KITFORMA · EDITORIAL GUIDE
How do I stop two requests from overwriting each other’s edits?
KitForma editorial guide. Reading a value, changing it in application memory and writing it back can lose an intervening update. The correct fix depends on the business operation.
Step-by-step guidance
Reading a value, changing it in application memory and writing it back can lose an intervening update. The correct fix depends on the business operation.
For arithmetic use an atomic update such as
SET quantity = quantity + 1. For document edits use optimistic concurrency: update where both ID and expected version match, then require one affected row. Test two clients editing the same starting version. A zero-row result is a conflict, not a successful save. Row locks are another option, but should not be held while waiting for a human to finish a form.Sources and verification
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