MyBatis-Plus分页插件不生效的解决方法

描述

项目中用到boot 整合 mybatis-plus , 个人在使用分页条件查询的时候一直查不出 total, pages, 终于找到原因了.

环境

<springboot.version>2.1.5.RELEASE</springboot.version>
<mybatisplus.version>3.1.1</mybatisplus.version>

配置

1.自定义MybatisPlusConfig 配置分页插件

package com.eyelake.smart.park.portal.config;

import com.baomidou.mybatisplus.extension.plugins.PaginationInterceptor;
import com.baomidou.mybatisplus.extension.plugins.pagination.optimize.JsqlParserCountOptimize;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**
* @Author: LiangJingXing
* @Date: 2019/8/21 19:38
* @Decription: MybatisPlus 配置分页 性能分析
*/
@Configuration
@MapperScan("com.eyelake.smart.park.portal.mapper.park")
public class MybatisPlusConfig {

/**
  * 分页插件
  */
 @Bean
 public PaginationInterceptor paginationInterceptor() {
   return new PaginationInterceptor().setDialectType("mysql");
 }
}

2.自定义的DataSourceConfig

public class DataSourceConfig {
@Autowired
private PaginationInterceptor paginationInterceptor;
...
@Primary
@Bean(name = "helmetSqlSessionFactory")
public SqlSessionFactory helmetSqlSessionFactory(@Qualifier("helmetDataSource") DataSource helmetDataSource)
 throws Exception {
MybatisSqlSessionFactoryBean sqlSessionFactory = new MybatisSqlSessionFactoryBean();
sqlSessionFactory.setDataSource(helmetDataSource);
...
// 关键代码 设置 MyBatis-Plus 分页插件
Interceptor[] plugins = {paginationInterceptor};
sqlSessionFactory.setPlugins(plugins);
...
return sqlSessionFactory.getObject();
}
}

3.执行分页查询

   Page<UserInfoDto> page = new Page<>(currentPage, pageSize);
   QueryWrapper<UserInfoDto> userInfoDtoQueryWrapper = new QueryWrapper<>();
   userInfoDtoQueryWrapper.groupBy("tui.id ");
   IPage<UserInfoDto> userInfoDtoIPage = baseMapper.selectAllUserInfoDtoByPage(page, userInfoDtoQueryWrapper);

4.查看数据

mybatis plus分页不出来pages和total的解决记录

按着官方的分页例子写完以后，发现pages和total都为0，仔细观察了好多遍还是没解决。

最好找到一段配置添加后，正常了。

package kulink.cvscloud.core.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import com.baomidou.mybatisplus.plugins.PaginationInterceptor;

@Configuration
public class MybatisPlusConfig {
/**
  *  mybatis-plus分页插件
  */
 @Bean
 public PaginationInterceptor paginationInterceptor() {
   PaginationInterceptor page = new PaginationInterceptor();
   page.setDialectType("mysql");
   return page;
 }
}

来源：https://blog.csdn.net/qq_36241003/article/details/100056609