Question

我有一个运行数据库查询的webapp，希望它在表发生变化时进行更新。我以前曾经做过，但现在可以用，但是由于某种原因现在还不能用。

SQL Server已启用代理，而我正在使用SignalR。我已经关注了许多帮助页面/教程，但无法使它正常工作！

StatRepo.cs

public class StatRepo
    {

        readonly string _connstring = ConfigurationManager.ConnectionStrings["DefaultConnection"].ConnectionString;

        public IEnumerable<Telephony>GetAllQueues()
        {
            var realtime = new List<Telephony>();

            using (var connection = new SqlConnection(_connstring))
            {
                connection.Open();
                using (var command = new SqlCommand(@"SELECT [QueueName], [StatDateTime], [ServiceLevel60], [ServiceLevel60_RAG], [CallsWaiting], [CallsWaiting_RAG], [MaxWaitTime], [MaxWaitTime_RAG], [AvgSpeedAnswer], [AvgSpeedAnswer_RAG], [AgentsLoggedIn], [AgentsLoggedIn_RAG], [AgentsInTalkCalc], [AgentsReady], [AgentsReady_RAG], [CallsOffered], [CallsAnswered] FROM [dbo].[statserver_telephony_LIVE] WHERE [QueueName] = 'Enhance'", connection))
                {
                    command.Notification = null;
                    var dependency = new SqlDependency(command);
                    dependency.OnChange += new OnChangeEventHandler(Dependency_OnChange);
                    if (connection.State == System.Data.ConnectionState.Closed)
                    {
                        connection.Open();
                    }
                    var reader = command.ExecuteReader();
                    while (reader.Read())
                    {
                        realtime.Add(item: new Telephony
                        {
                            QueueName = (string)reader["QueueName"],
                            StatDateTime = (DateTime)reader["StatDateTime"],
                            ServiceLevel60 = (decimal)reader["ServiceLevel60"],
                            ServiceLevel60_RAG = (string)reader["ServiceLevel60_RAG"],
                            CallsWaiting = (int)reader["CallsWaiting"],
                            CallsWaiting_RAG = (string)reader["CallsWaiting_RAG"],
                            MaxWaitTime = (int)reader["MaxWaitTime"],
                            MaxWaitTime_RAG = (string)reader["MaxWaitTime_RAG"],
                            AvgSpeedAnswer = (int)reader["AvgSpeedAnswer"],
                            AvgSpeedAnswer_RAG = (string)reader["AvgSpeedAnswer_RAG"],
                            AgentsLoggedIn = (int)reader["AgentsLoggedIn"],
                            AgentsLoggedIn_RAG = (string)reader["AgentsLoggedIn_RAG"],
                            AgentsReady = (int)reader["AgentsReady"],
                            AgentsReady_RAG = (string)reader["AgentsReady_RAG"],
                            AgentsInTalk = (decimal)reader["AgentsInTalkCalc"],
                            //AgentsInTalk_RAG = (string)reader["AgentsInTalk_RAG"],
                            CallsOffered = (int)reader["CallsOffered"],
                            CallsAnswered = (int)reader["CallsAnswered"],
                        });
                    }


                }
            }
            return realtime;
        }

        private void Dependency_OnChange(object sender, SqlNotificationEventArgs e)
        {
            var dependency = (SqlDependency)sender;
            dependency.OnChange -= Dependency_OnChange;

            System.Diagnostics.Debug.WriteLine(DateTime.Now + " Type: " + e.Type);
            System.Diagnostics.Debug.WriteLine(DateTime.Now + " Info: " + e.Info);
            //System.Diagnostics.Debug.WriteLine(DateTime.Now + " Source: " + e.Source);

            if (e.Type == SqlNotificationType.Change)
            {
                System.Diagnostics.Debug.WriteLine("This got hit");
                RealTimeHub.SendMessages();
                GetAllQueues();
            }
            else
            {
                //Do somthing here
                //Console.WriteLine(e.Type);
            }
        }
    }

SqlNotificationType始终为“订阅”，它永远不会以“更改”的形式出现，因此它永远不会被点击，因此不会更新前端。

我非常确定SQL查询符合正常工作所需的条件

编辑：这显然是SQL Server问题，因为我尝试了使用不同服务器的项目的早期版本，并且此代码运行良好。我将其修改为指向新服务器，然后再次中断。我需要检查/更改的服务器上的代理内是否有东西？

SQLDependency中没有“更改”事件

0 个答案: