[JBoss-user] CMP - Primary Key generation

Loï¿½c Lefï¿½vre Mon, 28 Jan 2002 06:31:31 -0800

Hi,

After some time passed on the JBoss forum, I found an article explaining
some
process to manage "automatic primary key generation"
(http://www.theserverside.com/resources/review/ejbpatterns-primarykeystrateg
ies-sept3.zip).


In appendix A.1, there is some code using a sequencer. I found that the ejb
desciptor is
written for CMP version 2.x, is it possible to use these EJBs for CMP
version 1.0? :D

Second question:
Where can I found a description of the differences between JBoss 2.4.4 and
JBoss 3.0? :)

here is the code:

---8<-----------------------------------------------------------
<?xml version="1.0"?>
<!DOCTYPE ejb-jar PUBLIC '-//Sun Microsystems,
 Inc.//DTD Enterprise JavaBeans 2.0//EN'
'http://java.sun.com/dtd/ejb-jar_2_0.dtd'>

<ejb-jar>
<enterprise-beans>
<entity>
     <ejb-name>Sequence</ejb-name>
     <local-home>examples.sequencegenerator.SequenceLocalHome</local-home>
     <local>examples.sequencegenerator.Sequence</local>
     <ejb-class>examples.sequencegenerator.SequenceBean</ejb-class>
     <persistence-type>Container</persistence-type>
     <prim-key-class>java.lang.String</prim-key-class>
     <reentrant>False</reentrant>
     <cmp-version>2.x</cmp-version>
     <abstract-schema-name>SequenceBean</abstract-schema-name>
     <cmp-field>
          <field-name>index</field-name>
     </cmp-field>
     <cmp-field>
          <field-name>name</field-name>
     </cmp-field>
     <primkey-field>name</primkey-field>
     <env-entry>
          <env-entry-name>datasourceName</env-entry-name>
          <env-entry-type>java.lang.String</env-entry-type>
          <env-entry-value>bookPool</env-entry-value>
     </env-entry>
     <resource-ref>
     <res-ref-name>jdbc/bookPool</res-ref-name>
          <res-type>javax.sql.DataSource</res-type>
          <res-auth>Container</res-auth>
     </resource-ref>
</entity>

<session>
     <ejb-name>SequenceSession</ejb-name>
     <home>examples.sequencegenerator.SequenceSessionHome</home>
     <remote>examples.sequencegenerator.SequenceSession</remote>

<local-home>examples.sequencegenerator.SequenceSessionLocalHome</local-home>
     <local>examples.sequencegenerator.SequenceSessionLocal</local>
     <ejb-class>examples.sequencegenerator.SequenceSessionBean</ejb-class>
     <session-type>Stateless</session-type>
     <transaction-type>Container</transaction-type>
     <env-entry>
          <description />
          <env-entry-name>retryCount</env-entry-name>
          <env-entry-type>java.lang.Integer</env-entry-type>
          <env-entry-value>5</env-entry-value>
     </env-entry>
     <env-entry>
          <description />
          <env-entry-name>blockSize</env-entry-name>
          <env-entry-type>java.lang.Integer</env-entry-type>
          <env-entry-value>10</env-entry-value>
     </env-entry>
</session>
</enterprise-beans>

<assembly-descriptor>
<container-transaction>
     <method>
          <ejb-name>Sequence</ejb-name>
          <method-name>getValueAfterIncrementingBy</method-name>
     </method>
     <trans-attribute>RequiresNew</trans-attribute>
</container-transaction>
<container-transaction>
     <method>
          <ejb-name>SequenceSession</ejb-name>
          <method-name>*</method-name>
     </method>
     <trans-attribute>Required</trans-attribute>
</container-transaction>
</assembly-descriptor>
</ejb-jar>
---8<-----------------------------------------------------------

Best regards,
Loï¿½c Lefï¿½vre


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