Custom: use constant value in relationship between objects?

I have two related classes:
* Class A uses application identity, and has multiple PK fields, PK1 and
PK2.
* Class B has a 1-many relationship with class A. However, class B's
database table only has a column that relates to Class A's PK2 column.
(the PK1 value is a constant) for all Class B objects).
I have no idea how to express this relationship via kodo. Can anyone
assist?

What I've chosen to do is add a new DB column to my table which has a
constant value (ie: is the same for every row). Then I can join with it.
I'd request this simple feature to be added in a future release: the
ability to specify a literarl constant value as part of the join
criteria in the metadata. It could be very easily added: instead of
specifying a column containing the join value, you could put the literal
into the .jdo file.
thanks.
Patrick Linskey wrote:
You could put together a custom field mapping that performed the join
like you described if you really wanted to. Bear in mind, however, that
the field mapping APIs are subject to change etc. etc. etc.
-Patrick
On Tue, 20 May 2003 22:25:16 -0400, David Michaels wrote:
Thanks for the quick reply, as usual Abe.
In this case, I will link to the full PK of the related object, just one
of the components of that PK is a constant. There's no place to
override the SQL used for these sort of joins?
Perhaps I can do this with a view too.
Abe White wrote:
It's not possible to create a Kodo relation that doesn't actually link
to the (full) primary key of the related object. Note that in general,
that kind of database design is not a good idea, because there's no
guarantee you're linking to a unique object.
You can use a Kodo query to get the related objects; you could hide the
query behind your getter method.

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"jwoozy" <[email protected]> wrote in
message
news:g96kmn$80o$[email protected]..
> I've been tasked/ proposed to deliver a new project
involving two
> displayObjects... say 2 squares. Between those squares,
I need to show a
> connecting relationship of hierarchy. So, I need to have
a visual line
> connecting the 2 objects.
>
> Does anyone know if there is already a class for this in
Flex or what I
> might
> use to demo this quickly. Never done this sort of data
visualization
> before,
> but the math can't be to hard.
>
I think there is something here
http://flexbox.mrinalwadhwa.com/,
but I
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Relationship between objects and information stored in a database

I've got a question that's pretty broad... but maybe someone can help with it.
I'm writing a couple of classes, one called "Customer" and the other "Store". Store can contain any number of customers, which it keeps in an array. A customer object has name and address fields, as well as an array of the current movies the customer has checked out. A third "Driver" class has the main method which calls the other two classes. When a new customer is created, it is put into the array in an object of store, and written to disk in a file named with the customer's ID number.
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I hope that was reasonably clear. I'd appreciate any help. Thanks.

i would make the store a manager of the customer objects whose
responsibilities include read and writing the objects as well as caching
them.
here is some sample code for this.
public class Customer(){
int id;
/* the id field is the unique identifier for each Customer.
     this field should probably be our primary key in our database
     table. you don't have to use a number but whatever it is it
     needs to be unique */
boolean updated;
public Customer(int customerId){
    id = customerId;
    updated = false;
public int getCustomerId(){
    return id;
/* if the customer object has been changed and needs to flushed back
     to the database this returns true. */
public boolean needsFlushing(){
    return updated;
/* and your other methods go here... */
}and now for the Store...
public class Store{
private Customer[] cache;
public Store(){
    cache = new Customer[10];
    /* here i have hard coded as 10, you could change this or for more
       flexibility use a Vector or such. */
/* spin through the cache and return the matching customer. if the
     customer is not in the cache load it in the database. */
public Customer getCustomer(int customerId)throws SQLException{
    for(int j=0;j<cache.length;j++){
      if((cache[j]!=null)&&(cache[j].getCustomerId()==customerId)){
        return cache[j];
    Customer c = loadCustomer(customerId);
    addToCache(c);
    return c;
public void addCustomer(Customer c)throws SQLException{
    /* adds a new (non-existing customer) */
    saveCustomer(c);
    addToCache(c);
public void close()throws SQLException{
    /* flushes back any updated customers */
    for(int j=0;j<cache.length;j++){
      if((cache[j]!=null)&&(cache[j].needsFlushing())){
        saveCustomer(cache[j]);
    cache = null;
private Customer loadCustomer(int customerId)throws SQLException{
    /* here would be code for loading a customer object from the
       database that matches the customerId. */
    return new Customer(customerId);//temporary
private void saveCustomer(Customer c)throws SQLException{
    /* here would be the code for saving the customer c into the
       database */
private void addToCache(Customer c){
    /* this method adds the customer c to the cache. it may have to
       to remove an older customer from the cache to do this. i leave
       the algorithm for deciding this up to you */

Using constant values in SQL Loader control file

Hi,
I have a requirement where I need to migrate the data of 6 tables from MS Access into Oracle data base. I have written SQL Loader scripts so that I can create CSV files based on MS Access data and then migrate into Oracle. But in Oracle tables we have 4 common columns like Create_By, Created_Date,Updated_By and Update_Date, and those fields should be taken care by system. So, basically system should update login user ID and sysdate values in respective columns. My question here is, I do not have above mentioned common columns in MS Access tables. So, can I hard code those values in control file by saying
Created_By CONSTANT user,
Create_Date CONSTANT TO_CHAR(SYSDATE,'MM/DD/YYYY HH24:MI:SS'),
Updated_By CONSTANT user,
Updated_Date CONSTANT TO_CHAR(SYSDATE,'MM/DD/YYYY HH24:MI:SS')
Please let me know your valuable suggestions.

You do it without it constant
--sample data file
1,2,,
3,4,,
LOAD DATA
INFILE 'D:\d.csv'
INTO TABLE ABC
FIELDS TERMINATED BY ","
( A,
B,
C sysdate,
D "USER"
)Edited by: J99 on Jul 23, 2009 12:14 PM
OR use to avoid extra ',' in datafile.
--sample data file
1,2
3,4
LOAD DATA
INFILE 'D:\d.csv'
INTO TABLE ABC
FIELDS TERMINATED BY "," TRAILING NULLCOLS
( A,
B,
C sysdate,
D "USER"
)

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Creating custom mappings between objects

I currently have a db schmea that supports "soft" deletes. Example:
Client table has fields:
id - primary key (number)
name - varchar
active ("Y" or "N" where "Y" means active and "N" means "INACTIVE")
We also have a table Users:
id - primary key (number)
name - varchar
active ("Y" or "N" where "Y" means active and "N" means "INACTIVE")
When I delete a user I want to set its active field to "N" and then when
someone reads users from the client (after I have saved my changes) I want
only users whoses active field is "Y" to be returns, i.e.
Client clientA = <read client A>
Collection users = clientA.getUsers();
Is there a way to configure/customize the mapping/relationship between
objects?
Thanks!
Bruce

All of the emails are really my way of getting a soft delete to work. Does
KODO support this feature or is their a standard work around to support
this feature?
Thanks!
Bruce
Alex Roytman wrote:
You could break you collection into multiple mutually exclusive
subcollections (like active/inactive) and have your object model to map them
separately (via views with mutually exclusive criterion) When changing a
collection member's status you will need to move it from active collection
to inactive. Complete collection can be dode as dybamic (delegating)
composition of the subcollections (but it will cost twice as much to fetch
it)
Try to resolve your issues on object model level. I believe altering sql
mappings to make them very fancy will cause you lots of grief in the long
run
"Bruce" <[email protected]> wrote in message
news:[email protected]...
I also want to do something similiar to support object history. I could
have a Client object which gets modified and instead of editing this
object I would copy it, inactivate the copy and then edit the original.
This allows for full history. I can always select by active (or a more
complicated status) to get the rest of the history instead of the "top".
Views here seems like a hack. I have activew fields in all of my tables so
I would nee views for each table which is a lot to manage if fields are
changing (need to change them in both places). Also this creates issues
since views are really read-only.
Isn't there a way to change the SQL used to read a relationship?
Bruce
Alex Roytman wrote:
map your classes against views with (where active = 'Y') to make sure
"soft
deleted" records do not get read and have your object model to handlesoft
deletes (like removing from collections etc) use helper methods to do"soft
deletes" masking real deletes is not good idea - you will need them atsome
point
"Stephen Kim" <[email protected]> wrote in message
news:[email protected]...
While there is nothing default that does particularly what you desire,
but from my perspective, you should not have Kodo do anything by
default
as you will probably want to delete the inactive instances at somelater
point.
Instead you should look into Query.setCandidates:
http://www.solarmetric.com/Software/Documentation/2.4.3/docs/jdo-javadoc/jav
ax/jdo/Query.html
i.e. public Collection getActiveUsers ()
PersistenceManager pm = JDOHelper.getPersistenceManager
(this);
Query q = pm.newQuery (User.class, true);
q.setFilter ("active == "N"");
q.setCandidates (users);
return q.execute ();
I haven't tested the above code and there are a lot of optimizations
you
could do such as caching the query in a transient collection but Ithink
you get the idea.
You may want to post your thoughts on our newsgroups
(news://news.solarmetric.com) and see how other people are tackling
similar probles..
Bruce wrote:
I currently have a db schmea that supports "soft" deletes. Example:
Client table has fields:
id - primary key (number)
name - varchar
active ("Y" or "N" where "Y" means active and "N" means "INACTIVE")
We also have a table Users:
id - primary key (number)
name - varchar
active ("Y" or "N" where "Y" means active and "N" means "INACTIVE")
When I delete a user I want to set its active field to "N" and then
when
someone reads users from the client (after I have saved my changes)I
want
only users whoses active field is "Y" to be returns, i.e.
Client clientA = <read client A>
Collection users = clientA.getUsers();
Is there a way to configure/customize the mapping/relationship
between
objects?
Thanks!
Bruce
Stephen Kim
[email protected]
SolarMetric, Inc.
http://www.solarmetric.com

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I have tried the test case in my environment. It is working for me.
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Hi All,
I have to solve two kind of many to many relationships between Fact and Dimension.
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Relationship btween object in h.r

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Adding new constant value to an 'enum' used in a field causes an exception

We are using the DPL. I added a new constant to an enum that is used as a field on an entity called Booking (this field is not a key). This seems to cause an exception during onForeignKeyDelete when we delete an object from a related entity. The constraint is a "NULLIFY" on a "MANY_TO_ONE" relationship, so the effect should be just to nullify the Booking foreign key, but for some reason the fields are being checked and causing this exception. Shouldn't it be possible to add a new constant value to an enum without having to do some sort of migration? The stack is below. Note that the two types mentioned in the exception message are in fact the same (this is the enum). For the moment we can truncate our database, because we are still in development, but this would present a problem in production.
IllegalArgumentException: Not a subtype of the field's declared class com.chello.booking.model.BookingStatus: com.chello.booking.model.BookingStatus
at com.sleepycat.persist.impl.RawAbstractInput.checkRawType(RawAbstractInput.java:142)
at com.sleepycat.persist.impl.RecordOutput.writeObject(RecordOutput.java:75)
at com.sleepycat.persist.impl.RawAccessor.writeField(RawAccessor.java:232)
at com.sleepycat.persist.impl.RawAccessor.writeNonKeyFields(RawAccessor.java:148)
at com.sleepycat.persist.impl.ComplexFormat.writeObject(ComplexFormat.java:528)
at com.sleepycat.persist.impl.PersistEntityBinding.writeEntity(PersistEntityBinding.java:143)
at com.sleepycat.persist.impl.PersistKeyCreator.nullifyForeignKeyInternal(PersistKeyCreator.java:170)
at com.sleepycat.persist.impl.PersistKeyCreator.nullifyForeignKey(PersistKeyCreator.java:137)
at com.sleepycat.je.SecondaryDatabase.onForeignKeyDelete(SecondaryDatabase.java:1082)
at com.sleepycat.je.ForeignKeyTrigger.databaseUpdated(ForeignKeyTrigger.java:37)
at com.sleepycat.je.Database.notifyTriggers(Database.java:2016)
at com.sleepycat.je.Database.deleteInternal(Database.java:800)
at com.sleepycat.je.Database.delete(Database.java:714)
at com.sleepycat.persist.BasicIndex.delete(BasicIndex.java:133)
at com.sleepycat.persist.PrimaryIndex.delete(PrimaryIndex.java:206)
at com.sleepycat.persist.BasicIndex.delete(BasicIndex.java:124)
at com.sleepycat.persist.PrimaryIndex.delete(PrimaryIndex.java:206)
Kind regards
James Brook

James,
I've started investigating this and at first look it does appear to be a DPL bug. Over the next few days I'll look more deeply and report back here with what I find. If it is indeed a bug, we'll fix this for the next JE 4.0.x release and I'll make the fix available to you.
You are correct that adding enum values is allowed without a conversion of any kind. The only change you should have to make, other than adding the enum value, is to bump the version of the containing entity in the @Entity annotation. I'm suspect you've already done that, but if you hadn't, it wouldn't cause the problem you're seeing.
We have tested the addition of enum values, but not in combination with foreign key deletion and the NULLIFY constraint, I'm afraid.
If I'm correct about it, the bug is specific to adding enum values and deleting a secondary key with the NULLIFY constraint, prior to re-writing the entity in some other way. So if the entity is updated (written) before the secondary key is deleted, then the problem should not occur. Therefore, one workaround is to call EntityStore.evolve after adding the enum value, and before using the store in other ways.
Thanks for reporting this, and I hope this is not blocking your development.
--mark

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Steps what we are Done
1. Create the custom project from inactiveDC's
2.creating the project for the component crm/b2b in SHRAPP_1
3.After that we changed the application.xml and given the contect path.
4.Then we tried to add Dependency to the custom create DC we are getting the error saying that illegal deppendency : the compartment sap.com_CUSTCRMPRJ_1 of DC sap.com/home/b2b_xyz(sap.com.CUSTCRMPRJ_1) must explicitly use compartment sap.com_SAP-SHRWEB_1 of DC sap.com/crm/isa/ like that it was throwing the error.
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Regards
Satish

Hi
Please Ignore my above message.
Thanks for ur Response.
After ur valuble inputs we have added the required dependencies and sucessfully created the projects, then building of the projects was also sucessfully done and EAR file was created.
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In the Activity Log we are able to check the Activities as Suceeded but the Deployment column is not showing any status.
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Awaiting for ur valuble Responses..
Regards
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We created a new object type and related it to the position (S)and the job (C) object. In the customising (Personnel Management/Personnel Development/Basic Settings/Maintain Relationships there is an option to set up Additional Data. There are however several restrictions (e.g. the substructure has to be in T77AD). When you set up an existing substructure (e.g. PAD22) and screen (e.g. 3000), it works really well, however we have not been able to get this to read our own substructure and screen (since there is no customer include on HRP1001 and the 'Additional data' button seems to go to MP100100 to find the screen).
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Any assistance will be appreciated.
Regards
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Hi everyone
Thanks for everyone who tried to assist us with this. I am happy to report that our in-house guru's have found the answer. So, for anyone who is interested:
In programme MP100100 you have a screen 6000 which is a customer enhancements screen. We set up two in-house function modules for the PBO and PAI with its own screen and added an append structure to PAD31 to add the fields required. In the configuration, we then specified PAD31 as the substructure with screen 6000 and then also specified our own PBO and PAI function modules. The parameters required for screen 6000 is set up within our own customer screens.
Hope this will be helpful to someone - it certainly seemed to open up some doors for us!
Regards
Liezl

Custom: use constant value in relationship between objects?

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