ASP.NET中存取图片到数据库的示例(C#)
//开发环境：Window 2003、SQLServer2000、.Net 2.0
//开发语言：C#、ASP.Net
//简介：图片预览，数据库中图片存储及读取
//作者：wayne-ivan
//Email:wayne-ivan@163.com
/*
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]
*/
//PreviewAndSave.aspx 页面如下
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="PreviewAndSave.aspx.cs" Inherits="_PreviewAndSave" %>
<!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>
<script language="javascript" type="text/javascript">
function preview()
{
var x = document.getElementById("file4");
//var y = document.getElementById("Image1");
var z = document.getElementById("Image2");
if(!x || !x.value || !z)
return;
var patn = /\.jpg$|\.jpeg$|\.gif$/i;
if(patn.test(x.value))
{
//y.src = "file://localhost/" + x.value;
z.src = "file://localhost/" + x.value;
}
else
{
alert("您选择的似乎不是图像文件。");
}
}
</script>
</head>
<body id="UP_FILEa">
<form id="form1" runat="server">
<div>
<asp:Image ID="Image1" runat="server" Height="174px" Width="159px" />
<input id="UP_FILE" runat="server" type="file" onpropertychange="document.all.Image1.src='file:///'+this.value"/>
<br />
<asp:Image ID="Image2" runat="server" Height="174px" Width="159px" />
<input type="file" name="file4" id="file4" onchange="preview()" /> <br />
<asp:TextBox ID="txtDescription" runat="server" Visible="False"></asp:TextBox>
<asp:Label ID="txtMessage" runat="server" Text="Label" Visible="False"></asp:Label>
<asp:Button ID="BtnSave" runat="server" OnClick="Button1_Click" Text="上传" />
<asp:Button ID="BtnRead" runat="server" OnClick="Button3_Click" Text="读取" />
<asp:Button ID="Button2" runat="server" OnClick="Button2_Click" Text="读取到另一个页面" Visible="False" /> <br/>
<asp:RadioButtonList ID="RadioButtonList1" runat="server" AutoPostBack="True" OnSelectedIndexChanged="RadioButtonList1_SelectedIndexChanged">
</asp:RadioButtonList></div>
</form>
</body>
</html>
//PreviewAndSave.aspx.cs 如下
using System;
using System.Data;
using System.Configuration;
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;
using System.IO;
public partial class _PreviewAndSave : System.Web.UI.Page
{
protected Int32 FileLength = 0;
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
bindRadioList();
}
}
private void bindRadioList()
{
DataTable dt = new DataTable();
string strCon = System.Configuration.ConfigurationSettings.AppSettings["DSN"];
SqlConnection Con = new SqlConnection(strCon);
Con.Open();
SqlDataAdapter da = new SqlDataAdapter("select ImageID from ImageStore", Con);
da.Fill(dt);
RadioButtonList1.DataTextField = "ImageID";
RadioButtonList1.DataValueField = "ImageID";
RadioButtonList1.DataSource = dt;
RadioButtonList1.DataBind();
if (dt.Rows.Count > 0)
RadioButtonList1.SelectedIndex = 0;
}
//保存图片到数据库
protected void Button1_Click(object sender, 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=ghrmsdb;User ID=sa;Pwd=sa;");
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();
}
//Response.Redirect("ReadImage.aspx?id=1");
bindRadioList();
}
protected void Button3_Click(object sender, EventArgs e)
{
//int ImgID = Convert.ToInt32(Request.QueryString["ID"]); //ID为图片ID
int ImgID = Convert.ToInt32(RadioButtonList1.SelectedValue);
//建立数据库链接
string strCon = System.Configuration.ConfigurationSettings.AppSettings["DSN"];
SqlConnection Con = new SqlConnection(strCon);
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
string fileName = Server.MapPath(this.Request.ApplicationPath) + "\\" + ImgID + ".jpg";// + "\\1.jpg";
System.IO.File.WriteAllBytes(fileName, (byte[])SqlReader["ImageData"]);
this.Image1.ImageUrl = this.Request.ApplicationPath + "/" + ImgID + ".jpg";
//输出图象文件二进制数制
//Response.OutputStream.Write((byte[])SqlReader["ImageData"], 0, (int)SqlReader["ImageSize"]);
//Response.End();
//也可以保存为图像
// FileStream fs = new FileStream(@"C:\aa.BMP", FileMode.OpenOrCreate, FileAccess.Write);
// fs.Write((byte[])SqlReader["ImageData"], 0,(int)SqlReader["ImageSize"]);
// fs.Close();
Con.Close();
}
protected void RadioButtonList1_SelectedIndexChanged(object sender, EventArgs e)
{
ReadPicutre();
}
//从数据库中读取文件显示出来
private void ReadPicutre()
{
int ImgID = Convert.ToInt32(RadioButtonList1.SelectedValue);
//建立数据库链接
string strCon = System.Configuration.ConfigurationSettings.AppSettings["DSN"];
SqlConnection Con = new SqlConnection(strCon);
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
//将文件保存到文件夹，然后在读取
string fileName = Server.MapPath(this.Request.ApplicationPath) + "\\" + ImgID + ".jpg";// + "\\1.jpg";
System.IO.File.WriteAllBytes(fileName, (byte[])SqlReader["ImageData"]);
this.Image1.ImageUrl = this.Request.ApplicationPath + "/" + ImgID + ".jpg";
//输出图象文件二进制数制
//Response.OutputStream.Write((byte[])SqlReader["ImageData"], 0, (int)SqlReader["ImageSize"]);
//Response.End();
//也可以保存为图像
// FileStream fs = new FileStream(@"C:\aa.BMP", FileMode.OpenOrCreate, FileAccess.Write);
// fs.Write((byte[])SqlReader["ImageData"], 0,(int)SqlReader["ImageSize"]);
// fs.Close();
Con.Close();
}
//在新打开的页面显示图片
protected void Button2_Click(object sender, EventArgs e)
{
//得到用户要上传的文件名
string strFilePathName = UP_FILE.PostedFile.FileName;
string strFileName = Path.GetFileName(strFilePathName);
int FileLength = UP_FILE.PostedFile.ContentLength;
if (FileLength <= 0)
return;
try
{//上传文件
Byte[] FileByteArray = new Byte[FileLength]; //图象文件临时储存Byte数组
Stream StreamObject = UP_FILE.PostedFile.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
string strCon = System.Configuration.ConfigurationSettings.AppSettings["DSN"];
SqlConnection Con = new SqlConnection(strCon);
// String SqlCmd = "Insert INTO ImageStore (ImageData, ImageContentType, ImageDescription, ImageSize) VALUES (@Image, @ContentType, @ImageDescription, @ImageSize)";
String SqlCmd = "Insert INTO ImageStore (ImageData) VALUES (@Image)";
SqlCommand CmdObj = new SqlCommand(SqlCmd, Con);
CmdObj.Parameters.Add("@Image", SqlDbType.Binary, FileLength).Value = FileByteArray;
CmdObj.Parameters.Add("@ContentType", SqlDbType.VarChar, 50).Value = UP_FILE.PostedFile.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 = FileLength;
Con.Open();
CmdObj.ExecuteNonQuery();
Con.Close();
//跳转页面
Response.Redirect("ReadImage.aspx?id=1");
}
catch
{
}
}
}