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分页 sql 语句 及在 asp.net 中自定义 datagrid 分页

2006-03-31 16:05 627 查看
作者: qi_jianzhou
标题: 分页 sql 语句
关键字:
分类: Sql Server
密级: 私有
[align=right](评分: , 回复: 0, 阅读: 2) »»[/align]
select top 页大小 *

from table1

where id>

(select max (id) from

(select top ((页码-1)*页大小) id from table1 order by id) as T

)

order by id

[align=right]2005-11-29 16:04:00 [/align]

修改笔记 发表评语»»»
2005-11-30 16:22:58 用 asp.net 的 dagaGrid 控件，自定义分页，速度很快
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;

namespace person
{
/// <summary>
/// dataGrid 的摘要说明。
/// </summary>
public class dataGrid : System.Web.UI.Page
{
protected System.Web.UI.WebControls.DataGrid DataGrid1;

protected int pageSize=0;
protected int pageCurrentIndex=0;
protected System.Web.UI.WebControls.Button Button1;
protected System.Web.UI.WebControls.Button Button2;
protected int pageCount=0;

private void Page_Load(object sender, System.EventArgs e)
{
// 在此处放置用户代码以初始化页面
if ( ! this.IsPostBack)
{

this.pageSize=10;
this.pageCurrentIndex=1;
this.pageCount=this.GetPageCount();
ViewState["pageSize"]=this.pageSize;
ViewState["pageCount"]=this.pageCount;
ViewState["pageCurrentIndex"]=this.pageCurrentIndex;
this.BindToDataGrid();

}

}

private int GetPageCount()
{

SqlConnection sqlcon=new SqlConnection("data source=(local);database=northwind;user id=sa;password=sa");
sqlcon.Open();
SqlCommand cmd=new SqlCommand("select count(*) from employees",sqlcon);
int i=(int)cmd.ExecuteScalar();
int j=i%this.pageSize; //取余数
int k=i / this.pageSize;//取总页数
if ( j>0) //如果余数不为 0　则表示有不满 1　页的数据　则总页数加 1
{
return k+1;
}
else
return k; //余数为0　，则正好除尽
}

private void BindToDataGrid()
{
this.pageSize=(int)ViewState["pageSize"];
this.pageCount=(int)ViewState["pageCount"];
this.pageCurrentIndex=(int)ViewState["pageCurrentIndex"];

int recordCount=this.pageSize*(this.pageCurrentIndex-1);

string sql;

if ( recordCount==0)
{
sql="select top "+this.pageSize.ToString()
+" * from employees";
}
else
{

sql="select top "+this.pageSize.ToString()
+" * from employees where employeeid>"
+" ( select max(employeeid) from "
+" (select top "+Convert.ToString(recordCount)+" * "
+" from employees order by employeeid) as t) order by employeeid";
}
SqlConnection sqlcon=new SqlConnection("data source=(local);database=northwind;user id=sa;password=sa");
sqlcon.Open();
SqlDataAdapter sda=new SqlDataAdapter(sql,sqlcon);
DataSet ds=new DataSet();
sda.Fill(ds,"employees");

this.DataGrid1.DataSource=ds.Tables["employees"].DefaultView;
this.DataGrid1.DataBind();

}

#region Web 窗体设计器生成的代码
override protected void OnInit(EventArgs e)
{
//
// CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
//
InitializeComponent();
base.OnInit(e);
}

/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.Button1.Click += new System.EventHandler(this.Button1_Click);
this.Button2.Click += new System.EventHandler(this.Button2_Click);
this.Load += new System.EventHandler(this.Page_Load);

}
#endregion

private void Button1_Click(object sender, System.EventArgs e)
{
this.pageCurrentIndex=(int)ViewState["pageCurrentIndex"];
this.pageCount=(int)ViewState["pageCount"];
this.pageSize=(int)ViewState["pageSize"];

this.pageCurrentIndex-=1;
ViewState["pageCurrentIndex"]=this.pageCurrentIndex;
// ViewState["pageCount"]=this.pageCount;
// ViewState["pageSize"]=this.pageSize;
this.BindToDataGrid();

}

private void Button2_Click(object sender, System.EventArgs e)
{
this.pageCurrentIndex=(int)ViewState["pageCurrentIndex"];
this.pageCount=(int)ViewState["pageCount"];
this.pageSize=(int)ViewState["pageSize"];

this.pageCurrentIndex+=1;
ViewState["pageCurrentIndex"]=this.pageCurrentIndex;
// ViewState["pageCount"]=this.pageCount;
// ViewState["pageSize"]=this.pageSize;
this.BindToDataGrid();

}
}
}
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