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<h2 class="title"><a id="txnapp"></a>Chapter 2. Transactional Application</h2>
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<b>Table of Contents</b>
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<p>
In this chapter, we build a simple transaction-protected DB
application. Throughout the remainder of this book, we will add
replication to this example. We do this to underscore the concepts
that we are presenting in this book; the first being that you
should start with a working transactional program and then add
replication to it.
</p>
<p>
Note that this book assumes you already know how to write a
transaction-protected DB application, so we will not be
covering those concepts in this book. To learn how to write a
transaction-protected application, see the
<em class="citetitle">Berkeley DB Getting Started with Transaction Processing</em> guide.
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<p>
Our application maintains a stock market quotes database.
This database contains records whose key is the stock
market symbol and whose data is the stock's price.
</p>
<p>
The application operates by presenting you with a command
line prompt. You then enter the stock symbol and its value,
separated by a space. The application takes this
information and writes it to the database.
</p>
<p>
To see the contents of the database, simply press
<code class="literal">return</code> at the command prompt.
</p>
<p>
To quit the application, type 'quit' or 'exit' at the
command prompt.
</p>
<p>
For example, the following illustrates the application's
usage. In it, we use entirely fictitious stock market
symbols and price values.
</p>
<pre class="programlisting">> ./ex_rep_gsg_simple -h env_home_dir
QUOTESERVER> stock1 88
QUOTESERVER> stock2 .08
QUOTESERVER>
Symbol Price
====== =====
stock1 88
stock2 .08
QUOTESERVER> stock1 88.9
QUOTESERVER>
Symbol Price
====== =====
stock1 88.9
stock2 .08
QUOTESERVER> quit
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