数据库： SqlServer 2000, 数据源：系统自带的 Northwind
操作系统： Window XP 中文版
开发平台： .Net Framework 1.1, C# 语言
效果预览： 
好了，让我们开始奇异的 Datagrid 之旅吧：
先在数据库中定义存储过程，轻易实现百万级数据分页：
//@PageSize：分页大小，PageIndex：页号，@PageCount：总页数，@recordCount：记录数
CREATE PROCEDURE GetCustomDataPage @pageSize int , @pageIndex int , @pageCount int output , @recordCount int output AS
declare @SQL varchar(1000)
select @recordCount= count(*) from products
set @pageCount= ceiling (@recordCount*1.0/@pageSize)
if @pageIndex = 0 or @pageCount<=1
set @SQL= 'select top ' + str (@pageSize)+ ' productID,productName, unitPrice from products order by productID asc'
else if @pageIndex = @pageCount -1
set @SQL= 'select * from ( select top ' + str (@recordCount - @pageSize * @pageIndex)+ ' productID,productName, unitPrice from products order by productID desc) TempTable order by productID asc'
else set @SQL= 'select top ' + str (@pageSize) + ' * from ( select top ' + str (@recordCount - @pageSize * @pageIndex)+ ' productID,productName, unitPrice from products order by productID desc) TempTable order by productID asc'
exec (@SQL)
GO
好了，存储过程建好了，那么如何在 .Net 中使用呢？请看以下代码：
private uint pageCount; //总页数
private uint recordCount; //总记录数
private DataSet GetPageData( uint pageSize, uint pageIndex)
{
string strConn = System.Configuration.ConfigurationSettings.AppSettings["ConnectionString"];
SqlConnection conn = new SqlConnection(strConn);
conn.Open();
SqlCommand command = new SqlCommand("GetCustomDataPage",conn); //第一个参数为存储过程名
command.CommandType = CommandType.StoredProcedure; //声明命令类型为存储过程
command.Parameters.Add("@pageSize",SqlDbType.Int);
command.Parameters["@pageSize"].Value = pageSize;
command.Parameters.Add("@pageIndex",SqlDbType.Int);
command.Parameters["@pageIndex"].Value = pageIndex;
command.Parameters.Add("@pageCount",SqlDbType.Int);
command.Parameters["@pageCount"].Value = pageCount;
command.Parameters["@pageCount"].Direction = ParameterDirection.Output; //存储过程中的输出参数
command.Parameters.Add("@recordCount",SqlDbType.Int);
command.Parameters["@recordCount"].Value = recordCount;
command.Parameters["@recordCount"].Direction = ParameterDirection.Output; //存储过程中的输出参数
SqlDataAdapter adapter = new SqlDataAdapter(command);
DataSet ds = new DataSet();
adapter.Fill(ds);
//获得输出参数值
pageCount = Convert.ToUInt32(command.Parameters["@pageCount"].Value);
recordCount = Convert.ToUInt32(command.Parameters["@recordCount"].Value);
conn.Close();
return ds;
}
//绑定数据到DataGrid中
private void BindDataGrid()
{
DataSet ds = GetPageData(( uint )dgProduct.PageSize,( uint )dgProduct.CurrentPageIndex);
dgProduct.VirtualItemCount = ( int )recordCount;
dgProduct.DataSource = ds;
dgProduct.DataBind();
}
//页面加载时就绑定DataGrid
private void Page_Load( object sender, System.EventArgs e)
{
if (!Page.IsPostBack)
{
BindDataGrid();
}
}
//用户翻页时事件处理
private void dgProduct_PageIndexChanged( object source, System.Web.UI.WebControls.DataGridPageChangedEventArgs e)
{
dgProduct.CurrentPageIndex = e.NewPageIndex;
BindDataGrid();
}
//用户单击编辑按纽时事件处理
private void dgProduct_EditCommand( object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
{
dgProduct.EditItemIndex = e.Item.ItemIndex;
BindDataGrid();
}
//用户单击取消按纽时事件处理
private void dgProduct_CancelCommand( object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
{
dgProduct.EditItemIndex = -1;
BindDataGrid();
}
//用户单击更新按纽时事件处理
private void dgProduct_UpdateCommand( object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
{
string strConn = System.Configuration.ConfigurationSettings.AppSettings["ConnectionString"];
SqlConnection conn = new SqlConnection(strConn);
conn.Open();
//string strSQL = "update from products set productName=@productName, set unitPrice=@unitPrice where productID=@productID";
string strSQL = "update products set productName=@productName where productID=@productID";
SqlCommand command = new SqlCommand(strSQL,conn);
command.Parameters.Add("@productName",SqlDbType.NVarChar,40);
command.Parameters["@productName"].Value = ((TextBox)(e.Item.Cells[1].Controls[0])).Text.Trim();
//command.Parameters.Add("@unitPrice",SqlDbType.Int);
//command.Parameters["@unitPrice"].Value = Convert.ToInt32(((TextBox)(e.Item.Cells[2].Controls[0])).Text.Trim());
command.Parameters.Add("@productID",SqlDbType.Int);
command.Parameters["@productID"].Value = dgProduct.DataKeys[e.Item.ItemIndex];
command.ExecuteNonQuery();
conn.Close();
dgProduct.EditItemIndex = -1;
BindDataGrid();
}
//用户单击删除按纽时事件处理
private void dgProduct_DeleteCommand( object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
{
string strConn = System.Configuration.ConfigurationSettings.AppSettings["ConnectionString"];
SqlConnection conn = new SqlConnection(strConn);
conn.Open();
SqlCommand command = new SqlCommand("DeleteProduct",conn);
command.CommandType = CommandType.StoredProcedure;
command.Parameters.Add("@productID",SqlDbType.Int);
command.Parameters["@productID"].Value = dgProduct.DataKeys[e.Item.ItemIndex];
command.ExecuteNonQuery();
BindDataGrid();
}
//实现删除确认及颜色交替显示功能
private void dgProduct_ItemDataBound( object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)
{
if (e.Item.ItemType == ListItemType.Item ||e.Item.ItemType == ListItemType.AlternatingItem)
{
Button btnDelete = (Button)(e.Item.Cells[4].Controls[0]);
btnDelete.Attributes.Add("onClick","JavaScript:return confirm('确定删除？')");
e.Item.Attributes.Add("onMouseOver","this.style.backgroundColor='#FFCC66'");
e.Item.Attributes.Add("onMouseOut","this.style.backgroundColor='#ffffff'");
}
}