JPA 2.1

• JPA 2.1 Overview

• JPA Entity Graphs : Hibernate Fetch Profiles 같은 것.
• JPA Entity Graphs

• How to define named queries at runtime with JPA 2.1

• Criteria Update/Delete - The easy way to implement bulk operations in JPA 2.1

• JPQL Enhancements in JPA 2.1 and Java EE 7 (part 1 – JOIN ON)

• How to call custom database functions with JPA and Hibernate
• Hibernate 를 구현체로 사용시에 항상 dialect 에 해당 function이 등록돼 있어야 한다.

public class MyPostgreSQL9Dialect extends PostgreSQL94Dialect {
 
	public MyPostgreSQL9Dialect() {
		super();
		registerFunction("calculate", new StandardSQLFunction("calculate"));
	}
}

Author a = em.createQuery("SELECT a FROM Author a WHERE a.id = function('calculate', 1, 2)", Author.class).getSingleResult();