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21.5 管理数据和关系：DataSet类
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C#高级编程（第3版）
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21.5 管理数据和关系：DataSet类
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2006-10-13 14:41:00
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<div style='float:left;width:49%'>·<a href='100165600.htm'>21.3.1 执行命令</a></div><div style='float:right;width:49%'>·<a href='100165601.htm'>21.3.2 调用存储过程</a></div><div style='float:left;width:49%'>·<a href='100165602.htm'>21.4 快速数据访问：数据读取器</a></div><div style='float:right;width:49%'>·<a href='100165604.htm'>21.5.1 数据表</a></div><div style='float:left;width:49%'>·<a href='100165605.htm'>21.5.2 数据列</a></div><div style='float:right;width:49%'>·<a href='100165606.htm'>21.5.3 数据关系</a></div></div>
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<link href="css.css" rel="stylesheet" type="text/css" /><h3 style="MARGIN-TOP: 11.4pt; MARGIN-LEFT: 0cm; MARGIN-RIGHT: 0cm; FTEL: 11.4pt"><a ftel="_Toc507815164"><span lang="EN-GB">21.5 </span></a><span style="FONT-FAMILY: 楷体_GB2312">管理数据和关系：</span><span lang="EN-US">DataSet</span><span style="FONT-FAMILY: 楷体_GB2312">类</span></h3>
<p class="MsoNormal" style="LINE-HEIGHT: 18pt"><span lang="EN-US" style="BACKGROUND: aqua"><a ftel="datasets"></a></span><span lang="EN-US" style="BACKGROUND: aqua"><a ftel="DataSet1"></a></span><span lang="EN-US">DataSet</span><span style="FONT-FAMILY: 宋体">类是数据的脱机容器。它不包含数据库连接的概念，实际上存储在</span><span lang="EN-US">DataSet</span><span style="FONT-FAMILY: 宋体">中的数据不一定来源于数据库，它可以是</span><span lang="EN-US">CSV</span><span style="FONT-FAMILY: 宋体">文件中的记录，或是来自测量设备中的点读取。</span></p>
<p class="MsoNormal" style="LINE-HEIGHT: 18pt"><span style="FONT-FAMILY: 宋体">数据集由一组数据表组成，每个表都有一些数据列和数据行。除了定义数据外，还可以在</span><span lang="EN-US">DataSet</span><span style="FONT-FAMILY: 宋体">中定义表之间的链接。例如，我们常常要定义父</span><span lang="EN-US">/</span><span style="FONT-FAMILY: 宋体">子关系</span><span lang="EN-US">(</span><span style="FONT-FAMILY: 宋体">通常也称为主</span><span lang="EN-US">/</span><span style="FONT-FAMILY: 宋体">从关系</span><span lang="EN-US">)</span><span style="FONT-FAMILY: 宋体">。表中的一个记录</span><span lang="EN-US">(</span><span style="FONT-FAMILY: 宋体">即</span><span lang="EN-US">Order)</span><span style="FONT-FAMILY: 宋体">链接到另一个表的许多记录上</span><span lang="EN-US">(</span><span style="FONT-FAMILY: 宋体">即</span><span lang="EN-US">Order</span><span lang="EN-US" style="FONT-FAMILY: 'Baskerville BE Regular'">_</span><span lang="EN-US">Details)</span><span style="FONT-FAMILY: 宋体">，这种关系可以在</span><span lang="EN-US">DataSet</span><span style="FONT-FAMILY: 宋体">中定义和导航，如图</span><span lang="EN-US">21-4</span><span style="FONT-FAMILY: 宋体">所示。</span></p>
<p align="center"><span lang="EN-US"><img height="205" src="21/image004.gif" width="424" alt="" /></span></p>
<p style="FTEL: 8.15pt" align="center"><span style="FONT-FAMILY: 宋体">图</span><span lang="EN-US"> 21-4</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">下一节描述和</span><span lang="EN-US">DataSet</span><span style="FONT-FAMILY: 宋体">一起使用的类。</span></p></div>
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<div style='float:left;width:49%'>·<a href='100165600.htm'>21.3.1 执行命令</a></div><div style='float:right;width:49%'>·<a href='100165601.htm'>21.3.2 调用存储过程</a></div><div style='float:left;width:49%'>·<a href='100165602.htm'>21.4 快速数据访问：数据读取器</a></div><div style='float:right;width:49%'>·<a href='100165604.htm'>21.5.1 数据表</a></div><div style='float:left;width:49%'>·<a href='100165605.htm'>21.5.2 数据列</a></div><div style='float:right;width:49%'>·<a href='100165606.htm'>21.5.3 数据关系</a></div></div>
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