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https://issues.apache.org/jira/browse/CAY-2641?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Nikita Timofeev closed CAY-2641.
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Resolution: Fixed
> Add Lazy Attributes
> -------------------
>
> Key: CAY-2641
> URL: https://issues.apache.org/jira/browse/CAY-2641
> Project: Cayenne
> Issue Type: Improvement
> Components: Core Library, Documentation, Modeler, ROP, Website
> Affects Versions: Undefined future
> Reporter: Michael Ray Gentry
> Assignee: Nikita Timofeev
> Priority: Minor
> Fix For: 4.2.M2
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> Add the ability to mark an attribute as lazy. Such attributes will be
> excluded from the original SELECT query and subsequently calling the lazy
> attribute's getter (and perhaps the setter?) will trigger a fault to the DB
> to retrieve the actually contents. This will be useful for BLOB type data
> that you might want to exclude during a normal fetch of metadata (file name,
> size, etc) in tables where which include both.
> Initial thoughts:
> * Update Cayenne Modeler to have a "Lazy" column in the Object Attribute
> editor which is a checkbox (like the Optimistic Locking toggle).
> * Update the XML format to support a lazy="true" or lazy="false" (the
> default) attribute to the obj-attribute tag.
> * Update CayenneDataObject to handle lazy attribute faults. Will likely
> need some new support classes.
> * Update Velocity templates to generate correct code for lazy attributes.
> * Update query code to omit lazy attributes from SELECTs and create fault
> objects for them.
> * Update commit code to omit lazy attributes from UPDATEs (ones that haven't
> been faulted in yet, even if used for Optimistic Locking).
> I'm sure there are other things I'm missing, plus need to handle ROP, which
> I'm not familiar with using.
>
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