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access下的分页方案(仿sql存储过程)

using system; using system.collections.generic; using system.text; using system.data; using system.data.oledb; using system.web; /**//// summary /// 名称:access下的分页方案(仿sql存储过程) /// 作者:cncxz(虫虫) /// blog: http://cncxz.cn
using system;
using system.collections.generic;
using system.text;
using system.data;
using system.data.oledb;
using system.web;
/**////
/// 名称:access下的分页方案(仿sql存储过程)
/// 作者:cncxz(虫虫)
/// blog:http://cncxz.cnblogs.com
///
public class adopager
{
    protected string m_connstring;
    protected oledbconnection m_conn;
    public adopager()
    {
        createconn(string.empty);
    }
    public adopager(string dbpath)
    {
        createconn(dbpath);
    }
    private void createconn(string dbpath)
    {
        if (string.isnullorempty(dbpath))
        {
            string str = system.configuration.configurationmanager.appsettings[dbpath] as string;
            if (string.isnullorempty(str))
                str = ~/app_data/db.mdb;
            m_connstring = string.format(@provider=microsoft.jet.oledb.4.0;data source={0}, httpcontext.current.server.mappath(str));
        }
        else
            m_connstring = string.format(@provider=microsoft.jet.oledb.4.0;data source={0}, dbpath);
        m_conn = new oledbconnection(m_connstring);
    }
    /**////
    /// 打开连接
    ///
    public void connopen()
    {
        if (m_conn.state != connectionstate.open)
            m_conn.open();
    }
    /**////
    /// 关闭连接
    ///
    public void connclose()
    {
        if (m_conn.state != connectionstate.closed)
            m_conn.close();
    }
    private string recordid(string query, int passcount)
    {
        oledbcommand cmd = new oledbcommand(query, m_conn);
        string result = string.empty;
        using (idatareader dr = cmd.executereader())
        {
            while (dr.read())
            {
                if (passcount                 {
                    result += , + dr.getint32(0);
                }
                passcount--;
            }
        }
        return result.substring(1);
    }
/**////
    /// 获取当前页应该显示的记录,注意:查询中必须包含名为id的自动编号列,若不符合你的要求,就修改一下源码吧 :)
    ///
    /// 当前页码
    /// 分页容量
    /// 显示的字段
    /// 查询字符串,支持联合查询
    /// 查询条件,若有条件限制则必须以where 开头
    /// 排序规则
    /// 传出参数:总页数统计
    /// 传出参数:总记录统计
    /// 装载记录的datatable
    public datatable executepager(int pageindex, int pagesize, string showstring, string querystring, string wherestring, string orderstring, out int pagecount, out int recordcount)
    {
        if (pageindex         if (pagesize         if (string.isnullorempty(showstring)) showstring = *;
        if (string.isnullorempty(orderstring)) orderstring = id desc;
        connopen();
        string myvw = string.format( ( {0} ) tempvw , querystring);
        oledbcommand cmdcount = new oledbcommand(string.format( select count(0) as recordcount from {0} {1}, myvw, wherestring), m_conn);
        recordcount = convert.toint32(cmdcount.executescalar());
        if ((recordcount % pagesize) > 0)
            pagecount = recordcount / pagesize + 1;
        else
            pagecount = recordcount / pagesize;
        oledbcommand cmdrecord;
        if (pageindex == 1)//第一页
        {
            cmdrecord = new oledbcommand(string.format(select top {0} {1} from {2} {3} order by {4} , pagesize, showstring, myvw, wherestring, orderstring), m_conn);
        }
        else if (pageindex > pagecount)//超出总页数
        {
            cmdrecord = new oledbcommand(string.format(select top {0} {1} from {2} {3} order by {4} , pagesize, showstring, myvw, where 1=2, orderstring), m_conn);
        }
        else
        {
            int pagelowerbound = pagesize * pageindex;
            int pageupperbound = pagelowerbound - pagesize;
            string recordids = recordid(string.format(select top {0} {1} from {2} {3} order by {4} , pagelowerbound, id, myvw, wherestring, orderstring), pageupperbound);
            cmdrecord = new oledbcommand(string.format(select {0} from {1} where id in ({2}) order by {3} , showstring, myvw, recordids, orderstring), m_conn);
        }
        oledbdataadapter dataadapter = new oledbdataadapter(cmdrecord);
        datatable dt=new datatable();
        dataadapter.fill(dt);
        connclose();
        return dt;
    }
}
还有调用示例:html代码
分页演示
转到第1页
示例的codebehind代码
using system;
using system.data;
using system.configuration;
using system.web;
using system.web.security;
using system.web.ui;
using system.web.ui.webcontrols;
using system.web.ui.webcontrols.webparts;
using system.web.ui.htmlcontrols;
using system.collections.generic;
public partial class _default : system.web.ui.page
{
    private adopager mm_pager;
    protected adopager m_pager
    {
        get{
            if (mm_pager == null)
                mm_pager = new adopager();
            return mm_pager;
        }
    }
    protected void page_load(object sender, eventargs e)
    {
        if(!ispostback)
            loaddata();
    }
    private int pageindex = 1;
    private int pagesize = 20;
    private int pagecount = -1;
    private int recordcount = -1;
    private void loaddata()
    {
        string strquery = select a.*,b.kindtext from tabletest a left join tablekind b on a.kindcode=b.kindcode ;
        string strshow = id,subject,kindcode,kindtext;
datatable dt = m_pager.executepager(pageindex, pagesize, strshow, strquery, , id desc, out pagecount, out recordcount);
        gridview1.datasource = dt;
        gridview1.databind();
        label1.text = string.format(共{0}条记录,每页{1}条,页次{2}/{3},recordcount,pagesize,pageindex,pagecount);
    }
protected void btnjump_click(object sender, eventargs e)
    {
        int.tryparse(txtpagesize.text, out pageindex);
        loaddata();
    }
}
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