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srossouw
 Post subject: <id> tags
PostPosted: Fri May 13, 2005 4:26 am 
Beginner
Beginner

Joined: Mon Mar 07, 2005 12:02 pm
Posts: 39
Im having some trouble understanding the <id> tags in hibernate:

Hibernate version: 2.0

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 2.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">

<hibernate-mapping
>
<class
name="co.za.ep.CDS2.bus.Customer"
table="customer_tbl"
dynamic-update="false"
dynamic-insert="false"
select-before-update="false"
optimistic-lock="version"
>

<id
name="id"
column="customer_id"
type="int"
unsaved-value="null"
>
<generator class="native">
</generator>
</id>

<property
name="name"
type="java.lang.String"
update="true"
insert="true"
access="property"
column="customer_name"
/>
</class>

</hibernate-mapping>

Customer cs = new Customer();
cs.setName("Don");
cs.setId(3);
sess.save(cs);



MySql

When I do this I get a null in my customer_id field. Shouldnt it be 3? Why does hibernate want to generate a id if I give it to hibernate? I dont know if I'm understanding this correctly. Could someone please fill this void I have in my hibernate knowledge.
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ernst_pluess
 Post subject:
PostPosted: Fri May 13, 2005 4:38 am 
Expert
Expert

Joined: Thu Jan 29, 2004 2:31 am
Posts: 362
Location: Switzerland, Bern
You are mixing assigned and generated keys. RTM Chapter 6.1.4.

HTH
Ernst
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srossouw
 Post subject:
PostPosted: Fri May 13, 2005 5:00 am 
Beginner
Beginner

Joined: Mon Mar 07, 2005 12:02 pm
Posts: 39
Hi there,

Thanks, that helped alot. Why would the "http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd" state that you have to have a <generator > in your <id> ?
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ernst_pluess
 Post subject:
PostPosted: Fri May 13, 2005 5:19 am 
Expert
Expert

Joined: Thu Jan 29, 2004 2:31 am
Posts: 362
Location: Switzerland, Bern
use
Code:
generator="assigned"


HTH
Ernst
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srossouw
 Post subject:
PostPosted: Fri May 13, 2005 6:02 am 
Beginner
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Joined: Mon Mar 07, 2005 12:02 pm
Posts: 39
Thanx, its working nicely. Why do I get this error with the above mapping file?

Code:
org.xml.sax.SAXParseException: Attribute "access" must be declared for element type "property".
[/quote]
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srossouw
 Post subject:
PostPosted: Fri May 13, 2005 7:37 am 
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Joined: Mon Mar 07, 2005 12:02 pm
Posts: 39
How would you go abouts using a class as a id? I have a class called delivery which does not have a id field but it contains a field that is an Order which uniquely identfy it. How would I map such an Id?
Code:
public class Delivery {
   
   private Order __order;
   private ServiceProvider __serviceProvider;

   public void setOrder(Order order) {
      __order = order;
   }      

   public void setTokens(List tokens) {
      __tokens = tokens;
   }

   public Order getOrder() {
      return __order;
   }   

   public List getTokens() {
      return __tokens;
   }   

}

Code:
public class Order{
                private List __orders;
                private String __order_number;

   public List getOrders() {
      return __order;
   }

   public void setOrder(List orders) {
      __order = order;
   }
               
   public String getOrderNumber() {
      return __order_number;
   }

   public void setOrderNumber(String order_number) {
      __order_number = order_number;
   }



}
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pksiv
 Post subject:
PostPosted: Fri May 13, 2005 8:44 am 
Expert
Expert

Joined: Mon Feb 14, 2005 12:32 pm
Posts: 609
Location: Atlanta, GA - USA
srossouw wrote:
How would you go abouts using a class as a id? I have a class called delivery which does not have a id field but it contains a field that is an Order which uniquely identfy it. How would I map such an Id?
Code:
public class Delivery {
   
   private Order __order;
   private ServiceProvider __serviceProvider;

   public void setOrder(Order order) {
      __order = order;
   }      

   public void setTokens(List tokens) {
      __tokens = tokens;
   }

   public Order getOrder() {
      return __order;
   }   

   public List getTokens() {
      return __tokens;
   }   

}

Code:
public class Order{
                private List __orders;
                private String __order_number;

   public List getOrders() {
      return __order;
   }

   public void setOrder(List orders) {
      __order = order;
   }
               
   public String getOrderNumber() {
      return __order_number;
   }

   public void setOrderNumber(String order_number) {
      __order_number = order_number;
   }



}


Check out the "foreign" id generator.
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srossouw
 Post subject:
PostPosted: Mon May 16, 2005 3:32 am 
Beginner
Beginner

Joined: Mon Mar 07, 2005 12:02 pm
Posts: 39
Cant seem to get it working, can anyone give me some direction?

this is my mapping file so far:

Code:
<hibernate-mapping
>
    <class
        name="co.za.ep.CDS2.bus.Delivery"
        table="delivery_tbl"
        dynamic-update="false"
        dynamic-insert="false"
        select-before-update="false"
        optimistic-lock="version"
    >

   <id type="int">
           <generator class="foreign">
               <param name="property">order</param>
           </generator>
   </id>





        <bag
            name="order"
            lazy="false"
            inverse="false"
            cascade="none"
        >

              <key
                  column="delivery_id"
              >
              </key>

              <one-to-many
                  class="co.za.ep.CDS2.bus.Order"
              />

        </bag>

        <!--
            To add non XDoclet property mappings, create a file named
                hibernate-properties-Customer.xml
            containing the additional properties and place it in your merge dir.
        -->

    </class>

</hibernate-mapping>


And this is the error I get:
Code:
net.sf.hibernate.PropertyAccessException: exception setting property value with CGLIB setter of co.za.ep.CDS2.bus.Delivery.?
   at net.sf.hibernate.persister.AbstractEntityPersister.setPropertyValues(AbstractEntityPersister.java:163)
   at net.sf.hibernate.impl.SessionImpl.initializeEntity(SessionImpl.java:1964)
   at net.sf.hibernate.loader.Loader.doFind(Loader.java:196)
   at net.sf.hibernate.loader.Loader.find(Loader.java:604)
   at net.sf.hibernate.hql.QueryTranslator.find(QueryTranslator.java:912)
   at net.sf.hibernate.impl.SessionImpl.find(SessionImpl.java:1356)
   at net.sf.hibernate.impl.SessionImpl.find(SessionImpl.java:1335)
   at net.sf.hibernate.impl.SessionImpl.find(SessionImpl.java:1327)
   at co.za.ep.CDS2.bus.GetTest.main(GetTest.java:39)
Caused by: java.lang.ClassCastException
   at co.za.ep.CDS2.bus.DeliveryMetaClass0.setPropertyValues(<generated>)
   at net.sf.hibernate.persister.AbstractEntityPersister.setPropertyValues(AbstractEntityPersister.java:158)
   ... 8 more
Exception in thread "main"


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