Is the onUpgrade method of SQLiteOpenHelper ever called? If so, when is it called and by what? If it is not called by the developers, then why is it there? What really happens with that function? I have seen examples where it drops all the tables, but then a comment says that dropping all the tables is not what you should do. Any suggestions? eve
阅读背景：
是否曾调用过onUpgrade方法？
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