@Override
        public void onUpgrade(Database db, int oldVersion, int newVersion) {
            Log.i("greenDAO", "Upgrading schema from version " + oldVersion + " to " + newVersion + " by dropping all tables");
            dropAllTables(db, true);
            onCreate(db);
        }
WARNING: Drops all table on Upgrade! Use only during development.
app/src/main/java/com/zhao/myreader/greendao/gen/DaoMaster.java