EclipseLink/Development/JPA 2.0/query definition api

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Contents

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