Spring对Jdbc的封装——JdbcTemplate的使用

 链接：https://pan.baidu.com/s/15luDElW4oeEaP0nvEQ_40w 

提取码：i2r1

JdbcTemplate是Spring对JDBC的封装，目的是使JDBC更加易于使用。JdbcTemplate是Spring的一部分。

接下来，使用JdbcTemplate进行增删改查（CRUD）的操作

写一个pojo类（不是重点）

 1 package top.bigking.pojo;
 2 
 3 import java.util.Date;
 4 
 5 public class User {
 6     private Integer id;
 7     private String username;
 8     private String password;
 9     private Date birthday;
10     private Integer age;
11 
12     public User() {
13     }
14 
15     public User(Integer id, String username, String password, Date birthday, Integer age) {
16         this.id = id;
17         this.username = username;
18         this.password = password;
19         this.birthday = birthday;
20         this.age = age;
21     }
22 
23     public User(String username, String password, Date birthday, Integer age) {
24         this.username = username;
25         this.password = password;
26         this.birthday = birthday;
27         this.age = age;
28     }
29 
30     public Integer getId() {
31         return id;
32     }
33 
34     public void setId(Integer id) {
35         this.id = id;
36     }
37 
38     public String getUsername() {
39         return username;
40     }
41 
42     public void setUsername(String username) {
43         this.username = username;
44     }
45 
46     public String getPassword() {
47         return password;
48     }
49 
50     public void setPassword(String password) {
51         this.password = password;
52     }
53 
54     public Date getBirthday() {
55         return birthday;
56     }
57 
58     public void setBirthday(Date birthday) {
59         this.birthday = birthday;
60     }
61 
62     public Integer getAge() {
63         return age;
64     }
65 
66     public void setAge(Integer age) {
67         this.age = age;
68     }
69 
70     @Override
71     public String toString() {
72         return "User{" +
73                 "id=" + id +
74                 ", username='" + username + '\'' +
75                 ", password='" + password + '\'' +
76                 ", birthday=" + birthday +
77                 ", age=" + age +
78                 '}';
79     }
80 }

View Code

再写一个接口

 1 package top.bigking.dao;
 2 
 3 import top.bigking.pojo.User;
 4 
 5 import java.util.List;
 6 
 7 public interface UserDao {
 8     public int insertUser(User user);
 9     public int deleteById(Integer id);
10     public int updateUser(User user);
11     public List<User> queryUser();
12     public User selectUserById(Integer id);
13 }

接下来对接口进行实现：

 1 package top.bigking.dao.impl;
 2 
 3 import org.springframework.beans.factory.annotation.Autowired;
 4 import org.springframework.jdbc.core.BeanPropertyRowMapper;
 5 import org.springframework.jdbc.core.JdbcTemplate;
 6 import org.springframework.stereotype.Repository;
 7 import top.bigking.dao.UserDao;
 8 import top.bigking.pojo.User;
 9 
10 import java.util.List;
11 
12 
13 @Repository("userDao")
14 public class UserDaoImpl implements UserDao {
15     @Autowired
16     private JdbcTemplate jdbcTemplate;
17 
18     @Override
19     public int insertUser(User user) {
20         String sql = "insert into t_user(user_name, password, birthday, age) values(?, ?, ?, ?)";
21         return jdbcTemplate.update(sql, user.getUsername(), user.getPassword(), user.getBirthday(), user.getAge());
22     }
23 
24     @Override
25     public int deleteById(Integer id) {
26         String sql = "delete from t_user where id = ?";
27         return jdbcTemplate.update(sql, id);
28     }
29 
30     @Override
31     public int updateUser(User user) {
32         String sql = "update t_user set user_name = ?, password = ?, birthday = ?, age = ?";
33         return jdbcTemplate.update(sql, user.getUsername(), user.getPassword(), user.getBirthday(), user.getAge());
34     }
35 
36     @Override
37     public List<User> queryUser() {
38         String sql = "select * from t_user";
39         return jdbcTemplate.query(sql, new BeanPropertyRowMapper<>(User.class));
40     }
41 
42     @Override
43     public User selectUserById(Integer id) {
44         String sql = "select * from t_user where id = ?";
45         return jdbcTemplate.queryForObject(sql, new BeanPropertyRowMapper<>(User.class), id);
46     }
47 }

接下来使用单元测试一个一个测试：

 1 package top.bigking.test;
 2 
 3 import org.junit.Before;
 4 import org.junit.Test;
 5 import org.springframework.context.ApplicationContext;
 6 import org.springframework.context.support.ClassPathXmlApplicationContext;
 7 import top.bigking.dao.UserDao;
 8 import top.bigking.pojo.User;
 9 
10 import java.util.Date;
11 import java.util.List;
12 
13 public class TestJdbc {
14     private UserDao userDao;
15 
16     @Before
17     public void connect(){
18         ApplicationContext applicationContext = new ClassPathXmlApplicationContext("application.xml");
19         userDao = (UserDao) applicationContext.getBean("userDao");
20     }
21     @Test
22     public void testConnect(){
23         User user = userDao.selectUserById(6);
24         System.out.println(user);
25     }
26     @Test
27     public void testInsertUser(){
28         User user = new User("ABKing", "123456", new Date(), 20);
29         System.out.println(userDao.insertUser(user));
30     }
31 
32     @Test
33     public void testDeleteUser(){
34         System.out.println(userDao.deleteById(6));
35     }
36     @Test
37     public void testUpdateUser(){
38         User user = new User(36, "ABKing", "666666", new Date(), 20);
39         System.out.println(userDao.updateUser(user));
40     }
41     @Test
42     public void testQuery(){
43         List<User> userList = userDao.queryUser();
44         for(User user : userList){
45             System.out.println(user);
46         }
47     }
48 }