SpringBoot整合StringData JPA

SpringBoot整合StringData JPA

目录

• SpringBoot整合StringData JPA
  • • application.yml
    • User.class
    • UserRepository.java
    • UserController

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<User, Integer> {
}

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
 */
@RestController
public class UserController {
    private final UserRepository userRepository;

    @Autowired
    public UserController(UserRepository userRepository) {
        this.userRepository = userRepository;
    }

    @RequestMapping("getUser")
    public List<User> 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