Solr：通过db-data-config.xml查询索引子文档

Question

我试图将嵌套文档索引到父文档，但是没有在SOLR中找到索引数据的预期结构。请纠正我在solr配置中出现的问题，如下所述。

表格结构： enter image description here

1. db-data-config.xml

   <document>
   <entity name="parent" pk="parent_id" query="SELECT parent_id, name, salary, country from parent" deltaQuery="select parent_id, name, salary, country from parent where updated_at &gt ${dataimporter.last_index_time}">
   <field column="parent_id" name="id" />
   <field column="parent_id" name="parent_id" />
   <field column="name" name="name" />
   <field column="salary" name="salary" /> 
   <field column="country" name="country" />
   <entity name="child" child="true" pk="child_id" query="select child.child_id, child.parent_id, child.child_name from child where child.parent_id='${parent.parent_id}' ">
       <field column="parent_id" name="id"  /> 
       <field column="child_id" name="child_id"  />
       <field column="child_name" name="child_name"  />
   </entity>
   </entity>
   </document>
   

2. 管理型模式：

   <!-- parent table fields -->
   <field name="parent_d" type="text_general" indexed="true" stored="true"/>
   <field name="name" type="text_general" indexed="true" stored="true"/>
   <field name="salary" type="text_general" indexed="true" stored="true"/>
   <field name="country" type="text_general" indexed="true" stored="true"/>
   <!-- child table fields -->
   <field name="child_id" type="text_general" indexed="true" stored="true"/>
   <field name="child_name" type="text_general" indexed="true" stored="true"/>
   

3. 索引文档的结果不是嵌套的，它似乎是平面表示：

"response":{"numFound":4,"start":0,"docs":[ { "country":"IND", "parent_id":"1", "name":"p1", "salary":"11", "_version_":1582614969479856128 },
{ "id":"1", "child_id":"1", "child_name":"c1", "_version_":1582614969479856128 }, { "country":"USA", "parent_id":"2", "name":"p2", "salary":"222", "_version_":1582614969546964992 },
{ "id":"2", "child_id":"2", "child_name":"c2", "_version_":1582614969546964992 } ] }
预期：

"response":{"numFound":4,"start":0,"docs":[      
{
    "parent_id":"1",
    "country":"IND",
    "name":"p1",
    "salary":"11",
    "child":{
        "parent_id":"1",
        "child_id":"1",
        "child_name":"c1",
    },
    "_version_":1582614969479856128
    },      
    {
    "parent_id":"2",
    "country":"USA",
    "name":"p2",
    "salary":"222",
    "child":{
        "parent_id":"2",
        "child_id":"2",
        "child_name":"c2",
    },
    "_version_":1582614969546964992
    }
]
}

Answer 1

Solr也将子文档存储为独立文档，因此您看到的是正常的。但是有一些管道，所以你可以让它们与父母一起回来（并查询一层并获得另一层等）。

Yonik仔细阅读this post，了解如何查询以获得孩子等等。