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does local access database need lock()?

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I am doing FBN project. When we directly assess the Data class locally, for the ticket booking function, do we need lock() and unlock() functions just like Network access does? I think that we do not need lock() and unlock() functions here because only one user can assess that db.db file locally. There are no multi-threads here. There is no way the sequence-read, modify and write can be changed.
Any thought about htis? Please help.
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