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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