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" ) @springbootapplication public 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;
@repository public 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;
@springboottest class 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
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