https://blog.youkuaiyun.com/juanna_dingzh-cnhttps://blog.youkuaiyun.com/https://blog.youkuaiyun.com/juanna_ding/article/details/5681822https://blog.youkuaiyun.com/juanna_ding/article/details/5681822juanna_dingSun, 20 Jun 2010 16:08:00 +0800 作者：范里程　　来源：软件世界

古今之成大事业、大学问者，必经过三种之境界，今之UML应用的三重境界能给你带来什么呢？本文主要讨论了两个问题：一是为什么软件开发过程需要建模，二是建模为什么要使用UML语言。
先从几年前的一次争论谈起吧。2002年5月某IT杂志刊登了一篇知名学者高展先生的文章：《UML三大“硬伤”》，文章说UML“上不着天、下不着地、一盘散沙”，后即引来业界关于UML的一场大讨论。
在细述这场论战之前，且让我们先]]>https://blog.youkuaiyun.com/juanna_ding/article/details/5679815https://blog.youkuaiyun.com/juanna_ding/article/details/5679815juanna_dingSat, 19 Jun 2010 11:50:00 +0800https://blog.youkuaiyun.com/juanna_ding/article/details/5679770https://blog.youkuaiyun.com/juanna_ding/article/details/5679770juanna_dingSat, 19 Jun 2010 11:21:00 +0800https://blog.youkuaiyun.com/juanna_ding/article/details/5656147https://blog.youkuaiyun.com/juanna_ding/article/details/5656147juanna_dingTue, 08 Jun 2010 16:51:00 +0800    类图表示不同的实体(人、事物和数据)如何彼此相关，显示了系统的静态结构。类图可用于表示逻辑类，逻辑类通常就是业务人员所谈及的事物种类，比如摇滚乐队、CD、广播剧，或者贷款、住房抵押、汽车信贷及利率的抽象描述。类图还可用于表示实现类，实现类就是程序员要编写的类。实现类图与逻辑类图可能会用来描述一些相同的类。然而，实现类图与逻辑类图不会使用相同的描述属性。
　　类图是一个分为三个部分的矩形。最上面的部分显示类的名称，中间部分显示类的属性，最下面的部分显示类的操作(或者说“方法”)。]]>https://blog.youkuaiyun.com/juanna_ding/article/details/5655685https://blog.youkuaiyun.com/juanna_ding/article/details/5655685juanna_dingTue, 08 Jun 2010 14:47:00 +0800    回顾20世纪晚期--准确地说是1997年，OMG组织（Object Management Group对象管理组织）发布了统一建模语言（Unified Modeling Language，UML）。UML的目标之一就是为开发团队提供标准通用的设计语言来开发和构建计算机应用。UML提出了一套IT专业人员期待多年的统一的标准建模符号。通过使用UML，这些人员能够阅读和交流系统架构和设计规划--就像建筑工人多年来所使用的建筑设计图一样。
到了21世纪--准确地说是2003年，UML已经]]>https://blog.youkuaiyun.com/juanna_ding/article/details/5622884https://blog.youkuaiyun.com/juanna_ding/article/details/5622884juanna_dingTue, 25 May 2010 15:12:00 +0800https://blog.youkuaiyun.com/juanna_ding/article/details/5622804https://blog.youkuaiyun.com/juanna_ding/article/details/5622804juanna_dingTue, 25 May 2010 14:52:00 +0800https://blog.youkuaiyun.com/juanna_ding/article/details/5529803https://blog.youkuaiyun.com/juanna_ding/article/details/5529803juanna_dingMon, 26 Apr 2010 14:27:00 +0800mysql -h localhost -u root -p 数据库名称2.查询所有的数据库>show databases;3.选择数据库>use 数据库名;4.查询所有数据表>show tables;5.查询表的字段信息>desc 表名称;6.1.修改某个表的字段类型及指定为空或非空>alter table 表名称 change 字段名称 字段名称]]>https://blog.youkuaiyun.com/juanna_ding/article/details/5510658https://blog.youkuaiyun.com/juanna_ding/article/details/5510658juanna_dingWed, 21 Apr 2010 11:47:00 +0800https://blog.youkuaiyun.com/juanna_ding/article/details/5445595https://blog.youkuaiyun.com/juanna_ding/article/details/5445595juanna_dingFri, 02 Apr 2010 17:11:00 +0800https://blog.youkuaiyun.com/juanna_ding/article/details/5414396https://blog.youkuaiyun.com/juanna_ding/article/details/5414396juanna_dingThu, 25 Mar 2010 09:16:00 +0800https://blog.youkuaiyun.com/juanna_ding/article/details/5395957https://blog.youkuaiyun.com/juanna_ding/article/details/5395957juanna_dingFri, 19 Mar 2010 12:34:00 +0800https://blog.youkuaiyun.com/juanna_ding/article/details/5387835https://blog.youkuaiyun.com/juanna_ding/article/details/5387835juanna_dingWed, 17 Mar 2010 10:01:00 +0800https://blog.youkuaiyun.com/juanna_ding/article/details/5383992https://blog.youkuaiyun.com/juanna_ding/article/details/5383992juanna_dingTue, 16 Mar 2010 08:59:00 +0800https://blog.youkuaiyun.com/juanna_ding/article/details/5381188https://blog.youkuaiyun.com/juanna_ding/article/details/5381188juanna_dingMon, 15 Mar 2010 11:55:00 +0800https://blog.youkuaiyun.com/juanna_ding/article/details/5374471https://blog.youkuaiyun.com/juanna_ding/article/details/5374471juanna_dingFri, 12 Mar 2010 16:18:00 +0800https://blog.youkuaiyun.com/juanna_ding/article/details/5374260https://blog.youkuaiyun.com/juanna_ding/article/details/5374260juanna_dingFri, 12 Mar 2010 15:26:00 +0800https://blog.youkuaiyun.com/juanna_ding/article/details/5367153https://blog.youkuaiyun.com/juanna_ding/article/details/5367153juanna_dingThu, 11 Mar 2010 08:51:00 +0800https://blog.youkuaiyun.com/juanna_ding/article/details/5367145https://blog.youkuaiyun.com/juanna_ding/article/details/5367145juanna_dingThu, 11 Mar 2010 08:49:00 +0800https://blog.youkuaiyun.com/juanna_ding/article/details/5356636https://blog.youkuaiyun.com/juanna_ding/article/details/5356636juanna_dingMon, 08 Mar 2010 15:39:00 +0800