MyBatis-Plus快速搭建入门，看这一篇就足够了

一、环境快速搭建 1、创建数据库 mybatis_plus，创建表 if_user 表。

create table if_user
(
    id    bigint      not null comment '主键ID'
        primary key,
    name  varchar(30) null comment '姓名',
    age   int         null comment '年龄',
    email varchar(50) null comment '邮箱'
);
INSERT INTO mybatis_plus.if_user (id, name, age, email) VALUES (1, 'Tom', 11, '123@163.com');
INSERT INTO mybatis_plus.if_user (id, name, age, email) VALUES (2, 'Jack', 12, '222@163.com');
INSERT INTO mybatis_plus.if_user (id, name, age, email) VALUES (3, 'Sl', 18, '333@163.com');

2、创建一个SpringBoot工程，pom.xml配置。



    4.0.0
    
        org.springframework.boot
        spring-boot-starter-parent
        2.3.4.RELEASE
         
    
    com.study
    mybatis-plus
    0.0.1-SNAPSHOT
    mybatis-plus
    Demo project for Spring Boot
    
        1.8
    
    
        
            org.springframework.boot
            spring-boot-starter
        
        
            com.baomidou
            mybatis-plus-boot-starter
            3.4.1
        
        
            mysql
            mysql-connector-java
            runtime
        
        
            org.projectlombok
            lombok
            true
        
        
            org.springframework.boot
            spring-boot-starter-test
            test
            
                
                    org.junit.vintage
                    junit-vintage-engine
                
            
        
        
            com.alibaba
            druid
            1.1.10
        
    

    
        
            
                org.springframework.boot
                spring-boot-maven-plugin

3、application.yml 配置，mybatis日志添加

server:
  port: 8080 #项目启动端口号
  servlet:
    context-path: / #访问前缀路径
spring:
  datasource: #mysql数据库连接配置
    username: root
    password: root
    url: jdbc:mysql://localhost:3306/mybatis_plus?useUnicode=true&characterEncoding=utf-8&useSSL=true&serverTimezone=UTC
    type: com.alibaba.druid.pool.DruidDataSource
    driver-class-name: com.mysql.cj.jdbc.Driver
mybatis-plus: #mybatis日志
  configuration:
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl

4、创建pojo包，创建if_user 实体类。

package com.study.mybatisplus.pojo;

import com.baomidou.mybatisplus.annotation.TableName;
import lombok.Data;


@TableName("if_user")
@Data
public class IfUser {
    private Long id;
    private String name;
    private Integer age;
    private String email;
}

5、编写UserMapper接口，继承baseMapper接口（默认提供了一系列的增删改查的基础方法）

package com.study.mybatisplus.mapper;

import com.baomidou.mybatisplus.core.mapper.baseMapper;
import com.study.mybatisplus.pojo.IfUser;
import org.apache.ibatis.annotations.Mapper;


@Mapper
public interface UserMapper extends baseMapper {
}

6、编写测试类

package com.study.mybatisplus;

import com.study.mybatisplus.mapper.UserMapper;
import com.study.mybatisplus.pojo.IfUser;
import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;

import javax.annotation.Resource;
import java.util.List;

@SpringBootTest
class MybatisPlusApplicationTests {

    @Resource
    private UserMapper userMapper;

    @Test
    void testSelectList() {
        List users = userMapper.selectList(null);//selectList()方法的参数：封装了查询条件
        users.forEach(System.out::println);
    }
}

7、补充、查看sql输出日志

> Preparing: SELECT id,name,age,email FROM if_user
> Parameters:
< Columns: id, name, age, email
< Row: 1, Tom, 11, 123@163.com
<== Row: 2, Jack, 12, 222@163.com
<== Row: 3, Sl, 18, 333@163.com
<== Total: 3
IfUser(id=1, name=Tom, age=11, email=123@163.com)
IfUser(id=2, name=Jack, age=12, email=222@163.com)
IfUser(id=3, name=Sl, age=18, email=333@163.com)

MyBatis-Plus快速搭建入门，看这一篇就足够了

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