DIH中添加不同的数据源

需求：从mysql数据库中读取一个知识记录，从记录表中的字段值中获取一个文件路径，读取xml文件，xml文件中可能包含多个文档内容。建立索引。

xml文件样例：

<?xml version="1.0" encoding="utf-8"?>
<docs>
    <data>
        <id>1</id>
        <title>测试数据</title>
        <content>测试内容</content>
        <crtime>2014-10-13 16:10:33</crtime>
        <templateid>201</templateid>
        <price>12.11</price>
    </data>
    <data>
        <id>2</id>
        <title>测试数据1</title>
        <content>测试内容1</content>
        <crtime>2014-10-12 16:10:33</crtime>
        <templateid>202</templateid>
        <price>20.11</price>
    </data>
</docs>

mysql数据格式样例：

CREATE TABLE `gx_kmsindex` (
  `id` BIGINT(20) NOT NULL AUTO_INCREMENT COMMENT '主键ID',
  `docid` BIGINT(20)  COMMENT '知识ID',
  `path` VARCHAR(200) DEFAULT NULL COMMENT '知识xml文件路径',
  `templateid` VARCHAR(20) NOT NULL COMMENT '知识模板id',
  `time` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '创建时间',
  `type` VARCHAR(20) NOT NULL COMMENT '知识操作类型，add/update/delete',
  PRIMARY KEY (`id`)
) ENGINE=INNODB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8

当为新增、更新知识时，docid可以为空，当为删除知识时，docid为必填项。

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处理方案：

1、schema.xml中配置field：

<field name="id" type="string" indexed="true" stored="true"  required="true"/>
<field name="_version_" type="long" indexed="true"  stored="true"/>
<field name="title" type="text_ik" indexed="true" stored="true"  termVectors="true"/>
<field name="content" type="text_ik" indexed="true" stored="true"  termVectors="true"/>

<field name="crtime" type="date"  indexed="true" stored="true" />
<field name="templateid" type="string" indexed="true" stored="true" />
<field name="price" type="double" indexed="true" stored="true" />

2、solrconfig.xml中配置handler：

<requestHandler name="/dataimport" class="org.apache.solr.handler.dataimport.DataImportHandler">
  <lst name="defaults">
      <str name="config">mysql-data-config.xml</str>
  </lst>
</requestHandler>

3、配置mysql-data-config.xml

<dataConfig>
    <dataSource name="jdbc" type="JdbcDataSource" driver="com.mysql.jdbc.Driver"
        batchSize="-1" url="jdbc:mysql://127.0.0.1:3306/test?characterEncoding=UTF-8"
        user="root" password="root" />
    <dataSource name="file" type="FileDataSource" encoding="utf-8" />
    <document>
        <entity name="kms" dataSource="jdbc"
            query="SELECT path  FROM gx_kmsindex ORDER BY TIME ASC" transformer="DateFormatTransformer">
            <entity dataSource="file" name="xml" url="${kms.path}"
                processor="XPathEntityProcessor" forEach="/docs/data/" transformer="DateFormatTransformer">
                <field column="id" xpath="/docs/data/id" />
                <field column="title" xpath="/docs/data/title" />
                <field column="content" xpath="/docs/data/content" />
                <field column="crtime" xpath="/docs/data/crtime"
                    dateTimeFormat="yyyy-MM-dd HH:mm:ss" />
                <field column="templateid" xpath="/docs/data/templateid" />
                <field column="price" xpath="/docs/data/price" />
            </entity>
        </entity>
    </document>
</dataConfig>

4、在后台建立索引，发现只抽取了一条数据记录。

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/Aif0bD2LBxyFvgJwz8zZxQokPc+Z4iS93deIBAMLo3wA5XL8BcsgbIOe8vL1RyBUY1ImfdzNWgo/D/VyAHPIGyCFvgBzyBsghb4Ac8gbIIW+AHPIGyCFvgJwD8mbN/ZEz3P4PvDquf7PGkDfgBXkD5JA3QA55A+SQN0AOeQPkkDdADnkD5PB5NyCH+7kAOeQNkEPeADnkDZBD3gA55A2QQ94AOeQNkEPeADnkDZCzMW/WaO7TAvba0b/xnERgJ/IGyNmTN55zD+yzZ7zEGs2zSYEd6N8AOVy/AXLIGyBne96smcgbsMuOz7sZKwF24n4uQA55A+T8B6u9QCmCBk0tAAAAAElFTkSuQmCC" alt="" />

按照道理，应该两条数据都能抽取。经过排查，是rootEntity属性的问题。在kms实体中，没有设置rootEntity属性，默认为true的。这样就把gx_kmsindex当作了根实体，

rootEntity="true" 表示它的文档会被Solr索引。如果rootEntity属性被显式地设置为false，那么DIH会反向查找，直到找到一个实体配置没有设置为false的。可以有子实体（sub-entities），它通常为每个父文档执行一次，并通常由父文档引用来缩小查找范围。子实体的文档会合并到根实体的文档中，如果多个子实体对相同的域产生了多个文档，那么根实体会产生一个多值域。

这里kms实体的rootEntity属性应该设置为“false”。xml实体才是用于索引的数据实体。所以xml实体rootEntity属性为true。这里采用默认属性值即可。修改后的mysql-data-config.xml：

<dataConfig>
<dataSource   name="jdbc" type="JdbcDataSource" driver="com.mysql.jdbc.Driver"    batchSize="-1"
    url="jdbc:mysql://127.0.0.1:3306/test?characterEncoding=UTF-8"    user="root" password="root"/>
<dataSource name="file" type="FileDataSource" encoding="utf-8" />
    <document>
        <entity name="kms" dataSource="jdbc" query="SELECT path  FROM gx_kmsindex ORDER BY TIME ASC"
            transformer="DateFormatTransformer" rootEntity="false">
            <entity  dataSource="file" name="xml" url="${kms.path}" processor="XPathEntityProcessor"
                 forEach="/docs/data/"   transformer="DateFormatTransformer" >
                <field column="id"     xpath="/docs/data/id"  />
                <field column="title" xpath="/docs/data/title"  />
                <field column="content" xpath="/docs/data/content"  />
                <field column="crtime" xpath="/docs/data/crtime"   dateTimeFormat="yyyy-MM-dd HH:mm:ss"/>
                <field column="templateid" xpath="/docs/data/templateid"   />
                <field column="price" xpath="/docs/data/price"  />
            </entity>
        </entity>
    </document>
</dataConfig>

5、修改后，重新建立索引：

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" alt="" />