Sprindata JPA

 

SpringBootData JPA introduction
  SpringData: SpringData fact that Spring provides a framework for the operation of the data. While only a SpringData JPA SpringData under standard operating data frame based JPA module.
  SpringData JPA: JPA-based standard operating data. Simplified operation code persistence layer. Only you need to write the interface can be.

 

SpringBoot JPA integration SpringData
 . 1, introduced maven dependent
 plus JPA dependence of the basis of the original SprigBoot in dependence maven

 2. application.properties add configuration file

 

 

 

 

 

 

 3. The entity class

import javax.persistence.*;

@Entity
@Table(name="t_users")
public class Users {

 @Id //主键id
 @GeneratedValue(strategy=GenerationType.IDENTITY)//主键生成策略
 @Column(name="id")//数据库字段名
 private Integer id;
 
 @Column(name="name")
 private String name;
 
 @Column(name="age")
 private Integer age;
 
 @Column(name="address")
 private String address;

 @ManyToOne(cascade = CascadeType.PERSIST) //表示多方
 @JoinColumn(name ="role_id") //维护一个外键，外键在Users一侧
 private Roles roles;

 

4.编写Dao接口

import org.springframework.data.jpa.repository.JpaRepository;

import com.bjsxt.pojo.Users;
/**
 * 参数一 T :当前需要映射的实体
 * 参数二 ID :当前映射的实体中的OID的类型
 *
 */
public interface UsersRepository extends JpaRepository<Users,Integer> {

}

 

 

5.在pom文件中添加测试启动器的坐标

 

测试测试

 

 

 

三、SpringBoot JPA提供的核心接口
 
 1、Repository接口
 2、CrudRepository接口
 3、PagingAndSortingRepository接口
 4、JpaRepository接口
 5、JPASpecificationExecutor接口
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原文链接：https://blog.csdn.net/qq_39086296/article/details/90485645