How it works
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The latest version of Proxool is 0.9.1
You can donate to Proxool in the usual way:

Proxool acts as a proxy. That is, when you ask it to do something it delegates that task to another JDBC driver (you can use whatever driver you like). This has an important benefit: you can switch from any JDBC driver to Proxool by simply making a few configuration changes. The standard life cycle of asking the DriverManager for a Connection and then closing that Connection when you have finished with it remains unchanged.

connection = DriverManager.getConnection(url);

When the ProxoolDriver gives you a Connection it actually gives you a ProxyConnection instead. The ProxyConnection does everything that a Connection does except that when you call the close() method it doesn't really close. Instead, it puts itself back into the pool.