hello everyone I have several fields which must be unique because of business logic.how can app engine make the unique key for the several fields?
For example, in a Server "A" ,I query a value and find there is no existing value , so I insert value into Server "A" successfully. But almost the same time , another one can do the same thing(insert the same record) successfully in Server "B". Because at this time , Server "A" and Server "B" are not consistent, the prior inserts will all be successful. how can I avoid to insert the same records? -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
