<转> 在ASP.NET中存取图片到数据库的示例
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//开发环境:Window 2000、SQLServer2000、.Net Framework SDK正式版 2
//开发语言:C#、ASP.Net 3
//简介:数据库中图片存蓄及读取 4

/**//* 5
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。 6
*/ 7

/**//* 8
首先在SQL Server中建立一个图片存储的数库表,ImageData Column为图象二进制数据储存字段,ImageContentType Column为图象文件类型记录字段,ImageDescription Column为储蓄图象文件说明字段,ImageSize Column为储存图象文件长度字段,结构如下: 9
CREATE TABLE [dbo].[ImageStore] ( 10
[ImageID] [int] IDENTITY (1, 1) NOT NULL , 11
[ImageData] [image] NULL , 12
[ImageContentType] [varchar] (50) COLLATE Chinese_PRC_CI_AS NULL , 13
[ImageDescription] [varchar] (200) COLLATE Chinese_PRC_CI_AS NULL , 14
[ImageSize] [int] NULL 15
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY] 16
*/ 17
18
//UpLoadImage.aspx程序内容如下: 19
<%@ Page Inherits="UploadImage.UploadImage" SRC="UpLoadImage.cs" Language="C#"%> 20
<HTML><title>上传图片</title> 21
<BODY bgcolor="#FFFFFF"> 22
<FORM ENCTYPE="multipart/form-data" RUNAT="server" ID="Form1"> 23
<TABLE RUNAT="server" WIDTH="700" ALIGN="left" ID="Table1" cellpadding="0" cellspacing="0" border="0"> 24
<TR> 25
<TD>上传图片(选择你要上传的图片)</TD> 26
<TD> 27
<INPUT TYPE="file" ID="UP_FILE" RUNAT="server" STYLE="Width:320" ACCEPT="text/*" NAME="UP_FILE"> 28
</TD> 29
</TR> 30
<TR> 31
<TD> 32
文件说明(添加上传图片说明,如:作者、出处) 33
</TD> 34
<TD> 35
<asp:TextBox RUNAT="server" WIDTH="239" ID="txtDescription" MAINTAINSTATE="false" /> 36
</TD> 37
</TR> 38
<TR> 39
<TD> 40
<asp:Label RUNAT="server" ID="txtMessage" FORECOLOR="red" MAINTAINSTATE="false" /> 41
</TD> 42
<TD> 43
<asp:Button RUNAT="server" WIDTH="239" ONCLICK="Button_Submit" TEXT="Upload Image" /> 44
</TD> 45
</TR> 46
</TABLE> 47
</FORM> 48
</BODY> 49
</HTML> 50
//------------------------------------------------------------------- 51
//UpLoadImage.cs程序内容如下: 52
using System; 53
using System.Web; 54
using System.IO; 55
using System.Data; 56
using System.Data.SqlClient; 57
using System.Web.UI; 58
using System.Web.UI.WebControls; 59
using System.Web.UI.HtmlControls; 60
namespace UploadImage 61

{ 62

public class UploadImage : Page
{ 63
protected HtmlInputFile UP_FILE; //HtmlControl、WebControls控件对象 64
protected TextBox txtDescription; 65
protected Label txtMessage; 66
protected Int32 FileLength = 0; //记录文件长度变量 67

protected void Button_Submit(System.Object sender, System.EventArgs e)
{ 68
HttpPostedFile UpFile = UP_FILE.PostedFile; //HttpPostedFile对象,用于读取图象文件属性 69
FileLength = UpFile.ContentLength; //记录文件长度 70

try
{ 71

if (FileLength == 0)
{ //文件长度为零时 72
txtMessage.Text = "<b>请你选择你要上传的文件</b>"; 73

} else
{ 74
Byte[] FileByteArray = new Byte[FileLength]; //图象文件临时储存Byte数组 75
Stream StreamObject = UpFile.InputStream; //建立数据流对像 76
//读取图象文件数据,FileByteArray为数据储存体,0为数据指针位置、FileLnegth为数据长度 77
StreamObject.Read(FileByteArray,0,FileLength); 78
//建立SQL Server链接 79
SqlConnection Con = new SqlConnection("Data Source=Localhost;Initial Catalog=testdb;User ID=sa;Pwd=;"); 80
String SqlCmd = "INSERT INTO ImageStore (ImageData, ImageContentType, ImageDescription, ImageSize) VALUES (@Image, @ContentType, @ImageDescription, @ImageSize)"; 81
SqlCommand CmdObj = new SqlCommand(SqlCmd, Con); 82
CmdObj.Parameters.Add("@Image",SqlDbType.Binary, FileLength).Value = FileByteArray; 83
CmdObj.Parameters.Add("@ContentType", SqlDbType.VarChar,50).Value = UpFile.ContentType; //记录文件类型 84
//把其它单表数据记录上传 85
CmdObj.Parameters.Add("@ImageDescription", SqlDbType.VarChar,200).Value = txtDescription.Text; 86
//记录文件长度,读取时使用 87
CmdObj.Parameters.Add("@ImageSize", SqlDbType.BigInt,8).Value = UpFile.ContentLength; 88
Con.Open(); 89
CmdObj.ExecuteNonQuery(); 90
Con.Close(); 91
txtMessage.Text = "<p><b>OK!你已经成功上传你的图片</b>";//提示上传成功 92
} 93

} catch (Exception ex)
{ 94
txtMessage.Text = ex.Message.ToString(); 95
}}}} 96
//---------------------------------------------------------------------- 97
//好了,图片已经上传到数据库,现在还要干什么呢?当然是在数据库中读取及显示在Web页中啦,请看以下程序: 98
//ReadImage.aspx程序内容如下: 99
/----------------------------------------------------------------------- 100
<%@ Page Inherits="ReadImage.MainDisplay" SRC="ReadImage.cs"%> 101
//---------------------------------------------------------------------- 102
//ReadImage.cs程序内容如下: 103
using System; 104
using System.Data; 105
using System.Data.SqlClient; 106
using System.Web.UI; 107
using System.Web.UI.WebControls; 108
using System.Web.UI.HtmlControls; 109

namespace ReadImage
{ 110

public class MainDisplay : System.Web.UI.Page
{ 111

public void Page_Load(System.Object sender, System.EventArgs e)
{ 112
int ImgID = Convert.ToInt32(Request.QueryString["ImgID"]); //ImgID为图片ID 113
//建立数据库链接 114
SqlConnection Con = new SqlConnection("Data Source=KING;Initial Catalog=testdb;User ID=sa;Pwd=;"); 115
String SqlCmd = "SELECT * FROM ImageStore WHERE ImageID = @ImageID"; 116
SqlCommand CmdObj = new SqlCommand(SqlCmd, Con); 117
CmdObj.Parameters.Add("@ImageID", SqlDbType.Int).Value = ImgID; 118
Con.Open(); 119
SqlDataReader SqlReader = CmdObj.ExecuteReader(); 120
SqlReader.Read(); 121
Response.ContentType = (string)SqlReader["ImageContentType"];//设定输出文件类型 122
//输出图象文件二进制数制 123
Response.OutputStream.Write((byte[])SqlReader["ImageData"], 0, (int)SqlReader["ImageSize"]); 124
Response.End(); 125
Con.Close(); 126
//很简单吧^_^ 127
} 128
} 129
} 130
//-------------------------------------------------------------------- 131
//最后,我们当然要把它在Web页面显示出来啦 132
//ShowImage.hml 133
<html> 134
<body> 135
这个是从数据库读取出来的图象:<img src="ReadImage.aspx?ImgID=1"> 136
<body> 137
</html> 138
//------------------------------------------------------------------ 139
//最后,这程序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 140
//Good Luck,engine 141
-------------------------------------------------------------------- 142
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