JPA - Mysql - GeneratedValue

Question

I am using Mysql with Eclipselink 2.0.1 and have the following situation:
My Entity is using a field declared like this:
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private long referenceNumber;
The DDL is generated and in my database all tables are created. If I insert a new record within my EJB I am getting as the "referenceNumber" not "1" - I am getting sometimes "50" sometimes "1232". It is a completely random id. Is it possible to get an ID which is starting by 1 and incrementing automatically ?
I have tried to use GenerationType.IDENTY but this has some problems with cascading operations, so I do not want to use it.

Answer 1

Hello,
I just started playing with JPA and mysql. My tables's primary keys use auto-increment option in database. To tell application how to work with these fields I use following statements and everything works perfect after some troubles in the beggining of course :-)) :
@Entity
@Table(name = "C_ADRESA_TYP") //, schema = "KMPV"
public class CiselnikAdresaTyp implements Serializable{
     private static final long serialVersionUID = 1L;
     @Id
     //@Required - cannot be used when using auto-increment and IDENTITY gerenator
     @Hidden
     @Column(name = "PK_ADRESA_TYP", insertable = false, nullable = false, updatable = true)
     @GeneratedValue(strategy=GenerationType.IDENTITY)
     private int pkAdresaTyp;
     @Required
     @Column(name = "KOD", length = 30, nullable = false, updatable = true)
     private String kod;
.....etc
In case of you are experiencing still some troubles witch some cascade actions, this could be regarding your foreing keys, exactly on on update on delete actions.
Hope it'll help.
archenroot
Edited by: user8916162 on Nov 9, 2010 11:18 AM