Michael Ray Gentry created CAY-2641:
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Summary: 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
Fix For: Undefined future
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.
* Update commit code to omit lazy attributes from UPDATEs.
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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