2d barcode vb.net Mapping a persistent POJO using an hbm.xml file in Java

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Listing 2.7 Mapping a persistent POJO using an hbm.xml file
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package com.manning.hsia.dvdstore.model; @Indexed public class Item { @DocumentId private Integer id;
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No Java Persistence annotations are present
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@Field private String title; @Field private String description; @Field(index=Index.UN_TOKENIZED, store=Store.YES) private String ean; private String imageURL; //public getters and setters }
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<hibernate-mapping package="com.manning.hsia.dvdstore.model"> <class name="Item"> Mapping externalized <id name="id"> in hbm.xml files <generator class="native"/> </id> <property name="title"/> <property name="description"/> <property name="ean"/> <property name="imageURL"/> </class> </hibernate-mapping>
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It s currently not possible to express the Hibernate Search metadata using an XML descriptor, but it might be added to a future version of the product, depending on user demand.
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Getting started with Hibernate Search
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Indexing your data
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We ve just shown how the object model will be mapped into the index model, but we haven t addressed when the object model is indexed. Hibernate Search listens to Hibernate Core operations. Every time an entity marked for indexing is persisted, updated, or deleted, Hibernate Search is notified. In other words, every time you persist your domain model to the database, Hibernate Search knows it and can apply the same changes to the index. The index stays synchronized with the database state automatically and transparently for the application. That s good news for us because we don t have anything special to do! What about existing data Data already in the database may never be updated, and so Hibernate Search will then never be able to receive a notification from Hibernate Core. Because in most scenarios the index needs to be initially populated with existing and legacy data, Hibernate Search proposes a manual indexing API. This is our first look at the Hibernate Search API. Hibernate Search extends the Hibernate Core main API to provide access to some of the full-text capabilities. A FullTextSession is a subinterface of Session. Similarly, a FullTextEntityManager is a subinterface of EntityManager (see figure 2.1). Those two subinterfaces Figure 2.1 FullTextSession and contain the same methods and especially FullTextEntityManager extend Session the one interesting us at the moment: the and EntityManager, respectively. ability to manually index an object. Where can we get an instance of theses interfaces Internally, the FullTextEntityManager and FullTextSession implementations are wrappers around an EntityManager implementation or a Session implementation. Hibernate Search provides a helper class (org.hibernate.search.jpa.Search) to retrieve a FullTextEntityManager from a Hibernate EntityManager as well as a helper class to retrieve a FullTextSession from a Session (org.hibernate.search.Search). Listing 2.8 shows how to use these helper classes.
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Listing 2.8 Retrieving a FullTextSession or a FullTextEntityManager
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Session session = ...; FullTextSession fts = org.hibernate.search.Search.getFullTextSession(session);
EntityManager em = ...; FullTextEntityManager ftem = org.hibernate.search.jpa.Search.getFullTextEntityManager(em);
Wrap a Session object
Wrap an EntityManager object
Querying your data
NOTE
getFullTextSession and getFullTextEntityManager were named createFullTextSession and createFullTextEntityManager in Hibernate
Search 3.0. The two full-text APIs have a method named index whose responsibility is to index or reindex an already persistent object. Let s see in listing 2.9 how we would index all the existing items.
Listing 2.9 Manually indexing object instances
FullTextEntityManager ftem = Search.getFullTextEntityManager(em); ftem.getTransaction().begin(); @SuppressWarnings("unchecked") List<Item> items = em.createQuery("select i from Item i").getResultList(); for (Item item : items) { ftem.index(item); } ftem.getTransaction().commit();
Manually index an item instance Index is written at commit time
In this piece of code, items is the list of Item objects to index. You ll discover in section 5.4.2 a more efficient solution to massively indexing data, but this one will be good enough for now. The index method takes an item instance and indexes it. The Lucene index will thus contain the necessary information to execute full-text queries matching these items. The initial dataset indexed, subsequent changes, and whether it is item creation, item update, or item deletion will be taken care of by the Hibernate event system. The index and the database stay synchronized. We now have an up-to-date index ready to be queried, which leads to the next question: How do I query data using Hibernate Search
Querying your data
Hibernate Search tries to achieve two somewhat contradictory goals:
Provide a seamless integration with the Hibernate Core API and programmatic model Give the full power and flexibility of Lucene, the underlying full-text engine
To achieve the first goal, Hibernate Search s query facility integrates into the Hibernate query API (or the Java Persistence query API if you use the EntityManager). If you know Hibernate Core, the query-manipulation APIs will look very familiar to you; they re the same! The second key point is that Hibernate Search returns Hibernate managed objects out of the persistence context; in more concrete terms it means that the objects retrieved from a full-text query are the same object instances you would have retrieved from an HQL query (had HQL the same full-text capabilities). In particular, you can update those objects, and Hibernate will synchronize any changes to the
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