RE: JAVA400-L Digest, Vol 3, Issue 17

[murali dhar <hydchap1@xxxxxxxxx>]

Joe/Paul,
I agree Java is write once and run anywhere but if you write a Java application 
with JT400 classes to read/write from 400 files and run it on the AS400 it will 
work fine,but next week if you want to run the same code on a UNIX, it wont 
work because the concept of AS400 objects is not known to other boxes.
Regards,
 


Paul Holm <pholm@xxxxxxxxxxxxxxxxx> wrote:
Murali,

>From my interpretation of your issues:

a. As Joe points, out JT400 will run on any java enabled platform.
b. If you want database independence, use of the jt400.jar JDBC driver only
will enable that. What we typically do is externalize the JDBC connection
URL and driver reference in initial parms so that they can be set without
code change. I.E. Your application is config at runtime with the JDBC
driver and connection URL to use; your classpath includes all JDBC driver
jar files that you will use. This enabled database independence while using
jt400.
c. The remote JDBC Driver will be somewhat slower than native because of the
network overhead however the difference is not that big.
a. DB Optimization can be critical. Are the correct access paths and
indexes there?
b. Do you optimally set the jdbc jt400 properties? Extended dynamic,
package cache, etc?
i.
http://publib.boulder.ibm.com/pubs/html/as400/v4r5/ic2924/index.htm?info/jav
a/rzahh/jdbcprop.htm
HTH

Thanks, Paul Holm

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Subject: JAVA400-L Digest, Vol 3, Issue 17

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Today's Topics:

1. RE: java-qtemp (Joe Pluta)


----------------------------------------------------------------------

message: 1
date: Mon, 10 Jan 2005 10:46:09 -0600
from: "Joe Pluta" 
subject: RE: java-qtemp

> From: murali dhar
>
> Hi Joe,
> we are not using JT400 as it is specific to AS400,any java code we
write
> on the AS400 needs to be platform independent,Using JT400 we can never
> freely port Java code to run on Unix.

This makes no sense to me. You're trying to use QTEMP, but you say that
JT400 is platform specific. There is nothing platform specific about
JT400, it runs on any platform. If you want your back end to be
platform specific as well, you use a factory class and generate a
different access object for each platform.

Joe



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