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nadia
 Post subject: need help with composite id Nhibernate
PostPosted: Mon Aug 21, 2006 8:51 am 
Newbie

Joined: Mon Aug 21, 2006 8:33 am
Posts: 3
I have a problem to insert a composite-id object into Mysql database
The problem is that before inserting a new object into database I should verify if the object already exist or no
I tried to use Isession.get() but I don't know which identifier should I enter
Code:
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.0" auto-import="true" >
<class name="FlatInfo.DataCollector.Service,FlatInfo.DataCollector" table="Service" lazy="true" mutable="true">
   <composite-id>
      <key-property name="ServiceName" type="System.String"/>
      <key-property name="Version" type="System.String"/>             
   </composite-id>
   
</class>
</hibernate-mapping>

or should i change the mapping file and manage to have an auto generated id

Please is there any one to help it is urgent!!!!!
[/quote]
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bsayles
 Post subject:
PostPosted: Mon Aug 21, 2006 4:34 pm 
Newbie

Joined: Mon Aug 07, 2006 6:40 pm
Posts: 12
Location: Atlanta, GA
Without seeing your code:

[1]You need to create a class (it could be nested) that represents the composite key that conforms to NHibernate class design rules for your implementation
[2]Add a property for an object of that class
[3]Add the name="" to the <composite-id> element with name of the property

The Get() method would then accept the class you have added as key object argument

Of course, creating a single identifier of a native type would also address it. Since your composite key is not a native type, you need to provide one.
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