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<h1>OpenLink Virtuoso Universal Server: Documentation - key</h1>
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<h2>key</h2>
<div class="refpurpose">A key value of the vspx:form of type 'update'.</div>
<div class="funcsynopsis">
<span class="funcdef">
<<a href="vc_key.html">
<span class="function">key</span>
</a>
name (optional)
column (required)
value (required)
default (optional)
xsd-stub-xhtml (optional)
width (optional)
height (optional)
debug-srcfile (optional)
debug-srcline (optional)
debug-log (optional)
/></span>
</div>
<div class="refsect1">
<div class="refsect1title">Description</div>
<p>This control defines a key value of the vspx:form of type 'update'.
All the vspx:key children together should select one or zero rows from the table.
Controls inside the form will process fields of this selected row.
</p>
</div>
<div class="refsect1">
<div class="refsect1title">Attributes</div>
<div class="formalpara">
<strong>name = <a href="vc_type_SqlName.html">SqlName</a>
</strong>
<p>Not used</p>
</div>
<div class="formalpara">
<strong>column = <a href="vc_type_SqlName.html">SqlName</a>
</strong>
<p>Name of the column in the table to be updated.
This may be either the name of a primary key column or an other column, as long as the selection specified by all vspx:key children of the vspx:form is unambiguous.</p>
</div>
<div class="formalpara">
<strong>value = <a href="vc_type_CalculateableValue.html">CalculateableValue</a>
</strong>
<p>The value of the key field referred to by the 'column' attribute.</p>
</div>
<div class="formalpara">
<strong>default = <a href="vc_type_CalculateableValue.html">CalculateableValue</a>
</strong>
<p>The default value to be used when the 'value' expression returns NULL.</p>
</div>
<div class="formalpara">
<strong>xsd-stub-xhtml</strong>
<p>This attribute is for internal use only. It has no effect if added to the source VSPX file.</p>
</div>
<div class="formalpara">
<strong>width</strong>
<p>Visible width of the control when it is displayed in WYSIWYG tools when the source VSPX text is edited.
The value of this attribute will not be used when the resulting HTML is rendered.</p>
</div>
<div class="formalpara">
<strong>height</strong>
<p>Visible width of the control when it is displayed in WYSIWYG tools when the source VSPX text is edited.
The value of this attribute will not be used when the resulting HTML is rendered.</p>
</div>
<div class="formalpara">
<strong>debug-srcfile</strong>
<p>URI of the source document where the tag comes from.</p>
</div>
<div class="formalpara">
<strong>debug-srcline</strong>
<p>Line number in the source document where the tag comes from.</p>
</div>
<div class="formalpara">
<strong>debug-log</strong>
<p>This defines what sort of data are saved to the debugging log.
</p>
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