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 $

        // always read in to get a fresh copy for merge
        Criteria c = new Criteria();
        c.addEqualTo("dtype", DISCRIMINATOR_PORTLET);
        c.addEqualTo("applicationName", appName);
        c.addEqualTo("portletName", portletName);         
        QueryByCriteria query = QueryFactory.newQuery(DatabasePreference.class, c);
        Map<String, DatabasePreference> mergeMap = new HashMap<String, DatabasePreference>();
        List<DatabasePreference> deletes = new LinkedList<DatabasePreference>();
        List<DatabasePreference> updates = new LinkedList<DatabasePreference>();
        List<PortletPreference> inserts = new LinkedList<PortletPreference>();
        Iterator<DatabasePreference> preferences = getPersistenceBrokerTemplate().getIteratorByQuery(query);

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        // retrieve page element from database
        try
        {
            Criteria filter = new Criteria();
            filter.addEqualTo("path", path);
            QueryByCriteria query = QueryFactory.newQuery(fragmentsElementImplType, filter);
            BaseFragmentsElement fragmentsElement = (BaseFragmentsElement)getPersistenceBrokerTemplate().getObjectByQuery(query);
            
            // return page element or throw exception
            if (fragmentsElement == null)
            {

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

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        // retrieve document from database
        try
        {
            Criteria filter = new Criteria();
            filter.addEqualTo("path", path);
            QueryByCriteria query = QueryFactory.newQuery(PageSecurityImpl.class, filter);
            PageSecurity document = (PageSecurity)getPersistenceBrokerTemplate().getObjectByQuery(query);
            
            // return page or throw exception
            if (document == null)
            {

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        // 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", new Integer(folderImpl.getIdentity()));
            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", new Integer(folderImpl.getIdentity()));
            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 page templates
            Criteria filter = new Criteria();
            filter.addEqualTo("parent", new Integer(folderImpl.getIdentity()));
            QueryByCriteria query = QueryFactory.newQuery(PageTemplateImpl.class, filter);
            Collection pageTemplates = getPersistenceBrokerTemplate().getCollectionByQuery(query);


            // cache page templates in folder
            folderImpl.accessPageTemplates().clear();
            if (pageTemplates != null)

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        try
        {
            // query for dynamic pages
            Criteria filter = new Criteria();
            filter.addEqualTo("parent", new Integer(folderImpl.getIdentity()));
            QueryByCriteria query = QueryFactory.newQuery(DynamicPageImpl.class, filter);
            Collection dynamicPages = getPersistenceBrokerTemplate().getCollectionByQuery(query);


            // cache dynamic pages in folder
            folderImpl.accessDynamicPages().clear();
            if (dynamicPages != null)

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        try
        {
            // query for fragment definition
            Criteria filter = new Criteria();
            filter.addEqualTo("parent", new Integer(folderImpl.getIdentity()));
            QueryByCriteria query = QueryFactory.newQuery(FragmentDefinitionImpl.class, filter);
            Collection fragmentDefinitions = getPersistenceBrokerTemplate().getCollectionByQuery(query);


            // cache fragment definition in folder
            folderImpl.accessFragmentDefinitions().clear();
            if (fragmentDefinitions != null)

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