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Board index » Hibernate & Java Persistence » Hibernate Users (Deutsch)

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rafzio
 Post subject: Problem with finding sequence while opening session
PostPosted: Tue May 20, 2014 3:38 am 
Newbie

Joined: Tue May 20, 2014 3:18 am
Posts: 2
Hallo,
Ich bin ein Neueinsteiger bei Hibernate. Ich benutze Netbeans 8.0 und Postgersql 9.0. Ich habe eine Datenbank mit 2 einfachen Tabellen erstellt, beide haben ein Primärschlüssel. Für den Schlüssel benutze ich folgende Annotation:
@Id
@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "artists_artistid_seq")

@Column(name = "artistid", unique = true, nullable = false)
public int getArtistid() {
return this.artistid;
}

Die Sequenz existiert in der Datenbank. Wenn ich aber die Methode openSession aufrufe, dann kriege ich eine Exception mit folgender Meldung:

"Initial SessionFactory creation failed.org.hibernate.AnnotationException: Unknown Id.generator: public.artists_artistid_seq"

Vielen Dank für jeden Tip

Rafal Ziolkowski
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CDillinger
 Post subject: Re: Problem with finding sequence while opening session
PostPosted: Tue May 20, 2014 5:35 am 
Senior
Senior

Joined: Tue Oct 28, 2008 10:39 am
Posts: 196
Du brauchst noch eine Annotation an der Klasse, die den Sequenz-Namen mit einem Generator-Namen verknüpft.

In deinem Fall würde das so aussehen:

Code:
@Entity
@Table...
@SequenceGenerator(sequenceName = "artists_artistid_seq", name = "artists_id_gen")
public class Xyz {

@Id
@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "artists_id_gen")

@Column(name = "artistid", unique = true, nullable = false)
public int getArtistid() {
return this.artistid;
}

..
}
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rafzio
 Post subject: Re: Problem with finding sequence while opening session
PostPosted: Tue May 20, 2014 5:52 am 
Newbie

Joined: Tue May 20, 2014 3:18 am
Posts: 2
Ja, das funktioniert jetzt!

Vielen Dank

Rafal Ziolkowski
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pomi123
 Post subject: Re: Problem with finding sequence while opening session
PostPosted: Sat Oct 25, 2014 2:48 am 
Newbie

Joined: Sat Oct 25, 2014 2:40 am
Posts: 1
Ich versuche eine Tabelle uber 70 Tausend Datensazt zu lesen und in eine ArrayList zu speichern,aber ich bekomme leider am ende ein :
java.lang.OutOfMemoryError: Java heap space und die performance ich auch sehr schlecht 4 Min lese Zeit

__________
adil
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