一、编写一个实体类(bean)和数据表进行映射,并且配置好映射关系
/**
* @author hq.zheng
* @create 2019-03-14-下午 4:28
*/
//使用JPA注解配置映射关系
@Entity//告诉JPA这是一个实体类(和数据表映射的类)
@Table(name="tbl_user")//指定和哪个数据表对应;如果不填默认表名是类名小写user
public class User {
@Id//这是一个主键
@GeneratedValue(strategy = GenerationType.IDENTITY)//自增主键
private Integer id;
@Column(name = "last_name",length = 50)//这是和数据表对应的一个列
private String lastName;
@Column//省略默认列名就是属性名
private String email;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
二、编写一个Dao接口来操作实体类对应的数据表(Repository)
/**
* @author hq.zheng
* @create 2019-03-14-下午 4:43
*/
//继承JpaRepository来完成对数据库的CRUD操作
public interface UserRepository extends JpaRepository<User,Integer> {
}
三、全局配置文件中配置基本的配置JpaProperties
spring:
datasource:
url: jdbc:mysql://192.168.43.118:3307/jpa
username: root
password: 123456
driver-class-name: com.mysql.jdbc.Driver
jpa:
hibernate:
# 更新或创建数据表结构
ddl-auto: update
# 控制台显示SQL
show-sql: true
四、编写controller测试接口是否整合成功
/**
* @author hq.zheng
* @create 2019-03-14-下午 4:57
*/
@RestController
public class UserController {
@Autowired
UserRepository userRepository;
//根据id查找
@GetMapping("/user/{id}")
public User getUser(@PathVariable("id") Integer id){
User user = userRepository.findOne(id);
return user;
}
//新增
@GetMapping("/user")
public User insertUser(User user){
User user1 = userRepository.save(user);
return user1;
}
}