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EclipseLink/Development/JPA 2.0/query definition api

Query Definition API

JPA 2.0 Root | Enhancement Request

Issue Summary

JPA 2.0 specification has introduced a comprehensive object oriented query definition API which compliments JPQL.

This feature is covered in section 5 of the specification.

General Solution

Should be a simple translation to EclipseLink Queries and Expressions but will be work intensive. Some methods and interfaces can not be completed until the equivalent functionality has been added to EclipseLink

- see Entity Type Expressions
- see Collection Parameters for IN
- see CASE Expressions

Work Required

  1. Develop model for testing
    approx 4 day
  2. Update Processing
    approx 13 days - creating query definition implementation.

Extensions

  1. QueryBuilder.rebuildFrom(Root)
    reformulates expression from new root. Usefull for reusing expressions on new queries

== Restrictions ++

  1. Selection and Where must have at least one matching root to form query, otherwise illegal argument results

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