RestoreDbTask.java 文件源码

/**
 * Returns the profile id used in the favorites table of the provided db.
 */
protected long getDefaultProfileId(SQLiteDatabase db) throws Exception {
    try (Cursor c = db.rawQuery("PRAGMA table_info (favorites)", null)){
        int nameIndex = c.getColumnIndex(INFO_COLUMN_NAME);
        while (c.moveToNext()) {
            if (Favorites.PROFILE_ID.equals(c.getString(nameIndex))) {
                return c.getLong(c.getColumnIndex(INFO_COLUMN_DEFAULT_VALUE));
            }
        }
        throw new InvalidObjectException("Table does not have a profile id column");
    }
}