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https://issues.apache.org/jira/browse/SOLR-1612?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12785389#action_12785389
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Matt Inger commented on SOLR-1612:
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I have placed my .jar file in apache-solr-1.4.0/example/lib and am experience
the problem mentioned above. I'm guessing that for some reason the classloader
whcih loads the classes from the lib directory does not have the webapp's
classloader configured as it's parent classloader. As a result, when it looks
for the superclass of the custom transformer, it can't find the Transformer
abstract class.
> 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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