Brock20
asked on
Keeping track of JTable changes
Hi,
I am writing an application that displays database tables in a JTable object. I am using this dialog to allow the user to make changes to the table. I am having a hard time designing a way to keep track of user changes. I want to be able to know when the user has made changes so I can save the data to the database.
Later down the road I also may implement an undo feature and may want to keep track of the user changes in general. I have not found much documentation on the web and was wondering if anyone would be able to help?
Thanks for all your help!!
I am writing an application that displays database tables in a JTable object. I am using this dialog to allow the user to make changes to the table. I am having a hard time designing a way to keep track of user changes. I want to be able to know when the user has made changes so I can save the data to the database.
Later down the road I also may implement an undo feature and may want to keep track of the user changes in general. I have not found much documentation on the web and was wondering if anyone would be able to help?
Thanks for all your help!!
CEHJ
Just make a copy of your TableModel
ASKER
So I should have a copy of the TableModel and then compare the data? Wouldn't this take up resourses? I was trying to think of a way to have the model or the view know that something has changed. Not sure if that is the proper way to do it.
It depends what you want to do. If you don't need to know what the changes are, but merely that changes did occur, just calculate the hash code before and after
ASKER
1.) How would I calculate the hash code?
2.) So if I want to know what the changes are you are suggesting to keep two copies of my model? Is this expensive?
2.) So if I want to know what the changes are you are suggesting to keep two copies of my model? Is this expensive?
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