error retrieving information from user datastore devices 從用戶數(shù)據(jù)存儲中檢索信息時發(fā)生錯誤(設備)
first, we define the data that we will store in the datastore 首先,定義要存儲在數(shù)據(jù)存儲器中的數(shù)據(jù)。
simulated data access objects essentially simulate a back-end datastore 模擬數(shù)據(jù)訪問對象實際上模擬后端數(shù)據(jù)存儲。
in this case, i start by writing a dao to provide search capabilities on the product catalog datastore 在這個示例中,我從編寫dao開始,用它提供對產(chǎn)品目錄數(shù)據(jù)存儲的搜索功能。
any other program that knows the attributes of our objects can use the same datastore more on this under 任何知道對象屬性的其它程序都可以使用同樣的數(shù)據(jù)存儲器(這方面的詳細信息在