我正在使用Spring-Data-Elastic-Search进行搜索/缓存。 我需要执行一个使用child(TermCache)和parent(ConceptCache)属性的查询 并返回子对象的实例(这意味着我不能使用嵌套对象)。
我有以下结构:
@Document(indexName = "termweb" , type = "term")
public class TermCache {
@Id
private String id;
private String name;
private LanguageDTO language;
private String status;
private String definition;
@Field(type = FieldType.String, store = true)
@Parent(type = "concept")
private Long conceptId;
private String displayId;
private Map<Long, String> fields = new HashMap<>();
//todo think about storing it as a collection of nested objects
}
@Document( indexName = "termweb" , type = "concept")
public class ConceptCache implements ConceptDTO{
@Id
private String id;
private String displayId;
private Long dictionaryId;
private String dictionaryName;
private Map<Long, String> fields = new HashMap<>();
}
我需要提示如何处理这类任务;我应该使用两个单独的查询,还是应该以某种方式获取父项的属性或者其他什么?
答案 0 :(得分:8)
同意,我们缺乏文档,我们将在即将发布的版本中进行改进。
如果您对弹簧数据有任何疑问,弹性搜索stackoverflow可能不是获得答案的最佳方式(因为我们不会收到新线程的通知),我们会为问题/查询提供单独的Google小组https://groups.google.com/forum/#!forum/spring-data-elasticsearch-devs
我不知道你想要用上面的实体实现什么,我可以给你一个样本父子实体的例子,如下所示
@Document(indexName = "parent-child", type = "parent-entity")
public class ParentEntity {
@Id
private String id;
@Field(type = FieldType.String, index = FieldIndex.analyzed, store = true)
private String name;
// setter/getter
public ParentEntity() {
}
public ParentEntity(String id, String name) {
this.id = id;
this.name = name;
}
}
@Document(indexName = "parent-child", type = "child-entity")
public class ChildEntity {
@Id
private String id;
@Field(type = FieldType.String, store = true)
@Parent(type = "parent-entity")
private String parentId;
@Field(type = FieldType.String, index = FieldIndex.analyzed, store = true)
private String name;
public ChildEntity() {
}
public ChildEntity(String id, String parentId, String name) {
this.id = id;
this.parentId = parentId;
this.name = name;
}
}
//索引父级(您可以使用许多其他方式来索引,包括使用存储库)
ParentEntity parent1 = new ParentEntity("parent1", "First Parent");
IndexQuery parentIndex1 = new IndexQuery();
parentIndex1.setId(parent1.getId());
parentIndex1.setObject(parent1);
elasticsearchTemplate.index(parentIndex1);
ParentEntity parent2 = new ParentEntity("parent2", "Second Parent");
IndexQuery parentIndex2 = new IndexQuery();
parentIndex2.setId(parent2.getId());
parentIndex2.setObject(parent2);
elasticsearchTemplate.index(parentIndex2);
//索引子
ChildEntity child1 = new ChildEntity("child1", parent1.getId(), "First");
IndexQuery childIndex1 = new IndexQuery();
childIndex1.setId(child1.getId());
childIndex1.setObject(child1);
childIndex1.setParentId(child1.getParentId());
elasticsearchTemplate.index(childIndex1);
ChildEntity child2 = new ChildEntity("child2", parent1.getId(), "Second");
IndexQuery childIndex2 = new IndexQuery();
childIndex2.setId(child2.getId());
childIndex2.setObject(child2);
childIndex2.setParentId(child2.getParentId());
elasticsearchTemplate.index(childIndex2);
//搜索
在父/子实体上搜索时有几个可用选项,其中包括has children,has parent和top children个查询。
QueryBuilder query = topChildrenQuery("child-entity", QueryBuilders.termQuery("name", child1name.toLowerCase()));
SearchQuery searchQuery = new NativeSearchQueryBuilder().withQuery(query).build();
List<ParentEntity> parents = elasticsearchTemplate.queryForList(searchQuery, ParentEntity.class);
希望这个小例子能让您基本了解如何使用父子。请查看ParentChildTests了解更多内容。
如果您还有其他问题,请随时与我们联系。
答案 1 :(得分:0)
您应该只使用过滤器的hasparent查询:http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/query-dsl-has-parent-filter.html#query-dsl-has-parent-filter
这将在父字段上发出请求,并生成匹配父文档的子文档。然后,您可以对返回的子文档使用过滤器:)