Azure SQL Server 错误语句 'RECEIVE MSG' 在此版本的 SQL Server 中不受支持



我在SignalR中使用了SQLdependency来向用户显示警报。。代码如下:

public IEnumerable<AlertInfo> GetData(long UserId)
{
    using (var connection = new SqlConnection(ConfigurationManager.ConnectionStrings["yafnet"].ConnectionString))
    {
        connection.Open();
        using (SqlCommand command = new SqlCommand(@"SELECT [AlertID],[AlertNote],[AlertDetails],[AlertDate],[Location]
      FROM [dbo].[Alerts] where [UserID]=" + UserId + " AND [IsViewed]=0", connection))
        {
            // Make sure the command object does not already have
            // a notification object associated with it.
            command.Notification = null;
            SqlDependency.Stop(ConfigurationManager.ConnectionStrings["yafnet"].ConnectionString);
            SqlDependency.Start(ConfigurationManager.ConnectionStrings["yafnet"].ConnectionString);
            SqlDependency dependency = new SqlDependency(command);
            dependency.OnChange += new OnChangeEventHandler(dependency_OnChange);
            if (connection.State == ConnectionState.Closed)
                connection.Open();
            using (var reader = command.ExecuteReader())
                return reader.Cast<IDataRecord>()
                    .Select(x => new AlertInfo()
                    {
                        AlertID = x.GetInt64(0),
                        AlertNote = x.GetString(1),
                        AlertDetails = x.GetString(2),
                        AlertDate = x.GetDateTime(3),
                        Location = x.GetString(4)
                    }).ToList();
        }
    }
}

它在本地主机上运行良好。但在上传到Azure服务器后,此方法会抛出以下错误:

消息":"发生错误。","ExceptionMessage":"不支持语句'RECEIVE MSG'在此版本的SQL Server中。","ExceptionType":"System.Data.SqlClient.SqlException","StackTrace":"\\r\n服务器堆栈跟踪:\r\n位于System.Data.SqlClient.SqlConnection.OnError(SqlException异常,布尔breakConnection,操作`1 wrapCloseInAction)

可能是什么问题?

实际上,您的SQL Server数据库必须具有is_broker_enabled = 1。您需要检查它是否已启用。

要对此进行验证,请使用命令SELECT name, is_broker_enabled FROM sys.databases。如果您的数据库显示结果为"1",则可以;如果结果为"0",则必须使用此命令ALTER DATABASE yourdb SET ENABLE_BROKER启用它。

但坏消息是,Azure SQL数据库显示它已启用,但不再支持is_broker_enabled

为此,您需要将SQL Server的完整实例安装到Azure VM。

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