Design Objects with some common attribute/behavior. Is inheritance correct?

Hi,
In an application I am working on the domain/business layer has lots of domain objects. many of these domin objects aggregate to form other domain objects. Also in the application we have a class "User" that has the user information and privileges of the logged in "User."
When updates to the domain object have to be saved to the database we need this user information.
To make this we have created an AbstractDomainObject that has a private user and get and set methods.
All (almost all) domain objects in our system will extend from this Abstract DomainObject. So Contract, Shipment and Party all are domain objects and they extend AbstractDomainObject.
This way we do not need to code the get and set methods for user information in each object and also do not have to pass along the user object separately to the DataAccess layers.
But I think that this is wrong as we are using inheritance for code-reuse. (I have read about inheritance v/s composition) But it does save lot of code and any new domain object that gets written we have the user information available. (we have lots of domain objects)
Can somebody suggest what would be a better design with arguments that I could use to influence the other people in the team.
Thanks,

But that's easily accomplished through a simpleassociation.
No it would not. An association is a static
relationship, That's absolutely incorrect.
"The association shows the relationship between instances of classes"
http://pigseye.kennesaw.edu/~dbraun/csis4650/A&D/UML_tutorial/class.htm
You can Google on UML Association and find many other sites that say the same thing,
it would have the domain object using
the same credentials or have some messy code to match
each users' thead to their credentials.I have no idea what you are on about.
Why do you need to externalize the
internal state of the users credentials to dothis?
To preserve encapsulation.You don't need the memento pattern to do this.
Avoids the Domain object aquiring multiple
responsibilities.A simple association also does this.But it doesnt meat the OP's primary requirement.Of course it does. How doesn't it?
As far as I can tell, the
OP is just trying to figure out where to storethem.
If with 'store' you mean which class to holdthem.
I
agree.
Yes. Why does the internale state of the dataneed
to be externalized?To preserve encapsulation.What do you think externalized means in this context.
In the Memento Pattern
externalise means externalise properties fromthe
object encapsulating them.The point of the Memento Pattern is to externalize
the internal state of an Object such thatyou
can keep track of suceessive changes and reverse
them. Yes.
That doesn't apply here.The only alternative to externalisation is to violate
encapsulation and access them directly. You might
find that acceptable I dont.That's totally false. Unless you can explain how the memento pattern would be used here, I really don't think there is anymore to say. I've looked at the pattern a couple times since we started this discussion and nothing in it suggests it's applicable to this situation.

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Assigning sequential numbers to multiple rows with a common attribute

Oracle 10i, looking to modify a query to only select a total of 96 unique compoundnames and number each group of batchids 1-96.
Input
Table EX
Unique_ID, CompoundName, BatchID, Quantity
1, EX 1000, EX 1000 100, 100
2, EX 1000, EX 1000 101, 100
3, EX 1000, EX 1000 102, 100
4, EX 1001, EX 1001 100, 100
5, EX 1001, EX 1001 101, 100
6, EX 1001, EX 1001 102, 100
7, EX 1001, EX 1001 103, 100
8, EX 1001, EX 1001 104, 100
9, EX 1001, EX 1001 105, 100
10, EX 1002, EX 1002 100, 100
11, EX 1002, EX 1002 101, 100
12, EX 1002, EX 1002 102, 100
100+, EX 1095, EX 1095 100, 100
Using
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Select Unique_id, CompoundName, batchid, quantity, SUM(QUANTITY) over (partition by CompoundName) sumqty
FROM EX
where sumqty < 500
Order by 2,3;
Gives the data batched together by compoundnames and the total quantity of all the data sharing the same compound name (and only results whose total quantity is < 500).
I'm looking for a way to only grab 96 unique compoundnames (not total rows of data) at a time and numbering them to look like this desired output;
Unique_ID, CompoundName, BatchID, Quantity, SUM(Quantity), ???
1, EX 1000, EX 1000 100, 100, 300, 1
2, EX 1000, EX 1000 101, 100, 300, 1
3, EX 1000, EX 1000 102, 100, 300, 1
10, EX 1002, EX 1002 100, 100, 300, 2
11, EX 1002, EX 1002 101, 100, 300, 2
12, EX 1002, EX 1002 102, 100, 300, 2
100+, EX 1095, EX 1095 100, 100, 100, 96
Thanks in advance.
Edited by: user13112928 on Jun 26, 2010 11:49 AM
Edited by: user13112928 on Jun 26, 2010 11:50 AM
Edited by: user13112928 on Jun 26, 2010 12:01 PM

Hi,
If you want the numbers to be assigned only to the groups that remain after the groups where sumqty >= 500 or more have been excluded, then you have to assign the numbers after the groups where sumqty >= 500 or more have been excluded. All analytic funtions in the same sub-query are computed at the same time, so if you want to use analytic functions only, you have to do something like this:
SELECT DISTINCT
FROM     (
          SELECT      s.*
          ,     DENSE_RANK () OVER (ORDER BY compoundname)     AS rnk
          FROM     (
                    SELECT     Unique_id
                    ,      CompoundName
                    ,      batchid
                    ,      quantity
                    ,      SUM (quantity) OVER (PARTITION BY CompoundName)     AS sumqty
                    FROM     ex
               )     s
          WHERE     sum_qty     < 500
WHERE       rnk     <= 96
ORDER BY batchid
,       quantity
;Since analytic funtions are evaluated after the GROUP BY and HAVING clauses, you could also do it this way, with only one sub-query:
WITH     got_rnk          AS
     SELECT       CompoundName
     ,       SUM (quantity)               AS sumqty
     ,       ROW_NUMBER () OVER (ORDER BY CompoundName)     AS rnk
     FROM       ex
     GROUP BY CompoundName
     HAVING       SUM (quantity)     < 500
SELECT DISTINCT
       e.unique_id
,       e.CompoundName
,       e.batchid
,       e.quantity
,       r.sumqty
,       r.rnk
FROM       ex          e
,       got_r_num     r     ON     e.CompoundName     = r.CompoundName
WHERE       r.rnk     <= 96
ORDER BY e.batchid
,       e.quantity
;I'm not sure the latter will be any faster, since it needs to make two passes through ex.

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Hi,
At least one attribute is mandatory for a TYPE Object.
Attributes like a data structure and Methods like a legal operation on Attributes.
An object type is the closest thing to a class.
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Thank you David,
This is very close to what I need. When I test this on a standard HTML page it works flawlessly. It is an excellent bit of work.
When I try in integrate it into a Captivate 3 project using a "click box behavior" to call the JavaScript, it runs into a little trouble. The main part of the script works just fine: It is the “return document.MM_returnValue” piece that Captivate has problems.
For example:
When I use the JavaScript in a standard HTML page the URL string looks like this:
<a href="http://www.mywebsite.com" title="MyTest Window" onclick="dpSmartLink(this.href,'newWin',800,600,'z:z','sc');return document.MM_returnValue">Test link</a>
In Captivate I have to structure the call a little different. I can't use the href= piece, so I that part into the first parameter.
My Steps:
I embed the actual function in the HTML page used as a shell for the swf file.
In the Captivate Project file, on the slide where I want to call this function, I:
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For action I select “JavaScript”. (When the user clicks the "click box", execute javascript.)
The script call is written like this:
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Code: 0
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