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();
}
}