Home > .NET Development > Storing files to mssql database and downloading using Asp.NET

Storing files to mssql database and downloading using Asp.NET


1) First create a new column and set it as varbinary(MAX) for the datatype.

2) Use this code to store the file to database:

            //Read File to Bytes
                    FileStream st = new FileStream(<Location of the file>, FileMode.Open);
                    byte[] fileData= new byte[st.Length];
                    st.Read(fileData, 0, (int)st.Length);
                    st.Close();

                    SqlParameter[] param = new SqlParameter[] { new SqlParameter(“@ID”,<Reference ID>),
                                                    new SqlParameter(“@Data”,fileData)  };

            int i = SqlAccessor.ExecuteNonQuery(<ConnectionString>, SqlAccessor.SqlCommandBuilder(new SqlCommand (<Stored Procedure Name>), param), CommandType.StoredProcedure, out retVal);

 I’ve used Application Blocks to simplify data operation.

To Retrieve the data and to be downloaded from an ASP.NET Page:

3)  I created a function that returns a byte array with ID as parameter

 public static byte[] GetFileFromDB(string id)
    {
        object[] retVal = null;
        byte[] file = null;
        SqlParameter[] param = new SqlParameter[]
        {
            new SqlParameter (“@id”, id)
        };
        string _connString = ConfigurationManager.ConnectionStrings[<ConnectionStringName>].ConnectionString.ToString();
        SqlDataReader reader = SqlAccessor.ExecuteReader(_connString, SqlAccessor.SqlCommandBuilder(new SqlCommand(“SourceFileLogSelFileDataProc”), param), CommandType.StoredProcedure, out retVal);

        if (reader.Read())
        {
            file = (byte[])reader[“<varbinary column that we define in Step 1>“];
        }

        return file;
    }

4) And on the ASP.NET Page itself, on the Page_Load event:

           byte[] fileData = Utils.GetFileFromDB(<ID>);
            Response.ClearContent();
            Response.AddHeader(“Content-Disposition”, “attachment; filename=” + <filename>);
            BinaryWriter bw = new BinaryWriter(Response.OutputStream);
            bw.Write(fileData);
            bw.Close();
            Response.ContentType = ReturnExtension(<file extension>);
            Response.End();

 5) I have another method to determine the ContentType:

  private string ReturnExtension(string fileExtension)
    {
        switch (fileExtension)
        {
            case “.htm”:
            case “.html”:
            case “.log”:
                return “text/HTML”;
            case “.txt”:
                return “text/plain”;
            case “.doc”:
                return “application/ms-word”;
            case “.tiff”:
            case “.tif”:
                return “image/tiff”;
            case “.asf”:
                return “video/x-ms-asf”;
            case “.avi”:
                return “video/avi”;
            case “.zip”:
                return “application/zip”;
            case “.xls”:
            case “.csv”:
                return “application/vnd.ms-excel”;
            case “.gif”:
                return “image/gif”;
            case “.jpg”:
            case “jpeg”:
                return “image/jpeg”;
            case “.bmp”:
                return “image/bmp”;
            case “.wav”:
                return “audio/wav”;
            case “.mp3”:
                return “audio/mpeg3”;
            case “.mpg”:
            case “mpeg”:
                return “video/mpeg”;
            case “.rtf”:
                return “application/rtf”;
            case “.asp”:
                return “text/asp”;
            case “.pdf”:
                return “application/pdf”;
            case “.fdf”:
                return “application/vnd.fdf”;
            case “.ppt”:
                return “application/mspowerpoint”;
            case “.dwg”:
                return “image/vnd.dwg”;
            case “.msg”:
                return “application/msoutlook”;
            case “.xml”:
            case “.sdxl”:
                return “application/xml”;
            case “.xdp”:
                return “application/vnd.adobe.xdp+xml”;
            default:
                return “application/octet-stream”;
        }
    }

Hope this helps.

Advertisements
Categories: .NET Development Tags: ,
  1. Justin
    August 2, 2017 at 12:23 pm

    We are using BT 2013 and what we are trying to do is store the Interchange COntrol number in a SQL DB that ties with Invoice number and Delivery number based on EDI doc. The out of box DBs in the DTAdb stores the Interchange Control number but does not tie it back to the Invoice or delivery number. We are trying to add that. Do you have any suggestion?

  1. February 13, 2012 at 6:24 pm

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

%d bloggers like this: