I am trying to iterate over a result set of 2million records, for a large
bulk load and transformation into a new ODS. It appears that I am getting
an OutOfMemoryException because the DefaultResultSetHandler is caching the
object in the nestedResultObjects property. Is there some property I should
set or statement/ method call I should be using that will allow me to
process one line at a time and not have the nestedResultObjects store each
object?
My goal:
* Grab a row
* Send it to be processed
* Once processed, move on to the next row.
Note: Once a row is processed I no longer need a tie back to the object.
I have included the custom ResultHandler, the unit test and the
configuration file. Please let me know if you need other information.
package com.primetherapeutics.benplanmgr.entity.rxclaim;
import org.apache.ibatis.executor.result.ResultContext;
import org.apache.ibatis.executor.result.ResultHandler;
import org.apache.log4j.Logger;
/**
* @author kjarnold
*
*/
public class GroupEligibilityResultHandler implements ResultHandler {
Logger logger = Logger.getLogger(GroupEligibilityResultHandler.class);
int count = 0;
public void handleResult(ResultContext context) {
if(context.getResultObject() != null) {
count++;
logger.debug(count);
}
//context.stop();
}
public int getCount() {
return count;
}
}
@Test
public void getGroupElibibilitiesByResultHandler() {
Map<String, String> parameterMap = new HashMap<String,
String>();
parameterMap.put("gelThruDate", "1090101");
parameterMap.put("addDate", "1090911");
parameterMap.put("chgDate", "1090911");
parameterMap.put("planDate", "1090101");
try {
GroupEligibilityResultHandler handler = new
GroupEligibilityResultHandler();
session.select("com.primetherapeutics.benplanmgr.entity.rxclaim.data.GroupEligibilityMapper.getGroupEligibilities",
parameterMap, handler);
logger.debug(handler.getCount());
} finally {
session.close();
}
}
Here are my mapping files:
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration PUBLIC "-//ibatis.apache.org//DTD Config 3.0//EN"
"http://ibatis.apache.org/dtd/ibatis-3-config.dtd";>
<configuration>
<settings>
<setting name="multipleResultSetsEnabled" value="false"/>
<setting name="defaultExecutorType" value="BATCH"/>
</settings>
<mappers>
<mapper
resource="com/primetherapeutics/benplanmgr/entity/rxclaim/data/BenefitMaxSchedule.xml"/>
<mapper
resource="com/primetherapeutics/benplanmgr/entity/rxclaim/data/GroupEligibility.xml"/>
</mappers>
</configuration>
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