java - 如何使用 spring-data-solr 在空间搜索中返回距离和分数

Question

我正在使用 spring-data-solr 1.0.0.RELEASE 以及 Solr 4.4.0 和 Spring 3.2.4.RELEASE 编写基于 Spring MVC 的搜索 API。

我能够运行基本查询但无法找到任何好的示例如何在结果中返回分数和距离:geodist()。

我知道我可以使用类似

的查询从 Solr 获得结果

http://localhost:8983/solr/events/select?q=*:*&spatial=true&pt=51.435872%2C-0.427529&sfield=position&d=20&facet=true&facet.mincount=1&facet.limit=-1&facet.field=categoryIds&fl=score,*,distance:geodist()&sort=geodist()+asc

但我不知道如何使用 spring-data-solr 获取从 Solr 返回的分数和距离属性。我试过下面的代码

FacetQuery search = new SimpleFacetQuery();

Criteria conditions;// = new Criteria();
if(StringUtils.isNotBlank(searchCriteria.getSearchString()))
        conditions = new Criteria(EventDocument.FIELD_EVENT).contains(searchCriteria.getSearchString());

if(searchCriteria.isLocationKnown()){
        conditions.and(new Criteria(EventDocument.FIELD_POSITION).within(new GeoLocation(searchCriteria.getLatitude(), searchCriteria.getLongitude()), new Distance(searchCriteria.getDistance(), Distance.Unit.MILES)));
        conditions.and(new Criteria(CommonParams.FL).is("score,distance:geodist(),*"));
    } else{
        conditions.and(new Criteria(CommonParams.FL).is("score,*"));
    }

search.addCriteria(conditions);
FacetPage page = solrTemplate.queryForFacetPage(search, EventDocument.class);

但出现以下异常:

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.springframework.data.solr.UncategorizedSolrException: undefined field fl; nested exception is org.apache.solr.client.solrj.impl.HttpSolrServer$RemoteSolrException: undefined field fl
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:948)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:827)
javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:812)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
root cause

org.springframework.data.solr.UncategorizedSolrException: undefined field fl; nested exception is org.apache.solr.client.solrj.impl.HttpSolrServer$RemoteSolrException: undefined field fl
org.springframework.data.solr.core.SolrTemplate.execute(SolrTemplate.java:122)
org.springframework.data.solr.core.SolrTemplate.executeSolrQuery(SolrTemplate.java:330)
org.springframework.data.solr.core.SolrTemplate.query(SolrTemplate.java:326)
org.springframework.data.solr.core.SolrTemplate.queryForFacetPage(SolrTemplate.java:285)
com.johnstonpress.api.repository.EventDocumentRepositoryImpl.search(EventDocumentRepositoryImpl.java:72)
com.johnstonpress.api.service.SearchEventServiceImpl.search(SearchEventServiceImpl.java:106)
com.johnstonpress.api.controller.EventsSearchController.searchEvents(EventsSearchController.java:124)
com.johnstonpress.api.controller.EventsSearchController.search(EventsSearchController.java:68)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:601)
org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:219)
org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:745)
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:686)
org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:925)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:936)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:827)
javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:812)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)

感谢您的关注和帮助!!!

Answer 1

要设置 fl，您必须使用 query.addProjectionOnField(String fieldname)。

    SimpleQuery query = new SimpleQuery(conditions);
    query.addProjectionOnField("*");
    query.addProjectionOnField("score");

要将 score 映射到 EventDocument 中，您必须按如下方式添加属性。

    @Indexed(value = "score", readonly = true)
    private Float score;

不幸的是，geodist() 似乎存在问题，这可能是由 spring data solr 创建空间查询的方式引起的。已开通DATASOLR-130为了那个原因。

---

可以使用 SolrCallback 和 SolrTemplate 自行设置空间参数来请求距离。

    SimpleQuery query = new SimpleQuery(conditions);
    query.addProjectionOnField("*");
    query.addProjectionOnField("distance:geodist()");

    DefaultQueryParser qp = new DefaultQueryParser();
    final SolrQuery solrQuery = qp.constructSolrQuery(query);
    solrQuery.add("sfield", "store");
    solrQuery.add("pt", GeoConverters.GeoLocationToStringConverter.INSTANCE.convert(new GeoLocation(45.15, -93.85)));
    solrQuery.add("d", GeoConverters.DistanceToStringConverter.INSTANCE.convert(new Distance(5)));

    List<EventDocument> result = template.execute(new SolrCallback<List<EventDocument>>() {

      @Override
      public List<EventDocument> doInSolr(SolrServer solrServer) throws SolrServerException, IOException {
        return template.getConverter().read(solrServer.query(solrQuery).getResults(), EventDocument.class);
      }
    });

为 geodist() 提供所需的参数会更容易一些。

    SimpleQuery query = new SimpleQuery(conditions);
    query.addProjectionOnField("*");
    query.addProjectionOnField("distance:geodist(store," + GeoConverters.GeoLocationToStringConverter.INSTANCE.convert(new GeoLocation(45.15, -93.85)) + ")");
    Page<EventDocument> result = template.queryForPage(query, EventDocument.class);

希望对您有所帮助!