MySQL Connector/Net Bulk Uploader not finding file on remote server - mysql

Question

I have pored through many pages trying to find an answer but have had no luck. I have a .NET page built in C# that has been working fine until a few days ago. Now it isn't working and I'm pulling my hair out to find out why.
The page has a file uploader that uploads a .csv file and saves it to a folder on the web server. Then it uses the MySQL Bulk Uploader to insert the records into the database on another server.
I have confirmed the file is uploading to the correct folder, but when MySQL tries to insert the records, it fails with the message "File 'E:\inetpub\wwwroot\training\data_uploads\filename.csv' not found (Errcode: 2 - No such file or directory)"
This page has worked for several years without any problem, but I updated some of the NuGet packages and removed some that were not being used, and now it's stopped working. What am I missing? Is there a package or a .dll I need to add back in? Unfortunately, I don't remember what I removed.
Here's the code I'm using:
protected void btnGo_Click(object sender, EventArgs e)
{
try
{
//if file is selected for upload
if (btnSelectFile.HasFile)
{
//upload data file to server
string path = string.Concat(Server.MapPath("~/data_uploads/" + btnSelectFile.FileName));
btnSelectFile.SaveAs(path);
string conString = ConfigurationManager.ConnectionStrings["nameOfConnectionString"].ConnectionString;
MySqlConnection conn = new MySqlConnection(conString);
conn.Open();
//get rid of old data
MySqlCommand truncateTerms = new MySqlCommand("TRUNCATE terms_temp;", conn);
truncateTerms.ExecuteNonQuery();
//create bulk uploader and set parameters
var bl = new MySqlBulkLoader(conn);
bl.TableName = "terms_temp";
bl.FieldTerminator = ",";
bl.FieldQuotationCharacter = '"';
bl.LineTerminator = "\r\n";
bl.FileName = path;
bl.NumberOfLinesToSkip = 2;
//insert data
var inserted = bl.Load(); //This is where it fails
conn.Close();
//do some other stuff
catch (Exception ex)
{
Label1.ForeColor = System.Drawing.Color.Red;
Label1.Text = ex.Message.ToString();
}
}

Answer 1

If you're bulk-loading a file that's stored on the web server, not the database server, you need to set MySqlBulkLoader.Local = true, to indicate that the file is local to the database client. Otherwise, the server will give an error that the file isn't found.
For security reasons you will also need to set AllowLoadLocalInfile=true in your connection string to enable this feature.