Update MS Access db in C# best way

Question

My update code:

 for (int i = this.MedaxilGridView1.CurrentCell.RowIndex; i < this.MedaxilGridView1.RowCount; i++)
 {
     // KartsifarishiGridView-dən id götürüb ona uyğun sorğumuzu yazırıq.
     sqlSorgu = "UPDATE customer set medaxil_status = '0' WHERE id = " + 
                 this.MedaxilGridView1.Rows[i].Cells["id"].Value;
     //Sorğunu icra edirk.
     Program.esas.sqlSorguCommand.CommandText = sqlSorgu;
     Program.esas.sqlSorguCommand.Connection = Program.esas.bazayaQosul;
     Program.esas.sqlSorguCommand.ExecuteNonQuery();
     MedaxilGridView1.Rows[i].DefaultCellStyle.BackColor = Color.Empty;

 }

Row count : 18286

This version takes 5 minutes

How do I make it faster?

Answer 1

You should think which query you use to extract the id's and use it directly into the update, so you call the database once:

"UPDATE customer set medaxil_status = '0' WHERE id in (select xxx xxx xxx)"

if you want to update all the rows , just remove the where clause and call the statement just once . If you have just an id list, maybe chunking the calls by using alwais the IN clause will reduce the number of queryes and hopefully the overall execution time.

Answer 2

You can use BeginExecuteNonQuery for that, that will save you the connection initiation overhead, by opening one connection, and batch executing all of your queries.

A full example from MSDN can be found here

Furthermore, I would advise you to start using SQL Parameters

Answer 3

Have you tried to enclose your loop in a Transaction ? This speeds up MS Access update operations.

Take a look on this sample here that shows how to use MS Access Transaction in C#