Hi, Given the nature of the "put" function (low level hrd API), how can I atomically put a new entity without overwriting an existing one if the keys are chosen by the users (String values)?
Let's say I have 2 simultaneous users that creates at the same time an entity of kind "User" with the custom key "johndoe" (because the user name is the key), I don't want the second one to overwrite the first... I don't want to have a property for the username since I'll have the same "unique index" problem. Is a transaction with a: 1) get 2) catch EntityNotFoundException 3) put 4) commit enough to ensure consistency ? Thanks -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to google-appengine@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
