搭建MyBatis-Plus框架并进行数据库增删改查功能

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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