What is the differene between class diagram and er diagram .....pls ex

what is the differene between class diagram and er diagram .....pls explain with examples

Diff btw Class Diagrams and ERD's:
Class diagrams and ERDs both model the structure of a system. Class diagrams
represent the dynamic aspects of a system: both the structural and behavioural features.
ERDs, depicting only structural features provide a static view of the system.
Elements of a class diagram:
>class
>association
>binary
>n-ary
>Aggregation
>Composition
>Generalization
>Dependency
>Realization
>Association Classes
Elements of Entity Relationship Diagrams:
>Entity - A data attribute is a property common to an entity.
Check this link
www.cdf.toronto.edu/~csc340h/summer/tutorials/TutorialClassERD.pdf
Regards,
Pavan.

Similar Messages

What is the differene between filter operation and NL semi join?

Hi, all.
The oracle is 10gR2 and 11gR2.
There are differences between filter operation and HASH/MERGE semi join in processing subqueries.
But I could not see the difference between filter operation and NL semi join?
(the only thing I know is that filter operation has caching mechanism, but I am not sure in case of NL semi)
What are the pros and cons of each of them?
Thanks in advance.
Best Regards.

>
The oracle is 10gR2 and 11gR2.
>
Those aren't 'version's. What are the 4 digit versions?
>
There are differences between filter operation and HASH/MERGE semi join in processing subqueries.
>
What are they? When you make a statement like that post the information (and links to it) that backs up your statement.
>
But I could not see the difference between filter operation and NL semi join?
(the only thing I know is that filter operation has caching mechanism, but I am not sure in case of NL semi)
>
We can't 'see the difference' either; you didn't post anything for us to look at.
>
What are the pros and cons of each of them?
>
Each of what? Again - you need to be as specific as possible if you want specific feedback.
Also, since you generally should not use hints in production code anyway what difference does it make what the differences are? Oracle will make the choice.
Without anything specific to comment on about all we can do is provide several links that talk about joins and how to produce and examine them. These are all from Jonathan Lewis's Scratchpad:
http://jonathanlewis.wordpress.com/?s=semi-join
http://jonathanlewis.wordpress.com/2010/12/20/index-join-4/
http://jonathanlewis.wordpress.com/2010/08/15/joins-mj/ -- merge joins
http://jonathanlewis.wordpress.com/2010/08/10/joins-hj/ -- hash joins
http://jonathanlewis.wordpress.com/2010/08/09/joins-nlj/ -- nested loop joings
http://jonathanlewis.wordpress.com/2011/06/08/how-to-hint-1/ -- how to hint for joins
Check out those articles. Pay attention to how, in each one, he doesn't just provide a text description but also provides code and explains the code.
In other words he provides all of the specific information needed to illustrate what he is talking about. That is what you need to do if you need help with a specific topic: provide the query, plans and output that you yourself are using as the basis of your question. That lets us see EXACTLY what you are talking about.

What is the diffrence between sap events and application events

Hi all,
what is the diffrence between sap events and application events.Can any one tell me with examples.
regards,

Hi,
Look at this,
System Events (Default)
The event is passed to the application server, but does not trigger the PAI. If you have registered an event handler method in your ABAP program for the event (using the SET HANDLER statement), this method is executed on the application server.
Within the event handler method, you can use the static method SET_NEW_OK_CODE of the global class CL_GUI_CFW to set a function code and trigger the PAI event yourself. After the PAI has been processed, the PBO event of the next screen is triggered.
The advantage of using this technique is that the event handler method is executed automatically and there are no conflicts with the automatic input checks associated with the screen. The disadvantage is that the contents of the screen fields are not transported to the program, which means that obsolete values could appear on the next screen. You can work around this by using the SET_NEW_OK_CODE method to trigger field transport and the PAI event after the event handler has finished.
Application Events
The event is passed to the application server, and triggers the PAI. The function code that you pass contains an internal identifier. You do not have to evaluate this in your ABAP program. Instead, if you want to handle the event, you must include a method call in a PAI dialog module for the static method DISPATCH of the global class CL_GUI_CFW. If you have defined an event handler method in your ABAP program for the event (using the SET HANDLER statement), the DISPATCH method calls it. After the event handler has been processed, control returns to the PAI event after the DISPATCH statement and PAI processing continues.
The advantage of this is that you can specify yourself the point at which the event is handled, and the contents of the screen fields are transported to the application server beforehand. The disadvantage is that this kind of event handling can lead to conflicts with the automatic input checks on the screen, causing events to be lost.
Hope u understood.
Thanks&Regards,
Ruthra.R

What is the diffrence between a javabean and EJB

hi!
what is the diffrence between a javabean and entreprise jvaabeans! i mean which are the uitilization featires of eaxh one !

i am seeking for a solution for my problem , in fact i ma trying to implement and develop an application with java that allows a certain range of IP adresses to be connected to a database server in order to extract the suitable data from the server .
let me explain mor ethe suitation , in fact what i am loking for is to use javabeans to grant my application much more consistence and pertinence : si i am asking if it could be possible to use javabeans in my case especially if i am not trying to developp a web application but a cleint /server one allowing some services.
The application is in fact dealing with a stock exchange market and what i am trying to do is to grant particilar registrated customers to have the informations that they need ( portofolio, currency's status, market indicators, .) also drawing some charts decribing rates, variations, and others specefic financial caracterestics .So , if we consider that this application is not a web application ( no HTTP request and no servers like apache or others ) how it is possible to use javabeans and not EJB to build the application? i mean what could be suitable and preferable to rely on and dvelop to ensure a good java application !!
if you need more details to help you find the answer for me don't hesitate to answer me back !!
Someone here gave me that answer
use RMI to code the services and (Updateable) Value Objects to pass the information between tiers.
RMI is an all-java distributed component framework (ie. EJB, CORBA, DCE/RPC, DCOM, etc.), that is very suitable for developing non-containerized multi-tier applications. Refer to the RMI trail in the Java Tutorial as a starting point for coding RMI solutions (http://java.sun.com/docs/books/tutorial/index.html). Under this scenario you would code the database access service as an RMI service (server-side). Client/server communication should be facilitated through the use of JavaBeans/classes that wrap the information being passed (customer information, portfolio details, market information, etc.) - these are refered to as 'Updateable Value Objects' (a design pattern). Graphing and charting would be handled in your client from the information received from the (RMI) server. GUI JavaBeans can be used to provide this functionality as well as other client-side services. There are numerous "shrink-wrapped" components for GUIs available on the market just peruse any Java magazine to find them.
but how comes? how can i do it !! and where can i find more information please about 'Updateable Value Object "
thanks

What is the difference between jsp :include and server side include

what is the difference between jsp :include and server side include(request dispatcher include method)????
i understand that both request dispatcher include method and jsp:include take dynamic data,so when would one use request dispatcher include and when jsp:include.
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do suggest if u hav ny other diff in this context...

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Hi folks,
Could you please explain me, "what is the difference between Instance variable and Global variable?"
Are they really same or not?
--Subbu

Hi flounder,
I too know that there is no such a term GLOBAL in java.
generally people use to say a variable which is accessible throught out the class or file has global access
and that will be called as a global variable...
my point is very much similar to what Looce said.
In simple that is not a technical term, but just a causual term.
In technically my question is, "What is the difference between a instance variable and public variable?".
Hi looce,
Thanks for the reply. even thats what my understanding too....in order to confirm that i raised this question..
Your reply has given a clear answer...... thanks again.
--Subbu

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and
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With Rgds
Arun J.Isaac

Oracle 11i is internet based and run with java platform where we can see the applets downloading alongwith oracle forms and it refreshes all the jar files in oracle default directory.
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Regards,
Arumugam S.

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Hi,
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What is the differene between class diagram and er diagram .....pls ex

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