SpringBoot整合MyBatisPlus

简介：MyBatisPlus是国人开发的更加适合于国人使用的MyBatis。

环境准备

数据库建表语句

-- 删除tb_brand表
drop table if exists tb_brand;
-- 创建tb_brand表
create table tb_brand
(
    -- id 主键
    id           int primary key auto_increment,
    -- 品牌名称
    brand_name   varchar(20),
    -- 企业名称
    company_name varchar(20),
    -- 排序字段
    ordered      int,
    -- 描述信息
    description  varchar(100),
    -- 状态：0：禁用  1：启用
    status       int
);
-- 添加数据
insert into tb_brand (brand_name, company_name, ordered, description, status)
values ('三只松鼠', '三只松鼠股份有限公司', 5, '好吃不上火', 0),
       ('华为', '华为技术有限公司', 100, '华为致力于把数字世界带入每个人、每个家庭、每个组织，构建万物互联的智能世界', 1),
       ('小米', '小米科技有限公司', 50, 'are you ok', 1);

创建项目


去官网找：官网地址mvn官网（但是可能打不开）

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.7.6</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>
	<groupId>com.example</groupId>
	<artifactId>SpringBootMybatis-plus</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>SpringBootMybatis-plus</name>
	<description>SpringBootMybatis-plus</description>
	<properties>
		<java.version>1.8</java.version>
	</properties>
	<dependencies>
		<dependency>
			<groupId>com.baomidou</groupId>
			<artifactId>mybatis-plus-boot-starter</artifactId>
			<version>3.4.3</version>
		</dependency>

		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<scope>runtime</scope>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>

</project>

application.yml

# 数据库配置信息
spring:
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/mybatis
    username: root
    password: 123456

# 设置Mp相关配置
mybatis-plus:
  global-config:
    db-config:
      table-prefix: tb_ # 这里写数据库表的前缀

Brand与BrandDao

文件结构

brand

package com.example.springbootmybatisplus.domain;

public class Brand {
    private Integer id;
    private String brand_name;
    private String companyName;
    private Integer ordered;
    private String description;

    private boolean status;

    @java.lang.Override
    public java.lang.String toString() {
        return "brand{" +
                "id=" + id +
                ", brand_name='" + brand_name + '\'' +
                ", companyName='" + companyName + '\'' +
                ", ordered=" + ordered +
                ", description='" + description + '\'' +
                ", status=" + status +
                '}';
    }



    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getBrand_name() {
        return brand_name;
    }

    public void setBrand_name(String brand_name) {
        this.brand_name = brand_name;
    }

    public String getCompanyName() {
        return companyName;
    }

    public void setCompanyName(String companyName) {
        this.companyName = companyName;
    }

    public Integer getOrdered() {
        return ordered;
    }

    public void setOrdered(Integer ordered) {
        this.ordered = ordered;
    }

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }

    public boolean isStatus() {
        return status;
    }

    public void setStatus(boolean status) {
        this.status = status;
    }
}

BrandDao

package com.example.springbootmybatisplus.dao;

import com.example.springbootmybatisplus.domain.Brand;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;

import java.awt.print.Book;

@Mapper
public interface BrandDao {
    @Select("select * from tb_brand where id = #{id}")
    public Brand getById(Integer id);
}

测试类

package com.example.springbootmybatisplus;

import com.example.springbootmybatisplus.dao.BrandDao;
import com.example.springbootmybatisplus.domain.Brand;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

@SpringBootTest
class SpringBootMybatisPlusApplicationTests {

	@Autowired
	private BrandDao brandDao;
	@Test
	void contextLoads() {
		System.out.println(brandDao.getById(1));
	}

}

运行结果