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📄 n层设计基础续.htm

📁 UML软件工程组织面向对象实例文档 内涵GIF 图片和网络文件格式
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style="mso-bidi-font-style: normal"><SPAN 
style="FONT-SIZE: 18pt; FONT-FAMILY: 宋体; LETTER-SPACING: 0.3pt; mso-bidi-font-size: 10.0pt; mso-fareast-language: ZH-CN; mso-ascii-font-family: 華康中黑體; mso-hansi-font-family: 'Times New Roman'">前言</SPAN></I><I 
style="mso-bidi-font-style: normal"><SPAN lang=EN-US 
style="FONT-SIZE: 18pt; FONT-FAMILY: 華康中黑體; LETTER-SPACING: 0.3pt; mso-bidi-font-size: 10.0pt; mso-fareast-language: ZH-CN"><O:P> 
</O:P></SPAN></I></B></P>
<P class=MsoNormal><SPAN lang=EN-US 
style="LETTER-SPACING: 0.3pt; mso-fareast-font-family: 宋体; mso-font-kerning: 8.0pt; mso-fareast-language: ZH-CN; mso-spacerun: yes">&nbsp;&nbsp;&nbsp; 
</SPAN><SPAN 
style="FONT-FAMILY: 宋体; LETTER-SPACING: 0.3pt; mso-font-kerning: 8.0pt; mso-fareast-language: ZH-CN; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在本期的「</SPAN><SPAN 
lang=EN-US 
style="LETTER-SPACING: 0.3pt; mso-fareast-font-family: 宋体; mso-font-kerning: 8.0pt; mso-fareast-language: ZH-CN">N-tier</SPAN><SPAN 
style="FONT-FAMILY: 宋体; LETTER-SPACING: 0.3pt; mso-font-kerning: 8.0pt; mso-fareast-language: ZH-CN; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">架构的基本模式」文章里,介绍了</SPAN><SPAN 
lang=EN-US 
style="LETTER-SPACING: 0.3pt; mso-fareast-font-family: 宋体; mso-font-kerning: 8.0pt; mso-fareast-language: ZH-CN">5</SPAN><SPAN 
style="FONT-FAMILY: 宋体; LETTER-SPACING: 0.3pt; mso-font-kerning: 8.0pt; mso-fareast-language: ZH-CN; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">个基本模式。本文将基于这些基本模式,而继续延伸出更多的实用模式。</SPAN><SPAN 
lang=EN-US 
style="LETTER-SPACING: 0.3pt; mso-font-kerning: 8.0pt; mso-fareast-language: ZH-CN"><O:P> 
</O:P></SPAN></P>
<P class=MsoNormal style="MARGIN-BOTTOM: 6pt"><SPAN lang=EN-US 
style="LETTER-SPACING: 0.3pt; mso-fareast-font-family: 宋体; mso-font-kerning: 8.0pt; mso-fareast-language: ZH-CN; mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp; 
</SPAN><SPAN 
style="FONT-FAMILY: 宋体; LETTER-SPACING: 0.3pt; mso-font-kerning: 8.0pt; mso-fareast-language: ZH-CN; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">兹回忆基本模式</SPAN><SPAN 
lang=EN-US 
style="FONT-FAMILY: Monotype Sorts; LETTER-SPACING: 0.3pt; mso-font-kerning: 8.0pt; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman; mso-char-type: symbol; mso-symbol-font-family: Monotype Sorts">&sup1;</SPAN><SPAN 
style="FONT-FAMILY: 宋体; LETTER-SPACING: 0.3pt; mso-font-kerning: 8.0pt; mso-fareast-language: ZH-CN; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的基本结构为,如图</SPAN><SPAN 
lang=EN-US 
style="LETTER-SPACING: 0.3pt; mso-fareast-font-family: 宋体; mso-font-kerning: 8.0pt; mso-fareast-language: ZH-CN">1</SPAN><SPAN 
style="FONT-FAMILY: 宋体; LETTER-SPACING: 0.3pt; mso-font-kerning: 8.0pt; mso-fareast-language: ZH-CN; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">所示。其中的对象角色为:</SPAN><SPAN 
lang=EN-US 
style="LETTER-SPACING: 0.3pt; mso-font-kerning: 8.0pt; mso-fareast-language: ZH-CN"><O:P> 
</O:P></SPAN></P>
<P class=MsoNormal 
style="MARGIN: 0cm 0cm 6pt 14.2pt; TEXT-INDENT: -14.2pt"><SPAN lang=EN-US 
style="FONT-FAMILY: Monotype Sorts; LETTER-SPACING: 0.3pt; mso-font-kerning: 8.0pt; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman; mso-char-type: symbol; mso-symbol-font-family: Monotype Sorts">s</SPAN><SPAN 
style="FONT-FAMILY: 宋体; LETTER-SPACING: 0.3pt; mso-font-kerning: 8.0pt; mso-fareast-language: ZH-CN; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">有个</SPAN><SPAN 
lang=EN-US 
style="LETTER-SPACING: 0.3pt; mso-fareast-font-family: 宋体; mso-font-kerning: 8.0pt; mso-fareast-language: ZH-CN">stateful</SPAN><SPAN 
style="FONT-FAMILY: 宋体; LETTER-SPACING: 0.3pt; mso-font-kerning: 8.0pt; mso-fareast-language: ZH-CN; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的对象含有企业营运规则</SPAN><SPAN 
lang=EN-US 
style="LETTER-SPACING: 0.3pt; mso-fareast-font-family: 宋体; mso-font-kerning: 8.0pt; mso-fareast-language: ZH-CN">(business 
rules)</SPAN><SPAN 
style="FONT-FAMILY: 宋体; LETTER-SPACING: 0.3pt; mso-font-kerning: 8.0pt; mso-fareast-language: ZH-CN; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">,可称为</SPAN><SPAN 
lang=EN-US 
style="LETTER-SPACING: 0.3pt; mso-fareast-font-family: 宋体; mso-font-kerning: 8.0pt; mso-fareast-language: ZH-CN">business</SPAN><SPAN 
style="FONT-FAMILY: 宋体; LETTER-SPACING: 0.3pt; mso-font-kerning: 8.0pt; mso-fareast-language: ZH-CN; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">对象。</SPAN><SPAN 
lang=EN-US style="LETTER-SPACING: 0.3pt; mso-font-kerning: 8.0pt"><O:P> 
</O:P></SPAN></P>
<P class=MsoNormal style="MARGIN-LEFT: 14.2pt; TEXT-INDENT: -14.2pt"><SPAN 
lang=EN-US 
style="FONT-FAMILY: Monotype Sorts; LETTER-SPACING: 0.3pt; mso-font-kerning: 8.0pt; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman; mso-char-type: symbol; mso-symbol-font-family: Monotype Sorts">s</SPAN><SPAN 
lang=EN-US 
style="LETTER-SPACING: 0.3pt; mso-fareast-font-family: 宋体; mso-font-kerning: 8.0pt; mso-fareast-language: ZH-CN"> 
</SPAN><SPAN 
style="FONT-FAMILY: 宋体; LETTER-SPACING: 0.3pt; mso-font-kerning: 8.0pt; mso-fareast-language: ZH-CN; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">有个</SPAN><SPAN 
lang=EN-US 
style="LETTER-SPACING: 0.3pt; mso-fareast-font-family: 宋体; mso-font-kerning: 8.0pt; mso-fareast-language: ZH-CN">stateless</SPAN><SPAN 
style="FONT-FAMILY: 宋体; LETTER-SPACING: 0.3pt; mso-font-kerning: 8.0pt; mso-fareast-language: ZH-CN; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">对象含有</SPAN><SPAN 
lang=EN-US 
style="LETTER-SPACING: 0.3pt; mso-fareast-font-family: 宋体; mso-font-kerning: 8.0pt; mso-fareast-language: ZH-CN">SQL</SPAN><SPAN 
style="FONT-FAMILY: 宋体; LETTER-SPACING: 0.3pt; mso-font-kerning: 8.0pt; mso-fareast-language: ZH-CN; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">指令负责存取数据库,可称为</SPAN><SPAN 
lang=EN-US 
style="LETTER-SPACING: 0.3pt; mso-fareast-font-family: 宋体; mso-font-kerning: 8.0pt; mso-fareast-language: ZH-CN">persist</SPAN><SPAN 
style="FONT-FAMILY: 宋体; LETTER-SPACING: 0.3pt; mso-font-kerning: 8.0pt; mso-fareast-language: ZH-CN; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">对象。</SPAN><SPAN 
lang=EN-US style="LETTER-SPACING: 0.3pt; mso-font-kerning: 8.0pt"><O:P> 
</O:P></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US 
style="LETTER-SPACING: 0.3pt; mso-font-kerning: 8.0pt">&nbsp;<O:P> 
</O:P></SPAN></P>
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</SPAN><I style="mso-bidi-font-style: normal"><SPAN 
style="FONT-FAMILY: 宋体; LETTER-SPACING: 0.3pt; mso-fareast-language: ZH-CN; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">图</SPAN><SPAN 
lang=EN-US 
style="LETTER-SPACING: 0.3pt; mso-fareast-font-family: 宋体; mso-fareast-language: ZH-CN">1</SPAN><SPAN 
style="FONT-FAMILY: 宋体; LETTER-SPACING: 0.3pt; mso-fareast-language: ZH-CN; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、基本模式</SPAN><SPAN 
lang=EN-US 
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lang=EN-US 
style="LETTER-SPACING: 0.3pt; mso-font-kerning: 8.0pt; mso-fareast-language: ZH-CN"><O:P> 
</O:P></SPAN></I></P>
<P class=MsoNormal><SPAN lang=EN-US 
style="LETTER-SPACING: 0.3pt; mso-font-kerning: 8.0pt; mso-fareast-language: ZH-CN">&nbsp;<O:P> 
</O:P></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US 
style="LETTER-SPACING: 0.3pt; mso-fareast-font-family: 宋体; mso-fareast-language: ZH-CN; mso-spacerun: yes">&nbsp;&nbsp;&nbsp; 
</SPAN><SPAN 
style="FONT-FAMILY: 宋体; LETTER-SPACING: 0.3pt; mso-font-kerning: 8.0pt; mso-fareast-language: ZH-CN; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在「</SPAN><SPAN 
lang=EN-US 
style="LETTER-SPACING: 0.3pt; mso-fareast-font-family: 宋体; mso-font-kerning: 8.0pt; mso-fareast-language: ZH-CN">N-tier</SPAN><SPAN 
style="FONT-FAMILY: 宋体; LETTER-SPACING: 0.3pt; mso-font-kerning: 8.0pt; mso-fareast-language: ZH-CN; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">架构的基本模式」一</SPAN><SPAN 
style="FONT-FAMILY: 宋体; LETTER-SPACING: 0.3pt; mso-fareast-language: ZH-CN; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">文里,也提到:学会模式并非终极目的,而必须能将模式修正成为您的特殊环境,创造出最佳的、最适用您自己的模式,才算完美。所以除了学习模式之外,也必须学习创造新模式。</SPAN><SPAN 
lang=EN-US 
style="LETTER-SPACING: 0.3pt; mso-font-kerning: 8.0pt; mso-fareast-language: ZH-CN"><O:P> 
</O:P></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US 
style="LETTER-SPACING: 0.3pt; mso-fareast-font-family: 宋体; mso-font-kerning: 8.0pt; mso-fareast-language: ZH-CN; mso-spacerun: yes">&nbsp;&nbsp;&nbsp; 
</SPAN><SPAN 
style="FONT-FAMILY: 宋体; LETTER-SPACING: 0.3pt; mso-font-kerning: 8.0pt; mso-fareast-language: ZH-CN; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">于此,就跟您一起来进行一趟模式的创作之旅,将模式</SPAN><SPAN 
lang=EN-US 
style="FONT-FAMILY: Monotype Sorts; LETTER-SPACING: 0.3pt; mso-font-kerning: 8.0pt; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman; mso-char-type: symbol; mso-symbol-font-family: Monotype Sorts">&sup1;</SPAN><SPAN 
style="FONT-FAMILY: 宋体; LETTER-SPACING: 0.3pt; mso-font-kerning: 8.0pt; mso-fareast-language: ZH-CN; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">继续延伸出而创造出更多的模式,并实际应用于</SPAN><SPAN 
lang=EN-US 
style="LETTER-SPACING: 0.3pt; mso-fareast-font-family: 宋体; mso-font-kerning: 8.0pt; mso-fareast-language: ZH-CN">n-tier</SPAN><SPAN 
style="FONT-FAMILY: 宋体; LETTER-SPACING: 0.3pt; mso-font-kerning: 8.0pt; mso-fareast-language: ZH-CN; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">系统的开发工作上。</SPAN><SPAN 
lang=EN-US 
style="LETTER-SPACING: 0.3pt; mso-font-kerning: 8.0pt; mso-fareast-language: ZH-CN"><O:P> 
</O:P></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US 
style="LETTER-SPACING: 0.3pt; mso-fareast-font-family: 宋体; mso-font-kerning: 8.0pt; mso-fareast-language: ZH-CN; mso-spacerun: yes">&nbsp;&nbsp;&nbsp; 
</SPAN><SPAN 
style="FONT-FAMILY: 宋体; LETTER-SPACING: 0.3pt; mso-font-kerning: 8.0pt; mso-fareast-language: ZH-CN; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">模式的修正弹性很大,连对象的名称皆是可视您的喜好而改变,只要您确定这样的改变是有利的,就行了。例如:</SPAN><SPAN 
lang=EN-US 
style="LETTER-SPACING: 0.3pt; mso-font-kerning: 8.0pt; mso-fareast-language: ZH-CN"><O:P> 

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