搭建mybatis-plus框架并进行数据库添加
mybatis-plus（简称 mp）是一个 mybatis 的增强工具，在 mybatis 的基础上只做增强不做改变，为简化开发、提高效率而生。
1.搭建环境
jdk：jdk1.8.0_261
idea：intellij idea
maven：apache-maven-3.3.6
mysql：mysql-5.5.61
2.项目搭建
3.配置maven
4.项目结构
创建数据库
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create database tzy03;use tzy03;create table user( id int(11) primary key auto_increment, name varchar(50), pass varchar(50), );insert into user(name,passs) values('tom','1215');select * from user; |
新建完成以后，打开pom.xml后添加以下依赖：
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<dependency> <groupid>com.baomidou</groupid> <artifactid>mybatis-plus-boot-starter</artifactid> <version>3.4.0</version> </dependency> <dependency> <groupid>mysql</groupid> <artifactid>mysql-connector-java</artifactid> <version>5.1.49</version> </dependency> <dependency> <groupid>org.projectlombok</groupid> <artifactid>lombok</artifactid> <version>1.18.12</version> <scope>provided</scope> </dependency> <dependency> <groupid>org.springframework.boot</groupid> <artifactid>spring-boot-test</artifactid> </dependency> |
5.配置 mapperscan 注解
扫描mapper层
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package com.tzy.demo;import org.mybatis.spring.annotation.mapperscan;import org.springframework.boot.springapplication;import org.springframework.boot.autoconfigure.springbootapplication;@mapperscan("com.tzy.demo.mapper")@springbootapplicationpublic class demoapplication { public static void main(string[] args) { springapplication.run(demoapplication.class, args); }} |
成功界面
6.创建实体
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package com.tzy.demo.pojo;import com.baomidou.mybatisplus.annotation.tablefield;import com.baomidou.mybatisplus.annotation.tableid;public class user { @tableid(value = "id") public int id; @tablefield(value = "name") public string name; @tablefield(value = "pass") public string pass; @override public string tostring() { return "user{" + "id=" + id + ", name='" + name + '\'' + ", pass='" + pass + '\'' + '}'; } public user(){} public int getid() { return id; } public void setid(int id) { this.id = id; } public string getname() { return name; } public void setname(string name) { this.name = name; } public string getpass() { return pass; } public void setpass(string pass) { this.pass = pass; }} |
7.创建接口
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package com.tzy.demo.mapper;import com.baomidou.mybatisplus.core.mapper.basemapper;import com.tzy.demo.pojo.user;import org.springframework.stereotype.repository;@repositorypublic interface userdao extends basemapper<user> {} |
8.测试
在test文件里自动生成demoapplicationtests类里往数据库中添加数据进行测试。
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package com.tzy.demo;import com.tzy.demo.mapper.userdao;import com.tzy.demo.pojo.user;import org.junit.jupiter.api.test;import org.springframework.beans.factory.annotation.autowired;import org.springframework.boot.test.context.springboottest;@springboottestclass demoapplicationtests { @autowired private userdao userdao; @test void insert(){ user user1=new user(); user1.setname("田哲沅"); user1.setpass("1218"); int result=userdao.insert(user1); system.out.println("result:"+result); system.out.println(user1);//id会自动回填到user对象中 } } |
成功界面
8.1 updatebyid
需求信息：将id为1的员工的姓名更改为"tzy"
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@test void testupdatebyid() { user user2=userdao.selectbyid(1); user2.setname("tzy"); int result = userdao.updatebyid(user2); system.out.println(result); }} |
8.2 selectbyid
查询id为1的员工信息
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@test void selectbyid() { user user2=userdao.selectbyid(1); system.out.println(user2); }} |
8.3 deletebyid
删除id为1的员工信息
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@test void testdeletebyid() { int result = userdao.deletebyid(1); system.out.println(result); } |
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原文链接：https://blog.csdn.net/it1880456/article/details/114680208
