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Status Not under consideration
Workspace IBM i
Categories Languages - RPG
Created by Guest
Created on Apr 21, 2017

RELATED IDEAS

XML-INTO: Add new option to clear DS before loading

Add an option to XML-INTO that clears the DS before parsing the XML data into the DS. This option should work similarly to EVAL and other "assignment-type" functions.
Data Structures are typically used to temporarily store XML data prior to taking another action (writing to a file, calling another procedure, etc.). This action is often repeated/cylcled many times during execution of the program or procedure.
Why would any operation choose to leave data "remnants" in a program variable?

Example:
XML-INTO ItemsDS %XML(xmlfile: 'doc=file case-any clear=yes')


Use Case:

Amazon Marketplace Web Services (MWS) Order retrieval process uses XML payload

The API structure dictates that the client reqeusts the following:

1. ListOrders: Get a list of orders (XML-INTO loads response into Order DS)
2. ListOrderItems: For each order you must then reqeust a list of line items (read Order DS, ListOrderItems, XML-INTO loads response into Item DS)
3. At this point the DS data is written to Order Header and Order Detail tables
4. Upon reading the next order in Order DS and requesting the line items for that order, Item DS should be CLEARED prior to XML-INTO parsing the response into Item DS. Otherwise, Item DS still contains data elements from the previous order.


Idea priority Medium
  • Guest
    Reply
    |     May 30, 2017

    IBM does not intend to provide a solution to this request at this time, so it is being closed. XML-INTO is more like EVAL-CORR than the other assignment operations. (EVAL-CORR doesn't affect subfields that aren't in the source data structure.) Use the CLEAR opcode to clear the data structure before XML-INTO.

  • Guest
    Reply
    |     Apr 25, 2017

    With %HANDLER, the data structure to be passed to the handler is cleared before the parsing is done. So the issue only applies to the non-%HANDLER case.

  • Guest
    Reply
    |     Apr 25, 2017

    As stated the requirement can be met simply by coding appropriate INZ(s) on the DS. Not to mention avoiding using allowmissing=yes and adding appropriate countprefix options to deal with situations like this.

    I'm having trouble in seeing the value. The only time this is potentially an issue is when using %Handler because there you cannot code an INZ. But even then counts should handle it.

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