public class H2Test {
    public DataSource dataSource() {
        JdbcDataSource dataSource = new JdbcDataSource();
        dataSource.setUrl("jdbc:h2:./h2/h2");
        return dataSource;
    }

    public void doTest() {
        JdbcTemplate jdbcTemplate = new JdbcTemplate(dataSource());
        jdbcTemplate.execute("CREATE TABLE IF NOT EXISTS Message (id INTEGER PRIMARY KEY, text TEXT);");
        long startTime = System.currentTimeMillis();

        for (int i = 0; i < 3000; i++) {
            jdbcTemplate.update("INSERT INTO Message (id, text) VALUES (" + i + ", '123');");
        }

        long endTime = TimeUnit.MILLISECONDS.toSeconds(System.currentTimeMillis() - startTime);
        System.out.println(endTime);
    }
}