Where can I find a good pool manager? or ...

I need a pool manager or I must make it myself?
which is the different between DataSource and ConnectionPoolDataSource?
if I use ConnectionPoolDataSource to make database connection then if pool manager are needed?
if need ,how to make it?Where can I find the tutorials about it?

There are a few examples of pools on the web (as the previous reply quoted), and you could try www.javaworld.com/javaworld/jw-06-1998/jw-06-object-pool_p.html for a tuition.
The difference between DataSource and ConnectionPoolDataSource....hmm....they are both interfaces allowing providers (JDBC driver manufacturers, J2EE App Server manufacturers etc) to implement concrete classes that comply to certain method signatures.
Basically, uisng a Datasource will return a Connection, whereas a ConnectionPoolDataSource will return a PooledConnection, which in turn will return a Connection. However !!NOTE!! these classes DO NOT create a data pool on their own, and still require you to code your own pool (which is a bit misleading when you consider the names of the interfaces).
Hope that helps a little.

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