The early part of the 1990 s saw a greatly heightened interest in the object paradigm and related technologies 可以看到1990年的早期版本已經(jīng)對(duì)對(duì)象模式和相關(guān)技術(shù)有著濃厚的興趣。
The object paradigm is based on building applications out of objects that have both data and behavior , whereas the relational paradigm is based on storing data . the " impedance mismatch " comes into play when you look at the preferred approach to access 但是對(duì)象模型與關(guān)系數(shù)據(jù)庫(kù)不匹配:對(duì)象包含屬性和行為,對(duì)象之間有繼承、關(guān)聯(lián)等關(guān)系,而關(guān)系數(shù)據(jù)庫(kù)包含表、關(guān)系,表之間的關(guān)系使用主、外鍵表示。
Given that the object paradigm consists of a relatively small set of fundamental concepts including encapsulation , inheritance , and polymorphism , there was clearly a great deal of overlap and conceptual alignment across these methods - much of it obscured by notational and other differences of no consequence 考慮到對(duì)象模式包含了基本概念的相對(duì)較小的子集(包括封裝、繼承和多態(tài)) ,很明顯,在這些方法中存在非常多的重疊和概念上的結(jié)合- -大多數(shù)情況下是由于符號(hào)性的和其他并不重要的差異而使其變得很模糊不好理解。