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21.1.2 共享类
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21.1.2 共享类
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<link href="css.css" rel="stylesheet" type="text/css" /><h3 style="MARGIN-TOP: 8.15pt; MARGIN-LEFT: 0cm; MARGIN-RIGHT: 0cm; FTEL: 8.15pt"><span lang="EN-US">21.1.2 </span><span style="FONT-FAMILY: 黑体">共享类</span></h3>
<p class="MsoNormal" style="LINE-HEIGHT: 17pt"><a ftel="classes"><span lang="EN-US" style="LETTER-SPACING: -0.1pt">ADO.NET</span></a><span style="FONT-FAMILY: 宋体; LETTER-SPACING: -0.1pt">包含许多类，无论是使用</span><span lang="EN-US" style="LETTER-SPACING: -0.1pt">SQL Server</span><span style="FONT-FAMILY: 宋体; LETTER-SPACING: -0.1pt">类，还是使用</span><span lang="EN-US" style="LETTER-SPACING: -0.1pt">OLE DB</span><span style="FONT-FAMILY: 宋体; LETTER-SPACING: -0.1pt">类，都可以使用它们。</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">下面的类包含在</span><span lang="EN-US">System.Data</span><span style="FONT-FAMILY: 宋体">命名空间中：</span></p>
<p class="1" style="MARGIN-LEFT: 37.55pt; FTEL: -16.1pt"><span lang="EN-GB">●<span style="FONT: 7pt 'Times New Roman'"> </span></span><span lang="EN-US">DataSet</span><span style="FONT-FAMILY: 宋体; LETTER-SPACING: -1pt">——</span><span style="LETTER-SPACING: -1pt"> </span><span style="FONT-FAMILY: 宋体">这个对象主要用于断开连接，它包含一组</span><span lang="EN-US">DataTable</span><span style="FONT-FAMILY: 宋体">，以及这些表之间的</span><span lang="EN-GB"> </span><span style="FONT-FAMILY: 宋体">关系。</span></p>
<p class="1" style="MARGIN-LEFT: 37.55pt; FTEL: -16.1pt"><span lang="EN-GB">●<span style="FONT: 7pt 'Times New Roman'"> </span></span><span lang="EN-US">DataTable</span><span style="FONT-FAMILY: 宋体; LETTER-SPACING: -1pt">——</span><span style="LETTER-SPACING: -1pt"> </span><span style="FONT-FAMILY: 宋体">数据的一个容器，</span> <span lang="EN-US">DataTable</span><span style="FONT-FAMILY: 宋体">由一个或多个</span><span lang="EN-US">DataColumn</span><span style="FONT-FAMILY: 宋体">组成</span><span style="FONT-FAMILY: 宋体">，</span><span style="FONT-FAMILY: 宋体">每个</span><span lang="EN-US">DataColumn</span><span style="FONT-FAMILY: 宋体">由一个或多个包含数据的</span> <span lang="EN-US">DataRow</span><span style="FONT-FAMILY: 宋体">生成。</span></p>
<p class="1" style="MARGIN-LEFT: 37.55pt; FTEL: -16.1pt"><span lang="EN-GB">●<span style="FONT: 7pt 'Times New Roman'"> </span></span><span lang="EN-US">DataRow</span><span style="FONT-FAMILY: 宋体; LETTER-SPACING: -1pt">——</span><span style="LETTER-SPACING: -1pt"> </span><span style="FONT-FAMILY: 宋体">许多数值，类似于数据库表的一行，或电子数据表中的一行。</span></p>
<p class="1" style="MARGIN-LEFT: 37.55pt; FTEL: -16.1pt"><span lang="EN-GB">●<span style="FONT: 7pt 'Times New Roman'"> </span></span><span lang="EN-US">DataColumn</span><span style="FONT-FAMILY: 宋体; LETTER-SPACING: -1pt">——</span><span style="LETTER-SPACING: -1pt"> </span><span style="FONT-FAMILY: 宋体">包含列的定义，例如名称和数据类型。</span></p>
<p class="1" style="MARGIN-LEFT: 37.55pt; FTEL: -16.1pt"><span lang="EN-GB">●<span style="FONT: 7pt 'Times New Roman'"> </span></span><span lang="EN-US">DataRelation</span><span style="FONT-FAMILY: 宋体; LETTER-SPACING: -1pt">——</span><span style="LETTER-SPACING: -1pt"> </span><span lang="EN-US">DataSet</span><span lang="EN-US"> </span><span style="FONT-FAMILY: 宋体">中两个</span><span lang="EN-US">DataTable</span><span style="FONT-FAMILY: 宋体">之间的链接</span><span style="FONT-FAMILY: 宋体">，</span><span style="FONT-FAMILY: 宋体">用于外键码和主</span><span lang="EN-US">/</span><span style="FONT-FAMILY: 宋体">从关系。</span></p>
<p class="1" style="MARGIN-LEFT: 37.55pt; FTEL: -16.1pt"><span lang="EN-GB">●<span style="FONT: 7pt 'Times New Roman'"> </span></span><span lang="EN-US">Constraint</span><span style="FONT-FAMILY: 宋体; LETTER-SPACING: -1pt">——</span><span style="LETTER-SPACING: -1pt"> </span><span style="FONT-FAMILY: 宋体">为</span><span lang="EN-US">DataColumn</span><span lang="EN-US"> </span><span lang="EN-GB">(</span><span style="FONT-FAMILY: 宋体">或一组数据列</span><span lang="EN-GB">)</span><span style="FONT-FAMILY: 宋体">定义规则，例如惟一值。</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">下面两个类包含在</span><span lang="EN-US">System.Data.Common</span><span style="FONT-FAMILY: 宋体">命名空间中</span><span style="FONT-FAMILY: 宋体">：</span></p>
<p class="1" style="MARGIN-LEFT: 37.55pt; FTEL: -16.1pt"><span lang="EN-GB">●<span style="FONT: 7pt 'Times New Roman'"> </span></span><span lang="EN-US">DataColumnMapping</span><span style="FONT-FAMILY: 宋体; LETTER-SPACING: -1pt">——</span><span style="LETTER-SPACING: -1pt"> </span><span style="FONT-FAMILY: 宋体">用</span><span lang="EN-US">DataTable</span><span lang="EN-US"> </span><span style="FONT-FAMILY: 宋体">中的列名映射数据库中的列名。</span></p>
<p class="1" style="MARGIN-LEFT: 37.55pt; FTEL: -16.1pt"><span lang="EN-GB">●<span style="FONT: 7pt 'Times New Roman'"> </span></span><span lang="EN-US">DataTableMapping</span><span style="FONT-FAMILY: 宋体; LETTER-SPACING: -1pt">——</span><span style="LETTER-SPACING: -1pt"> </span><span style="FONT-FAMILY: 宋体">将数据库中的表名映射到</span><span lang="EN-GB">DateSet</span><span style="FONT-FAMILY: 宋体">中的</span><span lang="EN-GB">DataTable</span><span style="FONT-FAMILY: 宋体">中。</span></p></div>
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