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CMP 2.0 with oracle-sequence and composite primary key

Hetal Shah
Greenhorn

Joined: Feb 20, 2004
Posts: 2
Hi All,

I want to use the CMP 2.0 that would work with the oracle database sequence...
I m using Jboss 4.0.1 as my application server.

I have successfully used the Oracle sequence with my CMP 2.0, ....but it works only when the primary key is a single field primary key and not a composite key for which PrimaryKeyClass would have to be used.
Example when the primary key is a single field::

in ejb-jar.xml::==>

<prim-key-class>java.lang.Integer</prim-key-class>
<primkey-field>no</primkey-field>

in the jbosscmp-jdbc.xml file ::==>

<unknown-pk>
<unknown-pk-class>java.lang.Integer</unknown-pk-class>
<field-name>no</field-name>
<column-name>NO</column-name>
<jdbc-type>Integer</jdbc-type>
<sql-type>Integer</sql-type>
<auto-increment/>
</unknown-pk>
<entity-command name="oracle-sequence">
<attribute name="sequence">tempseq</attribute>
</entity-command>

Here <field-name>no</field-name> is my field on which oracle-sequence is applied....and so that I dont have to pass
that field while calling create method of the bean (CMP 2.0)...

The problem I face is that in one of the tables, the primary key is a composite key, constituting of 4 fields. On one of the fields out of these, the oracle-sequence is to be applied. But the above described method does not work in the case of composite primary key. Could some one please help me out in this ?

the ejb-jar.xml file has the following entry for the primary key class::==>
<prim-key-class>com.business.process.EjbTwoPK</prim-key-class>

in the jbosscmp-jdbc.xml file the entry for the field on which sequence is applied, is::==>
<unknown-pk>
<unknown-pk-class>com.business.process.EjbTwoPK</unknown-pk-class>
<field-name>emailId</field-name>
<column-name>EMAIL_ID</column-name>
<jdbc-type>Integer</jdbc-type>
<sql-type>Integer</sql-type>
<auto-increment/>
</unknown-pk>
<entity-command name="oracle-sequence">
<attribute name="sequence">MT_REQ_EMAIL_ID_SEQ</attribute>
</entity-command>

But with above configuration, at deployment time, I get following exception ................. ==>

org.jboss.deployment.DeploymentException: Generation only supported with single PK field
at org.jboss.ejb.plugins.cmp.jdbc.JDBCAbstractCreateCommand.getGenerated
PKField(JDBCAbstractCreateCommand.java:160)
at org.jboss.ejb.plugins.cmp.jdbc.JDBCIdentityColumnCreateCommand.initGe
neratedFields(JDBCIdentityColumnCreateCommand.java:46)
at org.jboss.ejb.plugins.cmp.jdbc.JDBCAbstractCreateCommand.init(JDBCAbs
tractCreateCommand.java:84)
at org.jboss.ejb.plugins.cmp.jdbc.keygen.JDBCOracleCreateCommand.init(JD
BCOracleCreateCommand.java:37)
at org.jboss.ejb.plugins.cmp.jdbc.JDBCCommandFactory.createCreateEntityC
ommand(JDBCCommandFactory.java:151)
at org.jboss.ejb.plugins.cmp.jdbc.JDBCStoreManager.startStoreManager(JDB
CStoreManager.java:466)
at org.jboss.ejb.plugins.cmp.jdbc.JDBCStoreManager.start(JDBCStoreManage


Please guide me in using Oracle-sequence with CMP 2.0 EntityBean when the primary key is composite key and the application server used is JBoss 4.0.1.

Thanks in advance,
 
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