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  1.  Home
  2. JAVA400-L
  3. September 2012

Dynamic Java for Excel Spreadsheet

Darren,

If it's a fit for your needs, we have a free utility that can generate
Excel and stream it to users via a browser.

http://www.mcpressonline.com/database/tech-tip-create-excel-spreadsheets-with-ibm-i-data.html

The issues I find when running from RPG are:
1) If writing to IFS, how does the end user easily get access to it.
Mapped drives tend to be clumsy.
2) Prompting, typically only a subset of records are desired, how do you
allow dynamic prompting.
3) Lot of redundent coding

FWIW - We have taken three different approaches to Dynamic Excel:
a) Dynamically generate a raw Excel via web based java and stream to
requestor. Useful when just basic data is desired in Excel format
b) Take a preformatted Excel file and dynamically update the excel data
and then stream to user.
c) From Excel, create a WYSIWYG excel complete with excel formatting,
graphs, etc and then use Excel Web Query to pull the db2 data

HTH Thanks, Paul Holm

www.planetJavaInc.com


message: 1
date: Fri, 28 Sep 2012 10:37:56 -0400
from: darren@xxxxxxxxx
subject: Dynamic java for Excel spreadsheet


We have run into various memory and performance issues using the JNI
interface from RPG to Java to generate spreadsheets using the POI HSSF
API's. Sometimes to get around this, we generate the spreadsheet in a
.CSV
format, but this obviously generates a pretty ugly output when imported
into Excel. I'm currently researching generating the java code
dynamically
in an RPG program, compiling it, and running that, meaning that the there
would be at least one java code source record for every cell on the
spreadsheet. I believe that the resulting program would perform much
better than the JNI interface does. Does anyone see any show stoppers
with
this approach? Anyone tried something like this before?



-

--
PlanetJ Corporation
Cell: 760-415-8830
www.planetjavainc.com


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

message: 2
date: Fri, 28 Sep 2012 12:03:25 -0400
from: Charles Wilt <charles.wilt@xxxxxxxxx>
subject: Re: Dynamic java for Excel spreadsheet

Why not take RPG out completely and just have a pre-written Java
program build the spreadsheets?

Charles

On Fri, Sep 28, 2012 at 10:37 AM, <darren@xxxxxxxxx> wrote:

We have run into various memory and performance issues using the JNI
interface from RPG to Java to generate spreadsheets using the POI HSSF
API's. Sometimes to get around this, we generate the spreadsheet in a
.CSV
format, but this obviously generates a pretty ugly output when imported
into Excel. I'm currently researching generating the java code
dynamically
in an RPG program, compiling it, and running that, meaning that the there
would be at least one java code source record for every cell on the
spreadsheet. I believe that the resulting program would perform much
better than the JNI interface does. Does anyone see any show stoppers
with
this approach? Anyone tried something like this before?

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

message: 3
date: Fri, 28 Sep 2012 12:39:31 -0400
from: darren@xxxxxxxxx
subject: Re: Dynamic java for Excel spreadsheet

There are a lot of reasons this would be difficult. My thought was to
create a service program to write the Java code to prevent a lot of the
downsides to converting code and developers to pure Java.





From: Charles Wilt <charles.wilt@xxxxxxxxx>
To: Java Programming on and around the IBM i
<java400-l@xxxxxxxxxxxx>,
Date: 09/28/2012 12:03 PM
Subject: Re: Dynamic java for Excel spreadsheet
Sent by: java400-l-bounces@xxxxxxxxxxxx



Why not take RPG out completely and just have a pre-written Java
program build the spreadsheets?

Charles

On Fri, Sep 28, 2012 at 10:37 AM, <darren@xxxxxxxxx> wrote:

We have run into various memory and performance issues using the JNI
interface from RPG to Java to generate spreadsheets using the POI HSSF
API's. Sometimes to get around this, we generate the spreadsheet in
a .CSV
format, but this obviously generates a pretty ugly output when imported
into Excel. I'm currently researching generating the java code
dynamically
in an RPG program, compiling it, and running that, meaning that the there
would be at least one java code source record for every cell on the
spreadsheet. I believe that the resulting program would perform much
better than the JNI interface does. Does anyone see any show stoppers
with
this approach? Anyone tried something like this before?

--
This is the Java Programming on and around the IBM i (JAVA400-L) mailing
list
To post a message email: JAVA400-L@xxxxxxxxxxxx
To subscribe, unsubscribe, or change list options,
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Before posting, please take a moment to review the archives
at http://archive.midrange.com/java400-l.

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

message: 4
date: Fri, 28 Sep 2012 11:57:53 -0500
from: "Theis, John (Information Technology)"
<John.Theis@xxxxxxxxxxxxxxxx>
subject: RE: Dynamic java for Excel spreadsheet

Write the java program using POI to wait on a data queue to get its
requests from. Then all the RPG programmers have to know how to do is put
an SQL string on a data queue. You'll probably want to pass other
parameters through the data queue, like the output file destination or the
email address to deliver it to.

-----Original Message-----
From: java400-l-bounces@xxxxxxxxxxxx [mailto:
java400-l-bounces@xxxxxxxxxxxx] On Behalf Of darren@xxxxxxxxx
Sent: Friday, September 28, 2012 11:40 AM
To: Java Programming on and around the IBM i
Subject: Re: Dynamic java for Excel spreadsheet

There are a lot of reasons this would be difficult. My thought was to
create a service program to write the Java code to prevent a lot of the
downsides to converting code and developers to pure Java.





From: Charles Wilt <charles.wilt@xxxxxxxxx>
To: Java Programming on and around the IBM i
<java400-l@xxxxxxxxxxxx>,
Date: 09/28/2012 12:03 PM
Subject: Re: Dynamic java for Excel spreadsheet
Sent by: java400-l-bounces@xxxxxxxxxxxx



Why not take RPG out completely and just have a pre-written Java program
build the spreadsheets?

Charles

On Fri, Sep 28, 2012 at 10:37 AM, <darren@xxxxxxxxx> wrote:

We have run into various memory and performance issues using the JNI
interface from RPG to Java to generate spreadsheets using the POI HSSF
API's. Sometimes to get around this, we generate the spreadsheet in
a .CSV
format, but this obviously generates a pretty ugly output when
imported into Excel. I'm currently researching generating the java
code
dynamically
in an RPG program, compiling it, and running that, meaning that the
there would be at least one java code source record for every cell on
the spreadsheet. I believe that the resulting program would perform
much better than the JNI interface does. Does anyone see any show
stoppers
with
this approach? Anyone tried something like this before?

--
This is the Java Programming on and around the IBM i (JAVA400-L)
mailing
list
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--
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------------------------------

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End of JAVA400-L Digest, Vol 10, Issue 82
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