r <a class="link" href="ElementHolder.html" title="Chapter 23.  ElementHolder">ElementHolder</a>
 wrapper types for float/double types. These operators not only modifies the cached data element, but also stores new value to database if it associates a database key/data pair. </p>
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              <h3 class="title"><a id="idp51509056"></a>Class</h3>
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