simple relational query language 中文意思是什麼

simple relational query language 解釋
簡單關系式查詢語言
  • simple : adj ( pler; plest)1 單純的;簡單的,簡易的;輕便的。2 質仆的,自然的,天真的;樸素的;率直的,...
  • relational : adj. 有關系的;親戚的;(特指語法上)表示關系的。adv. -ly
  • query : n 1 質問;詢問;疑問,懷疑。2 敢問,請問〈在疑問句前單獨使用〉。3 【印刷】(打在原稿或校樣上的)...
  • language : n 1 語言;(某民族,某國的)國語;語調,措詞。2 (談話者或作者所使用的)言語,語風,文風,文體。3...
  1. To persistence the objects there are two common approach. one approach is that structured query language ( sql ) codeis embedded in the source code of your classes. the other approach is that sql statements for your business classes are encapsulated in one or more " data classes. " the disadvantage is that it directly couples your business classes with the schema of your relational database, implying that a simple change such as renaming a column or porting to another database results in a rework of your source code

    實現在關系數據庫存取對象,常用的做法有:一種方法是在對象中直接編寫sql代碼來存取對象,另一種方法是將sql代碼在專門的數據類(或存儲過程)中編寫,但著兩種方式都使得對象模型與關系數據庫模式的耦合度大,不容易維護,因為關系數據庫模式的微小改動,都將導致應用程序的重新編譯。
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