怎么样插入图片到数据库？

孟子的
http://dotnet.aspx.cc/ShowDetail.aspx?id=2A5DD7C6-A45A-48AB-A2E8-342A29F17506

插入图片到数据库的弊端是很多的，ASPX的空间不会比SQLserver的空间贵，而且一条记录一个图片，不知道别人如何实现的，我都是保存在目录中，除非我做的是C/S结构的，没有真正的服务器，只有数据库服务器的时候只能保存在数据库中！

%@ Page Language="c#" Debug="true" Trace="true"%>
<%@ Import Namespace="System.IO" %>
<%@ Import Namespace="System.Drawing" %>
<%@ Import Namespace="System.Drawing.Imaging" %>
<html>
<script runat =server>
      void UploadBtn_Click(Object sender, EventArgs e) {
         String filename;
         String filename1;
         String[] filename2;
         int q;
         filename=UploadFile.PostedFile.FileName ;
         filename2=filename.Split(new Char[] {'\\'});
         q=filename2.GetUpperBound(0);
         filename1=filename2[q];
         dis.Text="上传文件名："+filename1+"<br/>";
         UploadFile.PostedFile.SaveAs(Server.MapPath(filename1));
         ImageEditor.Visible = true;
         dis.Text+="文件大小："+UploadFile.PostedFile.ContentLength+"字节数";
         Image1.Src=filename1;
      }
      void UpdateBtn_Click(Object sender, EventArgs e) {
        String filename1;
   filename1=Image1.Src;
   System.Drawing.Image image = System.Drawing.Image.FromFile(Server.MapPath(filename1));
   System.Drawing.Image newimage = new Bitmap(image.Width, image.Height, PixelFormat.Format32bppRgb);
   Graphics g = Graphics.FromImage(newimage);
   g.DrawImage(image,0,0,image.Width,image.Height);
   Font f = new Font(FontType.SelectedItem.Text, Int32.Parse(FontSize.SelectedItem.Text));
   Brush b = new SolidBrush(Color.Red);
   g.DrawString(Caption.Text, f, b, 10, 140);
   g.Dispose();
   //System.Drawing.Image thumbImage = newimage.GetThumbnailImage(Convert.ToInt32(Width.Text),Convert.ToInt32(Height.Text),null,0);
   image.Dispose();
  // thumbImage.Save(Server.MapPath(filename1), ImageFormat.Jpeg);
   Image1.Src=filename1;
   Caption.Text="";
      }   </script>   <body>
   <asp:label id="dis" runat=server/>
     <form enctype="multipart/form-data" runat=server>          <h3>          Select File To Upload: <input id="UploadFile" type=file runat=server>          <asp:button Text="Upload Me!" OnClick="UploadBtn_Click" runat=server/>          <hr>

          <asp:panel id="ImageEditor" Visible=false runat=server>             <img ID="Image1" src="" runat="server"/>             <h3>
                Image Width: <asp:textbox id="Width" runat=server/>                 Image Height: <asp:textbox id="Height" runat=server/> <br/>                 Text Caption: <asp:textbox id="Caption" runat=server/>                 Caption Size: <asp:dropdownlist id="FontSize" runat=server>
                                         <asp:listitem>14</asp:listitem>
                                         <asp:listitem>18</asp:listitem>
                                         <asp:listitem>26</asp:listitem>
                                         <asp:listitem>36</asp:listitem>
                                         <asp:listitem>48</asp:listitem>
                                         <asp:listitem>62</asp:listitem>
                                      </asp:dropdownlist>
                 Caption Font: <asp:dropdownlist id="FontType" runat=server>
                                         <asp:listitem>黑体</asp:listitem>
                                         <asp:listitem>仿宋</asp:listitem>
                                         <asp:listitem>隶书</asp:listitem>
                                         <asp:listitem>楷书</asp:listitem>
                                         <asp:listitem>方正姚体</asp:listitem>
                                         <asp:listitem>华文彩云</asp:listitem>
                                      </asp:dropdownlist>

                 <asp:button Text="Update Image" OnClick="UpdateBtn_Click" runat=server/>             </h3>
          </asp:panel>      </form>   </body>
</html>

在ASP.NET中存取图片到数据库的示例
//开发环境：Window 2000、SQLServer2000、.Net Framework SDK正式版
     //开发语言：C#、ASP.Net
     //简介：数据库中图片存蓄及读取
         /*
     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，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：
     CREATE TABLE [dbo].[ImageStore] (
     [ImageID] [int] IDENTITY (1, 1) NOT NULL ,
     [ImageData] [image] NULL ,
     [ImageContentType] [varchar] (50) COLLATE Chinese_PRC_CI_AS NULL ,
     [ImageDescription] [varchar] (200) COLLATE Chinese_PRC_CI_AS NULL ,
     [ImageSize] [int] NULL
     ) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]
     */

     //UpLoadImage.aspx程序内容如下：     <%@ Page Inherits="UploadImage.UploadImage" SRC="UpLoadImage.cs" Language="C#"%>
     <HTML><title>上传图片</title>
     <BODY bgcolor="#FFFFFF">
     <FORM ENCTYPE="multipart/form-data" RUNAT="server" ID="Form1">
     <TABLE RUNAT="server" WIDTH="700" ALIGN="left" ID="Table1" cellpadding="0" cellspacing="0" border="0">
     <TR>
     <TD>上传图片(选择你要上传的图片)</TD>
     <TD>
     <INPUT TYPE="file" ID="UP_FILE" RUNAT="server" STYLE="Width:320" ACCEPT="text/*" NAME="UP_FILE">
     </TD>
     </TR>
     <TR>
     <TD>
     文件说明(添加上传图片说明，如：作者、出处)
     </TD>
     <TD>
     <asp:TextBox RUNAT="server" WIDTH="239" ID="txtDescription" MAINTAINSTATE="false" />
     </TD>
     </TR>
     <TR>
     <TD>
     <asp:Label RUNAT="server" ID="txtMessage" FORECOLOR="red" MAINTAINSTATE="false" />
     </TD>
     <TD>
     <asp:Button RUNAT="server" WIDTH="239" onCLICK="Button_Submit" TEXT="Upload Image" />
     </TD>
     </TR>
     </TABLE>
     </FORM>
     </BODY>
     </HTML>     //-------------------------------------------------------------------
     //UpLoadImage.cs程序内容如下：     using System;
     using System.Web;
     using System.IO;
     using System.Data;
     using System.Data.SqlClient;
     using System.Web.UI;
     using System.Web.UI.WebControls;
     using System.Web.UI.HtmlControls;
     namespace UploadImage
     {
     public class UploadImage : Page
    {
     protected HtmlInputFile UP_FILE; //HtmlControl、WebControls控件对象
     protected TextBox txtDescription;
     protected Label txtMessage;
     protected Int32 FileLength = 0; //记录文件长度变量

protected void Button_Submit(System.Object sender, System.EventArgs e)
{
     HttpPostedFile UpFile = UP_FILE.PostedFile; //HttpPostedFile对象，用于读取图象文件属性
     FileLength = UpFile.ContentLength; //记录文件长度
     try
    {
     if (FileLength == 0) { //文件长度为零时
     txtMessage.Text = "<b>请你选择你要上传的文件</b>";
     }
    else
    {
     Byte[] FileByteArray = new Byte[FileLength]; //图象文件临时储存Byte数组
     Stream StreamObject = UpFile.InputStream; //建立数据流对像
     //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
     StreamObject.Read(FileByteArray,0,FileLength);
     //建立SQL Server链接
     SqlConnection Con = new SqlConnection("Data Source=Localhost;Initial Catalog=testdb;User ID=sa;Pwd=;");
     String SqlCmd = "INSERT INTO ImageStore (ImageData, ImageContentType, ImageDescription, ImageSize) valueS (@Image, @ContentType, @ImageDescription, @ImageSize)";
     SqlCommand CmdObj = new SqlCommand(SqlCmd, Con);
     CmdObj.Parameters.Add("@Image",SqlDbType.Binary, FileLength).value = FileByteArray;
     CmdObj.Parameters.Add("@ContentType", SqlDbType.VarChar,50).value = UpFile.ContentType; //记录文件类型
     //把其它单表数据记录上传
     CmdObj.Parameters.Add("@ImageDescription", SqlDbType.VarChar,200).value = txtDescription.Text;
     //记录文件长度，读取时使用
     CmdObj.Parameters.Add("@ImageSize", SqlDbType.BigInt,8).value = UpFile.ContentLength;
     Con.Open();
     CmdObj.ExecuteNonQuery();
     Con.Close();
     txtMessage.Text = "<p><b>OK!你已经成功上传你的图片</b>";//提示上传成功
     }
     }
    catch (Exception ex)
    {
         txtMessage.Text = ex.Message.ToString();
     }
    }
    }
    }
     //----------------------------------------------------------------------
     //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:
     //ReadImage.aspx程序内容如下：     /-----------------------------------------------------------------------
     <%@ Page Inherits="ReadImage.MainDisplay" SRC="ReadImage.cs"%>
     //----------------------------------------------------------------------  //ReadImage.cs程序内容如下：
     using System;
     using System.Data;
     using System.Data.SqlClient;
     using System.Web.UI;
     using System.Web.UI.WebControls;
     using System.Web.UI.HtmlControls;
     namespace ReadImage {
     public class MainDisplay : System.Web.UI.Page {
     public void Page_Load(System.Object sender, System.EventArgs e) {

int ImgID = Convert.ToInt32(Request.QueryString["ImgID"]); //ImgID为图片ID      //建立数据库链接
     SqlConnection Con = new SqlConnection("Data Source=KING;Initial Catalog=testdb;User ID=sa;Pwd=;");
     String SqlCmd = "SELECT * FROM ImageStore WHERE ImageID = @ImageID";
     SqlCommand CmdObj = new SqlCommand(SqlCmd, Con);
     CmdObj.Parameters.Add("@ImageID", SqlDbType.Int).value = ImgID;
     Con.Open();
     SqlDataReader SqlReader = CmdObj.ExecuteReader();
     SqlReader.Read();
     Response.ContentType = (string)SqlReader["ImageContentType"];//设定输出文件类型
     //输出图象文件二进制数制
     Response.OutputStream.Write((byte[])SqlReader["ImageData"], 0, (int)SqlReader["ImageSize"]);
     Response.End();
     Con.Close();
     //很简单吧^_^
     }
     }
     }

    //--------------------------------------------------------------------
     //最后，我们当然要把它在Web页面显示出来啦
     //ShowImage.hml     <html>
     <body>
     这个是从数据库读取出来的图象：<img src="ReadImage.aspx?ImgID=1">
     <body>
     </html>

     //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

Dim FileByteArrayA() As Byte
Dim StreamObject As Stream
Dim splitStringA() As String  splitStringA = Request.Files("txfFile1").FileName.Split("\\")
                ReDim FileByteArrayA(Request.Files("txfFile1").ContentLength)
                StreamObject = Request.Files("txfFile1").InputStream
                StreamObject.Read(FileByteArrayA, 0, Request.Files("txfFile1").ContentLength)然后你想把splitStringA怎么样就怎么样了，update() set nn=splitStringA
不过上面用到了HTML中的一个控件的file field

O_DraftArchData data = new O_DraftArchData();DataRow dr = data.Tables[0].NewRow();
data.Tables[0].Rows.Add(dr);
if (txtFileContents.PostedFile != null)
{
mFilename=getRealFileName(txtFileContents.PostedFile.FileName);
if (mFilename!="")
{
intDocLen = txtFileContents.PostedFile.ContentLength;
byte[] Docbuffer = new byte[intDocLen];
objStream = txtFileContents.PostedFile.InputStream;
objStream.Read(Docbuffer ,0,intDocLen);
dr["MyImg"] = Docbuffer;//图像
dr["MyImgName"] = mFilename;//图像文件名
}
}
UpdateData(data) //更新数据库

Function SaveToDB(ByVal imgbin As Byte(), ByVal type As String) As Integer
        Dim connection As New SqlConnection(cn.ConnStr)
        Dim command = New SqlCommand("INSERT INTO zx0237(makformid,imgData,modDate,moduser) VALUES ( @img_name, @img_data,@type,@user)", connection)
        Dim param0 = New SqlParameter("@img_name", SqlDbType.VarChar, 50)
        param0.Value = Trim(theValue.Value)
        command.Parameters.Add(param0)        Dim param1 = New SqlParameter("@img_data", SqlDbType.Image)
        param1.Value = imgbin
        command.Parameters.Add(param1)        Dim param2 = New SqlParameter("@type", SqlDbType.VarChar)
        param2.Value = type
        command.Parameters.Add(param2)        Dim param3 = New SqlParameter("@user", SqlDbType.VarChar)
        param3.Value = Session("StuffID") & ""
        command.Parameters.Add(param3)
        connection.Open()
        Dim numRowsAffected As Integer = command.ExecuteNonQuery()
        connection.Close()
        SaveToDB = numRowsAffected
    End Function
    Private Sub Button1_ServerClick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.ServerClick
        Dim imgLen As Integer
        Dim Co As New ClassControlOpration()
        If Trim(theValue.Value) = "" Then
            Response.Write("<script>alert('请选择一张报价单号!');</script>")
            Exit Sub
        End If
        imgLen = File1.PostedFile.ContentLength
        Dim imgContentType As String = File1.PostedFile.FileName
        Dim imgName As String = imgContentType
        Dim imgBinaryData As Byte()
        ReDim imgBinaryData(imgLen)
        Dim n As Integer = File1.PostedFile.InputStream.Read(imgBinaryData, 0, imgLen)
        Try
            Dim RowsAffected As Integer = SaveToDB(imgBinaryData, DateTime.Now)
            If (RowsAffected > 0) Then
                DIV1.InnerText = "保存成功!"
            Else                Co.Alert(Page, "保存记录出错了" & Err.Description)
                Co = Nothing
            End If
            imgBinaryData = Nothing
        Catch
            If Err.Number = 5 Then
                DIV1.InnerText = "该单的图片已上传!"
            End If
        End Try    End Sub

litp(天道酬勤)

我按照你的方法去做了可是老是说这个错误是怎么回事呀？“
C:\Documents and Settings\Administrator\VSWebCache\XIA-09EA91A7C0D\UpLoadImage\UpLoadImage.aspx.cs(47): “System.Data.SqlClient.SqlParameter”并不包含对“value”的定义”

调试易

怎么样插入图片到数据库？

解决方案 »