solr 空间搜索

   现在的移动开发中，越来越多的app都有周边搜索功能。本文介绍怎么用solr来实现周边搜索。

   首先构建一个常见的业务场景：搜索10KM以内的店铺信息，并且可以根据距离远近来排序。

   一、配置schema.xml

<?xml version="1.0" ?>
<schema name="master" version="1.5">
  <types>
   <fieldtype name="string"  class="solr.StrField" sortMissingLast="true" omitNorms="true"/>
   <fieldtype name="location" class="solr.LatLonType" subFieldSuffix="_coordinate"/>
   <fieldType name="long" class="solr.TrieLongField" precisionStep="0" omitNorms="true" positionIncrementGap="0"/>
   <fieldType name="int" class="solr.TrieIntField" precisionStep="0" omitNorms="true" positionIncrementGap="0" /> 
   <fieldType name="double" class="solr.TrieDoubleField" precisionStep="0" omitNorms="true" positionIncrementGap="0"/>
  </types>

 <fields>
    <field name="id" type="string" indexed="true" stored="true" required="true" multiValued="false" />
    <field name="name" type="string" indexed="true" stored="true" multiValued="false" />
    <field name="url" type="string" indexed="true" stored="true" multiValued="false" />
    <field name="businesshours" type="string" indexed="true" stored="true" multiValued="false" />
    <field name="provinceCode" type="string" indexed="true" stored="true" multiValued="false" />
    <field name="cityCode" type="string" indexed="true" stored="true" multiValued="false" />
    <field name="storeAddress" type="string" indexed="true" stored="true" multiValued="false" />
    <field name="geography" type="location" indexed="true" stored="true" multiValued="false" />
    <field name="storeIntrodced" type="string" indexed="true" stored="true" multiValued="false" />
    <field name="businessLicense" type="string" indexed="true" stored="true" multiValued="false" />
    <field name="telephone" type="string" indexed="true" stored="true" multiValued="false" />
    
    <dynamicField name="*_coordinate" type="double" indexed="true" stored="true" />
    
    <field name="_version_" type="long" indexed="true" stored="true"/>
</fields>
 <uniqueKey>id</uniqueKey>
 <defaultSearchField>name</defaultSearchField>
 <solrQueryParser defaultOperator="OR"/>
</schema>

二、添加地理位置数据

      数据格式为：（纬度,经度）

<field name="geography">30.904995063319802,120.65201489254832</field>

index.setGeography("30.904995063319802,120.65201489254832");

三、查询

solrQuery.addField("dist:geodist(geography,30.904995,120.652015)");
solrQuery.set("fq", "{!geofilt}");
solrQuery.set("pt", "30.904995,120.652015"); 
solrQuery.set("sfield", "geography"); 
solrQuery.set("d", "10");

// 按距离排序
solrQuery.addSortField("geodist()", ORDER.desc);