sql-server - Azure SQL Server 错误此版本的 SQL Server 不支持语句 'RECEIVE MSG'

Question

我使用 SQLdependency 和 SignalR 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。但是上传到Azure服务器后，此方法会抛出以下错误:

Message":"An error has occurred.","ExceptionMessage":"Statement 'RECEIVE MSG' is not supported in this version of SQL Server.","ExceptionType":"System.Data.SqlClient.SqlException","StackTrace":" \r\nServer stack trace: \r\n at System.Data.SqlClient.SqlConnection.OnError(SqlException exception , Boolean breakConnection, Action`1 wrapCloseInAction)

可能是什么问题？

Answer 1

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。

要验证这一点，请使用命令SELECT name, is_broker_enabled FROM sys.databases。如果您的数据库显示结果“1”，则没关系，如果为“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。