pageHelper 分页插件使用

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <!-- 配置分页插件 -->
    <plugins>
        <plugin interceptor="com.github.pagehelper.PageHelper">
            <!-- 设置数据库类型 Oracle,Mysql,MariaDB,SQLite,Hsqldb,PostgreSQL六种数据库-->        
            <property name="dialect" value="mysql"/>
        </plugin>
    </plugins>
</configuration>

PageHelper.startPage(1, 10);

PageInfo<TbItem> pageInfo = new PageInfo<>(list);
System.out.println(pageInfo.getTotal());

package com.taotao.controller;

import java.util.List;

import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import com.taotao.mapper.TbItemMapper;
import com.taotao.pojo.TbItem;
import com.taotao.pojo.TbItemExample;

public class testPageHelper {
    
    @Test
    public void testPageHelper() {
        //创建一个 spring 容器
        ApplicationContext applicationContext = new ClassPathXmlApplicationContext("classpath:spring/applicationContext*.xml");
        
        //从 spring 容器中获取 TbItemMapper 代理对象
        TbItemMapper tbItemMapper = applicationContext.getBean(TbItemMapper.class);
        
        //执行查询
        TbItemExample example = new TbItemExample();
        
        //分页处理
        PageHelper.startPage(1, 10);  //第一页  取10条
        List<TbItem> list = tbItemMapper.selectByExample(example);
        for (TbItem tbItem : list) {
            System.out.println(tbItem.getId() + " "+ tbItem.getTitle());
        }
        
        //取分页信息
        PageInfo<TbItem> pageInfo = new PageInfo<>(list);
        System.out.println(pageInfo.getTotal());
    }
}