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
4000
.vc.im.model.entity.ThirdPartyUser;

public interface ThirdPartyUserDao extends JpaRepository<ThirdPartyUser, Integer>
{

}

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