Question about locking certain folders w/diff.accounts?

I'm about to let my girlfriend use my Mac, so I made a seperate account for her. I just don't want her going through all of my files and " stuff ". Is there anyway to lock certain folders in my account? I tried using parental controls but didn't find the file I wanted to Lock in the options.

Hi Aaron
When your girlfriend is logged in on her account your folders are locked to her. Your Home folders are only accessible from your account.
Matthew Whiting

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Hi All
It is highly appreciated if someone give offer answers to my below questions
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Hi Danny,
I became interested about the optimistic locking recently. If the topic is not long forgotten then this may make some difference!
We have attacked the optimistic locking issue by introducing audit fields (MODIFY_BY_USER, MODIFY_DATE) in tables where concurrency needs to be implemented.
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