A PostgreSQL database migration library with file-based, versioned schema management supporting both upgrades and downgrades, in Dart.

Usage

import 'package:dbmigrator_psql/dbmigrator_psql.dart';
import 'package:postgres/postgres.dart';

void main() async {
  final conn = await Connection.open(
    Endpoint(host: 'localhost', database: 'test_db'),
    settings: ConnectionSettings(sslMode: SslMode.disable),
  );

  final res = await conn.migrator(options: PsqlMigrationOptions(path: './migrations')).migrate(version: '2.0.0');
  print(result.message); // "Migrated from 1.0.0 ➡ 2.0.0 in 3 seconds."
}

Features

Briefly, the package provides the following features:

• Semantic version resolution — migration versions are parsed, compared, and ordered using pub_semver.
• Upgrading & downgrading — determines whether to upgrade or downgrade based on the current vs. target version.
• Two migration file structure modes:
  • File-based — .[up|down].sql files named with their version (e.g., 1.0.0.up.sql, 1.0.0.down.sql, 1.2.0_add_users.up.sql).
  • Directory-based — version-named subdirectories containing .[up|down].sql files.
• Multiple files with the same version prefix are supported and executed in alphabetical order (e.g., 1.2.0_a_core_tables.up.sql, 1.2.0_b_crm_tables.up.sql), in both file-based and directory-based structures.
• SHA-256 checksum verification — optional integrity checks to detect migration files modified after applying the migration.
• Migration locks — acquire and release migration locks to ensure no other migration can be performed at the same time (essential in clustered environments).
• Transaction-safe execution — provides the foundation to execute all migration files under a single transaction context.
• Retry logic — configurable retry attempts and timeouts for failed migration operations.

For a detailed list of features and configuration options, see the dbmigrator, which implements the migration logic this package derives from.

Additional information

Other RDBMS migration tools

• dbmigrator_mysql - Migrations for MySQL databases.
• dbmigrator_mssql - Migrations for Microsoft SQL Server databases.

Contributing

Please file feature requests and bugs at the issue tracker.

License

Licensed under the BSD-3-Clause License.