Refactor: Implement JDBC and MySQL #11
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Drop serialization in favor of a MySQL database for data storage. Improve design: - Decouple classes. - Ensure single-responsibility principles.
Instead of using a Singleton pattern, ensure data consistency and prevent duplication of `allAnimals` by passing the same `AnimalService` instance between controllers. Additionally, ensure data is not loaded twice by setting a flag that must be checked before calling `loadFromDb()`. This maintains the benefits previously established by the Singleton while reducing complexity and improving testability.
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Drop serialization in favor of a MySQL database for data storage. Improve design: