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Getting started with Hibernate Search
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default Lucene field name of a property, it s considered a bad practice and will make querying more unnatural, as you ll see in the query section of this chapter. imageURL, which is not marked by @Field, won t be indexed in the Lucene document even if Hibernate stores it in the database.
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An object instance mapped by Hibernate roughly corresponds to a table row in the database. An object property is roughly materialized to a table column. To make the same analogy in the Lucene index, an object instance mapped by Hibernate roughly corresponds to a Lucene document, and an object property is roughly materialized to a Lucene field in the document. Now take this analogy with a grain of salt because this oneto-one correspondence isn t always verified. We ll come to these more exotic cases later in this book.
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The ean property is indexed slightly differently than the others. While we still use @Field to map it, two new attributes have been defined. The first one, index, specifies how the property value should be indexed. While we have decided to chunk title and description into individual words to be able to search these fields by word (this process is called tokenization), the ean property should be treated differently. EAN, which stands for European Article Number, is the article bar code that you can see on just about any product sold nowadays. EAN is a superset of the UPC (Universal Product Code) used in North America. It would be fairly bad for the indexing process to tokenize a unique identifier because it would be impossible to search by it. That s why the index attribute is set to Index.UN_TOKENIZED; the EAN value won t be chunked during the indexing process. The second particularity of the ean property is that its value will be stored in the Lucene index. By default, Hibernate Search doesn t store values in the index because they re not needed in most cases. As a result, the Lucene index is smaller and faster. In some situations, though, you want to store some properties in the Lucene index, either because the index is read outside of Hibernate Search or because you want to execute a particular type of query projection that we ll talk about later in the book. By adding the store attribute to Store.YES in the @Field annotation, you ask Hibernate Search to store the property value in the Lucene index. The example shows annotations placed on fields. This isn t mandatory; you can place annotations on getters as well. If the annotation is on the getter, Hibernate Search will access the property value through the getter method. Indeed, this is the authors preferred access strategy. To keep the example as short and readable as possible, this book will show annotations only on fields.
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SHOULD I USE GETTER OR FIELD ACCESS There s no performance impact in using one or the other, nor is there any advantage with regard to Hibernate Search. Choosing is more a matter of architectural taste. The authors tend to prefer getter access because it allows an abstraction over the object state. Also, the Java Persistence specification requires accessing data through getters for maximum portability. In any case, consistency is
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Mapping the domain model
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the rule you should follow. Try to use the same access strategy for both Hibernate Core and Hibernate Search, because it will save you from some unwanted surprises. We ll now show how to use Hibernate Search on an existing XML-based mapping structure (hbm.xml files).
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What if I don t use Hibernate Annotations
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The previous example shows the use of Hibernate Search in conjunction with Hibernate Annotations, but the same example would work perfectly with hbm.xml files as well. This is particularly useful if you try to use Hibernate Search on an existing Hibernate Core based application where the mapping is defined in XML. Have a look at listing 2.7.
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