- Pattern Overview
- Unit of Work is an OCR pattern for tracking database changes
- Pattern uses single transaction to save changes to database
- Multiple implementation approaches exist, including collections and states
- Implementation Components
- Operations enumeration defines database operations
- Interface contains register and commit methods
- Identity Map prevents duplicate object registrations
- Database Manager handles connections and transactions
- Common Problems
- Duplicate objects can occur, solved by Identity Map
- Priority issues require PriorityQueues instead of arrays
- PHP's SplPriorityQueue can be used for priority handling