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CRUD的定义
CRUD是指在做计算处理时的增加、查询（重新得到数据）、更新和删除几个单词的首字母简写。主要被用在描述软件系统中数据库或者持久层的基本操作功能。
In computing, CRUD is an acronym for create, retrieve, update, and delete. It is used to refer to the basic functions of a database or persistence layer in a software system.
CRUD是指在做计算处理时的增加、查询（重新得到数据）、更新和删除几个单词的首字母简写。主要被用在描述软件系统中数据库或者持久层的基本操作功能。
In computing, CRUD is an acronym for create, retrieve, update, and delete. It is used to refer to the basic functions of a database or persistence layer in a software system.
- C reate new records
- R etrieve existing records
- U pdate existing records
- D elete existing records.
内容参考：http://www.cnblogs.com/jianjunli/archive/2007/02/09/354448.html
