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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
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：
<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
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
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
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。
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"
@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
@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
@test
void testdeletebyid() {
int result = userdao.deletebyid(1);
system.out.println(result);
}
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