Question

我试图在Spring启动应用程序中使用JdbcTemplate.query获取表中的所有行。我使用MySQL数据库。我写了一个测试类来插入数据并通过它的主键查询插入的数据。它工作正常。但是我写的获取表中所有数据的测试用例返回一个空结果集，即使表中有一些数据也是如此。我可以使用MySQL控制台查询表，它同时显示表中的数据。我做错了什么？请帮忙。

用户存储库类中的代码

@Repository
public class UserRepository {

    @Autowired
    private JdbcTemplate jdbcTemplate;

    @Transactional(readOnly = true)
    public List<User> getAllUsers() {
        return jdbcTemplate.query("SELECT * FROM db_users", new UserRowMapper());
    }

    @Transactional(readOnly = true)
    public User getUserByUsername(String username) {
        return jdbcTemplate.queryForObject("SELECT * FROM db_users WHERE username=?", new Object[]{username},
                new UserRowMapper());
    }

    public User addNewUser(final User user) {
        final String query = "INSERT INTO db_users(username,email,first_name,Last_name,password) values(?,?,?,?,?)";

        jdbcTemplate.update(new PreparedStatementCreator() {
            @Override
            public PreparedStatement createPreparedStatement(Connection connection) throws SQLException {
                PreparedStatement preparedStatement = connection.prepareStatement(query);
                preparedStatement.setString(1, user.getUsername());
                preparedStatement.setString(2, user.getEmail());
                preparedStatement.setString(3, user.getFirstName());
                preparedStatement.setString(4, user.getLastName());
                preparedStatement.setString(5, user.getPassword());

                return preparedStatement;
            }
        });

        return user;
    }
}

UserRowMapper类

class UserRowMapper implements RowMapper<User> {

        @Override
        public User mapRow(ResultSet resultSet, int rowNum) throws SQLException {
            User user = new User(resultSet.getString("username"), resultSet.getString("email"),
                    resultSet.getString("first_name"), resultSet.getString("last_name"), resultSet.getString("password"));

            return user;
        }
    }

测试用例中的代码;

@RunWith(SpringRunner.class)
@SpringBootTest
public class UserRepositoryTests {
    @Autowired
    private UserRepository userRepository;

    @Test
    public void createUserTest() {
        User user = new User("testuser", "test@email.com", "Firstname", "Lastname", "password");
        User savedUser = userRepository.addNewUser(user);
    }

    @Test
    public void findUserByUsernameTest() {
        User user = userRepository.getUserByUsername("testuser");
        assertNotNull(user);
    }

    @Test
    public void getAllUsersTest() {
        List<User> users = userRepository.getAllUsers();
        assertNotNull(users);
        assertTrue(!users.isEmpty());
    }

我得到的是，

getAllUsersTest(com.sol16.core.UserTests.UserRepositoryTest)  Time elapsed: 0.026 sec  <<< FAILURE!
junit.framework.AssertionFailedError: null
    at junit.framework.Assert.fail(Assert.java:55)
    at junit.framework.Assert.assertTrue(Assert.java:22)
    at junit.framework.Assert.assertTrue(Assert.java:31)
    at junit.framework.TestCase.assertTrue(TestCase.java:201)
    at com.sol16.core.UserTests.UserRepositoryTest.getAllUsersTest(UserRepositoryTest.java:52)

JdbcTemplate查询返回null set - Spring boot，MySQL

0 个答案: