SpringBoot整合MyBatis详细教程~

旧城等待， 2022-12-15 02:26 159阅读 0赞

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### 目录 ###

*  1. 导入依赖
 *  2. 连接数据库
 *  3. 编写数据库配置信息
 *  4. 编写pojo实体类
 *  5. 编写mapper接口
 *  6. 编写mapper.xml
 *  7. 编写controller
 *  8. 测试

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# 1. 导入依赖 #

> 首先新建一个springboot项目，勾选组件时勾选`Spring Web`、`JDBC API`、`MySQL Driver`

然后导入以下整合依赖

<dependency>
        <groupId>org.mybatis.spring.boot</groupId>
        <artifactId>mybatis-spring-boot-starter</artifactId>
        <version>2.1.3</version>
    </dependency>

# 2. 连接数据库 #

数据库代码：

-- 创建数据库
    CREATE DATABASE springboot;
    
    -- 使用springboot数据库
    use springboot;
    
    -- 创建user表
    CREATE TABLE IF NOT EXISTS `user`(
    	`id` INT(4) NOT NULL AUTO_INCREMENT COMMENT '身份号',
    	`name` VARCHAR(30) NOT NULL DEFAULT '匿名' COMMENT '姓名',
    	`pwd` VARCHAR(30) NOT NULL DEFAULT '123456' COMMENT '密码',
    	PRIMARY KEY (`id`)
    )ENGINE=INNODB DEFAULT CHARSET=utf8
    
    -- 给user表插入数据
    INSERT INTO `user`(`id`,`name`,`pwd`) 
    VALUES ('1','zsr',000204),('2','gcc',000421),('3','BaretH',200024);

然后IDEA连接数据库  
![image-20201008203845928][]  
打开我们创建的数据库`springboot`  
![image-20201008203924600][]  
对应的`user`表  
![image-20201008204058928][]

# 3. 编写数据库配置信息 #

> 在springboot配置文件中配置数据库信息

spring.datasource.username=root
    spring.datasource.password=200024
    spring.datasource.url=jdbc:mysql://localhost:3306/springboot?useUnicode=true&characterEncoding=utf-8&serverTimezone=UTC
    spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

# 4. 编写pojo实体类 #

> 在主程序同级目录下新建`pojo`包，其中新建`User`实体类（使用了lombok）
> 
> ![image-20201011220654780][]

package com.zsr.pojo;
    
    import lombok.AllArgsConstructor;
    import lombok.Data;
    import lombok.NoArgsConstructor;
    
    @Data
    @AllArgsConstructor
    @NoArgsConstructor
    public class User { 
        int id;
        String name;
        String password;
    }

# 5. 编写mapper接口 #

> 在主程序同级目录下新建`mapper`包，其中新建`UserMapper`接口
> 
> ![image-20201011220718188][]

package com.zsr.mapper;
    
    import com.zsr.pojo.User;
    import org.apache.ibatis.annotations.Mapper;
    import org.springframework.stereotype.Repository;
    
    import java.util.List;
    
    @Mapper //表示这是Mybatis的mapper类
    @Repository
    public interface UserMapper { 
        List<User> queryUserList();
    
        User queryUserByID(int id);
    
        int addUser(User user);
    
        int updateUser(User user);
    
        int deleteUser(int id);
    }j

# 6. 编写mapper.xml #

> 在resources目录下新建`mabatis`包，其中新建`mapper`包，再在其中新建`mapper.xml`
> 
> ![image-20201011225616633][]

<?xml version="1.0" encoding="UTF-8" ?>
    <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
    <mapper namespace="com.zsr.mapper.UserMapper">
        <select id="queryUserList" resultType="user">
            select * from user
        </select>
    
        <select id="queryUserByID" resultType="user">
            select * from user where id= #{id}
        </select>
    
        <insert id="addUser" parameterType="user">
            insert into user(id,name,pwd) values (#{id},#{name},#{pwd})
        </insert>
    
        <update id="updateUser" parameterType="user">
            update user set name=#{name},pwd=#{pwd} where id=#{id}
        </update>
    
        <delete id="deleteUser" parameterType="int">
            delete from user where id=#{id}
        </delete>
    </mapper>

然后需要到springboot核心配置文件`application.properties`中绑定mapper.xml文件

#整合mybatis
    mybatis.type-aliases-package=com.zsr.pojo
    mybatis.mapper-locations=classpath:mybatis/mapper/*.xml

# 7. 编写controller #

> 在主程序同级目录下新建`controller`包，在其中新建`UserController`

package com.zsr.controller;
    
    import com.zsr.mapper.UserMapper;
    import com.zsr.pojo.User;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    import java.util.List;
    
    @RestController
    public class UserController { 
        @Autowired
        private UserMapper userMapper;
    
        @GetMapping("/queryUserList")
        public List<User> queryUserList() { 
            List<User> users = userMapper.queryUserList();
            return users;
        }
    
        @GetMapping("/queryUserByID")
        public User queryUserByID() { 
            User user = userMapper.queryUserByID(2);
            return user;
        }
    
        @GetMapping("/addUser")
        public String addUser() { 
            userMapper.addUser(new User(4, "zml", "45632"));
            return "增加用户完毕";
        }
    
        @GetMapping("/updateUser")
        public String updateUser() { 
            userMapper.updateUser(new User(4, "zml", "678910"));
            return "修改用户完毕";
        }
    
        @GetMapping("/deleteUser")
        public String deleteUser() { 
            userMapper.deleteUser(4);
            return "删除用户完毕";
        }
    }

# 8. 测试 #

1.  测试访问`http://localhost:8080/queryUserList`
    
    ![image-20201011232324236][]
2.  测试访问`http://localhost:8080/queryUserByID`
    
    ![image-20201011232404442][]
3.  测试访问`http://localhost:8080/addUser`
    
    ![1be624e45b7146f8ff41263e72d515d2.png][]
    
    ![image-20201011232855926][]
4.  测试访问`http://localhost:8080/updateUser`
    
    ![image-20201011232934604][]
    
    ![image-20201011233014935][]
5.  测试访问`http://localhost:8080/deleteUser`
    
    ![image-20201011233046907][]
    
    ![image-20201011233112576][]

[image-20201008203845928]: https://gitee.com/zhong_siru/images/raw/master//img/image-20201008203845928.png
[image-20201008203924600]: https://gitee.com/zhong_siru/images/raw/master//img/image-20201008203924600.png
[image-20201008204058928]: https://gitee.com/zhong_siru/images/raw/master//img/image-20201008204058928.png
[image-20201011220654780]: https://gitee.com/zhong_siru/images/raw/master//img/image-20201011220654780.png
[image-20201011220718188]: https://gitee.com/zhong_siru/images/raw/master//img/image-20201011220718188.png
[image-20201011225616633]: https://gitee.com/zhong_siru/images/raw/master//img/image-20201011225616633.png
[image-20201011232324236]: /images/20221123/6e448a2280304d3e8ceb4e4bf2a3bc31.png
[image-20201011232404442]: /images/20221123/cf54c2ac42f14d4aa1a4dae97447a477.png
[1be624e45b7146f8ff41263e72d515d2.png]: /images/20221123/605fb22c2bfd48ddbee8606b0737168a.png
[image-20201011232855926]: https://gitee.com/zhong_siru/images/raw/master//img/image-20201011232855926.png
[image-20201011232934604]: /images/20221123/2f1728a6d410464685f934fcea6bbd30.png
[image-20201011233014935]: https://gitee.com/zhong_siru/images/raw/master//img/image-20201011233014935.png
[image-20201011233046907]: /images/20221123/479d036e850245eca5d0c5a3b30b0fed.png
[image-20201011233112576]: https://gitee.com/zhong_siru/images/raw/master//img/image-20201011233112576.png