Scenario: You wish to change the name of this database from TESTDB to NEWNAME.
场景：希望将数据库名从testdb改为newname。
The second form leaves func as a standard Python function, but optimizes calls involving newname.
第二种形式把func作为标准的python函数，但是优化了涉及newname的调用。
The second form leaves func as a standard Python function, but optimizes calls involving newname.
第二种形式把func作为标准的python函数，但是优化了涉及newname的调用。
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