如何将图片存储到数据库中
基本思路:用二进制流的形式打开图片，读取出二进制代码存入数据库即可。
FileStream Pic = new FileStream(sFileName, FileMode.Open);//sFileName是图片路径
byte[] PicByte = new byte[Pic.Length];
Pic.Read(PicByte, 0, PicByte.Length);
0.我的测试例子如下:
string strFileName = @"E:\Documents and Settings\jhtest\My Documents\My Pictures\2.jpg";
FileStream Pic = new FileStream(strFileName, FileMode.Open);//sFileName是图片路径
byte[] PicByte = new byte[Pic.Length];
Pic.Read(PicByte, 0, PicByte.Length);
SqlConnection con = new SqlConnection("Database=JDPlan;Server=jhtest2;uid=sa;Pwd=jhtest123;");
string cmdText = "insert into test(FileFormat,ImageFormat) values (@Image,@File)";
SqlCommand cmd = new SqlCommand(cmdText, con);
//二进制类型的值当然不能用字符串相加的形式传入,只能用添加参数的形式.
cmd.Parameters.Add("@Image", SqlDbType.Image,Convert.ToInt32(Pic.Length)).Value = PicByte;
cmd.Parameters.Add("@File", SqlDbType.Binary, Convert.ToInt32(Pic.Length)).Value = PicByte;
cmd.CommandType = CommandType.Text;
con.Open();
int returnValue = cmd.ExecuteNonQuery();
con.Close();
if (returnValue > 0)
{
Console.WriteLine("Insert Sucess!!!");
Console.ReadLine();
}
1.WinForm实例如下:
OpenFileDialog openFileDialog1 = new OpenFileDialog();
openFileDialog1.InitialDirectory = "c:\\";
openFileDialog1.Filter = "BMP 文件(*.bmp)|*.bmp|JPG 文件(*.jpg)|*.jpg|GIF 文件(*.gif)|*.gif|TIFF 文件(*.tiff)|*.tiff|WMF 文件(*.wmf)|*.wmf";
openFileDialog1.FilterIndex = 1;
openFileDialog1.Title = "打开图象文件";
openFileDialog1.RestoreDirectory = true;
if (openFileDialog1.ShowDialog( ) == DialogResult.OK)
{
string strFileName = openFileDialog1.FileName;
Bitmap m_bitmap = new Bitmap(strFileName);
this.pictureBox1.Image = m_bitmap;
}
}
//picturebox1图片保存到DataSet1
private void SavePicToDataSet(CurrencyManager thispic)
{
//if(this.pictureBox1.Image.!= null)
MemoryStream ms = new MemoryStream ();
this.pictureBox1.Image.Save (ms, System.Drawing.Imaging.ImageFormat.Bmp);
byte [] myData = new Byte [ms.Length ];
ms.Position = 0;
ms.Read (myData,0,Convert.ToInt32 (ms.Length ));
DataRow drv = ((DataRowView)thispic.Current).Row;
drv["pic"] = myData;
2.Asp.Net实例如下:
ASP。NET下如何上传图片到数据库，并且读出图片
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>