Do I Need to Close ResultSet and Statement After Closing the Connection in JDBC?

Closing JDBC Resources: Is it Necessary with Closed Connections?

It is considered essential to close all JDBC resources after use to prevent resource leaks and potential system issues. However, a common question arises: if we close the connection, do we still need to close the ResultSet and Statement objects separately?

Answer:

Yes, it is necessary to close the ResultSet and Statement objects despite the closure of the Connection.

In the provided code snippet, the finally block demonstrates the best practice of closing JDBC resources in a specific order: ResultSet, Statement, and then Connection. This is crucial because:

• The JDBC specification does not guarantee that closing the Connection will automatically close the ResultSet and Statement. It is possible for a "primitive" type of database pooling to return the Connection to the pool without closing the ResultSet/Statement.
• Leaving ResultSet and Statement objects open can lead to resource leaks and other system-related issues, particularly in high-traffic environments.

Therefore, it is essential to establish a consistent practice of closing JDBC resources in the following order:

1. ResultSet
2. Statement
3. Connection

By following this best practice, you ensure the proper release of resources, prevent resource leaks, and minimize system-related issues in your JDBC applications.

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