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<TITLE>Writing Advanced Applications, Chapter 2: Container-Managed
finder Methods</TITLE>
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<H2>Writing Advanced Applications<BR>
<FONT SIZE="3">Chapter 2 Continued: Container-Managed finder Methods</FONT></H2>
<FONT SIZE="-1">[<A HREF="code4.html"><<BACK</A>] [<A HREF="index.html#contents">CONTENTS</A>] [<A HREF="bmp.html">NEXT>></A>]</FONT></DIV>
<P>
The auction house search facility is implemented as a container-managed
<CODE>finder</CODE>. method. It starts when
the end user types in a search string and clicks the <CODE>Submit</CODE>
button on the home page to locate an auction item. As shown in the diagram,
the browser passes the search string to the <CODE>AuctionServlet.searchItem</CODE>
method, which then passes it to the <CODE>BidderBean.getMatchingItemsList</CODE> method.
<P>
At this point,
<CODE>BidderBean.getMatchingItemsList</CODE> passes
the search string to the <CODE>findAllMatchingItems</CODE>
method declared in the <CODE>AuctionItemHome</CODE> interface.
This method is a <CODE>finder</CODE> method, and container implementations
vary in how they handle calls to <CODE>finder</CODE> methods.
<A HREF="http://weblogic.beasys.com/index.htm">BEA Weblogic</A>
containers look in the Bean's deployment descriptor for information
on a Bean's <CODE>finder</CODE> methods.
<P>
In the case of the search, the deployment descriptor maps the search string
passed to <CODE>AuctionItemHome.findAllMatchingItems</CODE>
to the <CODE>summary</CODE> field in the underlying
<CODE>AuctionItems</CODE> database table.
This tells the Enterprise JavaBeans<FONT SIZE="-2"><SUP>TM</SUP></FONT> server to retrieve data for all
auction items with a <CODE>summary</CODE> field that contains text
that matches the search string.
<P>
<CENTER>
<IMG SRC="./Art/search.gif">
</CENTER>
<P>
This section walks through the different parts of the
<CODE>finder</CODE>-based search code. Chapter 3 describes how
to create a Bean-managed search to handle complex
queries and searches that span more than one Bean type (entity and
session Beans) or database tables.
<UL>
<LI><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<A HREF="#si">AuctionServlet.searchItems</A></FONT>
<LI><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<A HREF="#gmi">BidderBean.getMatchingItemsList</A></FONT>
<LI><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<A HREF="#fmi">AuctionItemHome.findAllMatchingItems</A></FONT>
<LI><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<A HREF="#dd">AuctionItemBean Deployment Descriptor</A></FONT>
</UL>
<HR>
<A NAME="si"></A>
<H3>AuctionServlet.searchItems</H3>
The <CODE>searchItems</CODE> method retrieves the text
string from the browser, creates an
<CODE>HTML</CODE> page to display the search results,
and passes the search string to the
<CODE>BidderBean.getMatchingItemsList</CODE> method.
<CODE>BidderBean</CODE> is a session Bean that retrieves
lists of auction items and checks the user ID and
password for end users seeking to bid on auction items.
<P>
The search results are returned to this method
in an <CODE>Enumeration</CODE> variable.
</FONT>
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