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<p>
This document describes how to invoke Proxool. It assumes that you're
familiar with the Java language in general and the JDBC API in particular.
Please visit Sun's <a href="http://java.sun.com/products/jdbc/">JDBC</a>
web site for information about JDBC.
</p>
<p><b>1.</b> If you adapting an existing application then the most transparent
way to switch to Proxool is to simply change the URL you use to connect to the
database. For example:</p>
<div class="codeSample">
<span class="lineNumber"> 1.</span>Connection connection = null;<br/>
<span class="lineNumber"> 2.</span>try {<br/>
<span class="lineNumber"> 3.</span> Class.forName("org.hsqldb.jdbcDriver");<br/>
<span class="lineNumber"> 4.</span> try {<br/>
<span class="lineNumber"> 5.</span> connection = DriverManager.getConnection("jdbc:hsqldb:test");<br/>
<span class="lineNumber"> 6.</span> } catch (SQLException e) {<br/>
<span class="lineNumber"> 7.</span> LOG.error("Problem getting connection", e);<br/>
<span class="lineNumber"> 8.</span> }<br/>
<span class="lineNumber"> 9.</span> <br/>
<span class="lineNumber">10.</span> if (connection != null) {<br/>
<span class="lineNumber">11.</span> LOG.info("Got connection :)");<br/>
<span class="lineNumber">12.</span> } else {<br/>
<span class="lineNumber">13.</span> LOG.error("Didn't get connection, which probably means that no Driver accepted the URL");<br/>
<span class="lineNumber">14.</span> }<br/>
<span class="lineNumber">15.</span> <br/>
<span class="lineNumber">16.</span>} catch (ClassNotFoundException e) {<br/>
<span class="lineNumber">17.</span> LOG.error("Couldn't find driver", e);<br/>
<span class="lineNumber">18.</span>} finally {<br/>
<span class="lineNumber">19.</span> try {<br/>
<span class="lineNumber">20.</span> // Check to see we actually got a connection before we<br/>
<span class="lineNumber">21.</span> // attempt to close it.<br/>
<span class="lineNumber">22.</span> if (connection != null) {<br/>
<span class="lineNumber">23.</span> connection.close();<br/>
<span class="lineNumber">24.</span> }<br/>
<span class="lineNumber">25.</span> } catch (SQLException e) {<br/>
<span class="lineNumber">26.</span> LOG.error("Problem closing connection", e);<br/>
<span class="lineNumber">27.</span> }<br/>
<span class="lineNumber">28.</span>}
</div>
<p>To start using Proxool, simply edit lines 3 and 5 (marked in blue):</p>
<div class="codeSample">
<span class="lineNumber"> 1.</span>Connection connection = null;<br/>
<span class="lineNumber"> 2.</span>try {<br/>
<span class="lineNumber"> 3.</span> Class.forName("<font color="#000099">org.logicalcobwebs.proxool.ProxoolDriver</font>");<br/>
<span class="lineNumber"> 4.</span> try {<br/>
<span class="lineNumber"> 5.</span> connection = DriverManager.getConnection("<font color="#000099">proxool.example:org.hsqldb.jdbcDriver:jdbc:hsqldb:test</font>");<br/>
<span class="lineNumber"> 6.</span> } catch (SQLException e) {<br/>
<span class="lineNumber"> 7.</span> LOG.error("Problem getting connection", e);<br/>
<span class="lineNumber"> 8.</span> }<br/>
<span class="lineNumber"> 9.</span> <br/>
<span class="lineNumber">10.</span> if (connection != null) {<br/>
<span class="lineNumber">11.</span> LOG.info("Got connection :)");<br/>
<span class="lineNumber">12.</span> } else {<br/>
<span class="lineNumber">13.</span> LOG.error("Didn't get connection, which probably means that no Driver accepted the URL");<br/>
<span class="lineNumber">14.</span> }<br/>
<span class="lineNumber">15.</span> <br/>
<span class="lineNumber">16.</span>} catch (ClassNotFoundException e) {<br/>
<span class="lineNumber">17.</span> LOG.error("Couldn't find driver", e);<br/>
<span class="lineNumber">18.</span>} finally {<br/>
<span class="lineNumber">19.</span> try {<br/>
<span class="lineNumber">20.</span> // Check to see we actually got a connection before we<br/>
<span class="lineNumber">21.</span> // attempt to close it.<br/>
<span class="lineNumber">22.</span> if (connection != null) {<br/>
<span class="lineNumber">23.</span> connection.close();<br/>
<span class="lineNumber">24.</span> }<br/>
<span class="lineNumber">25.</span> } catch (SQLException e) {<br/>
<span class="lineNumber">26.</span> LOG.error("Problem closing connection", e);<br/>
<span class="lineNumber">27.</span> }<br/>
<span class="lineNumber">28.</span>}
</div>
<p>The first change (line 3) just loads the Proxool JDBC driver (you only have to do this once). The second line
is the one that is interesting, The URL can be broken down into four sections:</p>
<p>proxool.<font color="#990000">example</font>:<font color="#009900">org.hsqldb.jdbcDriver</font>:<font color="#000099">jdbc:hsqldb:test</font></p>
<p style="margin-left: 16px">"<font color="#990000">example</font>" is the alias for this pool. This is a unique label that we will use to
reference the pool.</p>
<p style="margin-left: 16px">"<font color="#009900">org.hsqldb.jdbcDriver</font>" is the JDBC driver Proxool should
use to connect to the database. (The same one you were originally using).</p>
<p style="margin-left: 16px">"<font color="#000099">jdbc:hsqldb:test</font>" is the URL Proxool should
use to connect to the database. (The same one you were originally using).</p>
<p><b>2.</b> You will find it a lot easier if you explicitly configure the pools at startup, however. There
are lots of ways of doing this - see <a href="configure.html">here</a>. Once you've done that, it's just
a matter of using the alias to pick up a connection. For example:</p>
<div class="codeSample">
<span class="lineNumber"> 1.</span>Connection connection = null;<br/>
<span class="lineNumber"> 2.</span>try {<br/>
<span class="lineNumber"> 4.</span> try {<br/>
<span class="lineNumber"> 5.</span> connection = DriverManager.getConnection("<font color="#000099">proxool.example</font>");<br/>
<span class="lineNumber"> 6.</span> } catch (SQLException e) {<br/>
<span class="lineNumber"> 7.</span> LOG.error("Problem getting connection", e);<br/>
<span class="lineNumber"> 8.</span> }<br/>
<span class="lineNumber"> ...
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