied for user 'test_user' (using password: YES)
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