目录

1、设置分页拦截器

2、创建数据库及表

3、pom.xml

4、添加MP的相关配置信息 application.yml

5、根据数据库表创建实体类 User

6、创建 UserDao 接口

7、编写引导类

8、编写测试类

9、Run的运行结果

---

1、设置分页拦截器

package com.example.config;
import com.baomidou.mybatisplus.annotation.DbType;
import com.baomidou.mybatisplus.extension.plugins.MybatisPlusInterceptor;
import com.baomidou.mybatisplus.extension.plugins.inner.PaginationInnerInterceptor;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
@Configuration
public class MpConfig {@Beanpublic MybatisPlusInterceptor mybatisPlusInterceptor() {MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();interceptor.addInnerInterceptor(new PaginationInnerInterceptor(DbType.MYSQL));return interceptor;}
}

2、创建数据库及表

create database if not exists mybatisplus_db character set utf8;
use mybatisplus_db;
CREATE TABLE user (id bigint(20) primary key auto_increment,name varchar(32) not null,password  varchar(32) not null,age int(3) not null ,tel varchar(32) not null
);
insert into user values(1,'Tom','tom',3,'18866668888');
insert into user values(2,'Jerry','jerry',4,'16688886666');
insert into user values(3,'Jock','123456',41,'18812345678');
insert into user values(4,'小明','xm',15,'4006184000');

3、pom.xml

• springboot版本是 2.5.0

<?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>2.5.0</version><relativePath/> <!-- lookup parent from repository --></parent><!-- Generated by https://start.springboot.io --><!-- 优质的 spring/boot/data/security/cloud 框架中文文档尽在 => https://springdoc.cn --><groupId>com.example</groupId><artifactId>mp_demo</artifactId><version>0.0.1-SNAPSHOT</version><name>mp_demo</name><description>mp_demo</description><properties><java.version>17</java.version></properties><dependencies><dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus-boot-starter</artifactId><version>3.4.1</version></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter</artifactId></dependency><!--<dependency><groupId>com.mysql</groupId><artifactId>mysql-connector-j</artifactId><version>8.0.32</version><scope>runtime</scope></dependency>--><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency><dependency><groupId>com.alibaba</groupId><artifactId>druid</artifactId><version>1.1.16</version></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><version>1.18.26</version></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build></project>

4、添加MP的相关配置信息 application.yml

spring:datasource:type: com.alibaba.druid.pool.DruidDataSourcedriver-class-name: com.mysql.cj.jdbc.Driverurl: jdbc:mysql://localhost:3306/mybatisplus_db?serverTimezone=Asia/Shanghaiusername: rootpassword: 123456
# 开启mp的日志（输出到控制台）
mybatis-plus:configuration:log-impl: org.apache.ibatis.logging.stdout.StdOutImpl

5、根据数据库表创建实体类 User

package com.example.model;
import lombok.Data;@Data
public class User {private Long id;private String name;private String password;private Integer age;private String tel;//setter...getter...toString方法略
}

6、创建 UserDao 接口

package com.example.mapper;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.example.model.User;
import org.apache.ibatis.annotations.Mapper;
@Mapper
public interface UserDao extends BaseMapper<User> {
}

7、编写引导类

package com.example;import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;// Generated by https://start.springboot.io
// 优质的 spring/boot/data/security/cloud 框架中文文档尽在 => https://springdoc.cn
@SpringBootApplication
//@MapperScan("com.example.mp_demo.mapper")
public class Mybatisplus01QuickstartApplication {public static void main(String[] args) {SpringApplication.run(Mybatisplus01QuickstartApplication.class, args);}}

8、编写测试类

package com.example;import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.example.mapper.UserDao;
import com.example.model.User;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import java.util.List;@SpringBootTest
class Mybatisplus01QuickstartApplicationTests {@Autowiredprivate UserDao userDao;@Testvoid testGetAll() {List<User> userList = userDao.selectList(null);userList.forEach(System.out::println);}@Testvoid testGetByPage() {// IPage对象封装了分页操作相关的数据IPage<User> page = new Page<>(1, 2);userDao.selectPage(page, null);System.out.println("当前页码值：" + page.getCurrent());System.out.println("每页显示数：" + page.getSize());System.out.println("总记录数：" + page.getTotal());System.out.println("总页码数：" + page.getPages());System.out.println("当前页数据：");page.getRecords().forEach(System.out::println);}}

9、Run的运行结果

JDBC Connection [com.mysql.cj.jdbc.ConnectionImpl@3b35798] will not be managed by Spring
==>  Preparing: SELECT COUNT(*) FROM user
==> Parameters: 
<==    Columns: COUNT(*)
<==        Row: 4
<==      Total: 1
==>  Preparing: SELECT id,name,password,age,tel FROM user LIMIT ?
==> Parameters: 2(Long)
<==    Columns: id, name, password, age, tel
<==        Row: 1, Tom, tom, 3, 18866668888
<==        Row: 2, Jerry, jerry, 4, 16688886666
<==      Total: 2
Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@778a1250]
当前页码值：1
每页显示数：2
总记录数：4
总页码数：2
当前页数据：
User(id=1, name=Tom, password=tom, age=3, tel=18866668888)
User(id=2, name=Jerry, password=jerry, age=4, tel=16688886666)