Charles Whitaker wrote:
Using persistant connections simply means that you will be given a connection from a pool of open connections rather than creating a new one each time. There is no guarantee you'll get the same connection from request to request.

Right. I had assumed that I would get a connection previously initiated by me, and that there would therefore be only one, so I would always get the same connection. So much for assumptions.

I would suggest you add another field to the table you are trying to lock. Put an ID in there that you can pass from request to request. Use the locking feature to lock the table, read that value for a record, if it's not set to something write your ID to it then unlock it. If it does already contain an ID you treat it as locked. you just need to make sure you unlock the row when you're done (probably by setting that value to NULL.

If you're already using sessions I would strongly recommend using the session ID as the lock ID. If not you can easily generate one but you'll need to pass it manually from request to request.

I did as you suggest, and it seems to work fine. I surrounded the lock code with get_lock() and release_lock(), to make it quasi-atomic.

Thanks for the suggestion, and thanks to Charles Morris as well for his response.

No problem, but please include the list when replying in future.



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