????sqllie??????????????????????????????android????? ?????????????????????
??????????????????????????1????
????1.??????? ???? SqliteOpenHelper ???????????????:
??????д?????????? ;???δ????????????????? onCreate(SQLiteDatabase db) {} ;???????? onUpgrade(SQLiteDatabase db?? int arg1?? int arg2)??
????oncreate????????????δ????????????????????????????????????????????????????1???????汾??????????????ε??????????????????????? onUpgrade???? ??????????????? ????????????????д????????????????????????????????????????Щ????????????м??ɡ?
????2.?д???巽????????壺
????‘??????? SqliteOpenHelper?? ????????getReadableDatabase()????getWritableDatabase()??????????????????????????
??????????????????????????????????????????getReadableDatabase()?????????????getWritableDatabase()??????????getReadableDatabase????????????? ??????getWritableDatabase????????????????????? getWritableDatabase?????????????????? ??????????????????????????????????????????????????????????“д”???????????insert??delete??update??????????????
????getReadableDatabase???????????????getWritableDatabase??????????????????????????????????????????????????????????????????????????????
????3. ???????????????
????SQLite??????????? ???????Щ??????????????????? CRUD;?????????t???? ??Щ????????????????????????????????д???????????????????????????д???????????????????o??