Do ResultSets and Statements Automatically Close When the Connection is Closed?

Must JDBC ResultSets and Statements be Closed Explicitly Even When Connection is Shut Down?

It is considered good practice to meticulously close all JDBC resources upon completion of their usage. However, does closing the Connection alone suffice in ensuring the release of all resources, including ResultSets and Statements?

Answer:

The code snippet you have provided adheres to best practices. Explicitly closing ResultSets and Statements is essential for ensuring the proper release of database resources, even when the Connection is eventually closed.

Connection pooling, a common technique for optimizing database performance, can come into play here. If you rely on a "primitive" type of connection pooling, closing the Connection simply returns it to the pool without closing the ResultSet or Statement. This can lead to resource leaks and subsequent problems.

Therefore, it is crucial to consistently close ResultSets, Statements, and Connections explicitly, regardless of their perceived closure by closing the Connection alone. This ensures that all database resources are promptly released, preventing potential issues and maintaining optimal performance.

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