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Difference between revisions of "Dali Project/specs/3.0/2.0ElementCollection"
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'''Element Collection Embeddable Type Details''' | '''Element Collection Embeddable Type Details''' |
Revision as of 12:12, 14 December 2009
Functional Specification: Dali Support for JPA 2.0 Element Collection mapping
bug 258490 - element collection support
Document History
Date | Author | Version Description & Notes |
---|---|---|
12-9-2009 | Karen Butzke | Draft |
Project overview
This feature covers the element collection mapping in the JPA 2.0 spec as well as any EclipseLink extensions.
Goals:
- Add Generic 2.0 support for Element Collection
- Add EclipseLink 3.0 support for Element Collection with relevant extensions
- Provide the appropriate defaults and validation for these settings
Concepts
Present any concepts relevant to the feature.
EclipseLink Element Collection Functional Spec
Requirements / Functionality
Element Collection with Basic Type
- Target Class - defaults to type of the Collection if it is generic
- Fetch - defaults to Lazy
- Collection Table
- Name defaults to <Entity name>_<attribute name>
- Column
- Name default to attribute name
- Table defaults to collection table name and is not editable
Element Collection Basic Type Details
Ordering Section
Element Collection with Embeddable Type
- Attribute and Association override names are derived from the Embeddable type
Element Collection Embeddable Type Details
Element Collection Map with Basic Key and Basic Value Details
Optimistic Locking
- @OptimisticLocking annotation supported in Entity and MappedSuperclass classes. Corresponding eclipselink-orm.xml element is optimistic-locking
- Type Options
- Default (Version Column)
- All Columns -> OptimisticLockingType.ALL_COLUMNS
- Changed Columns -> OptimisticLockingType.CHANGED_COLUMNS
- Selected Columns -> OptimisticLockingType.SELECTED_COLUMNS
- Version Column -> OptimisticLockingType.VERSION_COLUMN
- Validation
- Type is 'Selected Columns' but no columns are selected
- Selected Columns must be mapped and must not be primary keys
- If using Optimistic Locking with anything other than Version Column, the @Version annotation will be ignored (warning, not error, for this)
- If 'cascade' is set and type is not 'Version Column', warning that it is not supported.
- If type is 'Version Column' or @OptimisticLocking is specified without a type, there must be a mapping marked @Version.
- If no @Version annotation exists the Default option will display 'Default (None)
- If a Version annotation exists, the default option will display 'Default (Version Column)
For Reference, Locking tab from MW
API
Issues
This section lists the open issues that are still pending that must be decided prior to fully implementing this project's requirements.
Issue # | Owner | Description / Notes | Decision |
---|---|---|---|
Future Considerations
During the research for this project the following items were identified as out of scope but are captured here as potential future enhancements. If agreed upon during the review process these should be logged in the bug system.