Spring Boot測試數據庫連接

    @Autowired
    JdbcTemplate jdbcTemplate;

    @Test
    void fei3() { // 測試連接數據庫
        Long aLong = jdbcTemplate.queryForObject("select count(*) from user", Long.class);

        System.out.println("========================");
        System.out.println(aLong);
    }