SpringBoot to do more to integrate PageHelper conditions paging query

https://yq.aliyun.com/articles/619586

 

How about this blog integration PageHelper in SpringBoot, how to achieve with multiple conditions and PageInfo attributes in Chinese interpretation (translation)

A, jar package

 

        <!-- 分页插件 -->
        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper-spring-boot-starter</artifactId>
            <version>1.2.3</version>
        </dependency>

 

 

Second, the registration Configuration Plug

 

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;
    }
}

 

Three, dao layer interface

 

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;


}

 

　　Paging is best to do with the conditions Map, are particularly vulnerable because of the integration of smart labels, its multi-condition is passed in Map

Four, dao layer disposed xml

 

<?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&gt;=#{startdate}
            </if>
            <if test="enddate!= null and enddate!=''">
                AND dentrytime&lt;=#{enddate}
            </if>
        </where>
    </select>


</mapper>

 

Fifth, call PageHelper, actually using it

 

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;

    }

}

 

Sixth, talk about PageInfo, easy call

 

    // this page   
    Private int pageNum;   
    // page number of   
    private int pageSize;   
    the number of the current page //   
    Private int size;   
    // Since startRow and endRow unusual, to say the specific usage here   
    // can be in the page " startRow to display endRow total size of data "   
  
    // current page number of the first element row in the database   
    private int startRow;   
    // this last element in the page line number in the database   
    private int endRow;   
    // record the total number of   
    private total Long;   
    // pages   
    Private pages int;   
    // result set   
    Private List <T> List;   
  
    // first   
    Private int firstPage;   
    // Previous   
    Private int prePage;   
  
    // whether the first page  
    boolean = false isFirstPage Private;   
    // whether the last page of the   
    Private isLastPage boolean = false;   
    // Are there previous page   
    Private hasPreviousPage boolean = false;   
    // if there Next   
    Private hasNextPage boolean = false;   
    // navigation page number   
    int navigatePages Private;   
    // all navigation page number   
    private int [] navigatepageNums;