Examples of javax.persistence.EntityManager

javax.persistence.EntityManager
Interface used to interact with the persistence context. An EntityManager instance is associated with a persistence context. A persistence context is a set of entity instances in which for any persistent entity identity there is a unique entity instance. Within the persistence context, the entity instances and their lifecycle are managed. This interface defines the methods that are used to interact with the persistence context. The EntityManager API is used to create and remove persistent entity instances, to find entities by their primary key, and to query over entities. The set of entities that can be managed by a given EntityManager instance is defined by a persistence unit. A persistence unit defines the set of all classes that are related or grouped by the application, and which must be colocated in their mapping to a single database. @author Emmanuel Bernard

    }


    @Factory(value = "wikiStart", scope = ScopeType.CONVERSATION, autoCreate = true)
    public WikiDocument loadWikiStart() {
        log.debug("loading wiki start into current conversation");
        EntityManager em = (EntityManager)Component.getInstance("restrictedEntityManager");
        try {
            return (WikiDocument) em
                    .createQuery("select d from WikiDocument d where d.id = :id")
                    .setParameter("id", Preferences.instance().get(WikiPreferences.class).getDefaultDocumentId())
                    .setHint("org.hibernate.comment", "Loading wikiStart")
                    .setHint("org.hibernate.cacheable", false)
                    .getSingleResult();

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    // Loads the same instance into a different persistence context
    @Factory(value = "restrictedWikiRoot", scope = ScopeType.PAGE, autoCreate = true)
    public WikiDirectory loadWikiRootRestricted() {
        log.debug("loading wiki root into restricted PC");
        EntityManager em = (EntityManager)Component.getInstance("restrictedEntityManager");
        WikiDirectory wikiroot = (WikiDirectory) Component.getInstance("wikiRoot");
        try {
            return (WikiDirectory) em
                    .createQuery("select d from WikiDirectory d left join fetch d.feed where d.id = :id")
                    .setParameter("id", wikiroot.getId())
                    .setHint("org.hibernate.comment", "Loading wikiRootRestricted")
                    .setHint("org.hibernate.cacheable", false)
                    .getSingleResult();

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    }


    @Factory(value = "memberArea", scope = ScopeType.PAGE, autoCreate = true)
    public WikiDirectory loadMemberArea() {
        log.debug("loading member area");
        EntityManager em = (EntityManager)Component.getInstance("entityManager");
        String memberAreaName = Preferences.instance().get(WikiPreferences.class).getMemberArea();
        try {
            return (WikiDirectory) em
                    .createQuery("select d from WikiDirectory d left join fetch d.feed where d.wikiname = :name and d.parent.parent is null")
                    .setParameter("name", WikiUtil.convertToWikiName(memberAreaName) )
                    .setHint("org.hibernate.comment", "Loading memberArea")
                    .setHint("org.hibernate.cacheable", false)
                    .getSingleResult();

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    }


    @Factory(value = "trashArea", scope = ScopeType.PAGE, autoCreate = true)
    public WikiDirectory loadTrashArea() {
        log.debug("loading trash area");
        EntityManager em = (EntityManager)Component.getInstance("entityManager");
        String trashAreaName = Preferences.instance().get(WikiPreferences.class).getTrashArea();
        try {
            return (WikiDirectory) em
                    .createQuery("select d from WikiDirectory d left join fetch d.feed where d.wikiname = :name and d.parent.parent is null")
                    .setParameter("name", WikiUtil.convertToWikiName(trashAreaName) )
                    .setHint("org.hibernate.comment", "Loading trashArea")
                    .setHint("org.hibernate.cacheable", false)
                    .getSingleResult();

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        }.run();


        new FacesRequest() {


            protected void invokeApplication() throws Exception {
                EntityManager em = (EntityManager) getInstance("restrictedEntityManager");


                WikiDocument d = (WikiDocument)
                        em.createQuery("select d from WikiDocument d left join fetch d.incomingLinks where d.id = :id")
                                .setParameter("id", 7l)
                                .getSingleResult();
                assert d.getIncomingLinks().size() == 1;
                em.clear();


                d = (WikiDocument)
                        em.createQuery("select d from WikiDocument d left join fetch d.incomingLinks where d.id = :id")
                                .setParameter("id", 8l)
                                .getSingleResult();
                assert d.getIncomingLinks().size() == 2;
                em.clear();


                WikiUpload f = (WikiUpload)
                        em.createQuery("select f from WikiUpload f left join fetch f.incomingLinks where f.id = :id")
                                .setParameter("id", 30l)
                                .getSingleResult();
                assert f.getIncomingLinks().size() == 1;
            }
        }.run();

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    @Test
    public void documentURL() throws Exception {
        new FacesRequest() {


            protected void invokeApplication() throws Exception {
                EntityManager em = (EntityManager) getInstance("restrictedEntityManager");
                WikiDocument d = (WikiDocument)
                        em.createQuery("select d from WikiDocument d where d.id = :id")
                                .setParameter("id", 6l)
                                .getSingleResult();


                assert d.getPermURL(".lace").equals("6.lace");
                assert d.getWikiURL().equals("CCC/One");

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         InitialContext ctx = new InitialContext();
         
         t = (UserTransaction) ctx.lookup("UserTransaction");
         t.begin();
      
         EntityManager em = (EntityManager) Component.getInstance("entityManager", true);
         
         List<Auction> auctions = em.createQuery("from Auction").getResultList();
         
         Calendar cal = new GregorianCalendar();
         
         Random r = new Random(System.currentTimeMillis());
         
         for (Auction auction : auctions)
         {
            cal.setTime(auction.getEndDate());
            cal.add(Calendar.DATE, r.nextInt(7));
            cal.add(Calendar.MINUTE, 30 + r.nextInt(1410));
            auction.setEndDate(cal.getTime());
            em.merge(auction);
            
            AuctionEndAction auctionEnd = (AuctionEndAction) Component.getInstance(AuctionEndAction.class, true);
            auctionEnd.endAuction(auction.getAuctionId(), auction.getEndDate());
         }

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{
   
   public Object getAsObject(FacesContext context, UIComponent component, String value)
   {
      
      EntityManager entityManager = (EntityManager) Component.getInstance("entityManager");
      
      if (value != null)
      {
         try
         {
            Integer id = Integer.parseInt(value);
            if (id != null)
            {
               return entityManager.find(Film.class, id);
            }
         }
         catch (NumberFormatException e)
         {
         }

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    }


    @Factory(value = "helpArea", scope = ScopeType.PAGE, autoCreate = true)
    public WikiDirectory loadHelpArea() {
        log.debug("loading help area");
        EntityManager em = (EntityManager)Component.getInstance("entityManager");
        String helpAreaName = Preferences.instance().get(WikiPreferences.class).getHelpArea();
        try {
            return (WikiDirectory) em
                    .createQuery("select d from WikiDirectory d left join fetch d.feed where d.wikiname = :name and d.parent.parent is null")
                    .setParameter("name", WikiUtil.convertToWikiName(helpAreaName) )
                    .setHint("org.hibernate.comment", "Loading trashArea")
                    .setHint("org.hibernate.cacheable", false)
                    .getSingleResult();

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    }


    @Factory(value = "linkProtocolMap", scope = ScopeType.CONVERSATION, autoCreate = true)
    public Map<String, LinkProtocol> loadLinkProtocols() {
        log.debug("loading link protocol map");
        EntityManager em = (EntityManager)Component.getInstance("entityManager");
        Map<String, LinkProtocol> linkProtocols = new TreeMap<String, LinkProtocol>();
        //noinspection unchecked
        List<Object[]> result = em
                .createQuery("select lp.prefix, lp from LinkProtocol lp order by lp.prefix asc")
                .setHint("org.hibernate.comment", "Loading link protocols")
                .setHint("org.hibernate.cacheable", true)
                .getResultList();
        for (Object[] objects : result) {

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