數據庫超時問題的徹底解決

 最近被一個數據庫超時問題，弄的很崩潰。花了很多時間，終於解決了。下面加色和加粗的地方重點看看。

  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();//不用了，要關閉數據庫釋放資源，否則會引起超時問題

 

 //建立一個用來離線查詢並存儲的dataset

                SqlConnection sqlcon = new SqlConnection(conn);

                sqlcon.Open();

                SqlCommand sqlcmd = new SqlCommand();

                sqlcmd.Connection = sqlcon;

                sqlcmd.CommandTimeout = 1800;//30分鍾

                sqlcmd.CommandText = "select * from xgk_xscj";

                SqlDataAdapter sda_gx_xscj = new SqlDataAdapter(sqlcmd);//面向全國的用戶，還要設置where條件獲取指定的學校的指定年級和年度的數據，盡量少。

                SqlCommandBuilder scb = new SqlCommandBuilder(sda_gx_xscj);//這個非常重要，否則可能保存失敗

                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");//放到最后執行

                     ds_xscj_pm.Dispose();

                     ds_xscj_tj.Dispose();

                     sda_gx_xscj.Dispose();

                     sqlcon.Close();