Examples of org.apache.ojb.broker.query.QueryByCriteria

org.apache.ojb.broker.query.QueryByCriteria
represents a search by criteria. "find all articles where article.price > 100" could be represented as: Criteria crit = new Criteria(); crit.addGreaterThan("price", new Double(100)); Query qry = new QueryByCriteria(Article.class, crit); The PersistenceBroker can retrieve Objects by Queries as follows: PersistenceBroker broker = PersistenceBrokerFactory.createPersistenceBroker(); Collection col = broker.getCollectionByQuery(qry); Creation date: (24.01.2001 21:45:46) @author Thomas Mahler @version $Id: QueryByCriteria.java,v 1.26.2.4 2005/12/21 22:27:09 tomdz Exp $

        // retrieve folder from database
        try
        {
            Criteria filter = new Criteria();
            filter.addEqualTo("path", folderPath);
            QueryByCriteria query = QueryFactory.newQuery(FolderImpl.class, filter);
            Folder folder = (Folder)getPersistenceBrokerTemplate().getObjectByQuery(query);
            
            // return folder or throw exception
            if (folder == null)
            {

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        try
        {
            // query for folders
            Criteria filter = new Criteria();
            filter.addEqualTo("parent", folderImpl.getId());
            QueryByCriteria query = QueryFactory.newQuery(FolderImpl.class, filter);
            Collection folders = getPersistenceBrokerTemplate().getCollectionByQuery(query);


            // cache folders in folder
            folderImpl.accessFolders().clear();
            if (folders != null)

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        try
        {
            // query for pages
            Criteria filter = new Criteria();
            filter.addEqualTo("parent", folderImpl.getId());
            QueryByCriteria query = QueryFactory.newQuery(PageImpl.class, filter);
            Collection pages = getPersistenceBrokerTemplate().getCollectionByQuery(query);


            // cache pages in folder
            folderImpl.accessPages().clear();
            if (pages != null)

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        try
        {
            // query for links
            Criteria filter = new Criteria();
            filter.addEqualTo("parent", folderImpl.getId());
            QueryByCriteria query = QueryFactory.newQuery(LinkImpl.class, filter);
            Collection links = getPersistenceBrokerTemplate().getCollectionByQuery(query);


            // cache links in folder
            folderImpl.accessLinks().clear();
            if (links != null)

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            try
            {
                // query for page security
                Criteria filter = new Criteria();
                filter.addEqualTo("parent", folderImpl.getId());
                QueryByCriteria query = QueryFactory.newQuery(PageSecurityImpl.class, filter);
                PageSecurity document = (PageSecurity)getPersistenceBrokerTemplate().getObjectByQuery(query);


                // cache page security in folder
                folderImpl.resetPageSecurity((PageSecurityImpl)document, true);
            }

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        {
            // query for all nodes
            List all = DatabasePageManagerUtils.createList();
            Criteria filter = new Criteria();
            filter.addEqualTo("parent", folderImpl.getId());
            QueryByCriteria query = QueryFactory.newQuery(FolderImpl.class, filter);
            Collection folders = getPersistenceBrokerTemplate().getCollectionByQuery(query);
            if (folders != null)
            {
                all.addAll(folders);
            }

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            // construct general node query criteria
            Criteria filter = new Criteria();
            filter.addEqualTo("parent", folderImpl.getId());


            // update pages
            QueryByCriteria query = QueryFactory.newQuery(PageImpl.class, filter);
            Collection pages = getPersistenceBrokerTemplate().getCollectionByQuery(query);
            if (pages != null)
            {
                Iterator pagesIter = pages.iterator();
                while (pagesIter.hasNext())

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            // construct general node query criteria
            Criteria filter = new Criteria();
            filter.addEqualTo("parent", folderImpl.getId());


            // remove folders first: depth first recursion
            QueryByCriteria query = QueryFactory.newQuery(FolderImpl.class, filter);
            Collection folders = getPersistenceBrokerTemplate().getCollectionByQuery(query);
            if (folders != null)
            {
                Iterator foldersIter = folders.iterator();
                while (foldersIter.hasNext())

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   */
  public final Collection retrieveExtent(final Class clazz) {


    PersistenceBroker broker = getPersistenceBroker();


    Query query = new QueryByCriteria(clazz, null);
    Collection collection = new ArrayList();


    collection = broker.getCollectionByQuery(query);


    return collection;

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        try
        {
            broker = PersistenceBrokerFactory.defaultPersistenceBroker();


            QueryByCriteria query = new QueryByCriteria(template);


            result = (Product)broker.getObjectByQuery(query);
        }
        finally
        {

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