DAO to Access CMP - Ok not OK ?

Hi,
Form a desing point of view is it ok for DAO to fetch data from the CMP entity
bean.
Or DAO pattern is just for direct JDBC calls ?
Thanks

As the earlier Petstore prototype, there's a fastlane pattern.
with it, you can specify using EJB or not. the fastlane is used in DAO.
"Nadeem Akhter" <[email protected]> wrote:
>
Hi,
Form a desing point of view is it ok for DAO to fetch data from the CMP
entity
bean.
Or DAO pattern is just for direct JDBC calls ?
Thanks

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To CMP or not to CMP....that is the question!

Hey guys.
I have a problem which I am hoping you can help me solve.
Let's say that we are designing a simple J2EE address book web application.
The application design must follow these requirements:
1. The application stores all data in a relational database.
2. The user interface to the application is browser based only.
3. The application must be independent of the database type (Oracle, MS Sql, Informix).
4. The application must be independent of the application server type.
5. The application must be portable between databases and application servers.
The application allows the user to do the following:
A. Search for entries in the address book
B. Display (read only) entry details
C. Add/edit/delete entry
Now, what I'm wondering is: Should we use CMPs to encapsulate the address book entries,
or should we use Java classes with JDBC access to the database (managed through session beans).
I know that if we use CMPs, we don't have to code the database access calls.
Not only does this approach save us time, but it makes the bean portable across various database
servers.
But if we use CMPs, it seems to me that we face the following problem
(please correct me if I am wrong):
The application server creates tables in the database for storing the CMP data. The names of these
tables are not specified by the J2EE specification (because the persistent storage does not need to
be a relational database). Therefore if we deploy the application on application server A, and
then later decide to change to application server B, then B might have other naming rules for tables
than A (and would therefore be unable to read the data from the database).
Therefore, by using CMPs, our application is no longer portable between application servers, and
this violates design requirement number 5.
Now, I know that many application servers allow you to specify a mapping for CMP to an existing table,
but the configuration files for specifying these mappings are different between
application servers. And since we do not want our application to have to know anything about the
server it is to be deployed on, that solution is unacceptable.
Another way would be to implement the address book without CMPs, using Java classes with JDBC access
to the database (caching frequently accessed data, perhaps with the A.C.E. Smart Cache pattern).
My question is: What exactly is the tradeoff between these two implementations (in this limited web
access only context)?
Will the non-CMP implementation come in second in performance (and if so, why?)?
When the application server tier is clustered, does the application server synchronize the cached
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Any thoughts on the above issues are greatly appreciated.
Thanks.
OGG.

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In the title you state.
From my interanet I can access srvr but not from my home.
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I can access windows server from within interanet but don't know how to access it from internet.
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Message was edited by: WhidbeyTomas

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>
Prasanna Shanmugasundaram wrote:
> Hi,
> I have the File to JDBC scenario. The file is extracted in AL11 folder of the Sending (BW) system.
> The folder is FTP enabled and the Unix admin says he has given full authorization to both the folder and ftp user.
> But in the File CC I get the following error "Could not process due to error: com.sap.aii.adapter.file.ftp.FTPEx: 550 TSMSACAIX5350.tar.gz: The file access permissions do not allow the specified action."
>
> Can some one advice what is wrong. Im pretty much sure it has to be a problem with the UNIX permission. But the unix admin person says he has given a full permission.
> I need to know what permissions needs to be given?? Is there different permissions for application level and OS level??
>
> Pls advice
>
> Thanks
> Prasanna
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DAO to Access CMP - Ok not OK ?

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