Feature Requests item #852106, was opened at 2003-12-01 15:46
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Category: JBossCMP
Group: v3.2
Status: Open
Resolution: None
Priority: 5
Submitted By: Guillaume Compagnon (gcompagnon)
Assigned to: Nobody/Anonymous (nobody)
Summary: Oracle Sequence Create Command (one sequence per table)
Initial Comment:
Oracle Sequence Create Command (one sequence per
table)
As the existing OracleCreateCommand is not efficient as
all: we had to use a single sequence for all tables
(named SEQUENCE_TEST), we need to add another CMP
Create-command for supporting a more efficient
manner.
Each entity will have its own sequence in order to auto-
increment its primary key. The sequence will created by
the post-create-table using a generic pattern :
<tableName>_seq. (this pattern could be modified)
This feature has been fully implemented and tested
with Jboss 3.2.2.
Following the HOW-TO:
********************************************
*How to Configure the CMP Entities for using auto-
increment feature based on a Oracle Sequence with
XDoclet:
********************************************
(for those who don't use XDoclet for generating the
EJBs ... please refer to the jbosscmp-jdbc.xml)
*for each entities that need the auto-increment facility,
add the line
@jboss.persistence post-table-create="CREATE
SEQUENCE %%t_seq START WITH 1 INCREMENT BY 1"
into the class definition zone:
for example:
[...]
/**
* <ul><b>XDoclet configuration</b></ul>
*
*
* The DataSource registry used by that Entity
* @jboss.persistence datasource = "java:/OracleDS"
* Type of Mapping used for that Bean
* @jboss.persistence datasource-mapping = "Oracle9i"
*
* If the DB table doesn't exist, then create it using the
jboss mapping rules
* @jboss.persistence create-table = "true"
* If that bean is undeployed, then drop the DB table
* @jboss.persistence remove-table = "true"
*
* @jboss.tuned-updates "true"
* @jboss.persistence read-only="false"
* @jboss.persistence post-table-create="CREATE
SEQUENCE %%t_seq START WITH 1 INCREMENT BY 1
"
*
* Do not implement the PK constraint in the DB table
with the autogenerated PK
* @jboss.persistence pk-constraint = "false"
* Use a util method to get the generated PK by Oracle,
unless a NullPointerException is thrown (new feature of
jboss 3.2)
* @jboss.entity-command name = "oracle-table-
sequence"
*
* XDoclet configuration for ejb, documentation and
tutorial are on <A
HREF="http://xdoclet.sourceforge.net/";>http://xdoclet.
sourceforge.net/</A>
[...]
For declaring the class member to be the auto-
increment primary key:
[...]
/**
* @jboss.persistence auto-increment = "true" <-
--- this line is optional for Oracle but required for
Hypersonic or some others DBMS.
*
*
* @ejb.persistent-field
* @ejb.persistence column-name = "id"
* @ejb.interface-method view-type = "both"
* @ejb.pk-field
*
* The ID (generated by the DataStore)
* @return the id
* @author COMPAGNON
*
*/
abstract public Integer getID();
[...]
********************************************
*Enhance Jboss CMP with that CreateCommand
the Create Command should be declared inside
standardjbosscmp-jdbc.xml :
[..]
<entity-command name="oracle-table-sequence"
class="org.jboss.ejb.plugins.cmp.jdbc.keygen.JDBCOracl
eSequenceCreateCommand">
<attribute name="sequence_name">%%
t_seq</attribute>
</entity-command>
[..]
********************************************
Some feedbacks:
*there will be a Oracle warning when Jboss server
starts, because it tries to create sequence twice.
Nothing fatal for the good start of Jboss server, except
some ugly logs onto the console.
*Jboss post-create-table feature will create a sequence
for association table that is absolutely unnecessary.
=>these 2 dysfonctions will not appear if we decide not
to use the create-table feature.(as this should be done
on production stage).
------------------------------------------------------------
Guillaume Compagnon
[EMAIL PROTECTED]
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