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https://issues.apache.org/jira/browse/SOLR-1612?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12785352#action_12785352
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Matt Inger commented on SOLR-1612:
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Any thoughts on how to handle the class loading issue though when constructing
the transformer itself? The way I'm getting around it right now is to run SOLR
first, and then find the exploded webapp, and copy my jar into the WEB-INF/lib
directory of the exploded webapp.
> Use java.sql.Array to populate Multivalue field in DataImportHandler
> --------------------------------------------------------------------
>
> Key: SOLR-1612
> URL: https://issues.apache.org/jira/browse/SOLR-1612
> Project: Solr
> Issue Type: Improvement
> Components: contrib - DataImportHandler
> Affects Versions: 1.4
> Reporter: Matt Inger
> Fix For: 1.5
>
> Attachments: SOLR-1612.patch
>
>
> I am attaching a patch to the JdbcDataSource class which allows the it to
> populate a multiValued field from a query which returns a java.sql.Array type
> for a column value.
> In order to make this work, you need to do the following:
> 1. In your schema.xml file, set the "multiValued" attribute to the value
> "true"
> <field name=foo" type="string" ... multiValued="true" />
> 2. Have your sql query return a sql type of java.sql.Types.ARRAY. How to do
> this is very database dependent, but in oracle, you first create a type:
> create or replace type FOO_TYPE IS TABLE OF VARCHAR2(255);
> and then when you select the values, you have to use MULTISET and cast
> to the created type (assuming here that FOO_PARENT_ID is the condition to
> limit which foos belong to the current record):
> CAST(MULTISET(SELECT FOO FROM FOOS WHERE
> FOO_PARENT=FOO_PARENT_ID) AS FOO_TYPE ) MY_FOOS
> The main advantage this has is it can save you a ton of queries over the
> current method which will fire off an individual query for each document in
> order to retrieve the values for each multiValued field. This method
> executes much faster, and saves alot of database resources.
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