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jaquemet
 Post subject: Criteria query with collection of values (Set<String>)
PostPosted: Wed Feb 04, 2009 10:20 am 
Newbie

Joined: Wed Feb 04, 2009 9:13 am
Posts: 4
Hello all,

I am quite new with Hibernate, I have really tried to look for information on the following issue in documentation and books, but I could not find any definitive information regarding this... So if any of you could help, it would really be appreciated !

Problem: I cannot manage to perform a criteria based query on a simple collection (Set<String>)

Hibernate version: 3.2.6.ga
Database version: MySQL 5.0.67

I have this simple (simplified for the forum of course) Member class :
Code:
public class Member {
  private Long rowId;
  private Set<String> gids = new HashSet<String>();
 
  public Long getRowId() { return rowId; }
  public void setRowId(Long rowId) { this.rowId = rowId; }

  public Set<String> getGids() {
    return gids;
  }

  public void setGids(Set<String> gids) {
    this.gids = gids;
  }
}


and its hbm file
Code:
  <class name="org.company.project.Member" table="MEMBER">

      <id name="rowId" column="rowId">
        <generator class="native"/>
      </id>

      <set name="gids" table="MEMBER_GIDS">
        <key column="rowId"/>
        <element type="string" column="gid" length="64" not-null="true"/>
      </set>

  </class>


My first attempts following example of the book "Java Persistence with Hibernate" were as follows :

Test 1 :
Code:
List<Member> mbrList = session.createCriteria(Member.class)
                               .add(Restrictions.eq("gids.gid", "1234"));


Throws an exception :
Code:
org.hibernate.QueryException: could not resolve property: gids.gid of: com.jalios.jcms.dbmember.DBMember
   at org.hibernate.persister.entity.AbstractPropertyMapping.propertyException(AbstractPropertyMapping.java:44)


which is quite normal since gids is not a Set of hibernate entity, just a simple Set of String...

Test 2 :
Code:
List<Member> mbrList = session.createCriteria(Member.class)
                               .createCriteria("gids").add(Restrictions.eq("gid", "1234"))


throws this exception :

Code:
org.hibernate.MappingException: collection was not an association: com.jalios.jcms.dbmember.DBMember.gids
   at org.hibernate.type.CollectionType.getAssociatedEntityName(CollectionType.java:447)


indicating that the collection is not an association, but I could not add a <one-to-many> relationship in the hbm for a set of String...


I have found these two posts which I think are related to my question, but they seem to indicate this is not possible... :


Could someone please tell me if this is possible with Hibernate, and if so, help me find the appropriate configuration/querycode to use ?
If this is not possible, what workaround can i use ?

Thanks for your help !
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jaquemet
 Post subject:
PostPosted: Mon Feb 16, 2009 4:38 am 
Newbie

Joined: Wed Feb 04, 2009 9:13 am
Posts: 4
Does anybody have an idea on this ?

I could understand if collections of String were not supported for Criteria query, but a definitive answer would be nice...
Also maybe it should be added to the documentation...
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becay
 Post subject:
PostPosted: Mon Mar 16, 2009 6:27 am 
Newbie

Joined: Mon Jul 02, 2007 6:16 am
Posts: 3
Hi jaquemet,

did you find a solution/answer for this question?

thanks
Becay
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jaquemet
 Post subject:
PostPosted: Mon Mar 16, 2009 1:37 pm 
Newbie

Joined: Wed Feb 04, 2009 9:13 am
Posts: 4
Hi Becay,

After some research, we found there is no solution using the simple Criteria API.
Its a known limitation in Hibernate :
http://opensource.atlassian.com/project ... se/HHH-869
I highly suggest you to vote for this improvement !

You can workaround this problem using SQL restrictions (provided you know your fields and table name).
Code:
Restrictions.sqlRestriction(String sql, ...)

http://www.hibernate.org/hib_docs/v3/ap ... tions.html

I don't have the code available right now, I can give you an example later if you want.


Olivier
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ferrylauda
 Post subject: Re: Criteria query with collection of values (Set<String>)
PostPosted: Mon Oct 19, 2009 4:52 pm 
Newbie

Joined: Mon Oct 19, 2009 4:47 pm
Posts: 2
Hi Jaquemet,

do you still have the solution for this problem? Can i take a look at the code?

thanks,
ferry
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jaquemet
 Post subject: Re: Criteria query with collection of values (Set<String>)
PostPosted: Tue Oct 20, 2009 3:19 am 
Newbie

Joined: Wed Feb 04, 2009 9:13 am
Posts: 4
ferrylauda wrote:
do you still have the solution for this problem? Can i take a look at the code?


Hi Ferry, I'm sorry but I did not kept the code which uses Restrictions.sqlRestriction.

If I use the sample example above, it is probably something like this :
Code:
    crit.add(Restrictions.sqlRestriction("INNER JOIN MEMBER MEMBER_GIDS on MEMBER.gids = MEMBER_GIDS.rowId WHERE MEMBER_GIDS.gid= '1234';"));


Warning : I don't remember the real working solution, and I have not tested the code just above !
This is just a guess looking back at some of my previous notes.

Good luck.
Olivier
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ferrylauda
 Post subject: Re: Criteria query with collection of values (Set<String>)
PostPosted: Tue Oct 20, 2009 5:57 pm 
Newbie

Joined: Mon Oct 19, 2009 4:47 pm
Posts: 2
Hi Olivier,

Thanks for your help, i'll try it.

ferry
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jr_arzuaga
 Post subject: Re: Criteria query with collection of values (Set<String>)
PostPosted: Fri Jun 10, 2011 5:24 pm 
Newbie

Joined: Thu Jan 07, 2010 4:31 pm
Posts: 2
Did you solve this with the workaround above? Can you post the working workaround?
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