I'm trying to create an ORM model for a new system I am designing, but I am having trouble figuring out how to model the problem domain. It's fairly strange...
You can post questions to this public form and get suggestions. It is best to express the model in facts and constraints with some narrative explaining them. ...
Hi, What's the status / state of the art of both inputting UML into ORM (1) and turning ORM into UML (2) ? thx, Luk Vervenne C Synergetics NV 2002 The...
Hi, I am very new to ORM (5 days since I heard about it for the first time, watching the ".Net Show"), and since this subject interests me very much, I am...
Sorry, maybe I was not very clear, I am refering to the model pictured at http://www.ormcentral.com/ORMBusinessDataObjects.htm Rodrigo ... me ... explanation...
Rodrigo, The circled I is not a constraint it is an index. It is not formally part of the constraints, but it did allow the conceptual model to map an index to...
Rodrigo, Ah, that is very different. The tiny circle is a ring constraint. The fact is "Person contacts Person". It is permitted to control how this works. For...
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Michael M. Gorman
mmgorman@...
Nov 28, 2002 5:28 pm
It would seem to me that an index is a formal declaration of an affiliation of a collection of "rows" from an "object" for some business purpose. Much the same...
Mike, I had never thought of it that way before. It was a physical thing. Just because that is the way it is in other tools. Now you suggest it is a grouping...
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Michael M. Gorman
mmgorman@...
Nov 28, 2002 8:17 pm
In the metabase we have the ability to have "Secondary Keys." These are value based, single-member collections of rows. Traditionally, they are manifest in...
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Scot A. Becker
scot@...
Nov 28, 2002 8:24 pm
Hi Rodrigo, ... That is an index "constraint" which would end up mapping as a non-unique index on the resulting column. Although this is clearly not a...
Thanks for the help everyone :) Is there a place where I can get some "challenging" ORM-related exercises, preferably with answers? -Rodrigo ... ===== "Give a...
When you get the book there are many problems with answers in the back. If you do them as you go it will help. You can also take a class that is ORM centric...
Mike In ORM the primary key is taken from the reference mode of Objects that map to a table, or a set of columns that are used as the primary reference of an...
Hi Pat ... I'm in the UK. Do you know of any organisation in Europe offering courses such as yours, or do you ever give ORM courses abroad? The MS course is...
Hi, I have one more "basic" question... I am modeling, as an exercise, a "Resume handling system"; so I have for a resume something like a "previous jobs...
Rodrigo - Today the answer is no - these are values constraints such as (<, > , <>, and so forth) Back many years ago now the earlier NIAM (ORM) is a child of...
The Alto reference is actually an agreement between them ourselves to use their facilities to hold local classes. We have taught in Europe, but if you contact...
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Scot A. Becker
scot@...
Dec 1, 2002 4:49 pm
Hi Rodrigo, ... The current tool doesn't support this constraint although previous flavors of ORM did. For now, you'll have to use a textual constraint to...
This reminds me of another question about handling ranges. If given entities Employee and Salary Grade, these facts apply... Salary Grade has Upper Bound and...
Hello, I am a final year student at LONDON Metropolitan university. Part of my final year project requires a comparison report on the two CASE tool packages...
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John Hanna
j.hanna@...
Dec 12, 2002 4:03 pm
One benefit of using ORM for conceptual modeling is that "elementary facts" provide a good basis for stating much of what is known about the "objects" that ...
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Lance Delano
lanced@...
Dec 12, 2002 4:13 pm
There are both algorithmic and manual ways of marking "important" objects. Unfortunately, the current software does not support either approach. ... From:...
John, This is a common point we have made fro some time and by critics of ORM. So, do not feel alone. One way that seems to work is to create a model page or...
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John Miller
jMiller@...
Dec 13, 2002 4:17 pm
The "whole" that you see, depends on your perspective. A business view of an ORM model is different from a relational view of the same model. Object importance...
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geverest@...
Dec 16, 2002 5:25 am
Lance, don't be so hard on yourself and the tool. It is obviously important to differentiate the level of importance of objects in an ORM diagram. I tell my...
Gordon, Lance, John We often use different pages to organize the presentation. Some pages have all the minor facts connected to a specific major object or two....
All, I forgot another option. You can create more than one model. You can share object between models (external object type). Then put all sub-models into the...
