Foreign Key Mapping pattern

Description:
The Foreign Key Mapping design pattern is used to maintain relationships between tables in a relational database by using foreign keys. This pattern helps in establishing and enforcing referential integrity between related entities. The implementation of this pattern typically involves:

1. Adding foreign key columns in the child table that reference primary keys in the parent table.
2. Ensuring the foreign key constraints are properly defined and maintained.
3. Managing the relationships and ensuring the consistency of data through CRUD operations.

This pattern is essential for ensuring data integrity and facilitating efficient data retrieval in relational database systems.

References:

• Martin Fowler: Foreign Key Mapping
• Source Code Examples: Foreign Key Mapping Pattern

Acceptance Criteria:

1. A new implementation of the Foreign Key Mapping pattern is added to the project, including appropriate classes and database schema.
2. Unit tests are written to cover all CRUD operations, ensuring that referential integrity is maintained.
3. Documentation is updated to explain the Foreign Key Mapping pattern, including code examples and usage guidelines.

No project files, tests, or entry points are named. Start by reviewing the repository's existing Java pattern structure and the linked pull request #1723, then use the referenced Foreign Key Mapping material for context. Done means an implementation, CRUD and referential-integrity tests, and updated documentation with examples and usage guidance.