springboot整合mybatis笔记

springboot整合mybatis笔记

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前言

这是笔者学习springboot整合mybatis框架的笔记，仅用于记录研究。

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提示：以下是本篇文章正文内容。

一、创建springboot项目

1.1 这里使用的是Maven+springboot，软件：IDEA。

1.2 选中springweb、jdbc、mysql driver

二、导入其它依赖

这里导入mybatis和lombook

  <!-- https://mvnrepository.com/artifact/org.mybatis.spring.boot/mybatis-spring-boot-starter -->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.1.1</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>

三、配置数据库

在application.properties（yml）中配置数据库连接信息和mybatis配置。

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

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

四、建立pojo实体类

package com.lazy.pojo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@NoArgsConstructor
@AllArgsConstructor
public class User {
    private  int uid;
    //id
    private  String uname;;
    //名字
    private  String password;
    //密码
}

五、写出userMapper接口与UserMapper.xml

import org.apache.ibatis.annotations.Mapper;
import org.springframework.stereotype.Repository;

import java.util.List;
//这是一个MyBatis的mapper类
@Mapper
@Repository
public interface UserMapper {


        List<User> queryUserList();

        User queryUserById(int id);

        int addUser(User user);

        int deleteUser(User user);

}

UserMapper.xml

" namespace"绑定mapper接口

<?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.lazy.mapper.UserMapper">
    <select id="queryUserList" resultType="User">
        select * from user;
    </select>

    <select id="queryUserById" resultType="User" parameterType="int">
        select * from user where uid = #{uid};
    </select>

    <delete id="deleteUser" parameterType="int">
        delete from user where uid = #{uid}
    </delete>

    <insert id="addUser" parameterType="User" >
        insert into user(uid, uname, password) values (#{uid},#{uname},#{password});

    </insert>
</mapper>

五、编写controller层

笔者这里不用service层，直接在controller层中调用maper接口来实现这个小demo。

package com.lazy.controller;

import com.lazy.mapper.UserMapper;
import com.lazy.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> list = userMapper.queryUserList();
        for(User user : list){
            System.out.println(user);
        }
        return  list;

    }
}

六、运行测试

七、附上项目结构

总结

• 这是笔者学习springboot项目整合mybatis的笔记用于梳理知识。
• 学习参考是狂神的视频，这位博主讲得很不错，时常看源码解析，讲得很透彻。