Re: @Version annotation

[Craig L Russell]

Seems like it would be useful for OpenJPA to issue a warning or an error in the case of the user specifying both @Version and @GeneratedValue on the same property.

Craig

On Nov 16, 2009, at 9:08 AM, Fay Wang wrote:

Hi,


 @Version
 public long getVersion() {
   return this.version;
 }



----- Original Message ----
From: yokenji <kenji2...@gmail.com>
To: users@openjpa.apache.org
Sent: Mon, November 16, 2009 8:46:48 AM
Subject: @Version annotation


Hi there,


don't see any version in the database.

Also,
Element class:

package entities;

import java.io.Serializable;
import java.util.Set;

import javax.annotation.Generated;
import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.NamedQueries;
import javax.persistence.NamedQuery;
import javax.persistence.OneToMany;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
import javax.persistence.Version;

import org.apache.openjpa.persistence.jdbc.ForeignKey;

/**
* @author Ken
*/
@Entity
@NamedQueries({
   @NamedQuery(name="roots.Element",
       query="Select e From Element e" +
             " where e.parentElement is null"),
   @NamedQuery(name="one.Element",
       query="Select e From Element e" +
             " where e.dbID = :id")
})
@Table(name="Element")
public class Element implements ElementInterface, Serializable {

 private static final long serialVersionUID = 4627343050926103812L;

 private String dbID;
 private String internID;
 private String name;
 private String description;
 private long   version;

 private Set<Property>        properties;
 private Element              parentElement;
 private Set<Element> childElements;

 /**
  * This is the default constructor.
  */
 public Element() {
 }

 /**
  * @see entities.ElementInterface#setDbID(java.lang.String)
  */
 public void setDbID(String dbID) {
   this.dbID = dbID;
 }

 /**
  * @see entities.ElementInterface#getDbID()
  */
 @Id
 @GeneratedValue(strategy = GenerationType.AUTO, generator="uuid-hex")
 public String getDbID() {
   return this.dbID;
 }

 /**
  * @see entities.ElementInterface#setInternID(java.lang.String)
  */
 public void setInternID(String internID) {
   this.internID = internID;
 }

 /**
  * @see entities.ElementInterface#getInternID()
  */
 public String getInternID() {
   return this.internID;
 }


 /**
  * @see entities.ElementInterface#getName()
  */
 public String getName() {
   return this.name;
 }

 /**
  * @see entities.ElementInterface#setName(java.lang.String)
  */
 public void setName(String name) {
   this.name = name;
 }

 /**
  * @see entities.ElementInterface#setDescription(java.lang.String)
  */
 public void setDescription(String description) {
   this.description = description;
 }

 /**
  * @see entities.ElementInterface#getDescription()
  */
 public String getDescription() {
   return this.description;
 }

 /**
  * @see entities.ElementInterface#setVersion(java.util.Date)
  */
 private void setVersion(int version) {
   this.version = version;
 }

 /**
  * @see entities.ElementInterface#getVersion()
  */
 @Version
 @GeneratedValue(strategy=GenerationType.AUTO)
 public long getVersion() {
   return this.version;
 }

 /**
  * Set the element properties.
  *
  * @param Set<Property> properties
  */
 public void setProperties(Set<Property> properties) {
   this.properties = properties;
 }

 /**
  * Get the element properties.
  *
  * @return Set<Property>
  */
 @OneToMany(cascade=CascadeType.ALL, fetch=FetchType.EAGER,
mappedBy="element")
 public Set<Property> getProperties() {
   return properties;
 }

 /**
  * Set the element parent.
  *
  * @param Element parentElement
  */
 public void setParentElement(Element parentElement) {
   this.parentElement = parentElement;
 }

 /**
  * Get the element parent.
  *
  * @return Element
  */
 @ManyToOne(optional=true, fetch=FetchType.LAZY)
 @ForeignKey(name="FK_parent_element")
 @JoinColumn(name="parent_element", referencedColumnName="dbID")
 public Element getParentElement() {
   return parentElement;
 }

 /**
  * Set the element children.
  *
  * @param Set<Element> childElements
  */
 public void setChildElements(Set<Element> childElements) {
   this.childElements = childElements;
 }

 /**
  * Get the element children.
  *
  * @return Set<Element>
  */
 @OneToMany(cascade=CascadeType.ALL, mappedBy="parentElement",
fetch=FetchType.EAGER)
 public Set<Element> getChildElements() {
   return childElements;
 }

}

Class Property:


package entities;

import java.io.Serializable;
import javax.persistence.*;
import org.apache.openjpa.persistence.jdbc.ForeignKey;

/**
* @author Ken
*/
@Entity
@NamedQueries({
 @NamedQuery(name="all.properties",
     query="Select p From Property p"),
 @NamedQuery(name="elementTemplate.properties",
     query="Select p From Property p" +
           " where p.elementTemplate = :owner"),
 @NamedQuery(name="one.property",
     query="Select p From Property p" +
           " where p.dbID = :id")
})
@Table(name="Property")
public class Property implements Serializable {

 private static final long serialVersionUID = -6988886476498387460L;

 private String          dbID;
 private String          property;
 private String          value;
 private Element         element;
 private ElementTemplate elementTemplate;

 /**
  * This is the default constructor.
  */
 public Property() {
 }

 /**
  * Set the property dbID.
  *
  * @param String dbID
  */
 public void setDbID(String dbID) {
   this.dbID = dbID;
 }

 /**
  * Get the property dbID.
  *
  * @return
  */
 @Id
 @GeneratedValue(strategy=GenerationType.AUTO, generator="uuid-hex")
 public String getDbID() {
   return this.dbID;
 }

 /**
  * Set the property property
  *
  * @param String property
  */
 public void setProperty(String property) {
   this.property = property;
 }

 /**
  * Get the property property.
  *
  * @return String
  */
 public String getProperty() {
   return property;
 }

 /**
  * Set the property value.
  *
  * @param String value
  */
 public void setValue(String value) {
   this.value = value;
 }

 /**
  * Get the property value.
  *
  * @return String
  */
 public String getValue() {
   return value;
 }

 /**
  * Set property element.
  *
  * @param Element element
  */
 public void setElement(Element element) {
   this.element = element;
 }

 /**
  * Get the property element.
  *
  * @return Element
  */
 @ManyToOne(fetch=FetchType.LAZY)
 @ForeignKey(name="FK_property_element")
 @JoinColumn(name="element")
 public Element getElement() {
   return element;
 }

 /**
  * Set the property elementTemplate.
  *
  * @param ElementTemplate elementTemplate
  */
 public void setElementTemplate(ElementTemplate elementTemplate) {
   this.elementTemplate = elementTemplate;
 }

 /**
  * Get the property elementTemplate.
  *
  * @return ElementTemplate
  */
 @ManyToOne(fetch=FetchType.LAZY)
 @ForeignKey(name="FK_property_elementTemplate")
 @JoinColumn(name="elementTemplate")
 public ElementTemplate getElementTemplate() {
   return elementTemplate;
 }

}

to update the element I do this:
Element element = em.find(Element.class, elementID);

//Add changements to the element


// update the element.
em.persist(element);



Please help :)


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Sent from the OpenJPA Users mailing list archive at Nabble.com.

You don't need to put generatedValue annotation for the version field. Openjpa will keep track of the version for you. I trying to use an annotatoin field @version but when updating the record i The update worked but I don't see any version number in my database field.

Craig L Russell
Architect, Sun Java Enterprise System http://db.apache.org/jdo
408 276-5638 mailto:craig.russ...@sun.com
P.S. A good JDO? O, Gasp!

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