DB2 lookup, Line by line processing via PI

Hello Experts,
I have a requirement. Using websphere middleware the consultants were able to read a huge file one line at a time. Do DB2 look ups for several fields, write JAVA code against the same for validation, summing up etc, write up error logs and finally create an output file. It had the following advantages:-
(1) The UI was good enough so that the business users could be shown examples of entering a string of values and the data fetched from various DB2 tables could be shown. In other others, an SE16 kind of functionality was possible. I could not find this in PI
(2) Line by line reading of a huge file greatly reduced stress on memory.
(3) Each field could be coded against which we can also do using custom UDF. Error log could be generated at each step.
All the requirements were met without having to write a big JAVA mapping program.
I am trying to see if the same is possible via PI inorder to the make the case for it @ my client place but have been unsuccessful so far. I do not want to use an ABAP mapping or JAVA mapping program
Could you please give some advice, pointers on the above points.
Thank you for your time.
Regards,
Minhaj.

PI is not meant for providing UI to business users, you need to use a UI tool (NWCE).
publish a service using PI and consume it in UI tool to show to business user.

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http://img530.imageshack.us/img530/16/sdngpgroup001bt5.jpg
Action grouping CO parameters into 2 groups
http://img147.imageshack.us/img147/2006/sdngpgroup002xy3.jpg
Process reflecting these groups as input parameters
http://img147.imageshack.us/img147/9184/sdngpgroup003pp0.jpg
Process started by java code above
http://img530.imageshack.us/img530/8833/sdngpgroup004no4.jpg
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