November 2002
Intermediate to advanced
560 pages
16h 4m
English
Content preview from Patterns of Enterprise Application ArchitectureBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Chapter 2. Organizing Domain Logic
In organizing domain logic I’ve separated it into three primary patterns: Transaction Script (110), Domain Model (116), and Table Module (125).
The simplest approach to storing domain logic is the Transaction Script (110). A Transaction Script (110) is essentially a procedure that takes the input from the presentation, processes it with validations and calculations, stores data in the database, and invokes any operations from other systems. It then replies with more data to the presentation, perhaps doing more calculation to help organize and format the reply. The fundamental organization is of a single procedure for each action that a user might want to do. Hence, we can think of this pattern as being a script ...
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