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🔔 Subscribe NowWhat is the Table Module Design Pattern?
The Table Module Pattern is an enterprise domain logic pattern from Martin Fowler’s Patterns of Enterprise Application Architecture (PofEAA).
In simple terms: A Table Module organizes domain logic with one class per database table or view, where a single instance of that class contains all the procedures and business rules that act on the table's data.
Real-World Example: Hotel Room Reservation System
Consider a database schema for booking hotel rooms with three primary tables:
- Hotel Table: Stores hotel records (e.g.,
hotel_id,hotel_name). - Room Table: Stores room records (e.g.,
room_id,room_number,number_of_beds). - Booking Table: Stores booking records (e.g.,
booking_id,hotel_id,room_id,is_booked).
Under the Table Module pattern, you define one dedicated module class for each database table:
- Hotel Module Class: Handles all queries, updates, insertions, and business logic for all rows in the Hotel table.
- Room Module Class: Handles room availability checks, updates, and modifications across the entire Room table.
- Booking Module Class: Encapsulates booking reservations, room assignment checks, and cancellations across the Booking table.
Key Characteristics & When to Use
- One Class Per Table: Maps business logic directly to table schemas instead of creating individual entity instances per row.
- Record Set Integration: Pairs naturally with tabular data structures such as Record Sets or DataSets.
- No Inheritance Support: Unlike rich Domain Models, Table Modules do not support object-oriented inheritance relationships.
- Best Suited For: Applications where business logic is moderately simple and structured strictly around relational tables.
Recommended Design Pattern Tutorials:
Click here to watch in Youtube : https://www.youtube.com/watch?v=v_bYm091w3g
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