Question

再一次...... 我有2个表'博客'和'评论'。博客可以包含n条评论（博客--1：n--评论）。到目前为止，我使用以下select将数据插入到solr索引中：

    <entity name="blog" dataSource="mssqlDatasource" pk="id"
        transformer="ClobTransformer"
        query="SELECT b.id, b.market, b.title AS blogTitle, b.message AS            
                blogMessage, c.message AS commentMessage, c.secondColumn 
                FROM blog b LEFT JOIN comment c ON b.id = c.source_id
                AND c.source_type = 'blog'">
        <field column="blogMessage" name="blogMessage" clob="true" />
        <field column="commentMessage" name="commentMessage" clob="true" />
    </entity>

索引结果如下：

    <doc>
     <str name="id">1</str>
     <str name="market">12</str>
     <str name="title">blog of title 1</str>
     <str name="blogMessage">message of blog 1</str>
     <str name="commentMessage">message of comment</str>
     <str name="scondColumn">Im the second column from comment</str>
    </doc>

    <doc>
     <str name="id">1</str>
     <str name="market">12</str>
     <str name="title">blog of title 1</str>
     <str name="blogMessage">message of blog 1</str>
     <str name="commentMessage">message of comment - Im the second comment</str>
     <str name="scondColumn">Im the second column from comment</str>       
    </doc>

我会说这是愚蠢的，因为我在同一博客上获得的索引数据太多，只是评论不同。是否可以将“评论”设置为“子实体”，如下所示：

    <entity name="blog" dataSource="mssqlDatasource" pk="id"
        transformer="ClobTransformer"
        query="SELECT b.id, b.market, b.title AS blogTitle, b.message AS            
                blogMessage
                FROM blog b">
         <field column="blogMessage" name="blogMessage" clob="true" />

          <entity name="comment" dataSource="mssqlDatasource" pk="id"
             transformer="ClobTransformer"
             query="SELECT c.message as commentMessage, c.secondColumn
                FROM comment c
                WHERE c.source_id = ${blog.id}">
            <field column="commentMessage" name="commentMessage" clob="true" />              
          </entity>
    </entity>

这可能吗？结果如何（直到星期一才能测试）？

Answer 1

您几乎就在那里，如果您想为每个博客文档填写多值评论字段，您需要CachedSqlEntityProcessor

我的看起来很像这样（我没有留下clob变压器位，但你显然需要它们）

<entity name="blog" 
        query="SELECT b.id, 
                      b.market, 
                      b.title AS blogTitle, 
                      b.message AS            
               blogMessage
               FROM blog b">
    <entity name="blog_comment" 
            query="SELECT c.message as commentMessage, 
                          c.secondColumn,
                          c.blog_id
            FROM comment c" 
     processor="CachedSqlEntityProcessor"  
     where="blog_id=blog.id"/>    
<entity>

文档应该如下：

<doc>
   <str name="id">1</str>
   <str name="market">12</str>
   <str name="title">blog of title 1</str>
   <str name="blogMessage">message of blog 1</str>
   <arr name="commentMessage">
       <str>message of comment</str>
       <str>message of comment - Im the second comment</str>
   </arr>
   <arr name="secondColumn">
       <str>Im the second column from comment</str>
       <str>Im the second column from comment</str>
   </arr>
</doc>

如果要避免重复值，可能需要执行多个嵌套实体，一个查询每个列。

Solr - 具有多个值的嵌套实体

1 个答案: