100165651.htm
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<p class="a6" style="BACKGROUND: #f2f2f2; MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 13.5pt; FTEL: 18.45pt"><span lang="EN-US"> diffgr:hasChanges="inserted"></span></p>
<p class="a6" style="BACKGROUND: #f2f2f2; MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 13.5pt; FTEL: 18.45pt"><span lang="EN-US"> <ProductID>100</ProductID></span></p>
<p class="a6" style="BACKGROUND: #f2f2f2; MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 13.5pt; FTEL: 18.45pt"><span lang="EN-US"> <ProductName>This is the new product</ProductName></span></p>
<p class="a6" style="BACKGROUND: #f2f2f2; MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 13.5pt; FTEL: 18.45pt"><span lang="EN-US"> <SupplierID>12</SupplierID></span></p>
<p class="a6" style="BACKGROUND: #f2f2f2; MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 13.5pt; FTEL: 18.45pt"><span lang="EN-US"> <CategoryID>2</CategoryID></span></p>
<p class="a6" style="BACKGROUND: #f2f2f2; MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 13.5pt; FTEL: 18.45pt"><span lang="EN-US"> <QuantityPerUnit>12</QuantityPerUnit></span></p>
<p class="a6" style="BACKGROUND: #f2f2f2; MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 13.5pt; FTEL: 18.45pt"><span lang="EN-US"> <UnitPrice>23</UnitPrice></span></p>
<p class="a6" style="BACKGROUND: #f2f2f2; MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 13.5pt; FTEL: 18.45pt"><span lang="EN-US"> <UnitsInStock>5</UnitsInStock></span></p>
<p class="a6" style="BACKGROUND: #f2f2f2; MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 13.5pt; FTEL: 18.45pt"><span lang="EN-US"> <UnitsOnOrder>0</UnitsOnOrder></span></p>
<p class="a6" style="BACKGROUND: #f2f2f2; MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 13.5pt; FTEL: 18.45pt"><span lang="EN-US"> <ReorderLevel>1</ReorderLevel></span></p>
<p class="a6" style="BACKGROUND: #f2f2f2; MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 13.5pt; FTEL: 18.45pt"><span lang="EN-US"> <Discontinued>false</Discontinued></span></p>
<p class="a6" style="BACKGROUND: #f2f2f2; MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 13.5pt; FTEL: 18.45pt"><span lang="EN-US"> </products></span></p>
<p class="a6" style="BACKGROUND: #f2f2f2; MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 13.5pt; FTEL: 18.45pt"><span lang="EN-US"> </XMLProducts></span></p>
<p class="a6" style="BACKGROUND: #f2f2f2; MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 13.5pt; FTEL: 18.45pt"><span lang="EN-US"> <diffgr:before></span></p>
<p class="a6" style="BACKGROUND: #f2f2f2; MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> <products diffgr:id="products1" msdata:rowOrder="0"></span></p>
<p class="a6" style="BACKGROUND: #f2f2f2; MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> <ProductID>1</ProductID></span></p>
<p class="a6" style="BACKGROUND: #f2f2f2; MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> <ProductName>Chai</ProductName></span></p>
<p class="a6" style="BACKGROUND: #f2f2f2; MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> <SupplierID>1</SupplierID></span></p>
<p class="a6" style="BACKGROUND: #f2f2f2; MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> <CategoryID>1</CategoryID></span></p>
<p class="a6" style="BACKGROUND: #f2f2f2; MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> <QuantityPerUnit>10 boxes x 20 bags</QuantityPerUnit></span></p>
<p class="a6" style="BACKGROUND: #f2f2f2; MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> <UnitPrice>18</UnitPrice></span></p>
<p class="a6" style="BACKGROUND: #f2f2f2; MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> <UnitsInStock>39</UnitsInStock></span></p>
<p class="a6" style="BACKGROUND: #f2f2f2; MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> <UnitsOnOrder>0</UnitsOnOrder></span></p>
<p class="a6" style="BACKGROUND: #f2f2f2; MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> <ReorderLevel>10</ReorderLevel></span></p>
<p class="a6" style="BACKGROUND: #f2f2f2; MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> <Discontinued>false</Discontinued></span></p>
<p class="a6" style="BACKGROUND: #f2f2f2; MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> </products></span></p>
<p class="a6" style="BACKGROUND: #f2f2f2; MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> </diffgr:before></span></p>
<p class="a6" style="MARGIN-TOP: 0cm; BACKGROUND: #f2f2f2; MARGIN-LEFT: 21.45pt; MARGIN-RIGHT: 0cm; FTEL: 18.45pt"><span lang="EN-US"></diffgr:diffgram></span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">注意每个</span><span lang="EN-US">DataTable</span><span style="FONT-FAMILY: 宋体">行是如何重复的，每个</span><span lang="EN-US"><products></span><span style="FONT-FAMILY: 宋体">元素都有一个</span><span lang="EN-US">diffgr:id</span><span style="FONT-FAMILY: 宋体">属性</span><span lang="EN-US">(</span><span style="FONT-FAMILY: 宋体">为节省空间，只列出了第一个和最后一个</span><span lang="EN-US"><products></span><span style="FONT-FAMILY: 宋体">元素</span><span lang="EN-US">)</span><span style="FONT-FAMILY: 宋体">。</span><span lang="EN-US">Diffgr</span><span style="FONT-FAMILY: 宋体">是</span><span lang="EN-US">urn:schemas-microsoft-com:xml- diffgram-v1</span><span style="FONT-FAMILY: 宋体">的命名空间前缀。对于修改和插入的行，</span><span lang="EN-US">ADO.NET</span><span style="FONT-FAMILY: 宋体">增加了一个</span><span lang="EN-US">diffgr:hasChanges</span><span style="FONT-FAMILY: 宋体">属性。在</span><span lang="EN-US"><XMLProducts></span><span style="FONT-FAMILY: 宋体">元素的后面还有一个</span><span lang="EN-US">ffgr:before></span><span style="FONT-FAMILY: 宋体">元素，它包含一个</span><span lang="EN-US"><products></span><span style="FONT-FAMILY: 宋体">元素，表示被修改的行以前的内容。显然，插入的行没有任何“以前”的值，所以在</span><span lang="EN-US"><diffgr:before></span><span style="FONT-FAMILY: 宋体">中没有元素。</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">在把</span><span lang="EN-US">DiffGram</span><span style="FONT-FAMILY: 宋体">读入</span><span lang="EN-US">DataTable</span><span style="FONT-FAMILY: 宋体">后，它就处于数据被修改之后，但在调用</span><span lang="EN-US">AcceptChanges</span><span style="FONT-FAMILY: 宋体">之前的状态。此时可以通过调用</span><span lang="EN-US">RejectChanges</span><span style="FONT-FAMILY: 宋体">方法撤销所进行的修改。通过查看</span><span lang="EN-US">DataRow.Item</span><span style="FONT-FAMILY: 宋体">属性，以及它的参数</span><span lang="EN-US">DataRowVersion.Original </span><span style="FONT-FAMILY: 宋体">或</span><span lang="EN-US"> DataRowVersion.Current</span><span style="FONT-FAMILY: 宋体">，就可以确定</span><span lang="EN-US">DataTable</span><span style="FONT-FAMILY: 宋体">在修改前后的值。</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">如果有一系列的</span><span lang="EN-US">DiffGram</span><span style="FONT-FAMILY: 宋体">，能以合适的顺序重复应用它们是非常重要的。我们不想回退多次迭代所作的改变。但是如果使用的</span><span lang="EN-US">DBMS</span><span style="FONT-FAMILY: 宋体">没有提供这些功能，可以使用</span><span lang="EN-US">DiffGram</span><span style="FONT-FAMILY: 宋体">作为一种记录的格式，或用于审查。</span></p></div>
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<h1 id="divCurrentNode2" style="color: #b83507; width: 100%; text-align: left; font-size: 12px; padding-left: 2px">当前章节:<a href='100165651.htm'><font color='red'>23.8.3 读写DiffGram</font></a></h1>
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<div style='float:left;width:49%'>·<a href='100165648.htm'>23.8.1 将ADO.NET数据转换为XML文档(1)</a></div><div style='float:right;width:49%'>·<a href='100165649.htm'>23.8.1 将ADO.NET数据转换为XML文档(2)</a></div><div style='float:left;width:49%'>·<a href='100165650.htm'>23.8.2 把XML文档转换为 ADO.NET数据</a></div><div style='float:right;width:49%'>·<a href='100165652.htm'>23.9 在XML中串行化对象</a></div><div style='float:left;width:49%'>·<a href='100165653.htm'>23.10 小结</a></div><div style='float:right;width:49%'>·<a href='100165679.htm'>25.1 ASP.NET概述</a></div></div>
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