Hibernate getResultList（）为计数查询返回重复项

Question

I am running a count query using Java 1.6 and Hibernate version 3.2.1 that I expect to return a resultList containing [2]. I am instead getting a result list containing [2, 2, 2, 2]. I turned on debugging to see the hibernate queries allowing me to see the same query being run four times.

The ejbql on the Query I'm running getResultList() on:

SELECT COUNT(*)FROM FlightLogItemEntity AS sectorItem  WHERE UPPER(sectorItem.sectorId) = :literal0 AND UPPER(sectorItem.logType) = :literal1

{literal0=0001006711, literal1=TL}

After running getResultList() only once, I see in my logs four identical queries being run:

[SQL] select count(*) as col_0_0_ from SECTOR_ITEM techlogite0_ where upper(techlogite0_.SECTOR_ID)=? and upper(techlogite0_.LOG_TYPE)=? 
[StringType] binding '0001006711' to parameter: 1 
[StringType] binding 'TL' to parameter: 2 
[LongType] returning '2' as column: col_0_0_ 
[SQL] select count(*) as col_0_0_ from SECTOR_ITEM flightlogi0_ where upper(flightlogi0_.SECTOR_ID)=? and upper(flightlogi0_.LOG_TYPE)=? 
[StringType] binding '0001006711' to parameter: 1 
[StringType] binding 'TL' to parameter: 2 
[LongType] returning '2' as column: col_0_0_ 
[SQL] select count(*) as col_0_0_ from SECTOR_ITEM flightlogi0_ where upper(flightlogi0_.SECTOR_ID)=? and upper(flightlogi0_.LOG_TYPE)=? 
[StringType] binding '0001006711' to parameter: 1 
[StringType] binding 'TL' to parameter: 2 
[LongType] returning '2' as column: col_0_0_ 
[SQL] select count(*) as col_0_0_ from SECTOR_ITEM cabinlogit0_ where upper(cabinlogit0_.SECTOR_ID)=? and upper(cabinlogit0_.LOG_TYPE)=? 
[StringType] binding '0001006711' to parameter: 1 
[StringType] binding 'TL' to parameter: 2 
[LongType] returning '2' as column: col_0_0_ 

At first I thought it might have to do with Entity relationships causing multiple queries to run, but after removing all relationships I still see the same duplicate queries being run.

The code generating the query (after setting the entityManager, ejbql, and Literals):

query.setFirstResult(-1);
query.setFlushMode(null);
query.setMaxResults(-1);
List<?> resultList = query.getResultList();

Does anyone know how I might prevent duplicate queries being run (to prevent duplicate results)?

Answer 1

I'm not sure why its doing the query 4 times, but when you use query.setMaxResults(-1); you're setting it to return however many items it gets. http://docs.jboss.org/hibernate/orm/3.6/javadocs/org/hibernate/Query.html#setMaxResults(int)

Try changing query.setMaxResults(-1); to query.setMaxResults(1); This may just be a band-aid but it should allow you get just one result.