C M P   2 . 0  
Relationship Declaration 
The declaration of relationships in the ejb jar.xml file is complicated and error prone.  The 
XML used to declared relationships is as inconsistent as Visual Basic syntax.  The best way 
to configure a relationship is to use a tool, such as 
XDoclet
, or cut and paste a working 
relationship. The ejb jar.xml declaration of the Organization Gangster relationship follows: 
 
    
       
         
Organization Gangster
 
          
             
org has gangsters
 
            
One
 
             
               
OrganizationEJB
 
             
             
               
memberGangsters
 
               
java.util.Set
 
             
          
          
             
gangster belongs to org
 
            
Many
 
             
             
               
GangsterEJB
 
             
             
               
organization
 
             
          
       
   
 
Listing 9 8, The ejb jar.xml Relationship Declaration 
After adding the cmr field abstract accessors and declaring the relationship, the relationship 
should be functional. For more information on relationships, see Chapter 4 of the JBossCMP 
Documentation, or Section 10.3 of the 
Enterprise JavaBeans Specification Version 2.0 Final 
Release
. The next section discusses the database mapping of the relationship. 
Relationship Mapping 
Relationships can be mapped using either a foreign key or a separate relation table. 
One to one and one to many relationships use the foreign key mapping style by default, and 
many to many relationships use only the relation table mapping style. The mapping of a 
89






footer




 

 

 

 

 Home | About Us | Network | Services | Support | FAQ | Control Panel | Order Online | Sitemap | Contact

best web hosting

 

Our partners: PHP: Hypertext Preprocessor Cheap Web Hosting JSP Web Hosting Ontario Web Hosting  Jsp Web Hosting

Cheapest Web Hosting Java Hosting Cheapest Hosting

Visionwebhosting.net Business web hosting division of Vision Web Hosting Inc.. All rights reserved