SpringBoot整合Mybatis (四) 多对多
SpringBoot整合Mybatis
四、多对多实现
目标：根据id查询用户选择的运营商
1. 构建项目
使用上一章内容
2. 创建数据库
1). user表：
CREATE TABLE user(
id INT(10) NOT NULL AUTO_INCREMENT COMMENT '编号',
name VARCHAR(50) NOT NULL COMMENT '用户名',
PRIMARY KEY(id)
)ENGINE=INNODB AUTO_INCREMENT=0 DEFAULT CHARSET=utf8;2). combo表：
CREATE TABLE combo(
id INT(10) NOT NULL AUTO_INCREMENT COMMENT '编号',
name VARCHAR(50) NOT NULL COMMENT '运营商名称',
PRIMARY KEY(id)
)ENGINE=INNODB AUTO_INCREMENT=0 DEFAULT CHARSET=utf8;3). user_combo表：
CREATE TABLE user_combo(
uid INT(10) NULL COMMENT '用户编号',
cid INT(10) NULL COMMENT '运营商编号',
price INT(10) NULL COMMENT '价格'
)ENGINE=INNODB AUTO_INCREMENT=0 DEFAULT CHARSET=utf8;3. 编写代码
1). 实体类Combo
位于entity包
/**
* @author Ray
* @date 2018/7/7 0007
* 运营商实体类
*/
public class Combo {
private int id;
private String name;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public String toString() {
return "Combo{" +
"id=" + id +
", name='" + name + '\'' +
'}';
}
}2). 实体类UserCombo
位于entity包
/**
* @author Ray
* @date 2018/7/7 0007
* 用户拥有运营商实体
*/
public class UserCombo {
private int uid;
private int cid;
private int price;
private List combos;
public List getCombos() {
return combos;
}
public void setCombos(List combos) {
this.combos = combos;
}
public int getUid() {
return uid;
}
public void setUid(int uid) {
this.uid = uid;
}
public int getCid() {
return cid;
}
public void setCid(int cid) {
this.cid = cid;
}
public int getPrice() {
return price;
}
public void setPrice(int price) {
this.price = price;
}
@Override
public String toString() {
return "UserCombo{" +
"uid=" + uid +
", cid=" + cid +
", price=" + price +
", combos=" + combos +
'}';
}
} 3). 实体类User
位于entity包，添加UserCombo集合，添加对应的setter、getter
/**
* @author Ray
* @date 2018/7/7 0007
* 用户实体类
*/
public class User {
/**
* 编号（主键）
*/
private int id;
/**
* 用户名
*/
private String name;
/**
* 新增Phone集合
*/
private List phones;
/**
* 新增UserCombo集合
*/
private List userCombos;
public List getUserCombos() {
return userCombos;
}
public void setUserCombos(List userCombos) {
this.userCombos = userCombos;
}
public List getPhones() {
return phones;
}
public void setPhones(List phones) {
this.phones = phones;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public User() {
}
public User(String name) {
this.name = name;
}
@Override
public String toString() {
return "User{" +
"id=" + id +
", name='" + name + '\'' +
'}';
}
} 4). 数据操作类UserMapper
位于mapper包，添加查询方法selectComboById(Integer id)
/**
* @author Ray
* @date 2018/7/7 0007
* 数据操作层
*/
public interface UserMapper {
/**
* 根据id获取用户信息
*/
public User selectById(Integer id);
/**
* 查询所有用户信息
*/
public List list();
/**
* 新增用户信息
*/
public int insert(User user);
/**
* 修改用户信息
*/
public int update(User user);
/**
* 删除用户信息
*/
public int delete(Integer id);
/**
* 根据id查询用户的所有电话信息
*/
public User selectPhoneById(Integer id);
/**
* 根据id查询用户选择的运营商
*/
public User selectComboById(Integer id);
} 5). UserMapper类映射UserMapper.xml
INSERT INTO
user(name)
VALUES
(#{name})
UPDATE
user
SET
name=#{name}
WHERE
id=#{id}
DELETE
FROM
user
WHERE
id=#{id}
6). 数据控制类UserController
位于controller包
/**
* @author Ray
* @date 2018/7/7 0007
* 数据控制层
*/
@RestController
public class UserController {
@Autowired
private UserMapper userMapper;
/**
* 根据id获取用户信息
* localhost:8080/user/2
*/
@GetMapping("/user/{id}")
public User selectById(@PathVariable("id")Integer id){
User user = userMapper.selectById(id);
return user;
}
/**
* 查询所有用户信息
* localhost:8080/users
*/
@GetMapping("/users")
public List list(){
List users = userMapper.list();
return users;
}
/**
* 新增用户信息
* localhost:8080/user?name=Ray1
*/
@PostMapping("/user")
public String insert(User user){
int result = userMapper.insert(user);
if(result == 1){
return "success";
}
return "fail";
}
/**
* 修改用户信息
* localhost:8080/user/2?name=Ray22
*/
@PutMapping("/user/{id}")
public String update(User user, @PathVariable("id") Integer id){
int result = userMapper.update(user);
if(result == 1){
return "success";
}
return "fail";
}
/**
* 删除用户信息
* localhost:8080/user/8
*/
@DeleteMapping("/user/{id}")
public String delete(@PathVariable("id") Integer id){
int result = userMapper.delete(id);
if(result == 1){
return "success";
}
return "fail";
}
/**
* 根据id查询用户的所有电话信息(一对多)
* localhost:8080/user/phone/1
*/
@GetMapping("/user/phone/{id}")
public User selectPhoneById(@PathVariable("id") Integer id){
User user = userMapper.selectPhoneById(id);
return user;
}
/**
* 根据id查询用户选择的运营商（多对多）
* localhost:8080/user/combo/1
*/
@GetMapping("/user/combo/{id}")
public User selectComboById(@PathVariable("id") Integer id){
User user = userMapper.selectComboById(id);
return user;
}
} 4. 测试
根据id查询用户选择的运营商-GET
