如何獲得冬眠搜索方面

我下面講的小面休眠搜索文檔相關對象：我有https://docs.jboss.org/hibernate/stable/search/reference/en-US/html_single/#query-faceting 如何獲得冬眠搜索方面

我是能夠產生我的面，例如我authorNames +計數：

name1 = 100 
name2 = 200 
and so on..

但我的問題是如何查詢作者對象，如果我想顯示它的一些其他細節。

由例如我現在去：

FullTextEntityManager fullTextEntityManager = Search.getFullTextEntityManager(em); 
QueryBuilder qb = fullTextEntityManager.getSearchFactory().buildQueryBuilder().forEntity(Book.class).get(); 

org.apache.lucene.search.Query luceneQuery = qb.all().createQuery(); 
FullTextQuery fullTextQuery = fullTextEntityManager.createFullTextQuery(luceneQuery, Book.class); 

FacetingRequest authorFacet = qb.facet().name("authorFacetRequest").onField("authors.name_facet").discrete() 
     .orderedBy(FacetSortOrder.FIELD_VALUE).includeZeroCounts(false).createFacetingRequest(); 

// retrieve facet manager and apply faceting request 
FacetManager facetManager = fullTextQuery.getFacetManager(); 
facetManager.enableFaceting(authorFacet); 

// retrieve the faceting results 
List<Facet> facets = facetManager.getFacets("authorFacetRequest"); 
facets.forEach(p -> log.info(p.getValue() + " - " + p.getCount()));

但我想創建一個ID = author.id鏈接的GUI。但是author.id不能使用facet。所以我想要的是：

List<facetName (authorName), count, referenceId>

什麼是最簡單和有效的方式來實現呢？有沒有辦法做到這一點沒有多個查詢？

來源

2017-10-13 czetsuya

您可以定位作者標識符而不是作者姓名。

寫一個類來保存結果：

public class EntityFacet<T> implements Facet { 
    private final Facet delegate; 
    private final T entity; 
    public EntityFacet(Facet delegate, T entity) { 
    // ... 
    } 

    // delegate all Facet methods to the delegate 

    public T getEntity() { 
    return entity; 
    } 
}

添加一個字段和方面筆者ID：

@Indexed 
@Entity 
public class Author { 

    @Id 
    // Discrete faceting only works on text fields, so we don't use the default bridge 
    @Field(name = "id_for_facet", analyze = Analyze.NO, bridge = @Bridge(impl = org.hibernate.search.bridge.builtin.IntegerBridge)) 
    @Facet(name = "id_facet", forField = "id_for_facet") 
    private Integer id; 

    // ... 
}

（如果你在Book已經制定任何限制你的@IndexedEmbedded類，如includePaths，請確保將它們更新爲包含此新面）

如果您只需要名稱和ID，則您c在兩個方面做兩個查詢並且完成它。

如果您需要更多的信息，然後更改您的代碼爲目標的ID方面：

FullTextEntityManager fullTextEntityManager = Search.getFullTextEntityManager(em); 
QueryBuilder qb = fullTextEntityManager.getSearchFactory().buildQueryBuilder().forEntity(Book.class).get(); 

org.apache.lucene.search.Query luceneQuery = qb.all().createQuery(); 
FullTextQuery fullTextQuery = fullTextEntityManager.createFullTextQuery(luceneQuery, Book.class); 

FacetingRequest authorFacet = qb.facet().name("authorFacetRequest").onField("authors.id_facet").discrete() 
     .includeZeroCounts(false).createFacetingRequest(); 

// retrieve facet manager and apply faceting request 
FacetManager facetManager = fullTextQuery.getFacetManager(); 
facetManager.enableFaceting(authorFacet); 

// retrieve the faceting results 
List<Facet> facets = facetManager.getFacets("authorFacetRequest");

最後，做一些後期處理：

List<Integer> authorIds = facets.map(f -> { 
      try { 
      return Integer.parseInt(f.getValue()); 
      } 
      catch (NumberFormatException e) { 
      throw new RuntimeException("Unexpected author ID format", e); 
      } 
     }) 
     .collect(Collectors.asList()); 
List<Author> authors = fullTextEntityManager.unwrap(Session.class) 
    .byId(Author.class) 
    .multiLoad(authorIds); 
List<EntityFacet<Author>> entityFacets = new ArrayList<>(facets.size()); 
for (int i = 0; i < facets.size()) { 
    entityFacets.add(new EntityFacet(facets.get(i), authors.get(i))); 
} 
Collator nameSort = new Collator(); 
nameSort.setStrength(Collator.PRIMARY); 
Collections.sort(entityFacets, Comparator.comparing(f -> f.getEntity().getName(), nameSort)); 
entityFacets.forEach(p -> log.info(p.getEntity() + " - " + p.getCount()));

我沒有試運行代碼，但這應該是，給出或帶來一些語法錯誤。

當然，它有點太複雜了，尤其是ID解析的東西。但是我認爲在我們改進分面之前，你可以做得更好（這應該發生在搜索6中）。

來源

2017-10-13 07:06:04

如何獲得冬眠搜索方面

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