Question

I have a client application built in C# which sends an image along with an id to a webservice. The webservice then receives these information and inserts them in a MySQL database. But someone, the webmethod cannot recognize the Image and instead, it is just saving @icon in the database….can anyone tell me where I am making an error? Thanks in advance!

[WebMethod]
public string sendDataToMySql(string application_id, byte[] buffer)
{
    string MyConString = "SERVER=localhost;" +
           "DATABASE=test;" +
           "UID=root;" +
           "PASSWORD=password;";


    MySqlConnection connection = new MySqlConnection(MyConString);
    connection.Open();
    MySqlCommand command = new MySqlCommand("", connection);
    command.CommandText = "UPDATE application SET icon='@icon' WHERE application_id='" + application_id +"';";

    MySqlParameter oParam1 = command.Parameters.Add("@icon", MySqlDbType.Blob);
    oParam1.Value = buffer;

    command.ExecuteNonQuery();

    connection.Close();
    return "Data was inserted successfully!";
   }

Answer 1

If i had to guess anything, it’d be that SET icon='@icon' needs to be SET icon=@icon. The former only makes sense if you actually want to insert that string literal.

And the second thing I’d be wondering about is @icon vs. ?icon. I’m seeing asp.net code on stackoverflow referencing the question mark syntax and dev.mysql.com referencing the at symbol syntax.

I must confess which would be right for any existing drivers out there.