springboot2.1入门系列五 springboot项目使用Mybatis

墨蓝 2022-03-25 09:14 203阅读 0赞

本文为Spring Boot2.1系列的第五篇，代码可以从github下载 [https://github.com/yinww/demo-springboot2.git][https_github.com_yinww_demo-springboot2.git]

本章介绍Springboot 使用Mybatis。

一、准备数据库

create database demo005;
    
    create table user
    (
       id                   bigint not null,
       name            varchar(64),
       primary key (id)
    )
    ENGINE = InnoDB
    DEFAULT CHARSET = utf8;

二、创建工程demo005

pom.xml的内容为

<project xmlns="http://maven.apache.org/POM/4.0.0"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
        <modelVersion>4.0.0</modelVersion>
        <parent>
            <groupId>com.yinww</groupId>
            <artifactId>demo-springboot2</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </parent>
        <artifactId>demo005</artifactId>
    
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
            <dependency>
                <groupId>org.mybatis.spring.boot</groupId>
                <artifactId>mybatis-spring-boot-starter</artifactId>
                <version>1.3.2</version>
            </dependency>
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <scope>runtime</scope>
            </dependency>
        </dependencies>
    </project>

三、Java代码

主类

package com.yinww.demo.springboot2.demo005;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    
    @SpringBootApplication
    public class Demo005Application {
    
        public static void main(String[] args) {
            SpringApplication.run(Demo005Application.class, args);
        }
    
    }

User类

package com.yinww.demo.springboot2.demo005.domain;
    
    public class User {
    
        private Long id;
        private String name;
    
        // getter and setter
    
    }

UserMapper

package com.yinww.demo.springboot2.demo005.mapper;
    
    import org.apache.ibatis.annotations.Mapper;
    
    import com.yinww.demo.springboot2.demo005.domain.User;
    
    @Mapper
    public interface UserMapper {
    
        void addUser(User user);
    
    }

UserService

package com.yinww.demo.springboot2.demo005.service;
    
    import com.yinww.demo.springboot2.demo005.domain.User;
    
    public interface UserService {
        
        void addUser(User user);
    
    }

UserServiceImpl

package com.yinww.demo.springboot2.demo005.service.impl;
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Service;
    
    import com.yinww.demo.springboot2.demo005.domain.User;
    import com.yinww.demo.springboot2.demo005.mapper.UserMapper;
    import com.yinww.demo.springboot2.demo005.service.UserService;
    
    @Service
    public class UserServiceImpl implements UserService {
        
        @Autowired
        private UserMapper userMapper;
    
        @Override
        public void addUser(User user) {
            userMapper.addUser(user);
        }
    
    }

Controller， 提供了一个存储数据的接口

package com.yinww.demo.springboot2.demo005.controller;
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    import com.yinww.demo.springboot2.demo005.domain.User;
    import com.yinww.demo.springboot2.demo005.service.UserService;
    
    @RestController
    public class UserController {
        
        @Autowired
        private UserService userService;
        
        @RequestMapping("add")
        public Object addUser() {
            User user = new User();
            user.setId(new Long(1));
            user.setName("张三丰");
            userService.addUser(user);
            return "ok";
        }
    
    }

四、配置文件

UserMapper.xml

<?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.yinww.demo.springboot2.demo005.mapper.UserMapper">
        <resultMap id="UserResultMap" type="com.yinww.demo.springboot2.demo005.domain.User">
            <id column="id" jdbcType="BIGINT" property="id"/>
            <result column="name" jdbcType="VARCHAR" property="name"/>
        </resultMap>
    
        <insert id="addUser">
            insert into user (id, name) values(#{id}, #{name})
        </insert>
    </mapper>

application.properties 主要配置redis

spring.application.name=demo005
    
    spring.datasource.driverClassName=com.mysql.cj.jdbc.Driver
    spring.datasource.url=jdbc:mysql://127.0.0.1:3306/demo005?useUnicode=true&characterEncoding=UTF-8&autoReconnect=true&useSSL=false&zeroDateTimeBehavior=convertToNull&allowMultiQueries=true&serverTimezone=GMT%2B8
    spring.datasource.username=root
    spring.datasource.password=root
    
    mybatis.typeAliasesPackage=com.yinww.demo.springboot2.demo005.domain
    mybatis.mapperLocations=classpath:mapper/*.xml

五、运行

执行

java -jar demo005-0.0.1-SNAPSHOT.jar

也可以以其他方式启动。

添加数据

![20190119190156904.png][]

查看数据库，可以看到数据已经保存成功

mysql> select * from user;
    +----+-----------+
    | id | name      |
    +----+-----------+
    |  1 | 张三丰    |
    +----+-----------+
    1 row in set (0.00 sec)

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![2018111718160012.jpg][]

[https_github.com_yinww_demo-springboot2.git]: https://github.com/yinww/demo-springboot2.git
[20190119190156904.png]: /images/20220325/005fc926214a46a7a09c126c6a234189.png
[2018111718160012.jpg]: /images/20220325/4aab5b7742534b5ca304c87a0815605b.png