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 Post subject: Require Hibernate Performance resolution on collections
PostPosted: Thu Jun 02, 2016 5:05 pm 
Newbie

Joined: Thu Jun 02, 2016 4:51 pm
Posts: 3
We are facing performance issue when we are adding participants related appointment and saving them. The reason I found is because
when the mapped child 'Appointment' method 'getParticipant()' is called when the mapped parent 'Participant' entity having 'getAppointment()' is invoked, creating multiple joins query, which inturn fetches unwanted recordset.

Now I do not want my parent 'Participant' method 'getAppointment()' to get called, which resolves the issue, which I could test by commenting it out.

Is there a way I give any annotation which saves me commenting method, which is a bad practice I know. There are other similar examples in the code which cannot be commented, since they are used in code. Below are the Two Entity classes having the mapped methods:

Participants {
@ManyToMany(cascade = {CascadeType.PERSIST, CascadeType.MERGE, CascadeType.REMOVE}, mappedBy = "participants",
targetEntity = com.skeds.core.domain.Appointment.class, fetch = FetchType.LAZY)
@Audited(withModifiedFlag=true)
public Set<Appointment> getAppointments() {
return appointments;
}
..
..
}

Appointments {
@ManyToMany(targetEntity = com.skeds.core.domain.Participant.class, cascade = { CascadeType.PERSIST, CascadeType.MERGE,
CascadeType.REFRESH, CascadeType.REMOVE }, fetch = FetchType.LAZY)
@Filter(name = "ACTIVE", condition = "ACTIVE=1")
@JoinTable(name = "APPOINTMENTS_HAVE_PARTICIPANTS", joinColumns = @JoinColumn(name = "APPOINTMENT_ID"), inverseJoinColumns = @JoinColumn(name = "PARTICIPANT_ID"))
@Audited(withModifiedFlag=true)
public Set<Participant> getParticipants() {
return participants;
}
..
..
}

Can someone help here. Thanks in advance.


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 Post subject: Re: Require Hibernate Performance resolution on collections
PostPosted: Fri Jun 03, 2016 10:01 am 
Newbie

Joined: Thu Jun 02, 2016 4:51 pm
Posts: 3
Just FYI I tried 'LazyCollectionOption.EXTRA' but it did not work for me.


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 Post subject: Re: Require Hibernate Performance resolution on collections
PostPosted: Sat Jun 04, 2016 1:58 am 
Hibernate Team
Hibernate Team

Joined: Thu Sep 11, 2014 2:50 am
Posts: 1630
Location: Romania
I suggest you remove @ManyToMany associations which don't perform very well, and replace them with two bidirectional one-to-many associations.


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 Post subject: Re: Require Hibernate Performance resolution on collections
PostPosted: Mon Jun 06, 2016 11:56 am 
Newbie

Joined: Thu Jun 02, 2016 4:51 pm
Posts: 3
Thanks for the reply. This will help me lot if I could implement.

I do not have an association class in between for bi directional set up. Are you referring the bi directional between the same two classes. Would that not demand duplicate methods performing same thing in the same class, although mapped differently, each with parent, and child behaviours.

Can you sketch a rough code example. Would appreciate thanks,


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 Post subject: Re: Require Hibernate Performance resolution on collections
PostPosted: Tue Jun 07, 2016 2:19 am 
Hibernate Team
Hibernate Team

Joined: Thu Sep 11, 2014 2:50 am
Posts: 1630
Location: Romania
You can use this example from the reference documentation.


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