mybatis-plus结合pageHelper使用

news2024/9/29 1:15:10

mybatis-plus结合pageHelper使用

1.在pom.xml文件中添加依赖
2.在application.yml中添加配置
3.插件配置
4.使用pageHelper

1.在pom.xml文件中添加依赖

 <!-- mybatis-plus依赖 -->
  <dependency>
     <groupId>com.baomidou</groupId>
     <artifactId>mybatis-plus-boot-starter</artifactId>
     <version>3.5.3.1</version>
 </dependency>
 <!-- 分页插件pageHelper -->
  <dependency>
     <groupId>com.github.pagehelper</groupId>
     <artifactId>pagehelper</artifactId>
     <version>5.3.1</version>
  </dependency>

通过测试发现，mybatis-plus-boot-starter、pagehelper大于上述版本的也是可以的

比如

<!--mybatis-plus-->
  <dependency>
      <groupId>com.baomidou</groupId>
      <artifactId>mybatis-plus-boot-starter</artifactId>
      <version>3.5.5</version>
  </dependency>
  <!--分页控件-->
  <dependency>
      <groupId>com.github.pagehelper</groupId>
      <artifactId>pagehelper</artifactId>
      <version>5.3.3</version>
  </dependency>

2.在application.yml中添加配置

注意pagehelper是spring的子参数
mybatis-plus与spring同级

server:
  port: 8080
spring:
  main:
    allow-circular-references: true
  datasource:
    url: jdbc:mysql://localhost:3306/test_db?useSSL=false&serverTimezone=UTC&characterEncoding=utf8
    username: root
    password: 123456
    driver-class-name: com.mysql.cj.jdbc.Driver
  pagehelper:
    helper-dialect: mysql # 指定数据库方言
    reasonable: true # 合理化分页参数设置
    support-methods-arguments: true # 支持通过Mapper接口方法参数来传递分页参数
    params: count=countSql # 支持通过POJO或Map中的countSql属性来指定count查询
mybatis-plus:
  type-aliases-package: com.xhd.authSystem.pojo
  mapper-locations: classpath:mapper/*.xml
  configuration:
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl

3.插件配置

package com.xhd.authSystem.config;

import com.baomidou.mybatisplus.annotation.DbType;
import com.baomidou.mybatisplus.extension.plugins.MybatisPlusInterceptor;
import com.baomidou.mybatisplus.extension.plugins.inner.PaginationInnerInterceptor;
import com.github.pagehelper.PageInterceptor;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.util.Properties;

/**
 * 分页插件配置,不配置的话分页效果不起效
 */
@Configuration
public class MybatisPlusConfig {

    /**
     * MybatisPlus分页插件
     */
    @Bean
    public MybatisPlusInterceptor mybatisPlusInterceptor() {
        MybatisPlusInterceptor mybatisPlusInterceptor = new MybatisPlusInterceptor();
        mybatisPlusInterceptor.addInnerInterceptor(new PaginationInnerInterceptor(DbType.MYSQL));
        return mybatisPlusInterceptor;
    }


    /**
     * PageHelper分页插件
     * */
    @Bean
    PageInterceptor pageInterceptor() {
        PageInterceptor pageInterceptor = new PageInterceptor();
        Properties properties = new Properties();
        properties.setProperty("helperDialect", "mysql");
        pageInterceptor.setProperties(properties);
        return pageInterceptor;
    }
}

4.使用pageHelper

PageHelper.startPage的下一行代码需要是执行sql的操作

//分页处理
PageHelper.startPage(pageNum,pageSize);
//查询分组信息
List<Fund> list = fundMapper.getFundList(fund);
//获取分页信息
PageInfo<Fund> infoList = new PageInfo<>(list);
return infoList;