Mysql分页、SSM项目分页实战
2022/10/17 1:23:58
本文主要是介绍Mysql分页、SSM项目分页实战,对大家解决编程问题具有一定的参考价值,需要的程序猿们随着小编来一起学习吧!
一、Mysql分页
记住几个万年不变的公式就完了
(1)limit分页公式:limit (curPage-1)*pageSize,pageSize curPage是当前第几页;pageSize是一页多少条记录 sql语句: select * from student limit (curPage-1)*pageSize,pageSize;
(2)总页数公式: int totalPageNum = (totalRecord +pageSize - 1) / pageSize; totalRecord是总记录数;pageSize是一页分多少条记录
(3)总记录数: count( * ) sql语句: select count( * ) from student;
二、SSM项目分页实战
1、首先,我们先准备一个分页用到的工具类
public class PageUtil<T> { private int pageIndex;//当前页码 private int pageSize; //页面大小 private int totalcount; //总条数 private int pageCount; //总页数 private List<T> records; //分页的数据 private int numberStart; //开始序号 private int numberEnd; //结束序号 private List<Integer> numbers=new ArrayList<Integer>(); //序号 public PageUtil(int pageIndex, int pageSize, int totalcount, List<T> records) { this.pageIndex = pageIndex; this.pageSize = pageSize; this.totalcount = totalcount; this.records = records; //人工计算总页数 this.pageCount=(this.totalcount%this.pageSize==0)?(this.totalcount/this.pageSize):(this.totalcount/this.pageSize+1); //给序号赋值 if(this.pageCount<=10){ this.numberStart=1; this.numberEnd=this.pageCount; }else{ this.numberStart=this.pageIndex-4; this.numberEnd=this.pageIndex+5; if(this.numberStart<1){ this.numberStart=1; this.numberEnd=10; } if(this.numberEnd>this.pageCount){ this.numberStart=this.pageCount-9; this.numberEnd=this.pageCount; } } for(int i=numberStart;i<=numberEnd;i++){ numbers.add(i); } } public int getPageIndex() { return pageIndex; } public void setPageIndex(int pageIndex) { this.pageIndex = pageIndex; } public int getPageSize() { return pageSize; } public void setPageSize(int pageSize) { this.pageSize = pageSize; } public int getTotalcount() { return totalcount; } public void setTotalcount(int totalcount) { this.totalcount = totalcount; } public int getPageCount() { return pageCount; } public void setPageCount(int pageCount) { this.pageCount = pageCount; } public List<T> getRecords() { return records; } public void setRecords(List<T> records) { this.records = records; } public int getNumberStart() { return numberStart; } public void setNumberStart(int numberStart) { this.numberStart = numberStart; } public int getNumberEnd() { return numberEnd; } public void setNumberEnd(int numberEnd) { this.numberEnd = numberEnd; } public List<Integer> getNumbers() { return numbers; } public void setNumbers(List<Integer> numbers) { this.numbers = numbers; } }
2、看一下我们数据库的数据
3、运行我们的SSM项目,打开页面,请求Controller
4、看一下,我们的Controller
5、Service层就不带大家看了,直接来到持久层
6、返回到我们的页面,主要看参数那一块是怎么取值的,这个SSM项目没有用到Jsp页面,用到的是thymeleaf模板
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