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1)当我执行此查询:此数据存储为什么通过键返回无查询?
contract_record = Contract(book_number = 42, initial_page = 420, final_page = 442)
contract_record.put()
contract_key = contract_record.key()
contract = db.GqlQuery("SELECT * FROM Contract WHERE __key__ = KEY('Contract', '$[contract_key]')").get()
结果是无。为什么?
2)如何使这个查询不是通过键,而是通过key_id? (是这样的:
contract_id = contract_record.key().id()
contract = db.GqlQuery("SELECT * FROM Contract WHERE __key__ = KEY('Contract', '$[contract_id]')").get()
感谢所有帮助
谢谢,@Daniel,我想只有现在我完全理解你以前的建议(上如何通过密钥获取数据存储对象)。真的感谢! – craftApprentice 2012-07-09 15:47:27