用于GridView自定义分页的几种存储过程写法_[Asp.Net教程]

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The author:(作者)归海一刀
published in(发表于) 2014/1/30 1:57:22
用于GridView自定义分页的几种存储过程写法_[Asp.Net教程]

用于GridView自定义分页的几种存储过程写法_[Asp.Net教程]
使用存储过程对GridView进行分页的4种写法(分别是使用Top关键字，临时表，临时表变量和SQL Server 2005 新加的Row_Number()函数)

if exists(select 1 from sys.objects where name = ’GetProductsCount’ and type = ’P’)
drop proc GetProductsCount
go
CREATE PROCEDURE GetProductsCount
as
select count(*) from products
go

1.使用Top

if exists(select 1 from sys.objects where name = ’GetProductsByPage’ and type = ’P’)
drop proc GetProductsByPage
go
CREATE PROCEDURE GetProductsByPage
@PageNumber int,
@PageSize int
AS
declare @sql nvarchar(4000)
set @sql = ’select top ’ + Convert(varchar, @PageSize)
+ ’ * from products where productid not in (select top ’ + Convert(varchar, (@PageNumber - 1) * @PageSize) + ’ productid from products)’
exec sp_executesql @sql
go
--exec GetProductsByPage 1, 10
--exec GetProductsByPage 5, 10

2.使用临时表

if exists(select 1 from sys.objects where name = ’GetProductsByPage’ and type = ’P’)
drop proc GetProductsByPage
go
CREATE PROCEDURE GetProductsByPage
@PageNumber int,
@PageSize int
AS

-- 创建临时表

CREATE TABLE #TempProducts
(
ID int IDENTITY PRIMARY KEY,
ProductID int,
ProductName varchar(40) ,
SupplierID int,
CategoryID int,
QuantityPerUnit nvarchar(20),
UnitPrice money,
UnitsInStock smallint,
UnitsOnOrder smallint,
ReorderLevel smallint,
Discontinued bit
)

-- 填充临时表

INSERT INTO #TempProducts
(ProductID, ProductName, SupplierID, CategoryID, QuantityPerUnit, UnitPrice, UnitsInStock, UnitsOnOrder, ReorderLevel, Discontinued)
SELECT ProductID, ProductName, SupplierID, CategoryID, QuantityPerUnit, UnitPrice, UnitsInStock, UnitsOnOrder, ReorderLevel, Discontinued
FROM Products
DECLARE @FromID int
DECLARE @ToID int
SET @FromID = ((@PageNumber - 1) * @PageSize) + 1
SET @ToID = @PageNumber * @PageSize
SELECT ProductID, ProductName, SupplierID, CategoryID, QuantityPerUnit, UnitPrice, UnitsInStock, UnitsOnOrder, ReorderLevel, Discontinued
FROM #TempProducts
WHERE ID >= @FromID AND ID <= @ToID
go
--exec GetProductsByPage 1, 10
--exec GetProductsByPage 5, 10

3.使用表变量

为要分页的数据创建一个table变量,这个table变量里有一个作为主健的IDENTITY列.这样需要分页的每条记录在table变量里就和一个row index(通过IDENTITY列)关联起来了.一旦table变量产生,连接数据库表的SELECT语句就被执行,获取需要的记录.SET ROWCOUNT用来限制放到table变量里的记录的数量.
当SET ROWCOUNT的值指定为PageNumber * PageSize时,这个方法的效率取决于被请求的页数.对于比较前面的页来说– 比如开始几页的数据– 这种方法非常有效. 但是对接近尾部的页来说,这种方法的效率和默认分页时差不多

if exists(select 1 from sys.objects where name = ’GetProductsByPage’ and type = ’P’)
drop proc GetProductsByPage
go
CREATE PROCEDURE GetProductsByPage
@PageNumber int,
@PageSize int
AS
DECLARE @TempProducts TABLE
(
ID int IDENTITY,
productid int
)
DECLARE @maxRows int
SET @maxRows = @PageNumber * @PageSize

--在返回指定的行数之后停止处理查询

SET ROWCOUNT @maxRows
INSERT INTO @TempProducts (productid)
SELECT productid
FROM products
ORDER BY productid
SET ROWCOUNT @PageSize
SELECT p.*
FROM @TempProducts t INNER JOIN products p
ON t.productid = p.productid
WHERE ID > (@PageNumber - 1) * @PageSize
SET ROWCOUNT 0
GO
--exec GetProductsByPage 1, 10
--exec GetProductsByPage 5, 10

--4.使用row_number函数
--SQL Server 2005的新特性,它可以将记录根据一定的顺序排列,每条记录和一个等级相关这个等级可以用来作为每条记录的row index.

if exists(select 1 from sys.objects where name = ’GetProductsByPage’ and type = ’P’)
drop proc GetProductsByPage
go
CREATE PROCEDURE GetProductsByPage
@PageNumber int,
@PageSize int
AS
select ProductID, ProductName, SupplierID, CategoryID, QuantityPerUnit, UnitPrice, UnitsInStock, UnitsOnOrder, ReorderLevel, Discontinued
from
(select row_number() Over (order by productid) as row,ProductID, ProductName, SupplierID, CategoryID, QuantityPerUnit, UnitPrice, UnitsInStock, UnitsOnOrder, ReorderLevel, Discontinued
from products) as ProductsWithRowNumber
where row between (@PageNumber - 1) * @PageSize + 1 and @PageNumber * @PageSize
go
--exec GetProductsByPage 1, 10
--exec GetProductsByPage 5, 10view plaincopy to clipboardprint?
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="GridViewPaging.aspx.cs" Inherits="GridViewPaging" %>

Paging

|<
<<

>>
>|
转到第页

ReadOnly="True" SortExpression="ProductID" />

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 GridViewPaging : System.Web.UI.Page
{
//每页显示的最多记录的条数
private int pageSize = 10;
//当前页号
private int currentPageNumber;
//显示数据的总条数
private static int rowCount;
//总页数
private static int pageCount;
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
SqlConnection cn = new SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings["NorthwindConnectionString"].ConnectionString);
SqlCommand cmd = new SqlCommand("GetProductsCount", cn);
cmd.CommandType = CommandType.StoredProcedure;
cn.Open();
rowCount = (int)cmd.ExecuteScalar();
cn.Close();
pageCount = (rowCount - 1) / pageSize + 1;
currentPageNumber = 1;
ViewState["currentPageNumber"] = currentPageNumber;
lbtnPrevious.Enabled = false;
lbtnFirst.Enabled = false;
for (int i = 1; i <= pageCount; i++)
{
dropPage.Items.Add(new ListItem(i.ToString(), i.ToString()));
}
dropPage.SelectedValue = dropPage.Items.FindByValue(currentPageNumber.ToString()).Value;
SqlDataSource1.Select(DataSourceSelectArguments.Empty);
}
}
protected void SqlDataSource1_Selecting(object sender, SqlDataSourceSelectingEventArgs e)
{
SqlDataSource1.SelectParameters["PageNumber"].DefaultValue = currentPageNumber.ToString();
SqlDataSource1.SelectParameters["PageSize"].DefaultValue = pageSize.ToString();
}
protected void SqlDataSource1_Selected(object sender, SqlDataSourceStatusEventArgs e)
{
lblMessage.Text = "共找到" + rowCount + "条记录, 当前第" + currentPageNumber + "/" + pageCount + "页";
}
protected void lbtnPage_Command(object sender, CommandEventArgs e)
{
switch (e.CommandName)
{
case "First":
currentPageNumber = 1;
break;
case "Previous":
currentPageNumber = (int)ViewState["currentPageNumber"] - 1 > 1 ? (int)ViewState["currentPageNumber"] - 1 : 1;
break;
case "Next":
currentPageNumber = (int)ViewState["currentPageNumber"] + 1 < pageCount ? (int)ViewState["currentPageNumber"] + 1 : pageCount;
break;
case "Last":
currentPageNumber = pageCount;
break;
}
dropPage.SelectedValue = dropPage.Items.FindByValue(currentPageNumber.ToString()).Value;
ViewState["currentPageNumber"] = currentPageNumber;
SetButton(currentPageNumber);
SqlDataSource1.Select(DataSourceSelectArguments.Empty);
}
private void SetButton(int currentPageNumber)
{
lbtnFirst.Enabled = currentPageNumber != 1;
lbtnPrevious.Enabled = currentPageNumber != 1;
lbtnNext.Enabled = currentPageNumber != pageCount;
lbtnLast.Enabled = currentPageNumber != pageCount;
}
protected void dropPage_SelectedIndexChanged(object sender, EventArgs e)
{
currentPageNumber = int.Parse(dropPage.SelectedValue);
ViewState["currentPageNumber"] = currentPageNumber;
SetButton(currentPageNumber);
SqlDataSource1.Select(DataSourceSelectArguments.Empty);
}
}

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