数据|数据库开发环境：Window 2000、SQLServer2000、.Net Framework SDK正式版
开发语言：C#、ASP.Net
简介：数据库中图片存储及读取
说明：在ASP中，我们用Request.TotalBytes、Request.BinaryRead()来上传图片，这个可恶的BinaryRead()方法非常笨，单个文件上传倒没什么大事，单如果多个图片上专可就花大气力了…！而现在ASP.Net中将会把解决以前ASP中文件上传的种种问题，使你在ASP.Net中轻轻松松开发出功能强大的上传程序，下面大家看看例子啦。
首先在SQL Server中建立一个图片存储的数库表，SqlScript如下:
if exists (select * from dbo.sysobjects where id = object_id(N"[dbo].[image]") and OBJECTPROPERTY(id, N"IsUserTable") = 1)
drop table [dbo].[image]
GO
CREATE TABLE [dbo].[image] (
[img_pk] [int] IDENTITY (1, 1) NOT NULL ,
[img_name] [varchar] (50) NULL ,
[img_data] [image] NULL ,
[img_contenttype] [varchar] (50) NULL
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]
GO
ALTER TABLE [dbo].[image] WITH NOCHECK ADD
CONSTRAINT [PK_image] PRIMARY KEY NONCLUSTERED
(
[img_pk]
) ON [PRIMARY]
GO
------------------------------------------------------------
一、上传图片:
imgupload.aspx文件:
<% Page language="c#" Codebehind="imgupload.aspx.cs" AutoEventWireup="false" Inherits="study.uploadimage.imgupload" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
<title>imgupload</title>
<meta name="GENERATOR" Content="Microsoft Visual Studio 7.0">
<meta name="CODE_LANGUAGE" Content="C#">
<meta name="vs_defaultClientScript" content="JavaScript">
<meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
</HEAD>
<body>
<form enctype="multipart/form-data" runat="server" id="form1" name="form1">
文件名 <input type="text" id="imgName" runat="server" NAME="imgName">
选择文件 <input id="UploadFile" type="file" runat="server" NAME="UploadFile">
<asp:button Text="上传" runat="server" ID="Button1" />
</form>
<a content="JavaScript">
<meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
</HEAD>
<body MS_POSITIONING="GridLayout">
</body>
</HTML>
codebehind文件：
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 study.uploadimage
{
/// <summary>
/// imgview 的摘要说明。
/// </summary>
public class imgview : System.Web.UI.Page
{
private void Page_Load(object sender, System.EventArgs e)
{
SqlConnection myDSN = new SqlConnection(Application["Test_Conn"].ToString());
myDSN.Open();
int imgid = int.Parse(Request.QueryString["id"]);
string sqlText = "SELECT img_name, img_data, img_contenttype FROM image where img_pk=" + imgid;
Trace.Write(sqlText);
SqlCommand MyCommand = new SqlCommand (sqlText, myDSN);
SqlDataReader dr =MyCommand.ExecuteReader();
if(dr.Read())
{
Response.ContentType = (dr["img_contenttype"].ToString());
Response.BinaryWrite((byte[])dr["img_data"]);
}
myDSN.Close();
}
#region Web Form Designer generated code
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.Load += new System.EventHandler(this.Page_Load);
}
#endregion
}
}
这样这个程序就完成了，简单吧。当然还很多改进之处，希望大家多想想多编编一定可以写出更多的图象上传程序。
数据库中图片存储及读取
80酷酷网 80kuku.com
