android sqlite数据库表字段更新,调用onUpgrade方法出现了Can't upgrade read-only database from version 3 to 4: 异常,有哪个大神碰到过或者知道怎么解决。
代码:
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
String sql = " alter table person modify phone varchar(100)";
db.execSQL(sql);
}