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                                            daelan-zhou

数据库升级默认方法有问题

https://github.com/kymjs/KJFrameForAndroid/blob/master/KJFrame/kjframe/src/main/java/org/kymjs/kjframe/KJDB.java#L826 这里调用 dropDb() 方法，而方法里的 `Cursor cursor = db.rawQuery( "SELECT name FROM sqlite_master WHERE type ='table'", null);` db 这会儿还是null,会有异常