@Test
  public void test() {
    SystemAdmin admin = new SystemAdmin();
    admin.setAdminId(41216998636L);
    admin.setAdminName("admin");
    admin.setPassword("4QrcOUm6Wau+VuBX8g+IPg==");

    Assert.assertEquals(1, systemAdminMapper.createSystemAdmin(admin));

    admin.setLastVisit(new Timestamp(System.currentTimeMillis()));

    Assert.assertEquals(1, systemAdminMapper.updateSystemAdmin(admin));

    admin = systemAdminMapper.getSystemAdminById(41216998636L);
    System.out.println(admin);

    for (SystemAdmin a : systemAdminMapper.getAllSystemAdmins()) {
      System.out.println(a);
    }
    System.out.println(systemAdminMapper.selectByRange(0, systemAdminMapper.count()));
  }
 @Before
 public void before() {
   Assert.assertEquals(1, systemAdminMapper.deleteSystemAdmin(41216998636L));
 }