1、引入依赖
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
2、yml配置
spring:
datasource:
url: jdbc:mysql://192.168.106.130:3305/jpa
username: root
password: 123456
driver-class-name: com.mysql.jdbc.Driver
jpa:
hibernate:
#更新或者创建数据表结构
ddl-auto: update
#控制台显示SQL
show-sql: true
3、编写实体类和数据表进行映射,并且配置好映射关系
/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") //@Table来指定和哪个数据表对应;如果省略默认表名就是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;
}
}
4、编写Dao接口来操作实体类对应的数据表(Repository)
//继承JpaRepository来完成对数据库的操作
public interface UserRepository extends JpaRepository<User,Integer> {
}
测试:
@RestController
public class UserController {
@Autowired
UserRepository userRepository;
@GetMapping("/user/{id}")
public User getUser(@PathVariable("id") Integer id){
User user = userRepository.findOne(id);
return user;
}
@GetMapping("/user")
public User insertUser(User user){
User save = userRepository.save(user);
return save;
}
}