Hibernate 搜索子实体

Question

我有三个 classes 定义为：

1)类别class:-

@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) 子类别 class:-

 @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) 页数 class:-

 @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

现在我无法获取将使用休眠搜索在所有三个 class 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，并且只有仅匹配查询的行不是 Category 的完整对象。

例如，当我搜索 Lap* 时，我应该在结果集中得到类别中包含 Lapzz 的行和子类别中包含 Laptop 的行。请帮我找到这个解决方案。

Answer 1

据我了解，这应该可以满足您的要求：

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();

这里需要几个警告：

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；参见
您在 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，您通常希望有一个类型为 SubCategory 的字段，并用 @ManyToOne.[= 注释它28=]
如果您希望查询匹配描述中没有搜索词的类别，但包含名称或描述包含搜索词的页面，则必须添加 IndexedEmbedded并将嵌入字段（"pages.pageName"、"pages.pageDescription"、...）添加到您的搜索查询中。

Hibernate 搜索子实体

Hiberate search for child entities

orm

hibernate-mapping

hibernate-search

hibernate-query