I have another question. to a unique field which cannot have same value, before I insert a record , I must check if there is same value in the field.
it seems impossible to make the constraint in cloud platform. because when I insert the record , maybe other one can insert the same record at the same time. that will break uniqueness of the field . thanks in advance laughsmile -- 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 [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
