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last updated: 10-Jan-2007
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<p>When Proxool gives you a Statement or a Connection then it gives you a proxy object that
delegates to the underlying (or delegate) driver. When it does so it automatically implements
any interfaces that it finds. For instance, imagine your Xyz driver supplies you with a Statement
<tt>XyzStatement</tt> that is actually an interface that extends the <tt>java.sql.Statement</tt>
interface. When you ask Proxool for a Statement then you can cast it into an <tt>XyzStatement</tt>
like this:
</p>
<pre>
Connection connection = DriverManager.getConnection(url);
XyzStatement xyzStatement = (XyzStatement) connection.createStatement();
</pre>
However, if <tt>XyzStatement</tt> is a class that implements <tt>java.sql.Statement</tt> then
we are unable to extend it because of the Java limitation of only having one superclass. There is
an alternative though: you have to write your own interface:
<pre>
package com.mycompany.jdbc;
public interface XyzStatementIF {
/**
* Whatever methods in XyzStatement we want access to
*/
void foo();
}
</pre>
Then, you <b>inject</b> that interface into the Proxool code by setting the appropriate
configuration property:
<pre>
injectable-statement-interface = com.mycompany.jdbc.XyzStatementIF
</pre>
You can do that for the following objects:
<ul>
<li><tt>java.sql.Connection</tt> using injectable-connection-interface</li>
<li><tt>java.sql.Statement</tt> using injectable-statement-interface</li>
<li><tt>java.sql.PreparedStatement</tt> using injectable-prepared-statement-interface</li>
<li><tt>java.sql.CallableStatement</tt> using injectable-callable-statement-interface</li>
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