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")@SpringBootApplicationpublic 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;@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。

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"

@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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