springboot系列教程（五）——整合jpa

Myth丶恋晨 2022-06-03 07:46 282阅读 0赞

## **整合jpa** ##

**pom**

<dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-data-jpa</artifactId>
            </dependency>
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <scope>runtime</scope>
            </dependency>

**配置文件**

spring:
      datasource:
        driver-class-name: com.mysql.jdbc.Driver
        url: jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf8&characterSetResults=utf8
        username: root
        password: 123456
    
      jpa:
        hibernate:
          ddl-auto: create  # 第一次建表create 后面用update
        show-sql: true

**新建model类**

package com.example.demo.model;
    
    import javax.persistence.Entity;
    import javax.persistence.GeneratedValue;
    import javax.persistence.Id;
    
    /** * @author :小虎 * @date :2017/12/22 */
    
    @Entity
    public class User { 
        @Id
        @GeneratedValue
        private int id ;
        private String name ;
        private double money;
    
        public int getId() {
            return id;
        }
    
        public void setId(int id) {
            this.id = id;
        }
    
        public String getName() {
            return name;
        }
    
        public void setName(String name) {
            this.name = name;
        }
    
        public double getMoney() {
            return money;
        }
    
        public void setMoney(double money) {
            this.money = money;
        }
    
        @Override
        public String toString() {
            return "User{" +
                    "id=" + id +
                    ", name='" + name + '\'' +
                    ", money=" + money +
                    '}';
        }
    }

**新建UserDao**

package com.example.demo.dao;
    
    import com.example.demo.model.User;
    import org.springframework.data.jpa.repository.JpaRepository;
    
    /** * @author :小虎 * @date :2017/12/22 */
    
    
    public interface UserDao extends JpaRepository<User,Integer> { 
    }

**新建UserController**

package com.example.demo.web;
    
    import com.example.demo.dao.UserDao;
    import com.example.demo.model.User;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.web.bind.annotation.*;
    
    import java.util.List;
    
    /** * @author :小虎 * @date :2017/12/22 */
    
    
    @RestController
    @RequestMapping("/user")
    public class UserController { 
    
        @Autowired
        UserDao userDao;
    
        @RequestMapping(value = "/list", method = RequestMethod.GET)
        public List<User> getUsers() {
            return userDao.findAll();
        }
    
        @RequestMapping(value = "/{id}", method = RequestMethod.GET)
        public User getUserDaoById(@PathVariable("id") int id) {
            return userDao.findOne(id);
        }
    
        @RequestMapping(value = "/{id}", method = RequestMethod.PUT)
        public String updateUserDao(@PathVariable("id") int id, @RequestParam(value = "name", required = true) String name,
                                    @RequestParam(value = "money", required = true) double money) {
            User user = new User();
            user.setMoney(money);
            user.setName(name);
            user.setId(id);
            User user1 = userDao.saveAndFlush(user);
            return user1.toString();
        }
    
        @RequestMapping(value = "", method = RequestMethod.POST)
        public String postUserDao(@RequestParam(value = "name") String name,
                                  @RequestParam(value = "money") double money) {
            User user = new User();
            user.setMoney(money);
            user.setName(name);
            User UserDao1 = userDao.save(user);
            return UserDao1.toString();
    
        }
    
    
    }

## **源码地址** ##

> [https://github.com/itmybaby/springboot/tree/master/study5][https_github.com_itmybaby_springboot_tree_master_study5]

[https_github.com_itmybaby_springboot_tree_master_study5]: https://github.com/itmybaby/springboot/tree/master/study5