如何将数据库二进制图片保存到硬盘上
1.建立一个aspx页面，copy html代码
<!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>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:FileUpload ID="FileUpload1" runat="server" /> <asp:TextBox ID="txtUserName"
runat="server"></asp:TextBox>
<asp:Button ID="Button2" runat="server" OnClick="Button2_Click" Text="保存" />
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="将数据库二进制图片存到磁盘" Width="207px" /></div>
</form>
</body>
</html>
2.cs代码
using System;
using System.Data;
using System.Configuration;
using System.Collections;
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 Default3 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button2_Click(object sender, EventArgs e)
{
//把图片保存成数据库二进制形式
Stream ImageStream;
string Path = FileUpload1.PostedFile.FileName;// 文件名称
int Size = FileUpload1.PostedFile.ContentLength; // 文件大小
string Type = FileUpload1.PostedFile.ContentType; // 文件类型
ImageStream = FileUpload1.PostedFile.InputStream;
byte[] Content = new byte[Size];
int Status = ImageStream.Read(Content, 0, Size);
SqlConnection conn = new SqlConnection(ConfigurationSettings.AppSettings["ConnectionString"]);
SqlCommand comm = new SqlCommand("insert into testimage (UserName,Image,Path,Type) values(@UserName,@Image,@Path,@Type)", conn);
comm.CommandType = CommandType.Text;
comm.Parameters.Add("@UserName", SqlDbType.VarChar, 255).Value = txtUserName.Text;
comm.Parameters.Add("@Image", SqlDbType.Image).Value = Content;
comm.Parameters.Add("@Path", SqlDbType.VarChar, 255).Value = Path;
comm.Parameters.Add("@Type", SqlDbType.VarChar, 255).Value = Type;
conn.Open();
comm.ExecuteNonQuery();
conn.Close();
}
protected void Button1_Click(object sender, EventArgs e)
{
//把数据库二进制图片转存到硬盘中
string connStr = ConfigurationSettings.AppSettings["ConnectionString"];
SqlConnection conn = new SqlConnection(connStr);
string sql = "select * from testimage";
SqlCommand cmd = new SqlCommand(sql, conn);
conn.Open();
SqlDataReader dr = cmd.ExecuteReader();
while (dr.Read())
{
byte[] bytes = (byte[])dr["Image"];
FileStream fs = new FileStream(@"c:\" + dr["UserID"] + ".jpg", FileMode.Create, FileAccess.Write);
fs.Write(bytes, 0, bytes.Length);
fs.Flush();
fs.Close();
}
dr.Close();
conn.Close();
}
}
3.数据库脚本
if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[TestImage]') and OBJECTPROPERTY(id, N'IsUserTable') = 1)
drop table [dbo].[TestImage]
GO
CREATE TABLE [dbo].[TestImage] (
[UserID] [int] IDENTITY (1, 1) NOT NULL ,
[UserName] [nvarchar] (500) COLLATE Chinese_PRC_CI_AS NULL ,
[Image] [image] NULL ,
[Path] [nvarchar] (500) COLLATE Chinese_PRC_CI_AS NULL ,
[Type] [nvarchar] (20) COLLATE SQL_Latin1_General_CP1_CI_AS NULL
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]
GO
