休眠搜索子实体

Question

我将三个类定义为：

1)类别类：-

@Entity
@Table(name = "CATEGORY")
@Data
@NoArgsConstructor
@AllArgsConstructor
@Indexed
public class Category {

@Id
@GeneratedValue
private Long id;

@Field(index = Index.YES, store = Store.YES, analyzer = @Analyzer(definition = "ngram"))
private String categoryName;

@OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY)
@JoinColumn(name = "categoryId", referencedColumnName = "id")
@LazyCollection(LazyCollectionOption.TRUE)
@IndexedEmbedded
private List<SubCategory> subCategories;

private Long creationTime;

private Long updationTime;
}

2) SubCategory 类：-

 @Entity
 @Table(name = "SUB_CATEGORY")
 @Data
 @NoArgsConstructor
 @AllArgsConstructor
 @Indexed
 public class SubCategory {


@Id
@GeneratedValue
private Long id;

@Field(index = Index.YES,store = Store.YES,analyzer = @Analyzer(definition = "ngram1"))
private String subCategoryName;

@Field(index = Index.YES,store = Store.YES)
private Long categoryId;

@OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY)
@JoinColumn(name = "subCategoryId", referencedColumnName = "id")
@LazyCollection(LazyCollectionOption.TRUE)
@IndexedEmbedded
private List<Pages> pages;

private Long creationTime;
}

3) 页面类：-

 @Entity
 @Table(name = "PAGES")
@Data
@NoArgsConstructor
@AllArgsConstructor
@Indexed
public class Pages {

@Id
@GeneratedValue
private Long id;

@Field(index = Index.YES,store = Store.YES,analyzer = @Analyzer(definition = "ngram2"))
private String pageName;

@Field(index = Index.YES,store = Store.YES,analyzer = @Analyzer(definition = "ngram2"))
private String pageDescription;

@Field(index = Index.YES,store = Store.YES,analyzer = @Analyzer(definition = "ngram2"))
private Long subCategoryId;

private Long creationTime;
}

现在数据定义如下：-

   Category              SubCategory              Pages
   --------              ------------             -------
   Vehicle                Car                     BMW
   Electricals            MotorCycle              Hero
   ...........            ........                Audi
   ...........            ........                ...... 
   Lapzz                  Laptop                  ......
                                                  Dell

现在我被困在获取将使用休眠搜索在所有三个类中搜索的查询（即 - 如果我搜索 Lap*）我应该从类别、子类别和页面中获取结果，并且只有与查询匹配的行不是Category 的完整对象。

例如，当我搜索 Lap* 时，我应该在结果集中获得类别中包含 Lapzz 的行和子类别中包含笔记本电脑的行。 请帮我找到这个解决方案。

Answer 1

据我所知，这应该做你想做的事：

String searchTerms = ...;

QueryBuilder categoryQb = fullTextEntityManager.getSearchFactory().buildQueryBuilder().forEntity( Category.class ).get();
QueryBuilder subCategoryQb = fullTextEntityManager.getSearchFactory().buildQueryBuilder().forEntity( SubCategory.class ).get();
QueryBuilder pagesQb = fullTextEntityManager.getSearchFactory().buildQueryBuilder().forEntity( Pages.class ).get();

Query categoryQuery = categoryQb.keyword()
    .onField( "categoryName" )
    .matching( searchTerms )
    .createQuery();
Query subCategoryQuery = subCategoryQb.keyword()
    .onField( "subCategoryName" )
    .matching( searchTerms )
    .createQuery();
Query pagesQuery = pagesQb.keyword()
    .onFields(
        "pageName",
        "pageDescription"
    )
    .matching( searchTerms )
    .createQuery();

Query luceneQuery = categoryQb.bool()
        .should( categoryQuery )
        .should( subCategoryQuery )
        .should( pagesQuery )
        .createQuery();

FullTextQuery fullTextQuery = fullTextEntityManager.createFullTextQuery(
    luceneQuery,
    Category.class, SubCategory.class, Pages.class
);

List<?> results = fullTextQuery.getResultList();

这里有几个警告是必要的：

• 由于您使用的是ngram过滤器，查询时可能需要使用不同的分析器；见this answer
• Pages.subcategoryId 上的 @Field 注释非常可疑：分析数值没有意义。就此而言，将另一个实体的 ID 存储在 Pages 中是可疑的，您通常希望拥有一个类型为 SubCategory 的字段，并使用 @ManyToOne 对其进行注释。
• 如果您希望查询匹配描述中没有搜索词但包含名称或描述中包含搜索词的页面的类别，则必须添加 IndexedEmbedded 并添加嵌入的字段（"pages.pageName"、"pages.pageDescription"、...）添加到您的搜索查询中。