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Java Persistence 2.0
Java Persistence 2.0
Java Persistence 2.0
Java Persistence 2.0
Java Persistence 2.0
Java Persistence 2.0
Java Persistence 2.0
Java Persistence 2.0
Java Persistence 2.0
Java Persistence 2.0
Java Persistence 2.0
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Java Persistence 2.0

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An overview of Java Persistence 2.0, from the Expert Group Lead

An overview of Java Persistence 2.0, from the Expert Group Lead

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  • 1. Java Persistence 2.0 Linda DeMichiel Java Persistence 2.0 Specification Lead Sun Microsystems
  • 2. Java Persistence 1.0 • Standardized O/R Mapping for Java EE and Java SE environments • A great start ..... 2
  • 3. Java Persistence 2.0 • Expanded O/R mapping functionality • Expanded query language to match • Criteria API • Pessimistic locking • Standardized hints and properties • Support for validation • And...some needed cleanups... 3
  • 4. Progress to Date: Early Draft • Expanded O/R mapping and modeling > Collections of basic types and embeddables > Relationships from embeddables > Multiple levels of embeddables > Persistent lists > Real maps and ternary relationships > Additional database schema mappings – one-to-many foreign key mappings for unidirectional relationships – one-to-one, many-to-one join table mappings > Real overlapping PK/FK modeling support – “derived identities” > Combinations of access types > Orphan deletion 4
  • 5. Progress to Date: Early Draft • Pessimistic locking > At both entity and query result levels • Standardized hints and properties > For locking > For configuration • Simple API for interaction with provider's cache 5
  • 6. Progress to Date: Public Review Draft • Java Persistence Query Language > Extensions for new mapping types > Support for non-polymorphic queries > Scalar expressions in SELECT list > Case statements > INDEX, KEY, VALUE, ENTRY operators for maps and lists > Collection-valued parameters for IN expressions > More flexibility in subqueries > ... 6
  • 7. Progress to Date: Public Review Draft • Criteria API > Dynamic, non-string-based API > Supports everything that JPQL queries can do > Integrates with existing Query API – Create query definitions – Pass them to createQuery to create Query objects 7
  • 8. Example: Criteria API ... QueryBuilder qb = EntityManager.getQueryBuilder(); DomainObject customer = qb.createQueryDefinition(Customer.class); DomainObject order = customer.join(“orders”); DomainObject address = customer.join(“address”); customer.where(address.get(“state”).equal(“CA”)) .select(order) .orderBy(order.get(“quantity”).desc(), order.get(“totalcost”)); 8
  • 9. Status and Roadmap • Public Review Draft > Submitted to JCP last week > Expected to appear in 1 - 2 weeks > http://jcp.org/en/jsr/detail?id=317 • Proposed Final Draft in December > Will target support for Validation (JSR 303) • Final Release in June > As part of Java EE 6 and as standalone Your feedback is important! > jsr-317-pdr-feedback@sun.com 9
  • 10. GlassFish and Java Persistence • Java Persistence 1.0 in GlassFish v3 Prelude today > EclipseLink 1.0 > Hibernate EntityManager > OpenJPA • Java Persistence 2.0 RI will be provided by EclipseLink project > Will be available in GlassFish v3 10
  • 11. Java Persistence 2.0 Linda DeMichiel Sun Microsystems

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