Java Realm.where方法代码示例

import io.realm.Realm; //导入方法依赖的package包/类
@Override
public Flowable<Optional<List<T>>> getAll(List<T> items) {
    Realm realm = Realm.getDefaultInstance();
    RealmQuery<T> query = realm.where(clazz);

    if(items.size() > 0){
        String paramName = items.get(0).getUniqueIdentifierName();
        Integer[] keys = new Integer[items.size()];
        for(int i = 0; i < items.size(); i++){
            keys[i] = items.get(i).getUniqueIdentifier();
        }
        query.in(paramName, keys);
    }

    List<T> copies = realm.copyFromRealm(query.findAll());
    realm.close();

    return Flowable.just(Optional.wrap(copies));
}
 

import io.realm.Realm; //导入方法依赖的package包/类
/**
 * Get one with a specific filter object
 * @param filter
 * @return
 */
@Override
public Flowable<Optional<T>> getOne(Filter filter, SortingMode sortingMode) {
    Realm realm = Realm.getDefaultInstance();
    RealmQuery<T> query = realm.where(clazz);
    query = filterToQuery(filter, query);
    T item = null;
    if (sortingMode != null) {
        RealmResults<T> items = applySortingMode(sortingMode, query);
        if (!items.isEmpty()) {
            item = items.first();
        }
    } else {
        item = query.findFirst();
    }
    T copy = null;
    if (item != null) {
        copy = realm.copyFromRealm(item);
    }
    realm.close();
    return Flowable.just(Optional.wrap(copy));
}
 

import io.realm.Realm; //导入方法依赖的package包/类
public static RealmResults<Trip> getMissingConfirmTrips(Realm realm) {
    RealmResults<StationUse> uses = realm.where(StationUse.class)
            .greaterThan("entryDate", new Date(new Date().getTime() - TimeUnit.DAYS.toMillis(7))).findAll().where()
            .equalTo("type", "NETWORK_ENTRY").or().equalTo("type", "VISIT").findAll();

    // now we have all station uses that **might** be part of editable trips
    // get all trips that contain these uses and which are yet to be confirmed
    RealmQuery<Trip> tripsQuery = realm.where(Trip.class);
    if (uses.size() > 0) {
        // first item detached from the others because otherwise "Missing left-hand side of OR" might happen
        // https://github.com/realm/realm-java/issues/1014#issuecomment-107235374
        tripsQuery = tripsQuery.equalTo("userConfirmed", false).equalTo("path.station.id", uses.get(0).getStation().getId()).equalTo("path.entryDate", uses.get(0).getEntryDate());
        for (int i = 1; i < uses.size(); i++) {
            tripsQuery = tripsQuery.or().equalTo("userConfirmed", false).equalTo("path.station.id", uses.get(i).getStation().getId()).equalTo("path.entryDate", uses.get(i).getEntryDate());
        }
        return tripsQuery.findAll();
    } else {
        // realm is just terrible. not only is it hard to do a proper WHERE ... IN ... query, it's also hard to generate an empty result set.
        // https://github.com/realm/realm-java/issues/1862
        // https://github.com/realm/realm-java/issues/1575
        // https://github.com/realm/realm-java/issues/4011
        return tripsQuery.equalTo("id", "NEVER_BE_TRUE").findAll();
    }
}
 

import io.realm.Realm; //导入方法依赖的package包/类
@Override
public Flowable<Integer> deleteAll() {
    final Realm realm = Realm.getDefaultInstance();
    realm.beginTransaction();
    RealmQuery<T> query = realm.where(clazz);
    long count = query.count();
    realm.delete(clazz);
    realm.commitTransaction();
    realm.close();

    return Flowable.just((int)count);
}
 

import io.realm.Realm; //导入方法依赖的package包/类
public static <O extends  RealmObject> O get(Realm realmInstance, QueryFilters filters, Class<O> clazz) throws LocalDataNotFoundException{
    Realm realm = realmInstance;
    RealmQuery<O> query = realm.where(clazz);
    query = filters.copyToRealmQuery(query);
    O result = query.findFirst();
    if(result != null){
        O finalResult = realm.copyFromRealm(result);
        realm.close();
        return finalResult;
    }
    throw new SessionNotFoundException("queried data is not found");
}
 

import io.realm.Realm; //导入方法依赖的package包/类
public static <O extends  RealmObject> void delete(Realm realmInstance, QueryFilters filters, Class<O> clazz){
    Realm realm = realmInstance;
    realm.beginTransaction();
    RealmQuery<O> query = realm.where(clazz);
    query = filters.copyToRealmQuery(query);
    final RealmResults<O> results = query.findAll();
    results.deleteAllFromRealm();
    realm.commitTransaction();
    realm.close();
}
 

import io.realm.Realm; //导入方法依赖的package包/类
public static <O extends RealmObject> List<O> getList(Realm realmInstance, QueryFilters filters, Class<O> clazz) throws LocalDataNotFoundException{
    Realm realm = realmInstance;
    RealmQuery<O> query = realm.where(clazz);
    query = filters.copyToRealmQuery(query);
    List<O> results = realm.copyFromRealm(query.findAll());
    realm.close();
    return results;
}
 

import io.realm.Realm; //导入方法依赖的package包/类
private void refreshData(){
    Realm realm = Realm.getDefaultInstance();
    RealmQuery<NotesModel> notesModelRealmQuery = realm.where(NotesModel.class);
    RealmResults<NotesModel> query = notesModelRealmQuery.findAll();
    notesList.clear();
    notesList.addAll(query);
    notesAdapter.notifyDataSetChanged();
}