长时间连接后，MYSQL connector.net连接丢失

Question

I have mysql connection to remote server with connector.net 6.7.4

like this:

public MySqlConnection conn;
public MySqlCommand com;

public onStart()
{
   conn = new MySqlConnection("Server=xx.xx.xx.xx;Port=3306;Database=kbindb;Uid=collector; Pwd=xxx;");
   conn.Open();
   com = new MySqlCommand("SELECT * FROM blabla;", conn);
   timer.Interval=1000;
   timer.Enabled=True;

}   

public onTimerTick(bla bla)
{
    // timer.Enabled=False;
     MySqlDataReader dr = com.ExecuteReader();
     while(dr.Read()){
            //blabla
      }
     dr.Close();
     //timer.Enabled=True;
 }

Code is running succesfully but after 1-2 hours lock timer on this line : com.ExecuteReader(); It can not handling with try catch.

What can I do?

Answer 1

I wouldn't keep a connection to the database open any longer than you need it.. certainly not for hours. I assume you're getting a timeout of some sort.

Try creating the connection inside the tick event, get your data, and dispose of the connection. (The using statements in the following code will take care of disposing your resources.)

public onStart()
{
   timer.Interval = 1000;

   timer.Enabled = true;
}   

public onTimerTick(...)
{
    timer.Enabled = false;

    using (var conn = new MySqlConnection("Server=xx.xx.xx.xx;Port=3306;Database=kbindb;Uid=collector; Pwd=xxx;"))
    {
        conn.Open();
        using (var com = new MySqlCommand("SELECT * FROM blabla;", conn))
        {
            var reader = com.ExecuteReader();

            while (dr.Read())
            {
                //blabla
            }
        }
    }

    timer.Enabled = true;
}