It provides basic access operations to retrieve and store 它提供了對在http會話中獲取和存儲
In addition , certain data access operations may only be valid if run under the caller s context 此外,某些數(shù)據(jù)訪問操作可能只有在調(diào)用方的上下文中運行時才有效。
Meaning that the method or function performs read - only data - access operations , such as executing select statements (意味著方法或函數(shù)執(zhí)行只讀數(shù)據(jù)訪問操作,如執(zhí)行select語句) 。
Read meaning that the method or function perform read - only data - access operations , such as executing select statements (表示該方法或函數(shù)執(zhí)行只讀的數(shù)據(jù)訪問操作,如執(zhí)行select語句) 。
Business logic should be in a higher layer of your application . only data access operations should be permitted 業(yè)務(wù)邏輯應(yīng)該在你的應(yīng)用的一個高一些的層次里。持久層里僅僅允許數(shù)據(jù)存取操作。