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See the JdbcFaq for non-SQL specific JDBC questions. Or ask in the JDBC forum. Also see SqlBestPractices.

Q. How do I batch statements to reduce roundtrips?

For inserts/updates, it is easy - JDBC provides an executeBatch() method. For select statements, it requires a bit of engineering. Batching Select Statements has a good discussion on the topic

Q. How do I insert if the record doesn't exist and update if it does?

The SQL merge statement does this "or" operation. If the row exists, it does an update. Otherwise it inserts a row.

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