如何在SQLServer中保存和输出图片
[作者]:菩提树下的杨过 [来源]:互联网 [收录时间]:2007-12-7 20:09:32
建表   

  为了试验这个例子你需要一个含有数据的table(你可以在现在的库中创建它,也可以创建一个新的数据库),下面是它的结构:  

   Column Name
   Datatype
   Purpose
   ID
   Integer
   identity column Primary key
   IMGTITLE
   Varchar(50)
   Stores some user friendly title to identity the image
   IMGTYPE
   Varchar(50)
   Stores image content type. This will be same as recognized content types of ASP.NET
   IMGDATA
   Image
   Stores actual image or binary data.

  保存images进SQL Server数据库  

  为了保存图片到table你首先得从客户端上传它们到你的web服务器。你可以创建一个web form,用TextBox得到图片的标题,用HTML File Server Control得到图片文件。确信你设定了Form的encType属性为multipart/form-data。  

   Stream imgdatastream = File1.PostedFile.InputStream;
   int imgdatalen = File1.PostedFile.ContentLength;
   string imgtype = File1.PostedFile.ContentType;
   string imgtitle = TextBox1.Text;
   byte[] imgdata = new byte[imgdatalen];
   int n = imgdatastream.Read(imgdata,0,imgdatalen);
   string connstr=
   ((NameValueCollection)Context.GetConfig
   ("appSettings"))["connstr"];
   SqlConnection connection = new SqlConnection(connstr);
   SqlCommand command = new SqlCommand
   ("INSERT INTO ImageStore(imgtitle,imgtype,imgdata)
   VALUES ( @imgtitle, @imgtype,@imgdata )", connection );
   SqlParameter paramTitle = new SqlParameter
   ("@imgtitle", SqlDbType.VarChar,50 );
   paramTitle.Value = imgtitle;
   command.Parameters.Add( paramTitle);
   SqlParameter paramData = new SqlParameter
   ( "@imgdata", SqlDbType.Image );
   paramData.Value = imgdata;
   command.Parameters.Add( paramData );
   SqlParameter paramType = new SqlParameter
   ( "@imgtype", SqlDbType.VarChar,50 );
   paramType.Value = imgtype;
   command.Parameters.Add( paramType );
   connection.Open();
   int numRowsAffected = command.ExecuteNonQuery();
   connection.Close();  

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