Please, any idea how to manage concurent requests,
for example like in a shopping cart?
Scenario:
1. I have a counter A (a field in a database row), set to 1, so A=1
2. A client wants 1 unit from A , it checks and it's OK,
there is available.
3. Another client wants 1 unit from A, it checks, and it's OK,
because first client did not subtracted yet 1 unit from A
4. The first client decreases A, so A=0
5. The scond client decreases A, so A=?... some garbage...
Any idea how to fix this transaction problem? If A is locked by the
first client in order to fix this problem, there is another question (the
really one!):
If the program terminates unexpectedly, what about A?
It remains locked forever, and the second client cannot use it
anymore ?
thanx!
any idea really apreciated!
Daniel BI
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