目录
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 { @Bean public 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.DruidDataSource driver-class-name: com.mysql.cj.jdbc.Driver url: jdbc:mysql://localhost:3306/mybatisplus_db?serverTimezone=Asia/Shanghai username: root password: 123456 # 开启mp的日志（输出到控制台） mybatis-plus: configuration: log-impl: org.apache.ibatis.logging.stdout.StdOutImpl5、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 { @Autowired private UserDao userDao; @Test void testGetAll() { List<User> userList = userDao.selectList(null); userList.forEach(System.out::println); } @Test void 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)
