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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