How to display items from database using catagorylookupdroplet

Hi everyone,
i want to know how to display items from database using catagorylookup droplet. if anybody have any code snippet please share it.
Thanks in advance,

<dsp:droplet name=".................../CategoryLookup">
     <dsp:param name="id" param="itemId"/>
     <dsp:oparam name="output">
          <dsp:valueof param="element.displayName"/>
               <%-- This is show the Child Category --%>
               <dsp:droplet name="......................./ForEach">
               <dsp:param name="array" param="element.childCategories"/>
               <dsp:oparam name="outputStart">Child Categories</dsp:oparam>
               <dsp:oparam name="output">
                    <dsp:a href="">//bydefault it will take its own file's name
                         <dsp:param name="itemId" param="element.repositoryId"/>                                                                                          <dsp:valueof param="element.displayName"/>
                    </dsp:a>
               </dsp:oparam>
               </dsp:droplet>
               <%-- This is show the Child Product --%>
               <dsp:droplet name=".............../ForEach">
                    <dsp:param name="array" param="element.childProducts"/>
                    <dsp:oparam name="outputStart">Child Products</dsp:oparam>
                              <dsp:oparam name="output">
                                   <dsp:droplet name="................/ProductLookup">
                                        <dsp:param name="id" param="itemId"/>
                                        <dsp:param name="elementName" value="Prod"/>
                                        <dsp:oparam name="output">
                                             <dsp:getvalueof id="img102" param="Prod.smallImage.url" idtype="java.lang.String">
                                                  <dsp:img height="250" width="250" src="<%=img102%>"/>
                                             </dsp:getvalueof>
                                        </dsp:oparam>
                                   </dsp:droplet>
                                   <dsp:a href="productView.jsp">
                                        <dsp:param name="itemId" param="element.repositoryId"/>
                                        <dsp:valueof param="element.displayName"/>
                                   </dsp:a>
Hope this helps.
-RMishra

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