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转载 ORM: Object Relational Mapping(对象关系映射 )

对象关系映射(英语:Object Relational Mapping,简称ORM,或O/RM,或O/R mapping),是一种程序技术,用于实现面向对象编程语言里不同类型系统的数据之间的转换。从效果上说,它其实是创建了一个可在编程语言里使用的“虚拟对象数据库”。 面向对象是从软件工程基本原则(如耦合、聚合、封装)的基础上发展起来的,而关系数据库则是从数学理论发展而来的,两套理论存在显著的区别

2014-10-09 10:52:21 842

Beginning iOS 6 Development Exploring the iOS SDK.pdf

This book is a guide to help you get started down the path to creating your own iOS applications. Our goal is to get you past the initial difficulties, to help you understand the way iOS applications work and how they are built. As you work your way through this book, you will create a number of small applications, each designed to highlight specific iOS features and to show you how to control or interact with those features. If you combine the foundation you’ll gain through this book with your own creativity and determination, and then add in the extensive and well-written documentation provided by Apple, you’ll have everything you need to build your own professional iPhone and iPad applications.

2014-09-02

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