SpringBoot入门：（2）jpa方式操作数据库

导入jar ，在pom.xml中添加依赖:

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

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

在appilication.yml中添加数据库配置：

spring:
  profiles:
    active: dev

  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/dbvc?useUnicode=true&characterEncoding=utf8&characterSetResults=utf8
    username: root
    password: 123

  jpa:
    hibernate:
      ddl-auto: create
    show-sql: true

注：ddl_auto: create 代表在数据库创建表，update 代表更新，首次启动需要create ,如果你想通过hibernate 注解的方式创建数据库的表的话，之后需要改为 update.
spring:
profiles:
active: 用来表示多配置文件时，选择哪一个配置文件

创建一个实体

package com.vc.im.model.entity;

import java.util.Date;

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

@Entity
public class ThirdPartyUser
    @Id
    @GeneratedValue
    private Integer id;

    private String name;

    private String openid;

    private String accessToken;

    private String refreshToken;

    private String mediaType;

    private Date createTime;

    private Date updateTime;

    public Integer getId()
    {
        return id;
    }

    public void setId(Integer id)
    {
        this.id = id;
    }

    public String getName()
    {
        return name;
    }

    public void setName(String name)
    {
        this.name = name == null ? null : name.trim();
    }

    public String getOpenid()
    {
        return openid;
    }

    public void setOpenid(String openid)
    {
        this.openid = openid == null ? null : openid.trim();
    }

    public String getAccessToken()
    {
        return accessToken;
    }

    public void setAccessToken(String accessToken)
    {
        this.accessToken = accessToken == null ? null : accessToken.trim();
    }

    public String getRefreshToken()
    {
        return refreshToken;
    }

    public void setRefreshToken(String refreshToken)
    {
        this.refreshToken = refreshToken == null ? null : refreshToken.trim();
    }

    public String getMediaType()
    {
        return mediaType;
    }

    public void setMediaType(String mediaType)
    {
        this.mediaType = mediaType == null ? null : mediaType.trim();
    }

    public Date getCreateTime()
    {
        return createTime;
    }

    public void setCreateTime(Date createTime)
    {
        this.createTime = createTime;
    }

    public Date getUpdateTime()
    {
        return updateTime;
    }

    public void setUpdateTime(Date updateTime)
    {
        this.updateTime = updateTime;
    }
}

创建Dao接口, springboot 将接口类会自动注解到spring容器中，不需要我吗做任何配置，只需要继承JpaRepository 即可

package com.vc.im.dao;

import org.springframework.data.jpa.repository.JpaRepository;

import com.vc.im.model.entity.ThirdPartyUser;

创建一个service层,接口和实现类.这里省略，就是把Dao 封装一下。在实现类上 加上 @Service 注解

如果需要事务的话，在service层加@Transaction注解即可。
……

Controller 层

package com.vc.im.model.controller;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;

import com.vc.im.model.entity.ThirdPartyUser;
import com.vc.im.model.service.IThirdPartyUserService;

@RestController
@RequestMapping("/")
public class ThirdPartyUserController
{
    @Autowired
    private IThirdPartyUserService thirdPartyUserService;

    /**
     * 
     * @return
     */
    @RequestMapping("getList")
    @ResponseBody
    public List<ThirdPartyUser> getList()
    {
        System.out.println("11111111111");
        List<ThirdPartyUser> thirdPartyUsrtList = thirdPartyUserService.findAll();
        return thirdPartyUsrtList;
    }

    /**
     * 
     * @return
     */
    @RequestMapping(value = "/add", method = RequestMethod.POST)
    public ThirdPartyUser add(ThirdPartyUser user)
    {
        return thirdPartyUserService.save(user);

启动类

package com.vc;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
@SpringBootApplication
public class TestController  {

    @ResponseBody
    @RequestMapping(value = "/")
    String home() {   
        return "Hello World!";
    }

    public static void main(String[] args) throws Exception {
        SpringApplication.run(TestController.class, args);

参考:​​2小时学会springboot​​