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package com.hph.springboot.repository;

import com.hph.springboot.entity.User;import org.springframework.data.jpa.repository.JpaRepository;

//继承JpaRepository来完成对数据库的操作public interface UserRepository extends JpaRepository<User,Integer> {}

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package com.hph.springboot.entity;

import javax.persistence.*;

//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;    }}

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package com.hph.springboot.controller;

import com.hph.springboot.entity.User;import com.hph.springboot.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;

@RestControllerpublic 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;    }}

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spring:  datasource:    url: jdbc:mysql://192.168.1.110/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