bootique-flyway-demo

An example of versioned database migration built on Flyway integrated into Bootique.

For additional help/questions about this example send a message to Bootique forum.

You can find different versions of framework in use at

• 1.x
• 2.x

Prerequisites

* Java 1.8 or newer.
* Apache Maven.

Build the Demo

Here is how to build it:

git clone [email protected]:bootique-examples/bootique-flyway-demo.git
cd bootique-flyway-demo
mvn package

Run the Demo

Check the options available in your app:

java -jar target/bootique-flyway-demo-2.0-SNAPSHOT.jar

OPTIONS
  -b, --baseline
       Baselines an existing database, excluding all migrations up to and including baselineVersion.

  --clean
       Drops all objects (tables, views, procedures, triggers, ...) in the configured schemas.The schemas are cleaned in the order specified by the schemas property.

  --config=yaml_location
       Specifies YAML config location, which can be a file path or a URL.

  -h, --help
       Prints this message.

  -H, --help-config
       Prints information about application modules and their configuration options.

  -i, --info
       Prints the details and status information about all the migrations.

  -m, --migrate
       Migrates the schema to the latest version. Flyway will create the metadata table automatically if it doesn't exist.

  -r, --repair
       Repairs the metadata table.

  -v, --validate
       Validate applied migrations against resolved ones (on the filesystem or classpath) to detect accidental changes that may prevent the schema(s) from being recreated exactly.

An ordinary use case is when Flyway is pointed at an empty database. MySQL is used in the example.

Run the script to create an empty schema mydb:

-- -----------------------------------------------------
-- Schema mydb
-- -----------------------------------------------------
CREATE SCHEMA IF NOT EXISTS `mydb` DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci ;
USE `mydb` ;

Configure a database connection and migrations scripts locations in config.yml:

jdbc:
  mysql:
    url: jdbc:mysql://localhost:3306/mydb?nullNamePatternMatchesAll=true&connectTimeout=0&autoReconnect=true
    driverClassName: com.mysql.jdbc.Driver
    initialSize: 1
    username: root
    password:

flyway:
  locations:
    - db/migration
  dataSources:
    - mysql

Migrations can be written in SQL or Java.

Sample SQL script

V1__Create_new_table.sql

-- -----------------------------------------------------
-- Table `mydb`.`TEST`
-- -----------------------------------------------------
CREATE TABLE IF NOT EXISTS `mydb`.`TEST` (
  `id` BIGINT(19) NOT NULL AUTO_INCREMENT,
  `name` VARCHAR(100) NOT NULL,
  PRIMARY KEY (`id`));

-- INSERT
INSERT INTO mydb.TEST (name) VALUES ('test1');

Sample Class

V3__Update_table.java

public class V3__Update_table implements JdbcMigration {
    private static Logger LOGGER = LoggerFactory.getLogger(V3__Update_table.class);

    @Override
    public void migrate(Connection connection) throws Exception {
        PreparedStatement statement =
                connection.prepareStatement("INSERT INTO TEST (name) VALUES ('test3')");

        try {
            statement.execute();
        } catch (SQLException e) {
            LOGGER.error("Migration failed", e);
        } finally {
            statement.close();
        }
    }
}

Run migration:

java -jar target/bootique-flyway-demo-2.0-SNAPSHOT.jar --config=config.yml --migrate

Result:

...
INFO  [2017-06-28 16:03:23,888] main o.f.c.i.c.DbMigrate: Current version of schema `mydb`: << Empty Schema >>
INFO  [2017-06-28 16:03:23,888] main o.f.c.i.c.DbMigrate: Migrating schema `mydb` to version 1 - Create new table
INFO  [2017-06-28 16:03:23,950] main o.f.c.i.c.DbMigrate: Migrating schema `mydb` to version 2 - Insert data
INFO  [2017-06-28 16:03:23,958] main o.f.c.i.c.DbMigrate: Migrating schema `mydb` to version 3 - Update table
INFO  [2017-06-28 16:03:23,966] main o.f.c.i.c.DbMigrate: Successfully applied 3 migrations to schema `mydb` (execution time 00:00.195s).

All migrations are checked against the metadata table SCHEMA_VERSION located or created from scratch by Flyway.

Check table schema_version:

+----------------+-------------+-------------------+------+------------------------------+-----------+---------------+---------------------+----------------+---------+
| installed_rank | version     | description       | type | script                       | checksum  | installed_by  | installed_on        | execution_time | success |
+----------------+-------------+-------------------+------+------------------------------+-----------+---------------+---------------------+----------------+---------+
| 1              | 1           | Create new table  | SQL  | V1__Create_new_table.sql     | 804051539 | root          | 2017-06-28 19:03:23 | 54             | 1       |                        
| 2              | 2           | Insert data       | SQL  | V2__Insert_data.sql          | 292896403 | root          | 2017-06-28 19:03:23 | 2              | 1       |                                  
| 3              | 3           | Update table      | JDBC | db.migration.V3__Update_table| NULL      | root          | 2017-06-28 19:03:23 | 1              | 1       |                               
+----------------+-------------+-------------------+------+------------------------------+-----------+---------------+---------------------+----------------+---------+