V<Версия>__<Описание>.sql

-- V1__Create_users_table.sql
CREATE TABLE users (
    id SERIAL PRIMARY KEY,
    username VARCHAR(50) NOT NULL
);

R__<Описание>.sql

-- R__Update_user_view.sql
CREATE OR REPLACE VIEW user_view AS
SELECT id, username FROM users;

public class V2__InsertTestData implements JdbcMigration {
    @Override
    public void migrate(Connection connection) throws Exception {
        try (Statement stmt = connection.createStatement()) {
            stmt.execute("INSERT INTO users (username) VALUES ('admin')");
        }
    }
}

public class V3__AddAdminUser implements JavaMigration {
    @Override
    public void migrate(Context context) throws Exception {
        try (Statement stmt = context.getConnection().createStatement()) {
            stmt.execute("INSERT INTO users (username) VALUES ('superuser')");
        }
    }
}

V<Мажор>.<Минор>.<Патч>__<Описание>.sql

-- V1.2.3__Fix_email_constraint.sql
ALTER TABLE users ALTER COLUMN email SET NOT NULL;

-- V3__Drop_users_table.sql
DROP TABLE users;

-- V1__Initial_schema.sql
CREATE TABLE users (
    id INT PRIMARY KEY,
    name VARCHAR(100)
);

-- R__Update_view.sql
CREATE OR REPLACE VIEW active_users AS 
SELECT * FROM users WHERE deleted_at IS NULL;

public class V4__EncryptPasswords implements JavaMigration {
    @Override
    public void migrate(Context context) throws Exception {
        try (PreparedStatement ps = context.getConnection()
            .prepareStatement("UPDATE users SET password = encrypt(password)")) {
            ps.executeUpdate();
        }
    }
}

import java.util.stream.IntStream;

public class Task160625 {
    public static void main(String[] args) {
        IntStream.rangeClosed(1, 5)
                .filter(i -> i % 2 == 0)
                .peek(System.out::print)
                .forEachOrdered(i -> {});
    }
}