JDO Mapping to same object as parent/child 1:n relationship

Hello,
i'm trying to do a mapping the following way:
Node (1:n) Node where the Node should have the following
accessors:
getChildNodes()   : Set
getParentalNode() : Node
I do have the getChildNodes mapping working, but cannot get the parental relation established due to problems with the Node.map file containing the following:
      <relationship-field name="parentalNode" multiplicity="one">
          <foreign-key name="NODE_TO_PARENTALNODE"
               foreign-key-table="TPB_NODE"
               primary-key-table="TPB_NODE">
            <column-pair foreign-key-column="ID"
                         primary-key-column="PARENT_ID"/>
          </foreign-key>
      </relationship-field>
Using this the checker complains about
javax.jdo.JDOFatalUserException: Error in mapping model of class Node: Relationship of field parentalNode: Primary key column PARENT_ID of relationship's foreign key and target class's com.vw.tpb.node.model.Node primary key columns do not match.
Well. When i do a 1:n relation to myself how should i create two primary keys then ?
Anybody some ideas on this one ?
regards, Udo

Hi Udo,
for the reference from child to parent, the column "ID" should be the primary key colum, whereas the column "PARENT_ID" should be the foreign key column.
Best regards,
Adrian

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Edited by: 914626 on Mar 4, 2012 10:14 PM
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Thanks for the thoroughness. There was a mistake in moving the code over for the forum. The field names are correct throughout the original source code.
BASE_OBJECT_ID is used throughout.
I suspect the problem lies in the one-to-many sampleItem(s) relationship that is based upon the subclassed item class. (The relationship is actually "sampleItems" in the real code and somehow got changed in the move over.)
The problem may lie in the mapping of the attribute override in the child class to the referencing of the item class from the parent side of the relationship in the Sample class.
I further suspect this may be specific to Eclipselink based upon other postings I've seen on the web that have similar problems...
Any thoughts?
Edited by: Chris-R on Mar 3, 2010 9:56 AM

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===============
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I want to create a query that is a union such that the 2nd resultset is based on the 1st resultset. I have a table that has parent/child records in the same table.
Table: EVENTS
EVENT_ID
PARENT_EVENT_ID
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(other columns)
if PARENT_EVENT_ID is null then it is a parent record, else it is a child record. I want to select all parent records then union them with all the associated child records...something like this:
select * from EVENTS where CREATED_DATE < sysdate - 90 and PARENT_EVENT_ID is null -- All parents
union
select * from EVENTS where PARENT_EVENT_ID in (select EVENT_ID from EVENTS where CREATED_DATE < sysdate - 90 and PARENT_EVENT_ID is null) -- include any children of parents selected from above
This works but it's kind of ugly, I want to avoid using the sub-select in the 2nd because it is a repeat of the 1st statement, is there a way to alias the first statement and just refer to it in the 2nd query?

Hi,
kev374 wrote:
Thanks, one question...
I did a test and it seems the child rows have to also satisfy the parent row's where clause, take this example:
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2438 | (null) | April 9 2013
2439 | 2438 | April 11 2013
2440 | 2438 | April 11 2013
select * from EVENTS where CREATED_DATE < sysdate - 9
start with EVENT_ID = 2438
connect by PARENT_EVENT_ID = prior EVENT_IDSo you've changed the condition about only wanting roots and their children, and now you want descendants at all levels.
This pulls in record #2438 (per the sysdate - 9 condition) but 2439 and 2440 are not connected. Is there a way to supress the where clause evaluation for the child records? I just want to pull ALL child records associated with the parent and only want to do the date check on the parent.Since the roots (the only rows you want to exclude) have LEVEL=1, you can get the results you requested like this:
WHERE   created_date < SYSDATE - 9
OR      LEVEL         > 1However, since you're not ruling out the grandchildren and great-grandchildren any more, why wouldn't you just say:
SELECT *
FROM    events
WHERE   created_date     < SYSDATE - 9
OR      parent_event_id IS NOT NULL;?
CONNECT BY is slow. Don't use it if you don't need it.
If you x-reference my original query:
select * from EVENTS where CREATED_DATE < sysdate - 90 and PARENT_EVENT_ID is null -- All parents
union
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The 2nd select does not apply the created_date < sysdate - 90 on the children but rather pulls in all related children :)Sorry; my mistake. That's what happens when you don't post sample data, and desired results; people can't test their solutions and find mistakes like that.

Informatica parent child mapping

  down votefavorite I have a scenario where suppose saycountry      province      city      zip
ind           ts           hyd       xyz
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Thanks for the thoroughness. There was a mistake in moving the code over for the forum. The field names are correct throughout the original source code.
BASE_OBJECT_ID is used throughout.
I suspect the problem lies in the one-to-many sampleItem(s) relationship that is based upon the subclassed item class. (The relationship is actually "sampleItems" in the real code and somehow got changed in the move over.)
The problem may lie in the mapping of the attribute override in the child class to the referencing of the item class from the parent side of the relationship in the Sample class.
I further suspect this may be specific to Eclipselink based upon other postings I've seen on the web that have similar problems...
Any thoughts?
Edited by: Chris-R on Mar 3, 2010 9:56 AM

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I am trying to map an existing legacy Oracle schema that involves a base class table and two subclass tables that are related by a one-to-many relationship which is of a parent-child nature.
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Exception [EclipseLink-45] (Eclipse Persistence Services - 2.0.0.v20091127-r5931): org.eclipse.persistence.exceptions.DescriptorException
Exception Description: Missing mapping for field [BASE_OBJECT.SAMPLE_ID].
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CREATE TABLE BASE_OBJECT(
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CREATE TABLE SAMPLE(
"SAMPLE_ID" INTEGER PRIMARY KEY NOT NULL,
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CREATE TABLE SAMPLE_ITEM(
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"QUANTITY" INTEGER NOT NULL )
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SAMPLE_ITEM.SAMPLE_ITEM_ID -> BASE_OBJECT.BASE_OBJECT_ID - The PKs that are used to join the sample item to the base class
SAMPLE_ITEM.SAMPLE_ID -> SAMPLE.SAMPLE_ID - The FK that is used to join the sample item to the sample class as a child of the parent.
SAMPLE is one to many SAMPLE_ITEM
The entity classes are as follows:
@Entity
@Table( name = "BASE_OBJECT" )
@Inheritance( strategy = InheritanceType.JOINED )
@DiscriminatorColumn( name = "BASE_KIND", discriminatorType = DiscriminatorType.INTEGER )
@DiscriminatorValue( "1" )
public class BaseObject
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@GeneratedValue( strategy = GenerationType.SEQUENCE, generator = "BaseObjectIdSeqGen" )
@SequenceGenerator( name = "BaseObjectIdSeqGen", sequenceName = "BASE_OBJECT_PK_SEQ", allocationSize = 1 )
@Column( name = "BASE_ID" )
private long baseObjectId = 0;
@Entity
@Table( name = "SAMPLE" )
@PrimaryKeyJoinColumn( name = "SAMPLE_ID" )
@AttributeOverride(name="baseObjectId", column=@Column(name="SAMPLE_ID"))
@DiscriminatorValue( "2" )
public class Sample
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@OneToMany( cascade = CascadeType.ALL )
@JoinColumn(name="SAMPLE_ID",referencedColumnName="SAMPLE_ID")
private List<SampleItem> sampleItem = new LinkedList<SampleItem>();
@Entity
@Table( name = "SAMPLE_ITEM" )
@PrimaryKeyJoinColumn( name = "SAMPLE_ITEM_ID" )
@AttributeOverride(name="baseObjectId", column=@Column(name="SAMPLE_ITEM_ID"))
@DiscriminatorValue( "3" )
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Edited by: Chris-R on Mar 2, 2010 4:45 PM

Thanks for the thoroughness. There was a mistake in moving the code over for the forum. The field names are correct throughout the original source code.
BASE_OBJECT_ID is used throughout.
I suspect the problem lies in the one-to-many sampleItem(s) relationship that is based upon the subclassed item class. (The relationship is actually "sampleItems" in the real code and somehow got changed in the move over.)
The problem may lie in the mapping of the attribute override in the child class to the referencing of the item class from the parent side of the relationship in the Sample class.
I further suspect this may be specific to Eclipselink based upon other postings I've seen on the web that have similar problems...
Any thoughts?
Edited by: Chris-R on Mar 3, 2010 9:56 AM

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TechNet
Subscriber Supportinforum
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If this is a question, the extension you have is only a directive to
mappingtool to create cascade foreign keys. However, at runtime Kodo
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Ahmet Bulut wrote:
Assume that I have two classes that I'd like to persist: MyObject and
InternalObject. MyObject has an InternalObject field. That is, MyObject is
the parent, InternalObject is the child in this one-to-one relationship.
Steps involved:
1) Enable ForeignKeyConstraints property in kodo.properties. That is add
the line,
kodo.jdbc.ForeignKeyConstraints=true
2) In package.jdo, add the following kodo extensions for MyObject's
InternalObject field mapping, i.e., io in my case.
<field name="io" default-fetch-group="false">
<extension vendor-name="kodo" key="jdbc-delete-action"
value="cascade"/>
<extension vendor-name="kodo" key="dependent" value="true"/>
</field>
The reasons that we have done these steps: we'd like kodo to properly
re-order the sql statements if necessary in order not to violate
parent/child dependencies during insertion, and also force cascading
deletes in case we delete the parent object.
Now comes the bulk of the algorithm.
String sKey // key of the object to insert
String sValue //value of the object to insert
MyObject o = new MyObject(sKey, sValue);
InternalObject io = new InternalObject(sKey,sValue); //using same values :)
o.setInternalObject(io); //parent-child relation
Object id = ((PersistenceCapable) o).jdoNewObjectIdInstance();
((PersistenceCapable)o).jdoCopyKeyFieldsToObjectId(id);
kpm.currentTransaction().begin();
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Object trio = kpm.getObjectById(id, true);
kpm.deletePersistent(trio);
kpm.flush(); //apply deletes on the datastore
} catch (ObjectNotFoundException oe) {
System.out.println("First time!");
kpm.makePersistent(o);
kpm.currentTransaction().commit();
Steve Kim
[email protected]
SolarMetric Inc.
http://www.solarmetric.com

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In nutshell, I have a parent->child relation ship in DB and due to the UI requirement, I created view link as Child->parent, it is giving a hack a lot of problems.... (it sounds silly but looks like I am loosing my mind over this)
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that depends on how you implement the multiple selection of orders.. you have to pass the selectedValues to the backend or store the values in a map or list and pass it..

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I'm querying a database to obtain information from 10 tables. The goal is to display the information on a JSF based portlet using a tree-view, where an user can use the tree interface to drill to desired level of detailed information. The interface may need to show 3/4 different tree-views of the same data set.
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Ok, so let me explain this in detail and give the structure of my tables and the data,
There are three tables.
1.Parent Child relationship table - pctable
2.Closure table which OBIEE creates through a script - reltable
3.Fact table which contains the revenue - facttable
This is the data
pctable
personid | managerid
David | NULL
Sandra| David
Joe|Sandra
reltable
memberkey | ancestorkey |distance |is_leaf
David|NULL|NULL|0
David|David|0|0
Sandra|Sandra|0|0
Joe|Joe|0|0
Sandra|David|1|0
Joe|Sandra|1|1
Joe|David|2|1
facttable
personid|revenue
David|5
Sandra|5
Joe|10
and my joins conditions are, I join pctable to reltable and then reltable is joined to facttable like this.
pctable.personid = reltable.ancestorkey
reltable.memberkey = facttable.personid
and then in the report, when I pull up the pchierarchy build from pctable and revenue , I get as below and like I said, when I click on Sandra to see the revenue she contributes, I am not able to navigate. Can you let me know what modifications needs to be done?
---David(20)
----Sandra(15)
------Joe(10)

JDO Mapping to same object as parent/child 1:n relationship

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