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I made a Gae application and encountered many problems when using datastore. datastore has many restrictions, which are different from the previously used relational databases. I have summarized them myself to avoid forgetting them. This document does not describe how to use the Google App Engine datastore API. Only entity can be returned for any query, so select * From someentity is required. Only cert
Google App Engine is simply a free host space that supports the J2EE and Python runtime environments and a * .appspot.com second-level domain name. The biggest advantage is that it is free, whether it is CPU or bandwidth for ordinary small websites are more than enough. However, Gae has many restrictions. I would like to share with you the various restrictions I have encountered in the J2EE project on Gae.
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