[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-3414) fetch profiles
Kaizer (JIRA)
noreply at atlassian.com
Wed Mar 25 01:32:39 EDT 2009
[ http://opensource.atlassian.com/projects/hibernate/browse/HHH-3414?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=32704#action_32704 ]
Kaizer commented on HHH-3414:
-----------------------------
It might be a good idea to be able to extend a fetch profile so that one need not redefine the same fetch paths repeatedly. For eg.
<fetch-profile name="person-details">
<fetch path="Person.addresses" style="join"/>
</fetch-profile>
<fetch-profile name="person-education-details" extends="person-details">
<fetch path="Person.educationdetails" style="join"/>
</fetch-profile>
> fetch profiles
> --------------
>
> Key: HHH-3414
> URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3414
> Project: Hibernate Core
> Issue Type: New Feature
> Components: core, metamodel
> Reporter: Steve Ebersole
> Assignee: Steve Ebersole
> Fix For: 3.5
>
>
> The concept of fetch profiles as we are discussing here is basically to allow users to dynamically affect the mapped fetching strategy for associations at runtime.
> Consider the following example:
> <class name="Person">
> ...
> <set name="addresses" lazy="true" fetch="subselect" ...>
> ...
> </set>
> </class>
> <class name="Address">
> ...
> </class>
> This follows the normal recommendation to map associations as lazy and use a dynamic fetching strategy (ala HQL/Criteria) to modify this lazy behavior at runtime.
> The fetaure discussed here would allow the same behavior for loading as well:
> <hibernate-mapping>
> <fetch-profile name="person-details">
> <fetch path="Person.addresses" style="join"/>
> </fetch-profile>
> </hibernate-mapping>
> Or:
> <hibernate-mapping>
> <class name="Person">
> ...
> <fetch-profile name="person-details">
> <fetch path="addresses" style="join"/>
> </fetch-profile>
> <set name="addresses" lazy="true" fetch="subselect" ...>
> ...
> </set>
> </class>
> </hibernate-mapping>
> Now, doing:
> session.enableFetchProfile( "person-details" ).get( Person.class, 1 )...
> will load Person#1 as well as their addresses in a single joined query.
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