如何使用Spring Data Solr在空间搜索中返回距离和得分

  • Z时代
  • 2024-01-10
  • 分类：问答

我正在使用Spring-data-solr 1.0.0.RELEASE和Solr 4.4.0和Spring 3.2.4.RELEASE编写基于Spring

MVC的Search API。

我能够运行基本查询，但是找不到任何好的示例，如何在结果中返回score和distance：geodist（）。

我知道我可以使用类似的查询从Solr获取结果

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

但是我不知道如何使用spring-data-solr从Solr返回分数和距离属性。我尝试了以下代码

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);

但得到以下异常：

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)

回答：

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

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

为了映射score到其中，EventDocument您必须按如下所示添加属性。

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

不幸的是，似乎有一个问题geodist()可能是由Spring数据Solr创建空间查询的方式引起的。为此打开了DATASOLR-130。

距离可以使用要求SolrCallback沿着SolrTemplate自己设定的空间paramters。

    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);
      }
    });

稍微容易一点就是为提供所需的参数geodist()。

    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);

希望有帮助！

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