[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-3425) @IndexColumn doesn't store the List index

@IndexColumn doesn't store the List index ----------------------------------------- Key: HHH-3425 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3425 Project: Hibernate3 Issue Type: Bug Components: core Affects Versions: 3.2.6 Environment: Hibernate: 3.2.6.ga, hibernate-annotations-3.3.0.GA, MySQL: 5.0.51b-community-nt Reporter: J Priority: Minor When you have a Parent class with a bidirectional one-to-many relation to a Child class (as a List), and the index column is mapped as a property in the associated entity, Hibernate will not store the index position of the List in the db. The value will stay 0 or null (depending whether you use int of Integer as index type). Example taken directly from 2.4.6.2.3: http://www.hibernate.org/hib_docs/annotations/reference/en/html/entity.ht... With small change, for example "order" is changed to "position", because "order" is not allowed as columnname in MySQL. ------------ PARENT -------------- package entities; import java.util.ArrayList; import java.util.List; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.Id; import javax.persistence.OneToMany; @Entity public class Parent { // Properties @Id @GeneratedValue private Long id; @OneToMany(mappedBy="parent") @org.hibernate.annotations.IndexColumn(name="position") private List<Child> children = new ArrayList<Child>(); private String name; // Getters & Setters public List<Child> getChildren() { return children; } public void setChildren(List<Child> children) { this.children = children; } public String getName() { return name; } public void setName(String name) { this.name = name; } public Parent() {} } ------------------ ----- CHILD ----- package entities; import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.Id; import javax.persistence.JoinColumn; import javax.persistence.ManyToOne; import org.hibernate.Session; import persistence.HibernateUtil; @Entity public class Child { // Properties @Id @GeneratedValue private Long id; @Column(name="position") private int position; @ManyToOne @JoinColumn(name="parent_id", nullable=false) private Parent parent; private String name; // Getters & Setters public Parent getParent() { return parent; } public void setParent(Parent parent) { this.parent = parent; } public String getName() { return name; } public void setName(String name) { this.name = name; } } ------------------------------------ ------ TEST -------------- Session session = HibernateUtil.getSessionFactory().getCurrentSession(); session.beginTransaction(); Parent parent = new Parent(); Child child1 = new Child(); parent.getChildren().add(child1); child1.setParent(parent); Child child2 = new Child(); parent.getChildren().add(child2); child2.setParent(parent); session.save(parent); session.save(child1); session.save(child2); session.getTransaction().commit(); -------------------------- After running this, the DB will stay: mysql> select * from child; +----+------+----------+-----------+ | id | name | position | parent_id | +----+------+----------+-----------+ | 1 | NULL | NULL | 1 | | 2 | NULL | NULL | 1 | +----+------+----------+-----------+ instead of: mysql> select * from child; +----+------+----------+-----------+ | id | name | position | parent_id | +----+------+----------+-----------+ | 1 | NULL | 1 | 1 | | 2 | NULL | 2 | 1 | +----+------+----------+-----------+ See also: http://forum.hibernate.org/viewtopic.php?p=2392563