Use java.sql.Array to populate Multivalue field in DataImportHandler
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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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