在结果中返回函数值

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假设你有一个服务, ugg outlet france 你的用户可以搜索不同的公司,用户输入一个简单的关键字,可以返回匹配关键字的公司,但是有一天,用户要求返回的公司列表中可以显示公司跟用户的距离, timberland pas cher 这是该怎么做呢? 准备工作 在开始之前,需要先了解字段别名功能, Bottes UGG Pas Cher France 具体可以参看这里 怎么做 1.假设我们在 schema.xml 中定义了如下索引结构:

 <field name="id" type="string" indexed="true" stored="true" required="true" multiValued="false" /> <field name="name" type="text" indexed="true" stored="true"/> <field name="loc" type="location" indexed="true" stored="true"/> <dynamicField name="*_coordinate" type="double" indexed="true" stored="false" /> 

2.我们需要定义 location 字段类型,如下所示:

 <fieldType name="location" class="solr.LatLonType" subFieldSuffix="_coordinate"/> 

3.再假设我们有以下索引数据

 <add> <doc> <field name="id">1</field> <field name="name">Company 1</field> <field name="loc">56.4,40.2</field> </doc> <doc> <field name="id">2</field> <field name="name">Company 2</field> <field name="loc">50.1,48.9</field> </doc> <doc> <field name="id">3</field> <field name="name">Company 3</field> <field name="loc">23.18,39.1</field> </doc> </add> 

4.现在可以通过以下语句查询到名称中匹配 company 的公司

q=name:company&fl=*

5.假设我们已经获得了客户端位置是 50.0, ugg soldes 28.0,然后我们打算在公司结果列表中显示客户端跟这些公司的距离。这时我们需要将以下参数加载 fl 中:

dist:geodist(loc,50.0,28.0)

这样整个查询看起来像这样:

q=name:company&fl=*,dist:geodist(loc,50.0,28.0)

查询返回的内容如下所示:

 <?xml version="1.0" encoding="UTF-8"?> <response> <lst name="responseHeader"> <int name="status">0</int> <int name="QTime">0</int> <lst name="params"> <str name="q">name:company</str> <str name="fl">*,dist:geodist(loc,50.0,28.0)</str> </lst> </lst> <result name="response" numFound="3" start="0"> <doc> <str name="id">1</str> <str name="name">Company 1</str> <str name="loc">56.4,40.2</str> <double name="dist">1077.4200268973314</double> </doc> <doc> <str name="id">2</str> <str name="name">Company 2</str> <str name="loc">50.1,48.9</str> <double name="dist">1487.4260767512278</double> </doc> Chapter 4 153 <doc> <str name="id">3</str> <str name="name">Company 3</str> <str name="loc">23.18,39.1</str> <double name="dist">3134.746384852772</double> </doc> </result> </response> 

上面结果中 dist 就是客户要的距离字段。

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