springboot整合JPA访问Mysql的实现方法

 <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-WEB</artifactId>
        </dependency>

        <dependency>
            <groupId>Mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>

spring:
  application:
    name: auth-server
  datasource:
    url: jdbc:mysql://127.0.0.1:3306/spring_cloud?characterEncoding=UTF-8&useUnicode=true&useSSL=false&tinyInt1isBit=false&allowPublicKeyRetrieval=true&serverTimezone=Asia/Shanghai&autoReconnect=true&failOverReadOnly=false
    username: root
    passWord: 123456
    hikari:
      connection-timeout: 30000
      idle-timeout: 600000
      max-lifetime: 1800000
      maximum-pool-size: 9


  jpa:
    properties:
      hibernate:
        hbm2ddl:
          auto: create-drop

package com.cxh.jpa.controller;


import com.cxh.jpa.entity.User;
import com.cxh.jpa.service.IUserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.util.List;

@RestController
public class UserController {

    @Autowired
    private IUserService userService;

    @GetMapping("/findAll")
    public List<User> findAll(){
        return userService.findAll();
    }

    @GetMapping("/findByName")
    public User findByName(String name){
        return userService.findByName(name);
    }

    @PostMapping("/add")
    public String add(User user){
        return userService.add(user);
    }

    @PutMapping("/edit")
    public String edit(User user){
        return userService.edit(user);
    }

    @DeleteMapping("/deleteById")
    public String deleteById(Long id){
        return userService.deleteById(id);
    }

}

package com.cxh.jpa.service.impl;

import com.cxh.jpa.entity.User;
import com.cxh.jpa.repository.UserRepository;
import com.cxh.jpa.service.IUserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;


@Service
public class UserServiceImpl implements IUserService {

    @Autowired
    private UserRepository userRepository;

    @Override
    public List<User> findAll() {
        return userRepository.findAll();
    }

    @Override
    public User findByName(String name) {
        return userRepository.findByName(name);
    }

    @Override
    public String add(User user) {
        userRepository.save(user);
        return "添加成功";
    }

    @Override
    public String edit(User user) {
        userRepository.save(user);
        return "修改成功";
    }

    @Override
    public String deleteById(Long id) {
        userRepository.deleteById(id);
        return "删除成功";
    }
}

package com.cxh.jpa.repository;


import com.cxh.jpa.entity.User;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Query;
import org.springframework.data.repository.query.Param;

public interface UserRepository extends JpaRepository<User, Long> {

    User findByName(String name);


    @Query("from User u where u.name=:name")
    User findUser(@Param("name") String name);

}

package com.cxh.jpa.entity;


import lombok.Data;
import lombok.NoArgsConstructor;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;

@Entity
@Data
@NoArgsConstructor
public class User {

    @Id
    @GeneratedValue
    private Long id;

    private String name;
    private Integer age;


}