page.cs

一个简单的网上书店

using System;
using System.Collections.Generic;
using System.Text;

namespace Model
{
    public class Page
    {
        private int totalRows; // 总行数

        private int pageSize = 5; // 每页显示的行数

        private int currentPage = 1; // 当前页号

        private int totalPages; // 总页数

        private int startRow; // 当前页在数据库中的起始行


        /**
 * 构造方法: 功能计算总页数
 * 
 * @param _totalRows
 */
        public Page(int _totalRows)
        {
            totalRows = _totalRows;
            totalPages = totalRows / pageSize;
            int mod = totalRows % pageSize;
            if (mod > 0)
            {
                totalPages++;
            }
            // TODO Auto-generated constructor stub
        }

        /**
         * @return the currentPage
         */
        public int getCurrentPage()
        {
            return currentPage;
        }

        /**
         * @param currentPage
         *            the currentPage to set
         */
        public void setCurrentPage(int currentPage)
        {
            this.currentPage = currentPage;
        }

        /**
         * @return the pageSize
         */
        public int getPageSize()
        {
            return pageSize;
        }

        /**
         * @param pageSize
         *            the pageSize to set
         */
        public void setPageSize(int pageSize)
        {
            this.pageSize = pageSize;
        }

        /**
         * @return the startRow
         */
        public int getStartRow()
        {
            return startRow;
        }

        /**
         * @param startRow
         *            the startRow to set
         */
        public void setStartRow(int startRow)
        {
            this.startRow = startRow;
        }

        /**
         * @return the totalPages
         */
        public int getTotalPages()
        {
            return totalPages;
        }

        /**
         * @param totalPages
         *            the totalPages to set
         */
        public void setTotalPages(int totalPages)
        {
            this.totalPages = totalPages;
        }

        /**
         * @return the totalRows
         */
        public int getTotalRows()
        {
            return totalRows;
        }

        /**
         * @param totalRows
         *            the totalRows to set
         */
        public void setTotalRows(int totalRows)
        {
            this.totalRows = totalRows;
        }

        /**
         * first()功能描述:返回首页
         */
        public void first()
        {
            currentPage = 1;
            startRow = 0;
        }
        /**
         * previous()功能描述:上一页
         */
        public void previous()
        {
            if (currentPage == 1)
            {
                return;
            }
            currentPage--;
            startRow = (currentPage - 1) * pageSize;
        }
        /**
         * next()功能描述:下一页
         */
        public void next()
        {
            if (currentPage < totalPages)
            {
                currentPage++;
            }
            startRow = (currentPage - 1) * pageSize;
        }
        /**
         * last()功能描述:尾页
         */
        public void last()
        {
            currentPage = totalPages;
            startRow = (currentPage - 1) * pageSize;
        }
        /**
         * refresh()功能描述:根据页码,进行跳转
         */
        public void refresh(int _currentPage)
        {
            currentPage = _currentPage;
            startRow = (currentPage - 1) * pageSize;
            if (currentPage > totalPages)
            {
                last();
            }
        }
    }
}