利用XSLT把ADO记录集转换成XML
<div style="padding-right: 5.4pt; padding-left: 5.4pt; background: #e6e6e6; padding-bottom: 4px; width: 98%; padding-top: 4px;">http://www.cnblogs.com/Images/OutliningIndicators/None.gif由于XML（可扩展标记语言：eXtensibleMarkupLanguage）真正的平台无关性，它正在逐渐成为数据传输的主要介质。XML是一种自描述的语言，数据本身就已经包含了元数据，即关于数据本身的信息。例如：“孟子E章1757281793923net_lover1807581793923”这组数据，从字面很难看出它代表什么意思，也不清楚它有几个数据段组成，但是，如果用XML来做如下的描述，我们就可以清楚地看到每个数据段所代表的含义：http://www.cnblogs.com/Images/OutliningIndicators/None.gif
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http://www.cnblogs.com/Images/OutliningIndicators/None.gif<姓名>孟子E章</姓名>
http://www.cnblogs.com/Images/OutliningIndicators/None.gif<身高>175</身高>
http://www.cnblogs.com/Images/OutliningIndicators/None.gif<体重>72</体重>
http://www.cnblogs.com/Images/OutliningIndicators/None.gif<电话>81793923</电话>
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http://www.cnblogs.com/Images/OutliningIndicators/None.gif<姓名>net_lover</姓名>
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http://www.cnblogs.com/Images/OutliningIndicators/None.gif从上面的一段XML中，我们不但可以清楚地看到每一个数据代表的是什么意思了，而且还可以知道数据的分割位置。在我们平常的应用中，我们得到的结果可能是数组、集合或记录集的表现形式，我们该如何把它们转换成自描述的XML格式的数据呢？从数据形式上看，XML是简单的纯字符串的文本格式，字符串在传递时是非常简单、快速而且是容易的，数组在通过引用进行传递时有时是很慢的，而且处理起来很麻烦，而集合和记录集都是对象，在处理时会导致计算机性能的下降，并且这些对象都是与特定的平台相关联的，这就要求平台有内建的处理机制来处理对象的操作。XML已经是W3C的标准，是平台无关的，我们的计算机的唯一要求就是能够处理简单的XML字符串，即XML解析器，它能够解析XML字符串，能够通过一种接口很容易地把数据分解成一个个独立的数据段，以便我们能够进行访问。XML解析器都很小，性能也很好，在每种平台上都可以找到。一旦我们接收到XML数据并把它解析成上面的例子的样式后，我们就可以通过XSLT（eXstensibleStylesheetLanguageTransformations）把他们转换成不同的表现形式。利用XML的数据格式进行数据传输，将会使我们编写应用程序代码的工作更简单轻松，而且具有良好的可伸缩性。
http://www.cnblogs.com/Images/OutliningIndicators/None.gif下面，我们就看看如何来转换我们的数据。我们的例子是在MicrosoftWindows2000,IIS5,MSXML3和ADO2.6下编写的，样例数据采用MicrosoftSQLServer7.0自带的Northwind示例数据库。之所以采用SQLServer7而不采用支持XML的SQLServer2000，是考虑到通用性的原则，我们的目的是：处理不同类型的数据源得到的记录集，而不仅仅是象SQLServer2000那样的支持XML输出的数据源。使用ADO，是因为它形式多样，可以处理不同类型的数据源；使用XML，是因为它能够快速传输和解析。但本例的处理方法也适合在任何具有MicrsoftXML解析器，ADO2.5或以上版本的Windows,IIS,SQLServer的环境中。
http://www.cnblogs.com/Images/OutliningIndicators/None.gif为简单起见，我们仅选择单价小于等于20美圆，库存大于等于20，产品名称小于等于6个字符的产品：
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http://www.cnblogs.com/Images/OutliningIndicators/None.gif现在，我们就用3种方式把我们得到的记录集转换成XML格式。
http://www.cnblogs.com/Images/OutliningIndicators/None.gif首先，我们可以遍历整个记录集，采用XMLDOM(DocumentObjectModel)，建立XML节点树：
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http://www.cnblogs.com/Images/OutliningIndicators/None.gif现在，我们就得到了一个XMLDOM对象。这种方法对于记录集很大时性能并不理想，因为系统内存中要同时保存ADO记录集对象和XMLDOM对象。
http://www.cnblogs.com/Images/OutliningIndicators/None.gif第二个办法，遍历记录集，直接生成XML字符串本身：
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http://www.cnblogs.com/Images/OutliningIndicators/None.gif但是，以上两种方法最大的缺陷是不能够重用代码，我们把节点的名字都写死了，如果我们进行不同字段的查询，我们还必须手动更改我们的代码，以满足不同节点的需要。我们下面的方法将变得更加通用。
http://www.cnblogs.com/Images/OutliningIndicators/None.gif第三种方法：可重用的方法。
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http://www.cnblogs.com/Images/OutliningIndicators/None.gif一个更有效的方法，我们可以直接利用记录集内建的save方法，它能够自动地把记录集的内容转换成XML格式，我们调用save方法后，我们就可以立即释放内存中的记录集对象实例。save方法有两个参数：一个是XML要保存的地方，一个是指示符，标明数据以何种格式保存。我们可以把数据保存成XMLDOM对象（ADOSTREAM对象），也可以直接保存成ASPRESPONSE对象，为通用起见，我们保存成XMLDOM，第二个参数用adPersistXMLADO常量。方法如下：
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http://www.cnblogs.com/Images/OutliningIndicators/None.gif这种方法方便快捷，而且不容易出错，对不同的查询，也不用手动更改节点名字。但是，这种方法产生的XML不够简洁，看看它产生的结果：
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http://www.cnblogs.com/Images/OutliningIndicators/None.gifADO自动产生的XML包含了schema信息，它描述这个XML里允许有什么节点和属性以及采用何种数据类型，而且数据节点也增加了名称空间。schema信息在需要数据验证的地方或进行更复杂的处理或许很有用，但是，大多数情况下，我们使用的是瘦客户机，我们不需要schema信息。我们可以利用XSLT来分离出我们想要的信息，去掉多余的信息。因此，我们编写下面的“DataCleaner.xsl”:
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http://www.cnblogs.com/Images/OutliningIndicators/None.gif<xsl:templatematch="/">
http://www.cnblogs.com/Images/OutliningIndicators/None.gif<xsl:elementname="xml">
http://www.cnblogs.com/Images/OutliningIndicators/None.gif<xsl:for-eachselect="/xml/rs:data/z:row">
http://www.cnblogs.com/Images/OutliningIndicators/None.gif<xsl:elementname="row">
http://www.cnblogs.com/Images/OutliningIndicators/None.gif<xsl:for-eachselect="@*">
http://www.cnblogs.com/Images/OutliningIndicators/None.gif<xsl:elementname="{name()}">
http://www.cnblogs.com/Images/OutliningIndicators/None.gif<xsl:value-ofselect="."/>
http://www.cnblogs.com/Images/OutliningIndicators/None.gif</xsl:element>
http://www.cnblogs.com/Images/OutliningIndicators/None.gif</xsl:for-each>
http://www.cnblogs.com/Images/OutliningIndicators/None.gif</xsl:element>
http://www.cnblogs.com/Images/OutliningIndicators/None.gif</xsl:for-each>
http://www.cnblogs.com/Images/OutliningIndicators/None.gif</xsl:element>
http://www.cnblogs.com/Images/OutliningIndicators/None.gif</xsl:template>
http://www.cnblogs.com/Images/OutliningIndicators/None.gif
http://www.cnblogs.com/Images/OutliningIndicators/None.gif</xsl:stylesheet>
http://www.cnblogs.com/Images/OutliningIndicators/None.gif
http://www.cnblogs.com/Images/OutliningIndicators/None.gif这个XSLT具有可重用的特性，对于不同的查询结果都适用，下面就是如何使用这个XSLT的例子：
http://www.cnblogs.com/Images/OutliningIndicators/None.gif
http://www.cnblogs.com/Images/OutliningIndicators/None.gif<%
http://www.cnblogs.com/Images/OutliningIndicators/None.gifDimstrCleanXML,objXMLDOM_XSLT
http://www.cnblogs.com/Images/OutliningIndicators/None.gif
http://www.cnblogs.com/Images/OutliningIndicators/None.gifSetobjXMLDOM_XSLT=CreateObject("MSXML2.DOMDocument")
http://www.cnblogs.com/Images/OutliningIndicators/None.gifobjXMLDOM_XSLT.load(Server.MapPath("DataCleaner.xsl"))
http://www.cnblogs.com/Images/OutliningIndicators/None.gifstrCleanXML=objXMLDOM.transformNode(objXMLDOM_XSLT)
http://www.cnblogs.com/Images/OutliningIndicators/None.gif
http://www.cnblogs.com/Images/OutliningIndicators/None.gifSetobjXMLDOM=Nothing
http://www.cnblogs.com/Images/OutliningIndicators/None.gifSetobjXMLDOM_XSLT=Nothing
http://www.cnblogs.com/Images/OutliningIndicators/None.gif%>
http://www.cnblogs.com/Images/OutliningIndicators/None.gif
http://www.cnblogs.com/Images/OutliningIndicators/None.gif经过上面的处理以后，strClaenXML就是我们所想要的XML字符串了。
http://www.cnblogs.com/Images/OutliningIndicators/None.gif
http://www.cnblogs.com/Images/OutliningIndicators/None.gif<xml>
http://www.cnblogs.com/Images/OutliningIndicators/None.gif<row>
http://www.cnblogs.com/Images/OutliningIndicators/None.gif<ProductName>Chai</ProductName>
http://www.cnblogs.com/Images/OutliningIndicators/None.gif<UnitPrice>18</UnitPrice>
http://www.cnblogs.com/Images/OutliningIndicators/None.gif<UnitsInStock>39</UnitsInStock>
http://www.cnblogs.com/Images/OutliningIndicators/None.gif</row>
http://www.cnblogs.com/Images/OutliningIndicators/None.gif<row>
http://www.cnblogs.com/Images/OutliningIndicators/None.gif<ProductName>Konbu</ProductName>
http://www.cnblogs.com/Images/OutliningIndicators/None.gif<UnitPrice>6</UnitPrice>
http://www.cnblogs.com/Images/OutliningIndicators/None.gif<UnitsInStock>24</UnitsInStock>
http://www.cnblogs.com/Images/OutliningIndicators/None.gif</row>
http://www.cnblogs.com/Images/OutliningIndicators/None.gif</xml>
http://www.cnblogs.com/Images/OutliningIndicators/None.gif
http://www.cnblogs.com/Images/OutliningIndicators/None.gif上面这种格式的XML字符串是我们经常见到的节点集的样式，如果您不想把字段处理成节点，而把它处理成属性节点，那么我们只需对DataCleaber.xsl稍加改动即可：
http://www.cnblogs.com/Images/OutliningIndicators/None.gif
http://www.cnblogs.com/Images/OutliningIndicators/None.gif<?xmlversion="1.0"?>
http://www.cnblogs.com/Images/OutliningIndicators/None.gif<xsl:stylesheetversion="1.0"
http://www.cnblogs.com/Images/OutliningIndicators/None.gifxmlns:xsl="http://www.w3.org/1999/XSL/Transform"
http://www.cnblogs.com/Images/OutliningIndicators/None.gifxmlns:s="uuid:BDC6E3F0-6DA3-11d1-A2A3-00AA00C14882"
http://www.cnblogs.com/Images/OutliningIndicators/None.gifxmlns:dt="uuid:C2F41010-65B3-11d1-A29F-00AA00C14882"
http://www.cnblogs.com/Images/OutliningIndicators/None.gifxmlns:rs="urn:schemas-microsoft-com:rowset"
http://www.cnblogs.com/Images/OutliningIndicators/None.gifxmlns:z="#RowsetSchema">
http://www.cnblogs.com/Images/OutliningIndicators/None.gif
http://www.cnblogs.com/Images/OutliningIndicators/None.gif<xsl:outputomit-xml-declaration="yes"/>
http://www.cnblogs.com/Images/OutliningIndicators/None.gif
http://www.cnblogs.com/Images/OutliningIndicators/None.gif<xsl:templatematch<span s
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