“Android Java onupgrade ()” Ответ

Android Java onupgrade ()

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
    // Loop through each version when an upgrade occurs.
    for (int version = oldVersion + 1; version <= newVersion; version++) {
        switch (version) {

            case 2:
                // Apply changes made in version 2
                db.execSQL(
                    "ALTER TABLE " +
                    TABLE_PRODUCTS +
                    " ADD COLUMN " +
                    COLUMN_DESCRIPTION +
                    " TEXT;"
                );
                break;

            case 3:
                // Apply changes made in version 3
                db.execSQL(CREATE_TABLE_TRANSACTION);
                break;
        }
    }
}