1

我有控制台应用程序,我在其中执行 sqldependency。我的问题是当我将 commandType 设置为 Text 时,它工作正常。但是如果我使用 commandType 作为 StoredProcedure,onchange 方法会无限调用。

请看下面的代码:



        static DataSet myDataSet;
        static SqlConnection connection;
        static SqlCommand command;

        static void Main(string[] args)
        {

            // Remove any existing dependency connection, then create a new one.
            string connstr = "Data Source=XYZ;Initial Catalog=Dev;Integrated Security=True";
            string ssql = @"[dbo].[SchedulerPendingControlRequestIDFetch]";

            CanRequestNotifications();


            SqlDependency.Stop(connstr);
            SqlDependency.Start(connstr);


            if (connection == null)
                connection = new SqlConnection(connstr);
            if (command == null)
                command = new SqlCommand(ssql, connection);
            command.CommandType = CommandType.StoredProcedure;

            if (myDataSet == null)
                myDataSet = new DataSet();
            GetAdvtData();

            System.Console.ReadKey();
            connection.Close();
        }

        private static bool CanRequestNotifications()
        {
            SqlClientPermission permission =
                new SqlClientPermission(
                PermissionState.Unrestricted);
            try
            {
                permission.Demand();
                return true;
            }
            catch (System.Exception)
            {
                return false;
            }
        }



        private static void GetAdvtData()
        {
            myDataSet.Clear();
            // Ensure the command object does not have a notification object.
            command.Notification = null;
            // Create and bind the SqlDependency object to the command object.
            SqlDependency dependency = new SqlDependency(command,null,100);

            dependency.OnChange += new OnChangeEventHandler(dependency_OnChange);

            using (SqlDataAdapter adapter = new SqlDataAdapter(command))
            {
                adapter.Fill(myDataSet, "ControlRequest");

            }
        }

        private static void dependency_OnChange(object sender, SqlNotificationEventArgs e)
        {
            SqlDependency dependency =
        (SqlDependency)sender;

            dependency.OnChange -= dependency_OnChange;

            Console.WriteLine(e.Info.ToString() + e.Source.ToString());
            GetAdvtData();
        }

我的存储过程是:



IF OBJECT_ID('SchedulerSirasColcoDetailFetch') IS NOT NULL
 DROP PROCEDURE SchedulerSirasColcoDetailFetch
Go
PRINT 'Creating stored procedure SchedulerSirasColcoDetailFetch'
Go

CREATE PROCEDURE [dbo].[SchedulerSirasColcoDetailFetch]
AS
BEGIN


 SELECT Colco_Code AS 'CountryCode',Connection_String AS 'Url',Resend_Interval AS 'ResendInterval',
   Default_Encoding AS 'Encoding' FROM dbo.SirasColcoDetail
END

如果我将存储过程中的 select 语句复制为我的命令文本并将 commandType 设置为文本,则一切正常。

你能告诉我是什么问题吗???

提前非常感谢。

马赫什

4

1 回答 1

1

您应该检查 SqlNotificationEventArgs 参数的值。仅当TypeChange并且SourceData时,您通知了数据更改。

你会发现你没有收到数据更改的通知,而是错误的设置或错误的查询。您的查询和连接设置必须符合创建通知查询中指定的要求。

于 2009-11-19T16:50:23.900 回答