Spring中JdbcTemplate中使用RowMapper

• spring

1. package com.cxl.demo.dao;
3. import java.sql.ResultSet;
4. import java.sql.SQLException;
5. import java.util.List;
6. import org.springframework.jdbc.core.JdbcTemplate;
7. import org.springframework.jdbc.core.RowMapper;
8. import com.cxl.demo.entity.User;
9. public class UserDaoImpl {
10. private JdbcTemplate jdbcTemplate;
12. public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
13. this.jdbcTemplate = jdbcTemplate;
14. }
16. public List<User> getUserByName(String username) {
17. String sql = "select * from t_user where username = ?";
18. Object[] params = new Object[] { username };
19. List<User> users = null;
20. /**
21. * 使用接口實現類
22. */
23. users = jdbcTemplate.query(sql, params, new UserRowMapper());
24. /**
25. * 使用匿名內部類
26. * 如果UserRowMapper類只使用一次，單獨為其創建一個類多余，可以使用匿名類
27. * 省略了書寫一個實現類
28. */
29. users = jdbcTemplate.query(sql, params,
30. new RowMapper<User>() {
31. @Override
32. public User mapRow(ResultSet rs, int rowNum) throws SQLException {
33. User user = new User();
34. user.setId(rs.getInt("id"));
35. user.setUsername(rs.getString("username"));
36. user.setPassword(rs.getString("password"));
37. return user;
38. }
39. });
40. return (users != null && users.size() > 0) ? users : null;
41. }
43. public class UserRowMapper implements RowMapper<User> {
45. @Override
46. public User mapRow(ResultSet rs, int rowNum) throws SQLException {
47. User user = new User();
48. user.setId(rs.getInt("id"));
49. user.setUsername(rs.getString("username"));
50. user.setPassword(rs.getString("password"));
51. return user;
52. }
54. }
55. }

Spring中JdbcTemplate中使用RowMapper