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<title>DeleteRule 属性</title>
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<h2><a name="adprodeleterule"></a>DeleteRule 属性</h2>
<p>
指示主关键字被删除时将执行的操作。</p>
<p class=label>
<b>设置和返回值</b></p>
<p>
设置并返回长整型值,该值为如下常量之一:</p>
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<td class=label width=42%><b>常量</b></td>
<td class=label width=58%><b>说明</b></td>
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<td width=42%><b>adRINone</b></td>
<td width=58%>无操作。</td>
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<td width=42%><b>AdRICascade</b></td>
<td width=58%>层叠更改。</td>
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<td width=42%><b>AdRISetNull</b></td>
<td width=58%>将外部关键字值设置为 null。</td>
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<td width=42%><b>adRISetDefault</b></td>
<td width=58%>将外部关键字值设置为默认值。</td>
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<b>说明</b></p>
<p>
默认值是 <b>adRINone</b>。</p>
<p>
该属性在已追加到集合中的 <a href="adobjkey.htm">Key</a> 对象上是只读的。</p>
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