/* EF 3.0 要開啟 數據庫連接復用 MultipleActiveResultSets=true
* 不然會報 The connection does not support MultipleActiveResultSets
* 還會造成后繼查詢超時(可能因為前一寫入操作出異常事務無法提交造成)
* Execution Timeout Expired. The timeout period elapsed prior to completion of the operation or the server is not responding.
* */