Examples of org.hibernate.Criteria.uniqueResult()

org.hibernate.Criteria.uniqueResult()
Convenience method to return a single instance that matches the query, or null if the query returns no results. @return the single result or null @throws HibernateException if there is more than one matching result

      c.add(Restrictions.eq("xmlId", xmlId));
    } else {
      c.add(Restrictions.isNull("xmlId"));
    }
    
    ContentElement e = (ContentElement) c.uniqueResult();


    // If it doesn't exist, create it
    if (e == null) {
      e = new ContentElement(loc);
      if (xmlId != null)

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        checkSession();


        Criteria query = verCfg.getRevisionInfoQueryCreator().getRevisionDateQuery(session, revision);


        try {
            Object timestampObject = query.uniqueResult();
            if (timestampObject == null) {
                throw new RevisionDoesNotExistException(revision);
            }


            // The timestamp object is either a date or a long

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        checkSession();


        Criteria query = verCfg.getRevisionInfoQueryCreator().getRevisionNumberForDateQuery(session, date);


        try {
            Number res = (Number) query.uniqueResult();
            if (res == null) {
                throw new RevisionDoesNotExistException(date);
            }


            return res;

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        Set<Number> revisions = new HashSet<Number>(1);
        revisions.add(revision);
        Criteria query = verCfg.getRevisionInfoQueryCreator().getRevisionsQuery(session, revisions);


        try {
            T revisionData = (T) query.uniqueResult();


            if (revisionData == null) {
                throw new RevisionDoesNotExistException(revision);
            }

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                                     + "'org.hibernate.envers.track_entities_changed_in_revision' parameter to true.");
        }
        Set<Number> revisions = new HashSet<Number>(1);
        revisions.add(revision);
        Criteria query = verCfg.getRevisionInfoQueryCreator().getRevisionsQuery(session, revisions);
        Object revisionInfo = query.uniqueResult();
        if (revisionInfo != null) {
            // If revision exists.
            Set<String> entityNames = verCfg.getModifiedEntityNamesReader().getModifiedEntityNames(revisionInfo);
            if (entityNames != null) {
                // Generate result that contains entity names and corresponding Java classes.

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                            .add(Projections.property("we.wert"), "identifier")
                            .add(Projections.property("ve.wert"), "title")
                    )
                    .setResultTransformer(Transformers.aliasToBean(GoobiProcess.class));


            result = (GoobiProcess) criteria.uniqueResult();


        } catch (HibernateException he) {
            myLogger.error("Catched Hibernate exception: " + he.getMessage());
        }

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   * @return Object
   */
  public T findByCriterion(Criterion[] criterions,Order ...orders){
    Criteria criteria = createCriteria(criterions);
    setOrderToCriteria(criteria, orders);
    return (T)criteria.uniqueResult();
  }


  /**
   * 通过{@link PropertyFilter} 查询单个orm实体
   *

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   * 
   * @return Object
   */
  public T findUniqueByCriterion(Criterion[] criterions){
    Criteria criteria = createCriteria(criterions);
    return (T)criteria.uniqueResult();
  }


  /**
   * 通过orm实体的属性名称查询单个orm实体
   *

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   * @return Object
   */
  public T findUniqueByProperty(String propertyName,Object value,String restrictionName) {
    Criterion criterion = HibernateRestrictionBuilder.getRestriction(propertyName, value, restrictionName);
    Criteria criteria = createCriteria(criterion);
    return (T) criteria.uniqueResult();
  }


  /**
   * 通过{@link PropertyFilter}和分页请求参数获取分页对象
   *

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    crit.setProjection(Projections.rowCount());
    
    String msg1 = Helper.getTranslation("batch");
    String msg2 = Helper.getTranslation("prozesse");
    if (id != null) {
      String text = msg1 + " " + id + " (" + crit.uniqueResult() + " " + msg2 + ")";
      return new Batch(id, text);
    } else {
      String text = Helper.getTranslation("withoutBatch") + " (" + crit.uniqueResult() + " " + msg2 + ")";
      return new Batch(null, text);
    }

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