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In particular, c3p0 provides several useful services: From a users' perspective, c3p0 simply provides standard jdbc Data Source objects.When creating these Data Sources, users can control pooling-related, naming-related, and other properties.

Driver" ); //loads the jdbc driver Jdbc Url( "jdbc:postgresql://localhost/testdb" ); User("swaldman"); Password("test-password"); // the settings below are optional -- c3p0 can work with defaults Min Pool Size(5); Acquire Increment(5); Max Pool Size(20); // The Data Source cpds is now a fully configured and usable pooled Data Source ...

"); c3p0 maintains separate pools for Connections with distinct authentications.

The various methods let you query the status of pools individually, or aggregate statistics for all authentifications for which your Data Source is maintaining pools.

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Note that pool configuration parmeters such as The first method will hand you the Set of all live c3p0 Pooled Data Sources.

If you are sure your application only makes one Pooled Data Sources, or you can distinguish between the Data Sources by their configuration properties (inspected via "getters"), the first method may be sufficient.If you wish to use a named configuration, construct your Data Source ds_unpooled = Data Sources.unpooled Data Source("jdbc:postgresql://localhost/testdb", "swaldman", "test-password"); Data Source ds_pooled = Data Sources.pooled Data Source( ds_unpooled ); // The Data Source ds_pooled is now a fully configured and usable pooled Data Source. Data Source ds_unpooled = Data Sources.unpooled Data Source("jdbc:postgresql://localhost/testdb", "swaldman", "test-password"); Map overrides = new Hash Map(); overrides.put("max Statements", "200"); //Stringified property values work overrides.put("max Pool Size", new Integer(50)); //"boxed primitives" also work // create the Pooled Data Source using the default configuration and our overrides ds_pooled = Data Sources.pooled Data Source( ds_unpooled, overrides ); // The Data Source ds_pooled is now a fully configured and usable pooled Data Source, // with Statement caching enabled for a maximum of up to 200 statements and a maximum // of 50 Connections. // create the Pooled Data Source using the a named configuration and specified overrides // "intergalacto App" is a named configuration ds_pooled = Data Sources.pooled Data Source( ds_unpooled, "intergalacto App", overrides ); Data Source ds_unpooled = Data Sources.unpooled Data Source("jdbc:postgresql://localhost/testdb", "swaldman", "test-password"); Pool Config pc = new Pool Config(); Max Statements(200); //turn on Statement pooling // pass our overriding Pool Config to the Data Sources.pooled Data Source() factory method.// The Data Source is using a default pool configuration, and Postgres' JDBC driver // is presumed to have already been loaded via the jdbc.drivers system property or an // explicit call to Name("org.postgresql. ds_pooled = Data Sources.pooled Data Source( ds_unpooled, pc ); // The Data Source ds_pooled is now a fully configured and usable pooled Data Source, // with Statement caching enabled for a maximum of up to 200 statements. property, but not a password property, or you have access to a Data Source that you wish to wrap behind a pool, but you wish to override its build-in authentification defaults without actually modifying the // fetch a JNDI-bound Data Source Initial Context ictx = new Initial Context(); Data Source ds = (Data Source) ictx.lookup( "java:comp/env/jdbc/my Data Source" ); // make sure it's a c3p0 Pooled Data Source if ( ds instanceof Pooled Data Source) else println("Not a c3p0 Pooled Data Source!When you are done, you can clean up the Data Source you've created like this: c3p0 is an easy-to-use library for making traditional JDBC drivers "enterprise-ready" by augmenting them with functionality defined by the jdbc3 spec and the optional extensions to jdbc2.As of version 0.9.5, c3p0 fully supports the jdbc4 spec.C3P0 wraps these Objects behind a proxies, so you cannot cast C3P0-returned Connections or Statements to the vendor-specific implementation classes.