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Explicitly closing Statements, ResultSets, and Connections
You should explicitly close Statements, ResultSets, and Connections when
you no longer need them.
Connections to Derby are
resources external to an application, and the garbage collector will not close
them automatically.
For example, close a Statement object using its close method;
close a Connection object using its close method.
If auto-commit is disabled, active transactions need to be explicitly committed
or rolled back before closing the connection
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