2011-09-13 17:44:24 +00:00
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<title>Chapter 2. Transactional Application</title>
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<link rel="start" href="index.html" title="Getting Started with Replicated Berkeley DB Applications" />
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<link rel="prev" href="permmessages.html" title="Permanent Message Handling" />
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<body>
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<div class="libver">
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2012-11-14 21:35:20 +00:00
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<p>Library Version 11.2.5.3</p>
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2011-09-13 17:44:24 +00:00
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</div>
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<table width="100%" summary="Navigation header">
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<tr>
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<th colspan="3" align="center">Chapter 2. Transactional Application</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="permmessages.html">Prev</a> </td>
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<th width="60%" align="center"> </th>
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<td width="20%" align="right"> <a accesskey="n" href="simpleprogramlisting.html">Next</a></td>
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<hr />
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</div>
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<div class="chapter" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h2 class="title"><a id="txnapp"></a>Chapter 2. Transactional Application</h2>
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</div>
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</div>
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</div>
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<div class="toc">
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<p>
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<b>Table of Contents</b>
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</p>
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<dl>
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<dt>
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<span class="sect1">
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<a href="txnapp.html#appoverview">Application Overview</a>
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</span>
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</dt>
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<dt>
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<span class="sect1">
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<a href="simpleprogramlisting.html">Program Listing</a>
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</span>
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</dt>
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<dd>
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<dl>
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<dt>
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<span class="sect2">
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<a href="simpleprogramlisting.html#main_c">Function: main()</a>
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</span>
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</dt>
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<dt>
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<span class="sect2">
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<a href="simpleprogramlisting.html#create_env_c">Function: create_env()</a>
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</span>
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</dt>
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<dt>
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<span class="sect2">
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<a href="simpleprogramlisting.html#env_init_c">Function: env_init()</a>
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</span>
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</dt>
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<dt>
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<span class="sect2">
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<a href="simpleprogramlisting.html#doloop_c">Function: doloop()</a>
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</span>
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</dt>
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<dt>
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<span class="sect2">
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<a href="simpleprogramlisting.html#printstocks_c">
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<span>Function: print_stocks()</span>
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</a>
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</span>
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</dt>
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</dl>
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</dd>
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</dl>
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</div>
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<p>
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In this chapter, we build a simple transaction-protected DB
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application. Throughout the remainder of this book, we will add
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replication to this example. We do this to underscore the concepts
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that we are presenting in this book; the first being that you
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should start with a working transactional program and then add
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replication to it.
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</p>
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<p>
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Note that this book assumes you already know how to write a
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transaction-protected DB application, so we will not be
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covering those concepts in this book. To learn how to write a
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transaction-protected application, see the
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<em class="citetitle">Berkeley DB Getting Started with Transaction Processing</em> guide.
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</p>
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<div class="sect1" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h2 class="title" style="clear: both"><a id="appoverview"></a>Application Overview</h2>
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</div>
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</div>
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</div>
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<p>
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Our application maintains a stock market quotes database.
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This database contains records whose key is the stock
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market symbol and whose data is the stock's price.
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</p>
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<p>
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The application operates by presenting you with a command
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line prompt. You then enter the stock symbol and its value,
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separated by a space. The application takes this
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information and writes it to the database.
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</p>
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<p>
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To see the contents of the database, simply press
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<code class="literal">return</code> at the command prompt.
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</p>
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<p>
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To quit the application, type 'quit' or 'exit' at the
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command prompt.
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</p>
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<p>
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For example, the following illustrates the application's
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usage. In it, we use entirely fictitious stock market
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symbols and price values.
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</p>
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<pre class="programlisting">> ./ex_rep_gsg_simple -h env_home_dir
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QUOTESERVER> stock1 88
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QUOTESERVER> stock2 .08
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QUOTESERVER>
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Symbol Price
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====== =====
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stock1 88
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stock2 .08
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QUOTESERVER> stock1 88.9
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QUOTESERVER>
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Symbol Price
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====== =====
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stock1 88.9
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stock2 .08
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QUOTESERVER> quit
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></pre>
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</div>
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</div>
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<div class="navfooter">
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<hr />
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<tr>
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<td width="40%" align="left"><a accesskey="p" href="permmessages.html">Prev</a> </td>
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<td width="20%" align="center"> </td>
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<td width="40%" align="right"> <a accesskey="n" href="simpleprogramlisting.html">Next</a></td>
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</tr>
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<tr>
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<td width="40%" align="left" valign="top">Permanent Message Handling </td>
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<td width="20%" align="center">
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<a accesskey="h" href="index.html">Home</a>
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