/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* License: GNU Lesser General Public License (LGPL), version 2.1 or later.
* See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
*/
package org.hibernate.test.annotations.entity;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;
import javax.persistence.UniqueConstraint;
import org.hibernate.annotations.NaturalId;
/**
* @author Guenther Demetz
*/
@Entity
@Table(uniqueConstraints = {@UniqueConstraint(columnNames={"year", "month"})})
// Remark: Without line above, hibernate creates the combined unique index as follows: unique (month, year)
// It seems that hibernate orders the attributes in alphabetic order
// We indeed want to have the inverted sequence: year, month
// In this way queries with only year in the where-clause can take advantage of this index
// N.B.: Usually a user defines a combined index beginning with the most discriminating property
public class Month {
@Id @GeneratedValue
private int id;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
@NaturalId
private int year;
@NaturalId
private int month;
}