orresponding to the entity
 that is the target of the update.
 A <code>CriteriaUpdate</code> object has a single root, the entity that
 is being updated.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>entityClass</code> - the entity class</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>query root corresponding to the given entity</dd>
</dl>
</li>
</ul>
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