SpringBoot非官方教程 | 第六篇：springboot整合mybatis

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原文首发于：https://www.fangzhipeng.com/springboot/2017/07/11/springboot-mybatis/

本文出自方志朋的博客

本文主要讲解如何在springboot下整合mybatis，并访问数据库。由于mybatis这个框架太过于流行，所以我就不讲解了。

引入依赖

在pom文件引入mybatis-spring-boot-starter的依赖：

       <dependency>

			<groupId>org.mybatis.spring.boot</groupId>

			<artifactId>mybatis-spring-boot-starter<artifactId>

			<version>1.3.0</version>

		</dependency>

引入数据库连接依赖：

<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>

引入数据源

application.properties配置文件中引入数据源：

spring.datasource.url=jdbc:mysql://localhost:3306/test

spring.datasource.username=root

spring.datasource.password=123456

spring.datasource.driver-class-name=com.mysql.jdbc.Driver

这样，springboot就可以访问数据了。

创建数据库表

建表语句：

-- create table `account`

# DROP TABLE `account` IF EXISTS

CREATE TABLE `account` (

  `id` int(11) NOT NULL AUTO_INCREMENT,

  `name` varchar(20) NOT NULL,

  `money` double DEFAULT NULL,

  PRIMARY KEY (`id`)

) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8;

INSERT INTO `account` VALUES ('1', 'aaa', '1000');

INSERT INTO `account` VALUES ('2', 'bbb', '1000');

INSERT INTO `account` VALUES ('3', 'ccc', '1000');

具体实现

这篇文篇通过注解的形式实现。

创建实体：

public class Account {

   private int id ;

   private String name ;

   private double money;

 setter...

 getter...

}

dao层

@Mapper

public interface AccountMapper {

    @Insert("insert into account(name, money) values(#{name}, #{money})")

    int add(@Param("name") String name, @Param("money") double money);

    @Update("update account set name = #{name}, money = #{money} where id = #{id}")

    int update(@Param("name") String name, @Param("money") double money, @Param("id") int  id);

    @Delete("delete from account where id = #{id}")

    int delete(int id);

    @Select("select id, name as name, money as money from account where id = #{id}")

    Account findAccount(@Param("id") int id);

    @Select("select id, name as name, money as money from account")

    List<Account> findAccountList();

}

service层

@Service

public class AccountService {

    @Autowired

    private AccountMapper accountMapper;

    public int add(String name, double money) {

        return accountMapper.add(name, money);

    }

    public int update(String name, double money, int id) {

        return accountMapper.update(name, money, id);

    }

    public int delete(int id) {

        return accountMapper.delete(id);

    }

    public Account findAccount(int id) {

        return accountMapper.findAccount(id);

    }

    public List<Account> findAccountList() {

        return accountMapper.findAccountList();

    }

}

controller层，构建restful API



package com.forezp.web;

import com.forezp.entity.Account;

import com.forezp.service.AccountService;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.web.bind.annotation.*;

import java.util.List;

/**

 * Created by fangzhipeng on 2017/4/20.

 */

@RestController

@RequestMapping("/account")

public class AccountController {

    @Autowired

    AccountService accountService;

    @RequestMapping(value = "/list", method = RequestMethod.GET)

    public List<Account> getAccounts() {

        return accountService.findAccountList();

    }

    @RequestMapping(value = "/{id}", method = RequestMethod.GET)

    public Account getAccountById(@PathVariable("id") int id) {

        return accountService.findAccount(id);

    }

    @RequestMapping(value = "/{id}", method = RequestMethod.PUT)

    public String updateAccount(@PathVariable("id") int id, @RequestParam(value = "name", required = true) String name,

                                @RequestParam(value = "money", required = true) double money) {

        int t= accountService.update(name,money,id);

        if(t==1) {

            return "success";

        }else {

            return "fail";

        }

    }

    @RequestMapping(value = "/{id}", method = RequestMethod.DELETE)

    public String delete(@PathVariable(value = "id")int id) {

        int t= accountService.delete(id);

        if(t==1) {

            return "success";

        }else {

            return "fail";

        }

    }

    @RequestMapping(value = "", method = RequestMethod.POST)

    public String postAccount(@RequestParam(value = "name") String name,

                              @RequestParam(value = "money") double money) {

       int t= accountService.add(name,money);

       if(t==1) {

           return "success";

       }else {

           return "fail";

       }

    }

}