create barcode image c# Sorting results using field types and score Sort by title and for equal titles by EAN in Java

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Listing 6.21 Sorting results using field types and score Sort by title and for equal titles by EAN
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case TITLE_THEN_SCORE: {
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SortField[] sortFields = new SortField[2]; sortFields[0] = new SortField( "title_sort", SortField.STRING ) sortFields[1] = SortField.FIELD_SCORE; sort = new Sort( sortFields ); break; }
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B SortField holds two constants, FIELD_SCORE and FIELD_DOC, that can be used to
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sort respectively by score and document id. If you want to know more about sorting in Lucene, we highly recommend Lucene in Action, published by Manning. This book has a comprehensive and dedicated section on the subject. The Sort Javadoc is of great help as well. You now have the knowledge required to retrieve the objects you want, sorted in the order of your choice, but we haven t yet described what part of the object graph is loaded and how.
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Overriding fetching strategy
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By default, Hibernate Search uses the standard fetching strategy defined in your mapping. Associations won t be loaded when they re marked as lazy. When an association is marked as eager, the fetching strategy defined in your mapping is used (join, subselect, select). In some cases, your application code will want to navigate through associations marked as lazy in an efficient manner.
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You can override the fetching strategy used to load objects from the persistence context in a full-text query. This is critical for avoiding both of the following:
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LazyInitializationException; for example, during the rendering view
Any performance issue; for example, facing the famous n+1 problem
If you know the application needs to navigate through a certain object path, it s more efficient to load the graph up front. You define the fetching strategy in Hibernate Search by passing to the FullTextQuery object a Hibernate Core Criteria query (see listing 6.22).
Listing 6.22 Use a Criteria query to define the fetching strategy.
public List<String> displayItemAndDistributorByMatchingTitle(String words) { org.apache.lucene.search.Query luceneQuery = buildLuceneQuery( words, Item.class ); FullTextSession ftSession = SessionHolder.getFullTextSession(); FullTextQuery query = ftSession.createFullTextQuery( luceneQuery, Item.class );
Set fetching targeted entity Criteria fetchingStrategy = profile ftSession.createCriteria( Item.class ) .setFetchMode( "distributor", FetchMode.JOIN ); query.setCriteriaQuery( fetchingStrategy );
@SuppressWarnings("unchecked") List<Item> items = query.list();
Create criteria on
Set criteria on full-text query
List<String> results = new ArrayList<String>(); for (Item item : items) { StringBuilder itemInString = new StringBuilder( "Item " ) .append( "(" ).append( item.getEan() ).append( ")" ) .append( " " ).append( item.getTitle() ) .append( " - " ).append( item.getDistributor().getName() ); Use preloaded results.add( itemInString.toString() ); associations } return results;
B The Criteria query must be based on the same entity type used to filter the full-text query. C Fetching strategies can be overridden, but no restriction should be added to the Criteria query. D The Criteria query is passed to the FullTextQuery object and
will be used to load objects (instead of the regular fetch strategy based on the static mapping). E Access to distributor does not trigger a second query because it has been loaded previously. Only a subset of the Criteria API capabilities is available. Be sure to target a single entity type in createFullTextQuery when overriding the fetching strategy through a Criteria API. The Criteria query must target this entity type and not apply any restrictions; only fetching operators are allowed. FulltextQuery.setCriteriaQuery is available when using the Java Persistence APIs of Hibernate Search, but be aware that
Querying with Hibernate Search
Criteria is still a pure Hibernate Core API and requires a Session object to be built. You can access the Session object underneath a Hibernate EntityManager instance by using the getDelegate() method: Session session = (Session) entityManager.getDelegate();. When Java Persistence supports a Criteria-like API, Hiber-
nate Search will likely migrate to it.
WARNING Be sure to use the same entity type for both the Criteria instance and
the full-text query targeted entity. Hibernate Search raises an exception otherwise. Some people are tempted to use additional restrictions on the Criteria query injected into a Hibernate Search query. After all, it would mean restricting the query further by some additional SQL clauses on top of the Lucene restrictions. This approach has two major problems: Pagination is no longer respected, and the total number of results is incorrect. Pagination is applied to the Lucene query before loading any object and does not take into account that objects will be filtered out by the Criteria/SQL restriction. After pagination is applied, if an object cannot be loaded for a given document (because it cannot be found by the loading query), it is ignored and not returned in the results. The list of results seen through pagination is like a gigantic piece of Gruyere: It has lots of holes, making it practically unusable. Likewise, the total number of results is built from the total number of matching Lucene documents and cannot account for the SQL-based filtering. Some Lucene results will puzzle you. Fortunately, there are ways to understand what s going on.
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