public void addCustomerTest() throws Exception {        SqlSession sqlSession = MyBatisUtils.getSession();        CustomerMapper customerMapper = sqlSession.getMapper(CustomerMapper.class);        Customer customer = new Customer();        customer.setUsername("111");        customer.setJobs("111");        customer.setPhone("111");        customerMapper.addCustomer(customer);        sqlSession.commit();        sqlSession.close();    }

数据库查询操作可实现，但修改无法实现，且不报错，出现这种情况的原因之一：

事务忘记提交！

添加代码sqlSession.commit();

长点心就能少犯错误。