Example usage for javax.persistence.criteria CriteriaQuery from

Introduction

In this page you can find the example usage for javax.persistence.criteria CriteriaQuery from.

Prototype

<X> Root<X> from(Class<X> entityClass);

Source Link

Document

Create and add a query root corresponding to the given entity, forming a cartesian product with any existing roots.

Usage

From source file:ch.puzzle.itc.mobiliar.business.server.boundary.ServerView.java

public List<ServerTuple> getAppServers(String hostFilter, String appServerFilter, String runtimeFilter,
        String nodeFilter, String contextFilter) {

    CriteriaBuilder cb = entityManager.getCriteriaBuilder();

    CriteriaQuery<ServerTuple> q = cb.createQuery(ServerTuple.class);

    //get Node ResType
    Root<ResourceEntity> node = q.from(ResourceEntity.class);
    Join<ResourceEntity, ResourceTypeEntity> nodeType = node.join("resourceType", JoinType.LEFT);
    Join<ResourceEntity, ReleaseEntity> nodeRelease = node.join("release", JoinType.LEFT);

    //get AppServer
    Join<ResourceEntity, ConsumedResourceRelationEntity> nodeResRel = node.join("consumedSlaveRelations",
            JoinType.LEFT);//from ww w. ja  v a  2  s . co m
    Join<ConsumedResourceRelationEntity, ResourceEntity> appServer = nodeResRel.join("masterResource",
            JoinType.LEFT);
    Join<ResourceEntity, ReleaseEntity> asRelease = appServer.join("release", JoinType.LEFT);
    Join<ResourceEntity, ResourceTypeEntity> asType = appServer.join("resourceType", JoinType.LEFT);

    //get Runtime of as
    Join<ResourceEntity, ConsumedResourceRelationEntity> asResRel = appServer.join("consumedMasterRelations",
            JoinType.LEFT);
    Join<ConsumedResourceRelationEntity, ResourceEntity> asRuntime = asResRel.join("slaveResource",
            JoinType.LEFT);
    Join<ResourceEntity, ResourceTypeEntity> runtimeType = asRuntime.join("resourceType", JoinType.LEFT);

    //get Props between as and node
    Join<ConsumedResourceRelationEntity, ResourceRelationContextEntity> resRelCtx = nodeResRel.join("contexts",
            JoinType.LEFT);
    Join<ResourceRelationContextEntity, ContextEntity> asCtx = resRelCtx.join("context", JoinType.LEFT);
    Join<ContextEntity, ContextEntity> asDomain = asCtx.join("parent", JoinType.LEFT);

    Join<ResourceRelationContextEntity, PropertyEntity> asProp = resRelCtx.join("properties", JoinType.LEFT);
    //here an on clause should be added, so we don't get hostnames that are divined directly on the node multiple times (and descriptor.propertyName = 'hostName')
    //on support was added in jpa 2.1 which is part of JEE 7
    Join<PropertyEntity, PropertyDescriptorEntity> asPropType = asProp.join("descriptor", JoinType.LEFT);

    q.select(cb.construct(ServerTuple.class, asProp.get("value"), appServer.get("name"), appServer.get("id"),
            asRelease.get("name"), asRuntime.get("name"), node.get("name"), node.get("id"),
            nodeRelease.get("name"), asDomain.get("name"), asDomain.get("id"), asCtx.get("name"),
            asCtx.get("id"), cb.literal(0) //false
    ));

    Predicate p = cb.and(cb.equal(nodeType.get("name"), DefaultResourceTypeDefinition.NODE.name()),
            cb.equal(asType.get("name"), DefaultResourceTypeDefinition.APPLICATIONSERVER.name()),
            cb.or(cb.equal(runtimeType.get("name"), ResourceTypeEntity.RUNTIME),
                    cb.isNull(runtimeType.get("name"))),
            cb.isNotNull(asProp.get("value")), cb.equal(asPropType.get("propertyName"), "hostName"));

    p = addFilters(p, cb, hostFilter, appServerFilter, runtimeFilter, nodeFilter, contextFilter,
            asProp.<String>get("value"), appServer.<String>get("name"), asRuntime.<String>get("name"),
            node.<String>get("name"), asCtx.<String>get("name"));

    q.where(p);

    TypedQuery<ServerTuple> query = entityManager.createQuery(q);
    List<ServerTuple> servers = query.getResultList();

    return servers;
}

---

From source file:com.creditcloud.common.entities.dao.AbstractReadDAO.java

/**
 * count all entity/*from   w  w  w . j a  v a  2 s  . co m*/
 *
 * @return
 */
public int count() {
    EntityManager em = getEntityManager();
    CriteriaBuilder cb = em.getCriteriaBuilder();
    CriteriaQuery cq = cb.createQuery();
    Root<T> rt = cq.from(entityClass);
    cq.select(cb.count(rt));
    Query q = em.createQuery(cq);
    Object result = q.getSingleResult();
    return result == null ? 0 : ((Long) result).intValue();
}

---

From source file:net.echinopsii.ariane.community.plugin.rabbitmq.directory.RabbitmqDirectoryBootstrap.java

private void plugDirectoryJPAProvider() {
    Company pivotal = null;/*from   w  w  w  . j  ava  2  s  .co m*/
    Application rabbitmq = null;

    directoryJpaProvider.addSubPersistenceBundle(FrameworkUtil.getBundle(RabbitmqDirectoryBootstrap.class));

    EntityManager em = directoryJpaProvider.createEM();
    CriteriaBuilder builder = em.getCriteriaBuilder();

    CriteriaQuery<Company> cmpCriteria = builder.createQuery(Company.class);
    Root<Company> cmpRoot = cmpCriteria.from(Company.class);
    cmpCriteria.select(cmpRoot).where(builder.equal(cmpRoot.<String>get("name"), "Pivotal"));
    TypedQuery<Company> cmpQuery = em.createQuery(cmpCriteria);
    try {
        pivotal = cmpQuery.getSingleResult();
        log.debug("Pivotal company already defined ...");
    } catch (NoResultException e) {
        log.debug("Pivotal company will be defined ...");
    } catch (Exception e) {
        throw e;
    }

    CriteriaQuery<Application> appCriteria = builder.createQuery(Application.class);
    Root<Application> appRoot = appCriteria.from(Application.class);
    appCriteria.select(appRoot).where(builder.equal(appRoot.<String>get("name"), "RabbitMQ"));
    TypedQuery<Application> appQuery = em.createQuery(appCriteria);
    try {
        rabbitmq = appQuery.getSingleResult();
        log.debug("RabbitMQ application already defined ...");
    } catch (NoResultException e) {
        log.debug("RabbitMQ application will be defined ...");
    } catch (Exception e) {
        throw e;
    }

    em.getTransaction().begin();

    if (pivotal == null) {
        pivotal = new Company().setNameR("Pivotal").setDescriptionR("Pivotal");
        em.persist(pivotal);
    }

    if (rabbitmq == null) {
        rabbitmq = new Application().setNameR("RabbitMQ").setCompanyR(pivotal).setShortNameR("RabbitMQ")
                .setColorCodeR("ff6600").setDescriptionR("Robust messaging for applications");
        em.persist(rabbitmq);
    }

    if (!pivotal.getApplications().contains(rabbitmq)) {
        pivotal.getApplications().add(rabbitmq);
    }

    em.flush();
    em.getTransaction().commit();
}

---

From source file:edu.sabanciuniv.sentilab.sare.models.base.documentStore.PersistentDocumentStore.java

/**
 * Gets identifiers of documents in this store.
 * @param em the {@link EntityManager} to get the documents from.
 * @return an {@link Iterable} of document identifiers.
 *//*  www .j a v  a2s. c  o  m*/
public Iterable<byte[]> getDocumentIds(EntityManager em) {
    Validate.notNull(em, CannedMessages.NULL_ARGUMENT, "em");

    CriteriaBuilder cb = em.getCriteriaBuilder();
    CriteriaQuery<byte[]> cq = cb.createQuery(byte[].class);
    Root<PersistentDocument> doc = cq.from(PersistentDocument.class);
    cq.multiselect(doc.get("id"))
            .where(cb.equal(doc.get("store"), cb.parameter(PersistentDocumentStore.class, "store")));
    TypedQuery<byte[]> tq = em.createQuery(cq);
    tq.setParameter("store", this);
    return tq.getResultList();
}

---

From source file:eu.uqasar.service.AbstractService.java

private <T extends Persistable> List<T> getRange(Class<T> clazz, int first, int count) {
    logger.infof("loading %d %s starting from %d  ...", count, getReadableClassName(clazz), first);
    CriteriaBuilder cb = em.getCriteriaBuilder();
    CriteriaQuery<T> query = cb.createQuery(clazz);
    query.from(clazz);
    return em.createQuery(query).setFirstResult(first).setMaxResults(count).getResultList();
}

---

From source file:bq.jpa.demo.query.criteria.service.CriteriaService.java

/**
 * use aliases//from ww w. ja v  a  2  s .  c o m
 */
@Transactional
public void doSelect4() {
    CriteriaBuilder cb = em.getCriteriaBuilder();
    CriteriaQuery<String> c = cb.createQuery(String.class);
    Root<Employee> e = c.from(Employee.class);
    c.select(e.<String>get("name").alias("fullname"));
    showResult(c);
}

---

From source file:bq.jpa.demo.query.criteria.service.CriteriaService.java

/**
 * SELECT e.name FROM jpa_query_employee'
 *///  w ww  .  ja v a 2 s  . c  o  m
@Transactional
public void doSelect1() {
    CriteriaBuilder cb = em.getCriteriaBuilder();
    CriteriaQuery<String> c = cb.createQuery(String.class);
    Root<Employee> e = c.from(Employee.class);
    c.select(e.<String>get("name"));

    showResult(c);
}

---

From source file:eu.uqasar.service.AbstractService.java

public <T extends Persistable> List<T> getAll(Class<T> clazz) {
    logger.infof("loading all %ss ...", getReadableClassName(clazz));
    CriteriaBuilder cb = em.getCriteriaBuilder();
    CriteriaQuery<T> criteria = cb.createQuery(clazz);
    criteria.from(clazz);
    return em.createQuery(criteria).getResultList();
}

---

From source file:eu.uqasar.service.AbstractService.java

private <T extends Persistable> List<T> getRangeOrdered(Class<T> clazz, int first, int count, Order... orders) {
    logger.infof("loading %d %s starting from %d  ...", count, getReadableClassName(clazz), first);
    CriteriaBuilder cb = em.getCriteriaBuilder();
    CriteriaQuery<T> query = cb.createQuery(clazz);
    query.from(clazz);
    if (orders != null && orders.length > 0) {
        query.orderBy(orders);//from   w w  w  .  j a  v a  2s . com
    }
    return em.createQuery(query).setFirstResult(first).setMaxResults(count).getResultList();
}

---

From source file:bq.jpa.demo.query.criteria.service.CriteriaService.java

/**
 * order by://from  w  ww.  j av  a  2  s . com
 * SELECT e.name, e.salary FROM jpa_query_employee e ORDER BY e.name DESC, e.salary DESC
 */
public void doOrderby() {
    CriteriaBuilder cb = em.getCriteriaBuilder();
    CriteriaQuery<Object[]> c = cb.createQuery(Object[].class);
    Root<Employee> e = c.from(Employee.class);
    c.multiselect(e.get("name"), e.get("salary")).orderBy(cb.desc(e.get("name")), cb.desc(e.get("salary")));

    showResult(c);
}

---

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