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29.6.2 事务处理的属性
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29.6.2 事务处理的属性
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2006-10-13 14:41:00
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<div style='float:left;width:49%'>·<a href='100165757.htm'>29.5 客户应用程序</a></div><div style='float:right;width:49%'>·<a href='100165758.htm'>29.6 事务处理</a></div><div style='float:left;width:49%'>·<a href='100165759.htm'>29.6.1 ACID属性</a></div><div style='float:right;width:49%'>·<a href='100165761.htm'>29.6.3 事务处理的结果</a></div><div style='float:left;width:49%'>·<a href='100165762.htm'>29.6.4 示例应用程序(1)</a></div><div style='float:right;width:49%'>·<a href='100165763.htm'>29.6.4 示例应用程序(2)</a></div></div>
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<div id="text"> <link href="css.css" rel="stylesheet" type="text/css" /><h3 style='margin-top:8.15pt;margin-right:0cm;FTEL:8.15pt;margin-left:
0cm'><span lang=EN-US>29.6.2 </span><span style='font-family:黑体'>事务处理的属性</span></h3>
<p class=MsoNormal><span style='font-family:宋体'>服务组件可以用</span><span lang=EN-US>[Transaction]</span><span
style='font-family:宋体'>属性标记，以定义组件是否需要事务处理，以及如何进行事务处理。</span></p>
<p class=MsoNormal><span style='font-family:宋体'>表</span><span lang=EN-US>29-2</span><span
style='font-family:宋体'>给出了</span><span lang=EN-US>TransactionOption</span><span
style='font-family:宋体'>值及其说明的列表。</span></p>
<p class=a5 style='margin-top:8.15pt'><span style='font-family:黑体'>表</span><span
lang=EN-US> 29-2</span></p>
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border-left:none;padding:0cm 5.4pt 0cm 5.4pt'>
<p class=a2><span lang=EN-US>TransactionOption</span><span style='font-family:
黑体'>值</span></p>
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border-left:none;border-bottom:solid windowtext 1.0pt;border-right:none;
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<p class=a2><span style='font-family:黑体'>说</span><span lang=EN-US>
</span><span style='font-family:黑体'>明</span></p>
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<p class=a4 style='margin-left:10.7pt'><span lang=EN-US>Required</span></p>
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padding:0cm 5.4pt 0cm 5.4pt'>
<p class=a4 style='margin-left:10.7pt'><span style='font-family:宋体'>把</span><span
lang=EN-US>[Transaction]</span><span style='font-family:宋体'>属性设置为</span><span
lang=EN-US>TransactionOption.Required</span><span style='font-family:宋体'>，表示组件在事务处理中运行。如果已经创建了一个事务处理，组件就运行在这个事务处理中。如果事务处理不存在，就创建一个</span></p>
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padding:0cm 5.4pt 0cm 5.4pt'>
<p class=a4 style='margin-left:10.7pt'><span lang=EN-US>RequiresNew</span></p>
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<p class=a4 style='margin-left:10.7pt'><span lang=EN-US>TransactionOption.RequiresNew</span><span
style='font-family:宋体'>总是会创建一个新的事务处理。组件从来不参与调用者所在的事务处理</span></p>
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<p class=a4 style='margin-left:10.7pt'><span lang=EN-US>Supported</span></p>
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<p class=a4 style='margin-left:10.7pt'><span style='font-family:宋体'>使用</span><span
lang=EN-US>TransactionOption.Supported</span><span style='font-family:宋体'>，组件就不需要事务处理了。但是，如果这些组件需要事务处理，事务处理就会位于调用者和被调用的组件中。</span></p>
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none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;
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<p class=a4 style='margin-left:10.7pt'><span lang=EN-US>NotSupported</span></p>
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<p class=a4 style='margin-left:10.7pt'><span style='font-family:宋体'>选项</span><span
lang=EN-US>TransactionOption.NotSupported</span><span style='font-family:
宋体'>表示无论调用者是否有事务处理，组件从来都不运行在事务处理中</span></p>
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<td width=149 valign=top style='width:111.75pt;border-top:none;border-left:
none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;
padding:0cm 5.4pt 0cm 5.4pt'>
<p class=a4 style='margin-left:10.7pt'><span lang=EN-US>Disabled</span></p>
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<td width=440 valign=top style='width:329.9pt;border:none;border-bottom:solid windowtext 1.0pt;
padding:0cm 5.4pt 0cm 5.4pt'>
<p class=a4 style='margin-left:10.7pt'><span lang=EN-US>TransactionOption.Disabled</span><span
style='font-family:宋体'>表示忽略当前环境的事务处理</span></p>
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<p class=MsoNormal><span style='font-family:宋体'>图</span><span lang=EN-US>29-5</span><span
style='font-family:宋体'>显示了不同的事务处理配置的多个组件。客户调用组件</span><span lang=EN-US>A</span><span
style='font-family:宋体'>。因为组件</span><span lang=EN-US>A</span><span
style='font-family:宋体'>是用</span><span lang=EN-US>TransactionOption.Required</span><span
style='font-family:宋体'>配置的，而且以前不存在事务处理，所以创建一个新的事务处理</span><span lang=EN-US>1</span><span
style='font-family:宋体'>。组件</span><span lang=EN-US>A</span><span
style='font-family:宋体'>调用组件</span><span lang=EN-US>B</span><span
style='font-family:宋体'>，组件</span><span lang=EN-US>B</span><span
style='font-family:宋体'>调用组件</span><span lang=EN-US>C</span><span
style='font-family:宋体'>。因为组件</span><span lang=EN-US>B</span><span
style='font-family:宋体'>是用</span><span lang=EN-US>TransactionOption.Supported</span><span
style='font-family:宋体'>配置的，而且组件</span><span lang=EN-US>C</span><span
style='font-family:宋体'>的配置是</span><span lang=EN-US>TransactionOption.Required</span><span
style='font-family:宋体'>，所以组件</span><span lang=EN-US>A</span><span
style='font-family:宋体'>、</span><span lang=EN-US>B</span><span style='font-family:
宋体'>和</span><span lang=EN-US>C</span><span style='font-family:宋体'>都使用同一个事务处理环境。如果组件</span><span
lang=EN-US>B</span><span style='font-family:宋体'>是用</span><span lang=EN-US>NotSupported</span><span
style='font-family:宋体'>配置的，组件</span><span lang=EN-US>C</span><span
style='font-family:宋体'>就会得到一个新的事务处理。组件</span><span lang=EN-US>D</span><span
style='font-family:宋体'>是用</span><span lang=EN-US>TransactionOption.RequiresNew</span><span
style='font-family:宋体'>配置的，所以在组件</span><span lang=EN-US>A</span><span
style='font-family:宋体'>调用组件</span><span lang=EN-US>D</span><span
style='font-family:宋体'>时，会创建一个新的事务处理。</span></p>
<p align=center><span lang=EN-US><img width=438 height=278
src="29/image005.jpg"></span></p>
<p align=center style='FTEL:8.15pt'><span style='font-family:宋体'>图</span><span
lang=EN-US> 29-5</span></p>
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