解决数据库db_version升级时，报出nullpointerexception。主要是FinalDb里面的dropDb方法，需要把db… #103
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…当做参数传过去，而不能使用全局的db 变量。
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解决数据库db_version升级时，报出nullpointerexception。主要是FinalDb里面的dropDb方法，需要把db当做参数传过去，而不能使用全局的db 变量。