This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
The JDBC interfaces are implemented by the driver implementation. How the driver satisfies the various functional requirements placed on it by these interfaces is vendor-specific, so its up to the driver writer to implement these.