Complete solution to the problem of database timeout

 I was recently crashed by a database timeout issue. It took a lot of time and finally solved it. Let's take a look at the highlights and highlights below.

  var cx_xscj = from aa in sjklj.xgk_xscj

                          select aa;

            foreach (var kk in cx_xscj)

            {

                sjklj.xgk_xscj.DeleteObject(kk);

            }

            sjklj.SaveChanges();

 sjklj.Connection.Close (); // No need to close the database to release resources, otherwise it will cause timeout problems

 

 // Create a dataset for offline query and storage

                SqlConnection sqlcon = new SqlConnection(conn);

                sqlcon.Open();

                SqlCommand sqlcmd = new SqlCommand();

                sqlcmd.Connection = sqlcon;

                sqlcmd.CommandTimeout = 1800; // 30 minutes

                sqlcmd.CommandText = "select * from xgk_xscj";

                SqlDataAdapter sda_gx_xscj = new SqlDataAdapter (sqlcmd); // For users across the country, also set the where condition to obtain the specified grade and annual data of the specified school, as little as possible.

                SqlCommandBuilder scb = new SqlCommandBuilder (sda_gx_xscj); // This is very important, otherwise it may fail to save

                DataSet ds_xscj_pm = new DataSet();

                sda_gx_xscj.Fill(ds_xscj_pm, "xscj");

 

 sda_gx_xscj.Update (ds_xscj_pm, "xscj"); //.Update(ds, "xscj"); // Last execution

                     ds_xscj_pm.Dispose();

                     ds_xscj_tj.Dispose();

                     sda_gx_xscj.Dispose ();

                     sqlcon.Close();