ASP.NET存储过程自定义分页详解 - 源本英明C的博客

作者在 2010-06-05 09:35:26 发布以下内容

CREATE proc getdataset
@TableList Varchar(200)='*',--搜索表的字段,比如：’id，datatime，job‘，用逗号隔开
@TableName Varchar(30), --搜索的表名
@SelectWhere Varchar(500)='',--搜索条件，这里不用写where，比如：job=’teacher‘and class='2'
@SelectOrderId Varchar(20),--表主键字段名。比如：id
@SelectOrder Varchar(200)='', --排序，可以使用多字段排序但主键字段必需在最前面.也可以不写，比如：order by class asc
@intPageNo int=1, --页号
@intPageSize int=10 ,--每页显示数
@RecordCount int OUTPUT  --总记录数(存储过程输出参数)
as

declare @TmpSelect    NVarchar(600)
declare @Tmp    NVarchar(600)

set nocount on--关闭计数

set @TmpSelect = 'select @RecordCount = count(*) from '+@TableName+' '+@SelectWhere

execute sp_executesql
@TmpSelect, --执行上面的sql语句
N'@RecordCount int OUTPUT' , --执行输出数据的sql语句，output出总记录数
@RecordCount  OUTPUT

  if (@RecordCount = 0) --如果没有贴子，则返回零
   return 0

/*判断页数是否正确*/
  if (@intPageNo - 1) * @intPageSize > @RecordCount --页号大于总页数，返回错误
   return (-1)
set nocount off--打开计数
if @SelectWhere != ''
begin
set @TmpSelect = 'select top '+str(@intPageSize)+' '+@TableList+' from '+@TableName+' where '+@SelectOrderId+' not in(select top '+str((@intPageNo-1)*@intPageSize)+' '+@SelectOrderId+' from '+@TableName+' '+@SelectWhere +' '+@SelectOrder+') and '+@SelectWhere +' '+@SelectOrder
end
else
begin
set @TmpSelect = 'select top '+str(@intPageSize)+' '+@TableList+' from '+@TableName+' where '+@SelectOrderId+' not in(select top '+str((@intPageNo-1)*@intPageSize)+' '+@SelectOrderId+' from '+@TableName+' '+@SelectOrder+') '+@SelectOrder
end
execute sp_executesql @TmpSelect
return(@@rowcount)
GO

其实代码也很简单，学编程的人基本上都是懂数据库的，这个存储过程估计不是问题。
其他的代码我都做了解释，有颜色的那段我没有解释，我在这里解释一下。其实也很简单，大家来看：
select top '+str((@intPageNo-1)*@intPageSize)+' '+@SelectOrderId+' from '+@TableName+' '+@SelectWhere +' '+@SelectOrder+'
这段代码的执行结果是什么了，是不是当前页前面的主键的集合啊，现在我们从所有的表中选出主键的值不在这个结果的之内的pagesize个记录不就是当前页的内容了吗？
2.aspx页面就不用再将了吧？我这里将代码写上：

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="aa.aspx.cs" Inherits="_Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>无标题页</title>
</head>
<body>
<form id="form1" runat="server">
<div>
      <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" Height="180px" Width="867px">
         <Columns>
            <asp:BoundField DataField="job_id" HeaderText="job_id" />
            <asp:BoundField DataField="job_desc" HeaderText="job_desc" />
            <asp:BoundField DataField="max_lvl" HeaderText="max_lxl" />
         </Columns>
      </asp:GridView>

</div>
        <asp:HyperLink ID="hylfirst" runat="server">首页</asp:HyperLink>

      <asp:HyperLink ID="hylprev" runat="server">上一页</asp:HyperLink>

      <asp:HyperLink ID="hylnext" runat="server">下一页</asp:HyperLink>
      <asp:HyperLink ID="hylend" runat="server">尾页</asp:HyperLink>
        第<asp:Label ID="lbRow" runat="server" Text="Label"></asp:Label>页，
        共<asp:Label ID="lbpage" runat="server" Text="Label"></asp:Label>页，共<asp:Label
         ID="lbRecord" runat="server" Text="Label"></asp:Label>条记录，转到<asp:TextBox ID="txtlink"
            runat="server" Width="29px"></asp:TextBox>
      页<asp:LinkButton ID="link" runat="server" OnClick="link_Click" TabIndex="1">转到</asp:LinkButton>
</form>
</body>
</html>

3.cs页面其实也每页什么好讲的，也就是一些常用的代码罢了……我把代码加上，大家看看，要是有疑问的可以回复我再解释：

using System;
using System.Data;
using System.Configuration;
using System.Collections;
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.Data.SqlClient;

public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{

      this.bind();

}

protected void link_Click(object sender, EventArgs e)
{
      int page = Convert.ToInt32(txtlink.Text);
      Response.Redirect("aa.aspx?CurrentPage="+page+"");
}
public void bind()
{
      int sumPage;
      int pageNo = 1;
      int pageSize = 3;
      if (Request.QueryString["CurrentPage"] == null)
      {
         pageNo = 1;
      }
      else
      {
         pageNo = Int32.Parse(Request.QueryString["CurrentPage"]);
      }

      SqlConnection conn = new SqlConnection(ConfigurationManager.AppSettings["ConStr"]);
      SqlDataAdapter da = new SqlDataAdapter();
      da.SelectCommand = new SqlCommand();
      da.SelectCommand.Connection = conn;
      da.SelectCommand.CommandText = "getdataset";
      da.SelectCommand.CommandType = CommandType.StoredProcedure;
      da.SelectCommand.Parameters.Add("@TableList", SqlDbType.VarChar, 200).Value = "job_id,job_desc,max_lvl";
      da.SelectCommand.Parameters.Add("@TableName", SqlDbType.VarChar, 30).Value = "jobs";
      //da.SelectCommand.Parameters.Add("@SelectWhere", SqlDbType.VarChar, 500).Value = "where d=1";
      da.SelectCommand.Parameters.Add("@SelectOrderId", SqlDbType.VarChar, 20).Value = "job_id";
      da.SelectCommand.Parameters.Add("@SelectOrder", SqlDbType.VarChar, 200).Value = "order by min_lvl asc";
      da.SelectCommand.Parameters.Add("@intPageNo", SqlDbType.Int).Value = pageNo;
      da.SelectCommand.Parameters.Add("@intPageSize", SqlDbType.Int).Value = pageSize;
      da.SelectCommand.Parameters.Add("@RecordCount", SqlDbType.Int).Direction = ParameterDirection.Output;
      da.SelectCommand.Parameters.Add("RowCount", SqlDbType.Int).Direction = ParameterDirection.ReturnValue;
      DataSet ds = new DataSet();
      da.Fill(ds, "jobs");
      GridView1.DataSource = ds;
      GridView1.DataBind();
      Int32 RecordCount = (Int32)da.SelectCommand.Parameters["@RecordCount"].Value; //求出总记录数，该值是output出来的值
      Int32 RowCount = (Int32)da.SelectCommand.Parameters["RowCount"].Value;       //求出当前页中的记录数，在最后一页不等于pagesize，
      lbRecord.Text = RecordCount.ToString();
      lbRow.Text = pageNo.ToString();
      sumPage = (Int32)RecordCount / pageSize;
      if (RecordCount % pageSize > 0)
      {
         sumPage = sumPage + 1;
      }
      lbpage.Text = sumPage.ToString();
      if (pageNo > 1)
      {
         hylfirst.NavigateUrl = "aa.aspx?CurrentPage=1";
         hylprev.NavigateUrl = string.Concat("aa.aspx?CurrentPage=", "", pageNo - 1);
      }
      else
      {
         hylprev.NavigateUrl = "";
         hylfirst.NavigateUrl = "";
         hylfirst.Visible = false;
         hylprev.Visible = false;
      }
      if (pageNo < sumPage)
      {
         hylend.NavigateUrl = string.Concat("aa.aspx?CurrentPage=", "", sumPage);
         hylnext.NavigateUrl = string.Concat("aa.aspx?CurrentPage=", "", pageNo + 1);
      }
      else
      {
         hylnext.NavigateUrl = "";
         hylend.NavigateUrl = "";
         hylend.Visible = false;
         hylnext.Visible = false;
      }

}
}