Last November a message was posted regarding the use of Oracle Sequences. I
was wondering if somone was able to get this working.
http://archives.apache.org/eyebrowse/ReadMsg?[EMAIL PROTECTED]
e.org&msgId=528894
As posted, I have defined a trigger based oracle sequence such that the DB
will generate a new primary key when inserting a record. I've tried two
approaches with OJB.
1. Don't define a sequence and define primary key field as follows:
<field-descriptor name="label_Id" column="LABEL_ID" jdbc-type="INTEGER"
primarykey="true"/>
In this case the following sql is generated when I create an object. The
primary key gets created by the DB. However, OJB doesn't know what this is
and therefore cannot create foreign keys correctly.
SELECT LABEL_ID,RECORD_COMPANY_ID,LABEL_NAME FROM labels WHERE LABEL_ID =
'0'
INSERT INTO labels (LABEL_ID,LABEL_NAME,RECORD_COMPANY_ID) VALUES ( '0',
'some label', '11' )
2. Define a sequence manager
<sequence-manager
className="org.apache.ojb.broker.util.sequence.SequenceManagerNextValImpl"/>
and define primary key as follows:
<field-descriptor name="label_Id" column="LABEL_ID" jdbc-type="INTEGER"
primarykey="true"
autoincrement="true"
sequence-name="label_id_seq"
/>
In this case the following sql is generated when I create an object.
select label_id_seq.nextval from dual
SELECT LABEL_ID,RECORD_COMPANY_ID,LABEL_NAME FROM labels WHERE LABEL_ID =
'664'
INSERT INTO labels (LABEL_ID,LABEL_NAME,RECORD_COMPANY_ID) VALUES ( '664',
'some label', '11' )
The problem is that the id created in the DB is actaully 665 because of the
trigger on the insert. Again, the foreign key would be incorrect.
Are there any other solutions?
We are in the processing of evaluating a move from Castor to OJB. In castor
this is handled using the following sql:
{call INSERT INTO "SALES" ("SALES_YEAR","SALES_QUARTER","RECORD_COMPANY_ID")
VALUES ('1999','1','') RETURNING "SALES_ID" INTO null}
BTW, some of the posts refer to an Oracle specific sequencemanager -
however, I can't find this in the latest distribution (0.9.9).
Regards,
John O'Reilly
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