Implemeting a CustomItemReader / help

[MmarcoM]

hello all
i have this particular usecase that i need to implement using spring batch.

I Have to export a set of data to a file.

THe data that i need to export will come from a database, but need to be retrieved using a custom java bean. IN addition, the data retrieval process is not straightforward.
Here is how it goes:

1 - extract columnX and columnY from MyTable (this can return n rows)
2 - for each of the column extracted at 1), call MyService.query(x, y) to retrieve the data that will be exported

I am guessing that operation 1 and 2 will be done in two separate steps, but how can i pass the data between step 1 and step 2?
operation in step2 looks like a custom ItemReader (or ItemProcessor)....which needs to be invoked for every item retrieved at 1.

could anyone guide me on how to implement my batch correctly?

w/kindest regards
marco

[MmarcoM]

Hi
ok i thought about it, and i believe with a jdbcItemREader (which select data from db), an ItemProcessor (which queries my service) and an ItemWriter should do it

sorry for bothering

rgds
marco