springboot实战笔记(三)----springboot整合mybatis

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/qq_33223299/article/details/86698949

一 前言

 本篇记录的是springboot整合mybatis框架，这里用的数据库是mysql，工具spring-tool，用的版本是spring boot 1.5

二 项目搭建

通过spring-tool工具新建项目，如下图所示

新建完成后的项目，根据自己的习惯命名分层建立控制层，业务层，数据处理层以及实体类的包名，如下图所示

pom.xml依赖::

<dependencies>
		<dependency>
			<groupId>org.mybatis.spring.boot</groupId>
			<artifactId>mybatis-spring-boot-starter</artifactId>
			<version>1.3.0</version>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<scope>runtime</scope>
		</dependency>
		<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>druid</artifactId>
			<version>1.0.29</version>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
	</dependencies>

application.properties配置:

#mysql数据库配置
spring.datasource.url=jdbc:mysql://localhost:3306/springbootMybatis
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
#d端口号设置
server.port=8023
#显示数据库执行语句
spring.jpa.show-sql=true
#启用shutdown 
endpoints.shutdown.enabled=true 
#禁用密码验证 
endpoints.shutdown.sensitive=false

三 代码模拟

用代码简单的模拟一个用户余额的功能，简单的建立一张表

DROP TABLE IF EXISTS `account`;
CREATE TABLE `account` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(255) DEFAULT NULL,
  `money` double DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8;

通过mybatis自动生成代码工具，生成对应的实体类与dao层

如下:

Account:

package com.chp.model;

public class Account {
    private Integer id;

    private String name;

    private Double money;

    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 Double getMoney() {
        return money;
    }

    public void setMoney(Double money) {
        this.money = money;
    }
}

Mapper:

package com.chp.dao;

import com.chp.model.Account;
import com.chp.model.AccountExample;
import java.util.List;

import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
@Mapper
public interface AccountMapper {
    int countByExample(AccountExample example);

    int deleteByExample(AccountExample example);

    int deleteByPrimaryKey(Integer id);

    int insert(Account record);

    int insertSelective(Account record);

    List<Account> selectByExample(AccountExample example);

    Account selectByPrimaryKey(Integer id);

    int updateByExampleSelective(@Param("record") Account record, @Param("example") AccountExample example);

    int updateByExample(@Param("record") Account record, @Param("example") AccountExample example);

    int updateByPrimaryKeySelective(Account record);

    int updateByPrimaryKey(Account record);
}

新建自己的业务层接口与其实现类：

service：

public interface AccountService {

	List<Account> selectAccount() throws Exception;

	int updateAccount(int id) throws Exception;

	int deleteAccount(int id) throws Exception;

}

serviceImpl：

package com.chp.service;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import com.chp.dao.AccountMapper;
import com.chp.model.Account;

@Service
public class AccountServiceImpl implements AccountService {

	@Autowired
	private AccountMapper accountMapper;

	/**
	 * 模拟查询信息业务
	 */
	@Override
	public List<Account> selectAccount() throws Exception {
		return accountMapper.selectByExample(null);
	}

	/**
	 * 模拟更改信息业务
	 */
	@Override
	@Transactional
	public int updateAccount(int id) throws Exception {
		Account account = new Account();
		account.setMoney((double) 200);
		account.setName("张三丰");
		account.setId(id);
		return accountMapper.updateByPrimaryKeySelective(account);
	}

	/**
	 * 模拟删除信息业务
	 */
	@Override
	public int deleteAccount(int id) throws Exception {
		return accountMapper.deleteByPrimaryKey(id);
	}

}

控制层mvc层：

package com.chp.controller;

import org.springframework.aop.ThrowsAdvice;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import com.chp.model.Account;
import com.chp.service.AccountService;

import java.util.ArrayList;
import java.util.List;

import javax.annotation.Resource;

@RestController
@RequestMapping("/account")
public class AccountController {

	@Resource
	private AccountService accountService;

	@RequestMapping(value = "/list", method = RequestMethod.GET)
	public List<Account> getAccounts() throws Exception {
		List<Account> list = accountService.selectAccount();
		return list;
	}

	@RequestMapping(value = "/update", method = RequestMethod.GET)
	public String updateAccount(@RequestParam(value = "id", required = true) int id) {
		int t;
		try {
			t = accountService.updateAccount(id);
			if (t == 1) {
				return "success";
			} else {
				return "fail";
			}
		} catch (Exception e) {
			return "请联系管理员";
		}

	}

	@RequestMapping(value = "/delete", method = RequestMethod.GET)
	public String deleteAccount(@RequestParam(value = "id", required = true) int id) {

		int t;
		try {
			t = accountService.deleteAccount(id);
			if (t == 1) {
				return "success";
			} else {
				return "fail";
			}
		} catch (Exception e) {
			return "请联系管理员";
		}

	}

}

四 测试

运行Application，在浏览器中输入http://localhost:8023/account/list进行测试

测试成功！

springboot确实方便！！