目录

SpringBoot整合StringData JPA

application.yml

spring:  datasource:    url: jdbc:mysql://192.168.0.169:3306/jpa    username: root    password: xiaoyan    type: com.alibaba.druid.pool.DruidDataSource    driver-class-name: com.mysql.cj.jdbc.Driver  jpa:    hibernate:#      如果表不存在或已更新,则自动创建/更新      ddl-auto: update#      显示sql语句    show-sql: true

User.class

package kim.nzxy.demo.pojo;import javax.persistence.*;/** * @Author: Xiaoyan * @Date: 2019/3/27 14:31 */// 表示这是一个实体@Entity//对应的表明@Table(name = "user")public class User {    //表示主键    @Id    // 自增长    @GeneratedValue(strategy = GenerationType.IDENTITY)    Integer id;    // 这里什么也没写,也没问题,而且自动创建的字段为user_name    String userName;    //这是和数据表对应的一个列,默认是属性名,可以不写,但是默认长度是255    @Column(name = "password", length = 50)    String password;}

UserRepository.java

package kim.nzxy.demo.repository;import kim.nzxy.demo.pojo.User;import org.springframework.data.jpa.repository.JpaRepository;/** * JpaRepository
       <类, 主键类型>
         * @Author: Xiaoyan * @Date: 2019/3/27 15:05 */public interface UserRepository extends JpaRepository
        
          {}
        
       

UserController

package kim.nzxy.demo.controller;import kim.nzxy.demo.pojo.User;import kim.nzxy.demo.repository.UserRepository;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;import java.util.List;/** * @Author: Xiaoyan * @Date: 2019/3/27 15:11 */@RestControllerpublic class UserController {    private final UserRepository userRepository;    @Autowired    public UserController(UserRepository userRepository) {        this.userRepository = userRepository;    }    @RequestMapping("getUser")    public List
       
         getUser() {        return userRepository.findAll();    }}
       

只要将这些文件放对了地方,启动起来,基本上就算是入门了,毕竟这是一个相对来说很简单的框架了,如果SpringBoot已经入门了,这个基本上看一遍就懂了,其具体语法还请去官网大佬博客去看,我也只是为了知道它是个什么东西,我更喜欢mybatis