November 2002
Intermediate to advanced
560 pages
16h 4m
English
Content preview from Patterns of Enterprise Application Architecture
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Chapter 11. Object-Relational Behavioral Patterns
Unit of Work
Maintains a list of objects affected by a business transaction and coordinates the writing out of changes and the resolution of concurrency problems.
When you’re pulling data in and out of a database, it’s important to keep track of what you’ve changed; otherwise, that data won’t be written back into the database. Similarly you have to insert new objects you create and remove any objects you delete.
You can change the database with each change to your object model, but this can lead to lots of very small database calls, which ends up being very slow. Furthermore it requires you to ...
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