How do I handle data change tracking in SOA

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Where I work it has been decided that we are going to use rest services to return data to clients. Currently this is just .NET Clients (WPF and ASP.NET) but in the future could be anything a 3rd party wishes to use.

The issue being thrown about is how you handle change tracking of the data. So you make a call to get an employee entity (which may have many children) change one piece of data and call an update method on the service passing the changed entity. How does the service know what has changed to perform the update? Current thinking is you either update all records related to the model or provide a property on the entity for 'change status' and let the client be responsible for notifying what object has changed. Neither of which seems the ideal solution.

Surely someone else has solved this issue before us....

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For example if you have an employee object returned which has lots of 'SalaryPayments', if one of the salary payments was changed I would not want to update all of them.

Posted 26-Jan-15 3:26am

Tony Pazzard

Updated 26-Jan-15 4:34am

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Dave Kreskowiak · Answer 1 · 2015-01-26T04:30:00

Solution 1

Why would the service need to know what has changed? Give an example of what you're thinking here.

It normally just writes the entire record back to the database without having a clue about what changed. It assumes everything has changed, except the record ID of course.

Posted 26-Jan-15 4:30am

Dave Kreskowiak