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数据库文件 d:\data\db.mdb
里面有一张表news，关键字news_id
用OleDbConnection + OleDbDataAdapter + DataSet + datalist显示数据，用AspNetPager分页控件分页，每页10条记录，该如何写程序？
我看了很多例子，可是真的看不懂！
请各位前辈帮帮忙！最简单明了的写法就行！
实在 要崩溃了！
谢谢！谢谢！谢谢指点！
你看他里面的代码啊 里面都有例子的
如果是连续自增字段的话，可以根据自增字段查询如：select * from where id>10 and id<20
如果数据量不大，可以使用DATASET如：
for(i=10;i<20;i++)
ds["table"].rows[i]["name"].tostring()
或者查询的时候利用排序和TOP关键字和子查询结合如
"select top 10 * from (select top " + 开始的记录数 +" * from tablename order by id desc) order by id asc "
学习
如果数据不是太大的话(如少于50W),用not in就行了.
select +pagesize +字段名..+from tablename where+查询条件 +排序 not in(select +pagesize*(currentpage-1) +字段名..+from tablename where+查询条件 +排序)
aspnetpager用于分页的信息就是pagesize和currentpage,所以在不能使用存储过程的情况下,以上能够简单实现.
这个是完整的分页例子..刚好完全符合你的要求OleDbConnection + OleDbDataAdapter + DataSet + datalist..呵呵...把数据库路径和字段修改下就可以了
<% @ Page Language="C#" %>
<% @ Import Namespace="System.Data" %>
<% @ Import Namespace="System.Data.OleDb" %>
<Script Language="C#" Runat="Server">
OleDbConnection MyConn;
int PageSize,RecordCount,PageCount,CurrentPage;
public void Page_Load(Object src,EventArgs e)
{
//设定PageSize
PageSize = 5;
//连接语句
string MyConnString = "Provider=Microsoft.Jet.OLEDB.4.0; Data Source="+Server.MapPath(".")+"..\\DataBase\\db1.mdb;";
MyConn = new OleDbConnection(MyConnString);
MyConn.Open();
//第一次请求执行
if(!Page.IsPostBack)
{
ListBind();
CurrentPage = 0;
ViewState["PageIndex"] = 0;
//计算总共有多少记录
RecordCount = CalculateRecord();
lblRecordCount.Text = RecordCount.ToString();
//计算总共有多少页
PageCount = RecordCount/PageSize;
lblPageCount.Text = PageCount.ToString();
ViewState["PageCount"] = PageCount;
}
}
//计算总共有多少条记录
public int CalculateRecord()
{
int intCount;
string strCount = "select count(*) as co from Score";
OleDbCommand MyComm = new OleDbCommand(strCount,MyConn);
OleDbDataReader dr = MyComm.ExecuteReader();
if(dr.Read())
{
intCount = Int32.Parse(dr["co"].ToString());
}
else
{
intCount = 0;
}
dr.Close();
return intCount;
}
ICollection CreateSource()
{
int StartIndex;
//设定导入的起终地址
StartIndex = CurrentPage*PageSize;
string strSel = "select * from Score";
DataSet ds = new DataSet();
OleDbDataAdapter MyAdapter = new OleDbDataAdapter(strSel,MyConn);
MyAdapter.Fill(ds,StartIndex,PageSize,"Score");
return ds.Tables["Score"].DefaultView;
}
public void ListBind()
{
score.DataSource = CreateSource();
score.DataBind();
lbnNextPage.Enabled = true;
lbnPrevPage.Enabled = true;
if(CurrentPage==(PageCount-1)) lbnNextPage.Enabled = false;
if(CurrentPage==0) lbnPrevPage.Enabled = false;
lblCurrentPage.Text = (CurrentPage+1).ToString();
}
public void Page_OnClick(Object sender,CommandEventArgs e)
{
CurrentPage = (int)ViewState["PageIndex"];
PageCount = (int)ViewState["PageCount"];
string cmd = e.CommandName;
//判断cmd，以判定翻页方向
switch(cmd)
{
case "next":
if(CurrentPage<(PageCount-1)) CurrentPage++;
break;
case "prev":
if(CurrentPage>0) CurrentPage--;
break;
}
ViewState["PageIndex"] = CurrentPage;
ListBind();
}
</script>
<html>
<head>
<title></title>
</head>
<body>
<form runat="server">
共有<asp:Label id="lblRecordCount" ForeColor="red" runat="server" />条记录
当前为<asp:Label id="lblCurrentPage" ForeColor="red" runat="server" />/<asp:Label id="lblPageCount" ForeColor="red" runat="server" />页
<asp:DataList id="score" runat="server"
HeaderStyle-BackColor="#aaaadd"
AlternatingItemStyle-BackColor="Gainsboro"
EditItemStyle-BackColor="yellow"
>
<ItemTemplate>
姓名：<%# DataBinder.Eval(Container.DataItem,"Name") %>
</ItemTemplate>
</asp:DataList>
<asp:LinkButton id="lbnPrevPage" Text="上一页" CommandName="prev" OnCommand="Page_OnClick" runat="server" />
<asp:LinkButton id="lbnNextPage" Text="下一页" CommandName="next" OnCommand="Page_OnClick" runat="server" />
</form>
</body>
</html>
里面的例子很容易看懂的,仔细点;另外别忽视了它下面的存储过程,少了存储过程就不能分页了.
好好学习
recordCount 属性是关键
