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[SqlException (0x80131904): 鍦ㄤ笌 SQL Server 寤虹珛杩炴帴鏃跺嚭鐜颁笌缃戠粶鐩稿叧鐨勬垨鐗瑰畾浜庡疄渚嬬殑閿欒銆傛湭鎵惧埌鎴栨棤娉曡闂湇鍔″櫒銆傝楠岃瘉瀹炰緥鍚嶇О鏄惁姝ｇ‘骞朵笖 SQL Server 宸查厤缃负鍏佽杩滅▼杩炴帴銆 (provider: 鍛藉悕绠￠亾鎻愪緵绋嬪簭, error: 40 - 鏃犳硶鎵撳紑鍒 SQL Server 鐨勮繛鎺?]
   System.Data.ProviderBase.DbConnectionPool.GetConnection(DbConnection owningObject) +428
   System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection) +65
   System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory) +117
   System.Data.SqlClient.SqlConnection.Open() +122
   Discuz.Data.DbHelper.PrepareCommand(DbCommand command, DbConnection connection, DbTransaction transaction, CommandType commandType, String commandText, DbParameter[] commandParameters, Boolean& mustCloseConnection) +69
   Discuz.Data.DbHelper.ExecuteNonQuery(DbConnection connection, CommandType commandType, String commandText, DbParameter[] commandParameters) +60
   Discuz.Data.DbHelper.ExecuteNonQuery(CommandType commandType, String commandText, DbParameter[] commandParameters) +110
   Discuz.Data.SqlServer.DataProvider.GetLastExecuteScheduledEventDateTime(String key, String serverName) +158
   Discuz.Forum.ScheduledEvents.Event.get_ShouldExecute() +79
   Discuz.Forum.ScheduledEvents.EventManager.Execute() +195
   Discuz.Forum.HttpModule.ScheduledEventWorkCallback(Object sender) +30