Question

In my MySql i am having my data field as longblob i would like to get the content in that file so i have written my code as follows

This is what i am doing before inserting

  string filePath = Server.MapPath("AchTemplates/genACH.txt");
    string filename = Path.GetFileName(filePath);
    FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read);
    BinaryReader br = new BinaryReader(fs);
    Byte[] bytes = br.ReadBytes((Int32)fs.Length);
    br.Close();
    fs.Close();

    string strQuery = "insert into tblFiles(FName,FData) values (@_FName, @_FData)";
    MySqlCommand cmd = new MySqlCommand(strQuery);
    cmd.Parameters.Add("@_FName", MySqlDbType.VarChar).Value = filename;
    cmd.Parameters.Add("@_FData", MySqlDbType.LongBlob).Value = bytes;
    InsertUpdateData(cmd);

//Get Data

private void download(DataTable dt)
{
    Byte[] bytes = (Byte[])dt.Rows[0]["FData"];
    Response.Buffer = true;
    Response.Charset = "";
    Response.Cache.SetCacheability(HttpCacheability.NoCache);
    Response.ContentType = dt.Rows[0]["ContentType"].ToString();
    Response.AddHeader("content-disposition", "attachment;filename="
    + dt.Rows[0]["Name"].ToString());
    Response.BinaryWrite(bytes);
    Response.Flush();
    Response.End();
}

But i am getting the content as system.string[] why it is happening can any one tell

Answer 1

if dt.Rows[0]["FData"] is coming as a string (it is just plain text), use

byte[] bytes = Encoding.UTF8.GetBytes(dt.Rows[0]["FData"]);

If the data is not plain text and binary stored as string (and not base64 encoded), you are in trouble my friend.

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UPDATE

According to MySql documentation, it seems you should be using LONGBLOB and not LONGTEXT.