问Android -使用ORMLite DAO作为ContentProvider

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public class CardProvider extends ContentProvider {

private InternalDatabase dbhelper;
private RuntimeExceptionDao<Card, UUID> cardDao;

/**
 * Content authority for this provider.
 */
private static final String AUTHORITY = CardUris.CONTENT_AUTHORITY;

// The constants below represent individual URI routes, as IDs. Every URI pattern recognized by
// this ContentProvider is defined using sUriMatcher.addURI(), and associated with one of these
// IDs.
//
// When a incoming URI is run through sUriMatcher, it will be tested against the defined
// URI patterns, and the corresponding route ID will be returned.
/**
 * URI ID for route: /cards
 */
public static final int ROUTE_CARDS = 1;

/**
 * URI ID for route: /cards/{ID}
 */
public static final int ROUTE_CARDS_ID = 2;

/**
 * UriMatcher, used to decode incoming URIs.
 */
private static final UriMatcher sUriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
static {
    sUriMatcher.addURI(AUTHORITY, "cards", ROUTE_CARDS);
    sUriMatcher.addURI(AUTHORITY, "cards/*", ROUTE_CARDS_ID);
}

@Override
public int delete(Uri arg0, String arg1, String[] arg2) {
    // TODO Auto-generated method stub
    return 0;
}

@Override
public String getType(Uri uri) {
    final int match = sUriMatcher.match(uri);
    switch (match) {
        case ROUTE_CARDS:
            return CardUris.CONTENT_CARDS;
        case ROUTE_CARDS_ID:
            return CardUris.CONTENT_ITEM_CARD;
        default:
            throw new UnsupportedOperationException("Unknown uri: " + uri);
    }
}

@Override
public Uri insert(Uri arg0, ContentValues arg1) {
    // TODO Auto-generated method stub
    return null;
}

@Override
public boolean onCreate() {
    dbhelper = OpenHelperManager.getHelper(getContext(), InternalDatabase.class);
    cardDao = dbhelper.getRuntimeExceptionDao(Card.class);
    return true;
}

@Override
public Cursor query(Uri uri, String[] arg1, String arg2, String[] arg3,
        String arg4) {

    int uriMatch = sUriMatcher.match(uri);
    switch (uriMatch) {
        case ROUTE_CARDS_ID:
            /*String id = uri.getLastPathSegment();
            Card card = null;
            try {
                card = cardDao.queryBuilder().where().eq(Entry.ID_FIELD_NAME, id).queryForFirst();
            } catch (SQLException e) {
                e.printStackTrace();
            }*/
            //return null;
        case ROUTE_CARDS:
            // Return all known entries.
            // Note: Notification URI must be manually set here for loaders to correctly
            // register ContentObservers.
            // build your query
            QueryBuilder<Card, UUID> qb = cardDao.queryBuilder();

            // when you are done, prepare your query and build an iterator
            CloseableIterator<Card> iterator = null;
            Cursor cursor = null;
            try {
                //qb.query();
                iterator = cardDao.iterator(qb.where().eq("relevant", 1).and().eq("removed", false).prepare());
               // get the raw results which can be cast under Android
               AndroidDatabaseResults results =
                   (AndroidDatabaseResults)iterator.getRawResults();
               cursor = results.getRawCursor();
            } catch (SQLException e) {
                e.printStackTrace();
            } finally {
               //iterator.closeQuietly();
            }
            cursor.setNotificationUri(this.getContext().getContentResolver(), uri);
            return cursor;
        default:
            throw new UnsupportedOperationException("Unknown uri: " + uri);
    }

}

@Override
public int update(Uri arg0, ContentValues arg1, String arg2, String[] arg3) {
    // TODO Auto-generated method stub
    return 0;
}

}