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????1. ????????????“?????????”???????
??????????????????????1.0?汾???ó???????????????1.1?汾???????????????????????????????Ρ???????1.0?汾?????????????1.1?汾??????????
????2. ???????????????????
?????????1.0?汾??????1.1?汾?????????????????????1.1?汾?????????е????????????μ?????汾?????????????????????? ?а???1.0????????????????1.1??????????????????仰??????1.0???????????????????????????Σ???????????????????
????3. ????????????????????????
????SQLiteOpenHelper???????????????????int version?????????????????汾????????????1.0?汾?У????????SQLiteOpenHelper?????????????ò????1??????????汾??1??д?????????????С?
????????1.1?汾????????????????????仯?????????1.1?汾??????????????????1????????????SQLiteOpenHelper??????????μ??????????2??
???????????1.1?3?????1.0?汾?????????????????????????洢???????汾??1?????????3????????????汾???2?????????????????????
????4. ???????????????????????????
?????????????SQLiteOpenHelper????????????????汾?????????????????onUpgrade???????????????????????????????????????????????????????а???汾???????????????????Σ??????????????????????ɡ?
?????°汾?????汾????????onUpgrade??????????????????????????????????????????汾??????????汾??
??????????????????????洢?μ?汾???????????汾???