Batch processing in Java: billing online purchases


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Hi everyone! I am writing my first serious batch processing application. The task is to create a bill from online purchases. The customers purchase data are stored in a database. I have to create an XML file from this data every day and save it some where.
So these are the steps that I think I should do:
- Get the data for every unique customer from the database for the past day. If customer has more than one purchase at the batching time, sum all the purchases.
- An XML file is created per each customer (The difficult part?)
- Mark into the database those purchases that are processed/billed (so that next day they are not processed again)
My quest

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Batch processing in Java: billing online purchases
Java
Hi everyone! I am writing my first serious batch processing application. The task is to create a bill from online purchases. The customers purchase data are stored in a database. I have to create an XML file from this data every day and save it some where.
So these are the steps that I think I should do:
- Get the data for every unique customer from the database for the past day. If customer has more than one purchase at the batching time, sum all the purchases.
- An XML file is created per each customer (The difficult part?)
- Mark into the database those purchases that are processed/billed (so that next day they are not processed again)
My quest

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