Paging & Advanced Search

Paging

True Page

Click on a night to that data, we use range queries

Select * from jobs where ... limit 0,3

 

Fake page

We check out all the data, into memory

 Paging implementation:

We created a pagination tools,

Package Penalty for cn.jiedada.util; 

Import java.util.List; 

/ ** This is a do into paging, the current page, next page, previous page, total pages, last page, page, each page size, 
 * the current page directly 
 * calculate the total number of pages 
        this.totalPage = this.totalNum% pageSize == 0 this.totalNum / pageSize:? this.totalNum / pageSize + 1; 
        before calculate a 
        this.prePage = this.localPage == 1 1:? this.localPage-1 ; 
        calculated after a 
        this.nextPage = this.localPage == this.totalPage this.totalPage:? this.localPage +. 1; 
 * @author  
 * 
 * @param <T>
  * / 
public  class PageBeanUtil <T> { 
    
    Private Integer localPage;
     //Pages 
    Private Integer TotalPage;
     // Per page 
    Private Integer = the pageSize. 5 ;
     // total data amount 
    Private Integer totalnum;
     // Home 
    Private Integer = firstPage. 1 ;
     // Previous 
    Private Integer prePage;
     // next page 
    Private Integer nextPage;
     // End 
    Private Integer lastPage;
     // display data 
    Private List <T> List; 

    public PageBeanUtil () { 
    } 

    public PageBeanUtil(Integer localPage,Integer totalNum) {
        super();
        this.localPage = localPage;
        this.totalNum = totalNum;
        //算出总页数
        this.totalPage = this.totalNum%pageSize==0?this.totalNum/pageSize:this.totalNum/pageSize+1;
        //算出前一页
        this.prePage = this.localPage==1? 1 : this.localPage-1;
        //算出后一页
        this.nextPage = this.localPage==this.totalPage? this.totalPage : this.localPage+1;
        
        this.lastPage = this.totalPage;
    }

    public Integer getLocalPage() {
        return localPage;
    }

    public void setLocalPage(Integer localPage) {
        this.localPage = localPage;
    }

    public Integer getTotalPage() {
        return totalPage;
    }

    public void setTotalPage(Integer totalPage) {
        this.totalPage = totalPage;
    }

    public Integer getPageSize() {
        return pageSize;
    }

    public void setPageSize(Integer pageSize) {
        this.pageSize = pageSize;
    }

    public Integer getTotalNum() {
        return totalNum;
    }

    public void setTotalNum(Integer totalNum) {
        this.totalNum = totalNum;
    }

    public Integer getFirstPage() {
        return firstPage;
    }

    public void setFirstPage(Integer firstPage) {
        this.firstPage = firstPage;
    }

    public Integer getPrePage() {
        return prePage;
    }

    public void setPrePage(Integer prePage) {
        this.prePage = prePage;
    }

    public Integer getNextPage() {
        return nextPage;
    }

    public void setNextPage(Integer nextPage) {
        this.nextPage = nextPage;
    }

    public Integer getLastPage() {
        return lastPage;
    }

    public void setLastPage(Integer lastPage) {
        this.lastPage = lastPage;
    }

    public List<T> getList() {
        return list;
    }

    public void setList(List<T> list) {
        this.list = list;
    }

    @Override
    public String toString() {
        return "PageBeanUtil [localPage=" + localPage + ", totalPage=" + totalPage + ", pageSize=" + pageSize
                + ", totalNum=" + totalNum + ", firstPage=" + firstPage + ", prePage=" + prePage + ", nextPage="
                + nextPage + ", lastPage=" + lastPage + ", list=" + list + "]";
    }
    
    
}

View Code

By constructing this method inside, will be able to directly encapsulated into an object, which can be obtained by calculating this, but tolalNum that we need to query the database

In the service layer, we do statement

@Override
    public PageBeanUtil<Jobs> page(Integer localPage) {
                //查询中条数
        Integer totalNum = dao.findNum();
        if(localPage==null){
            localPage=1;
        }
        //构造方法
        PageBeanUtil<Jobs> pageBean = new PageBeanUtil<Jobs>(localPage, totalNum);
        //查询
        List<Jobs> list = dao.selectLimt((localPage-1)*pageBean.getPageSize(),pageBean.getPageSize());
        pageBean.setList(list);
        return pageBean;
    }            

View Code

@Override
    public Integer findNum() {
        return template.queryForObject("select count(id) from jobs", Integer.class);
    }

    @Override
    public List<Jobs> selectLimt(int index, Integer pageSize) {
        // TODO Auto-generated method stub
        return template.query("SELECT * FROM view_jobs_city LIMIT ?,?", new BeanPropertyRowMapper<Jobs>(Jobs.class),index,pageSize);
    }

View Code

This is the dao layer

 

 

<div class = "Container Job-Table"> 
            <Table class = "Table Table-hover"> 
                <TR> 
                    <TH class = "hidden-SM"> ID </ TH> 
                    <TH> job </ TH> 
                    < th> Location </ th> 
                    <th> number </ th> 
                    <th> salary </ th> 
                    <th> is enabled </ th> 
                    <th> Name </ th> 
                    <th> operating </ th> 
                </ TR> 
                <C: forEach items = "$ {} pageBean.list" var = "J">
                    <tr>
                        <th>#${j.id }</th>
                        <th>${j.title }</th>
                        <th>${j.cname }</th>
                        <th>${j.jobnum }</th>
                        <th>${j.treatment }</th>
                        <th>
                            <c:if test="${j.isenabled }" var="s">    
                                <span class="glyphicon glyphicon-ok" aria-hidden="true"></span>
                            </c:if>
                            <c:if test="${!s }">
                                <span class="glyphicon glyphicon-remove" cia-hidden="true"></span>
                            </c:if>
                        </th>
                        <th>${j.inputdate }</th>
                        <th>
                            <a href="system/jobs/update?id=${j.id }" class="btn-default tableA"><span class="glyphicon glyphicon-pencil" aria-hidden="true">修改</span></a>
                            <a href="system/jobs/del?id=${j.id }" class="btn-default tableA"><span class="glyphicon glyphicon-trash" aria-hidden="true">删除</span></a>
                        </th>
                    </tr>
                </c:forEach>
            </table>
            <!--分页-->
            <nav class="navbar-right">
                <ul class="pagination" id="paging">
                    <li>
                        <span>当前第${pageBean.localPage }页</span>
                    </li>
                    <li>
                        <a href="system/jobs/page?localPage=1">
                            <span aria-hidden="true">首页</span>
                        </a>
                    </li>
                    <li>
                        <a href="system/jobs/page?localPage=${pageBean.prePage }" aria-label="上一页">
                            <span aria-hidden="true"> Previous </ span> 
                    <Li>
                        </a>
                    </li>

                    </li>
                    <li>
                        <a href="system/jobs/page?localPage=${pageBean.nextPage }" aria-label="下一页">
                            <span aria-hidden="true">下一页</span>
                        </a>
                    </li>
                    <li>
                        <a href="system/jobs/page?localPage=${pageBean.lastPage }" aria-label="尾页">
                            <span aria-hidden="true">尾页</span>
                        </a>
                    </li>
                    <li>
                        <span> Total Number of pages: page $ {pageBean.totalPage} </ span>
                        <span> Total Data: Total $ {pageBean.totalNum} article </ span> 
                </ UL>
                    </ Li> 
            </ NAV> 
        </ div> 
    </ body>

View Code

 

This is the front page of data feedback

 

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