------------吾亦无他,唯手熟尔，谦卑若愚，好学若饥-------------
本篇博客讲述如何在SpringBoot中整合PageHelper，如何实现带多个条件，以及PageInfo中的属性的中文解释（翻译）
一，jar包
<!-- 分页插件 -->
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper-spring-boot-starter</artifactId>
<version>1.2.3</version>
</dependency>
二，注册Configuration插件
package cn.dawn.util;
/**
* Created by Dawn on 2018/6/24.
*/
import java.util.Properties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import com.github.pagehelper.PageHelper;
/*
* 注册MyBatis分页插件PageHelper
*/
@Configuration
public class MybatisConf {
@Bean
public PageHelper pageHelper() {
System.out.println("MyBatisConfiguration.pageHelper()");
PageHelper pageHelper = new PageHelper();
Properties p = new Properties();
p.setProperty("offsetAsPageNum", "true");
p.setProperty("rowBoundsWithCount", "true");
p.setProperty("reasonable", "true");
pageHelper.setProperties(p);
return pageHelper;
}
}
三，dao层接口
package cn.dawn.mapper;
import cn.dawn.entity.Sys_noteDetail;
import java.util.List;
import java.util.Map;
/**
* Created by Dawn on 2018/4/16.
*/
public interface INoteDAO {
/*笔记分页查询*/
public List<Sys_noteDetail> getOnePagenoteData(Map<String, Object> map) throws Exception;
}
做带条件分页最好是Map，因为特别容易整合智能标签，它的多条件就是Map传进来的
四，dao层xml配置
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="cn.dawn.mapper.INoteDAO">
<!--分页查询-->
<select id="getOnePagenoteData" resultType="cn.dawn.entity.Sys_noteDetail">
SELECT * FROM sys_notedetail
<where>
<if test="dname!= null and dname!=''">
AND dname LIKE '%' #{dname} '%'
</if>
<if test="startdate!= null and startdate!=''">
AND dentrytime>=#{startdate}
</if>
<if test="enddate!= null and enddate!=''">
AND dentrytime<=#{enddate}
</if>
</where>
</select>
</mapper>
五，调用PageHelper，真正使用它
package cn.dawn.service.impl;
import cn.dawn.entity.Sys_noteDetail;
import cn.dawn.mapper.INoteDAO;
import cn.dawn.service.INoteService;
import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import javax.annotation.Resource;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* Created by Dawn on 2018/4/16.
*/
@Service("noteServiceImpl")
public class NoteServiceImpl implements INoteService{
@Resource(name = "INoteDAO")
private INoteDAO iNoteDAO;
public PageInfo<Sys_noteDetail> getOnePagenoteData(Integer pageIndex, Integer pageSize, String dname, Date startdate, Date enddate) throws Exception {
/*创建分页工具类*/
PageHelper.startPage(pageIndex, pageSize);
Map<String,Object> map=new HashMap<String,Object>();
map.put("dname",dname);
map.put("startdate",startdate);
map.put("enddate",enddate);
List<Sys_noteDetail> docs = iNoteDAO.getOnePagenoteData(map);
PageInfo<Sys_noteDetail> pageInfo = new PageInfo<>(docs);
return pageInfo;
}
}
六，讲述一下PageInfo，方便调用
//当前页
private int pageNum;
//每页的数量
private int pageSize;
//当前页的数量
private int size;
//由于startRow和endRow不常用，这里说个具体的用法
//可以在页面中"显示startRow到endRow 共size条数据"
//当前页面第一个元素在数据库中的行号
private int startRow;
//当前页面最后一个元素在数据库中的行号
private int endRow;
//总记录数
private long total;
//总页数
private int pages;
//结果集
private List<T> list;
//第一页
private int firstPage;
//前一页
private int prePage;
//是否为第一页
private boolean isFirstPage = false;
//是否为最后一页
private boolean isLastPage = false;
//是否有前一页
private boolean hasPreviousPage = false;
//是否有下一页
private boolean hasNextPage = false;
//导航页码数
private int navigatePages;
//所有导航页号
private int[] navigatepageNums;
作者：晨曦Dawn
如果上方博客有错误，或者疑惑，请指出，感激不尽！！！！！！！！！！！！！！！！
