Interface CreditCardRepository

All Superinterfaces:
org.springframework.data.repository.CrudRepository<CreditCard, Long>, org.springframework.data.jpa.repository.JpaRepository<CreditCard, Long>, org.springframework.data.repository.ListCrudRepository<CreditCard, Long>, org.springframework.data.repository.ListPagingAndSortingRepository<CreditCard, Long>, org.springframework.data.repository.PagingAndSortingRepository<CreditCard, Long>, org.springframework.data.repository.query.QueryByExampleExecutor<CreditCard>, org.springframework.data.repository.Repository<CreditCard, Long>
@Repository public interface CreditCardRepository extends org.springframework.data.jpa.repository.JpaRepository<CreditCard, Long>
Spring Data JPA repository for CreditCard entities.

Provides standard CRUD operations inherited from JpaRepository and specialized query/deletion methods for payment method management.

Credit cards are sensitive data. Although the full card number is stored in this example (for simplicity), in production systems it is strongly recommended to:

  • Store only the last 4 digits + masked version
  • Use tokenization (e.g., Stripe, Adyen, bank vault)
  • Encrypt at rest and never log full card numbers

This repository is automatically implemented by Spring at runtime — no manual implementation needed.

Since:
1.0
See Also:

  • Method Summary

    Modifier and Type
    Method
    Description
    void
    deleteByCardNumber(String number)
    Deletes a credit card by its full card number.
    Optional<CreditCard>
    findByNumber(String number)
    Finds a credit card by its full card number.

    Methods inherited from interface org.springframework.data.repository.CrudRepository

    count, delete, deleteAll, deleteAll, deleteAllById, deleteById, existsById, findById, save

    Methods inherited from interface org.springframework.data.jpa.repository.JpaRepository

    deleteAllByIdInBatch, deleteAllInBatch, deleteAllInBatch, deleteInBatch, findAll, findAll, flush, getById, getOne, getReferenceById, saveAllAndFlush, saveAndFlush

    Methods inherited from interface org.springframework.data.repository.ListCrudRepository

    findAll, findAllById, saveAll

    Methods inherited from interface org.springframework.data.repository.ListPagingAndSortingRepository

    findAll

    Methods inherited from interface org.springframework.data.repository.PagingAndSortingRepository

    findAll

    Methods inherited from interface org.springframework.data.repository.query.QueryByExampleExecutor

    count, exists, findAll, findBy, findOne

  • Method Details

    • findByNumber

      Optional<CreditCard> findByNumber(String number)
      Finds a credit card by its full card number.

      Used primarily during:

      • Checkout when customer selects a previously saved card
      • Duplicate card detection before saving a new payment method
      • Admin or support tools looking up a card by number (with proper authorization)

      Security note: Full card numbers are PCI-sensitive data. Access to this method should be strictly limited and audited.

      Parameters:
      number - the full credit card number (digits only, no spaces/dashes)
      Returns:
      an Optional containing the matching CreditCard if found, or Optional.empty() if no card with this number exists

    • deleteByCardNumber

      void deleteByCardNumber(String number)
      Deletes a credit card by its full card number.

      Provides a convenient way to remove a saved payment method without first loading the entity. Useful in scenarios such as:

      • User explicitly removing a saved card from their account
      • Admin/support permanently deleting a compromised card
      • Scheduled cleanup of expired or flagged cards

      Security invalid input: '&' auditing: This is a destructive operation on sensitive data. Should be protected by proper authorization and logged for compliance.

      Parameters:
      number - the full card number of the card to delete