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The following must be considered when using the
ResultSet interface:
Before reading any values, you must call
next(). This returns true if there is a
result, but more importantly, it prepares the row for
processing.
You must close a ResultSet by calling
close() once you have finished using it.
Once you make another query with the
Statement used to create a
ResultSet, the currently open
ResultSet instance is closed
automatically.