This approach is inefficient if you must add objects to several schemas because you must keep changing the default schema.
如果必须向多个架构中添加对象，由于必须不断更改默认架构，此方法无效。
It's a lesson, when you are changing lane in high speed way, you must keep looking and watching until you make sure really no problem, then you make change, or accident happens easily.
这是一个教训，当你在高速路上要换道的时候，你一定要保持观看，确定没有问题后才换道，否则事故很容易发生。
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