Hi

Im looking for an explanation of unsaved-value="ID_VALUE", i cant find much info on it anywhere, could somebody please tell me its purpose and usage

Thanks

Hibernate uses the unsaved-value to detect if your object has been inserted yet or not. If the id of the object matches the unsaved value, it does an insert, otherwise an update. (There are lots of ways to modify this behavior.)

see http://www.hibernate.org/hib_docs/refer ... aration-id, where it says "(4) unsaved-value (optional - defaults to null): An identifier property value that indicates that an instance is newly instantiated (unsaved), distinguishing it from transient instances that were saved or loaded in a previous session. "

Hi

I try to use unsaved-value="id_value" and it gives the error below? any ideas?

P.S the mapping is included below



Mapping spec from the manual
<id
name="propertyName" (1)
type="typename" (2)
column="column_name" (3)
unsaved-value="any|none|null|id_value" (4)
access="field|property|ClassName"> (5)

<generator class="generatorClass"/>
</id>
[i]

[B]ERROR[B]

net.sf.hibernate.MappingException: Could not parse unsaved-value: id_value
at net.sf.hibernate.persister.AbstractEntityPersister.<init>(AbstractEntityPersister.java:515)
at net.sf.hibernate.persister.EntityPersister.<init>(EntityPersister.java:623)
at net.sf.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:203)
at net.sf.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:594)
at HibernateDBConnection.initialiseSessions(HibernateDBConnection.java:44)
at HibernateDBConnection.getSession(HibernateDBConnection.java:66)
at XMLTest.getQuery(XMLTest.java:44)
at XMLTest.main(XMLTest.java:268)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:78)







[B]CODE AND MAPPING EXAMPLE[B]
<hibernate-mapping>
<!-- <class name="DTrns" table="d_trns" dynamic-update="true" select-before-update="true">-->
<class name="DTrns" table="d_trns" dynamic-update="true">
<id name="trnID" column="trn_id" type ="java.lang.Long" unsaved-value="id_value">
<generator class="native" />
</id>
<property name="workGroupBranchID" column="wkgrp_brch_id" not-null="true"/>
</class>
</hibernate-mapping>
[i]

Replace the string "ID_VALUE" (no quotes) with the actual value of the identifier that means "never been inserted". Perhaps 0, or null, depending on the type of your identifier column/property.

(I meant "id_value" not "ID_VALUE")

Thanks, worked a charm :)