12、c#中事务及回滚

         public void UpdateContactTableByDataSet(DataSet ds, string strTblName)
         {
             try
             {
                 SqlDataAdapter myAdapter = new SqlDataAdapter();
                 SqlConnection conn = new SqlConnection("connection string");
                 SqlCommand myCommand = new SqlCommand("select * from strTblName", conn);
                 myAdapter.SelectCommand = myCommand;
                 SqlCommandBuilder myCommandBuilder = new SqlCommandBuilder(myAdapter);

                 conn.Open();
                 SqlTransaction myTrans = conn.BeginTransaction();
                 myCommand.Transaction = myTrans;

                 try
                 {
                     myAdapter.Update(ds, strTblName);
                     myTrans.Commit();
                 }
                 catch (Exception e)
                 {
                     try
                     {
                         myTrans.Rollback();//回滚并取消数据库的更新
                     }
                     catch (SqlException ex)
                     {
                         if (myTrans.Connection != null)
                         {
                             Console.WriteLine("回滚失败! 异常类型: " + ex.GetType());
                         }
                     }
                 }
                 finally
                 {
                     conn.Close();
                 }

             }
             catch (Exception ex)
             {
                 throw ex;
             }
         }

事务回滚主要用于提交失败。（lock）用于处理并发事件。