JPA顾名思义就是Java Persistence API的意思，是JDK 5.0注解或XML描述对象－关系表的映射关系，并将运行期的实体对象持久化到数据库中。
依赖
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-jdbc</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-jpa</artifactId> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <scope>runtime</scope> </dependency>
application.yml
spring.jpa.hibernate.ddl-auto=update
spring.jpa.show-sql=true
spring.jpa.database
spring: datasource: driver-class-name: com.mysql.cj.jdbc.Driver url: jdbc:mysql://localhost:3306/spring_boot?serverTimezone=GMT%2B8 username: root password: root jpa: hibernate: ddl-auto: update show-sql: true database: mysql
POJO
import lombok.Data;
import javax.persistence.*;
@Entity
@Table(name = "jpa_user")
@Data
public class User {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Integer id;
@Column(name = "jpa_username",length = 40)
private String username;
@Column(name = "jpa_password")
private String password;
}
Repository
JpaRepository的继承关系
所以继承JpaRepository
package com.live.repository;
import com.live.model.User;
import org.springframework.data.jpa.repository.JpaRepository;
public interface UserRepository extends JpaRepository<User,Integer> {
}
Controller（测试）
@Autowired @Autowired UserRepository userRepository;
package com.live.controller;
import com.live.model.User;
import com.live.repository.UserRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
import java.util.List;
import java.util.Optional;
@RestController
public class UserJPAController {
@Autowired
UserRepository userRepository;
@GetMapping("/findAll")
public List<User> findAll() {
return userRepository.findAll();
}
@GetMapping("/findOne/{id}")
public Optional<User> findOne(@PathVariable(value = "id") Integer id) {
return userRepository.findById(id);
}
@GetMapping("/insert")
public User insertOne(User user) {
return userRepository.save(user);
}
}
测试
注意：
查询所有
插入
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