Converting XML to CSV


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# 8  
Hi SDohmen,

nice to hear that you worked your way through and thanks for giving feedback.

Some comments:

Quote:
I was not aware that you could "backtrack" the tree and get the main info added to the product info.
That's why I pointed out XPath for you twice and presented you links for a good and short tutorial. Read the great manuals out there! Read it and you will be lesser dependant on others.

Quote:
cheated a bit as i got json data before the xml and i transformed it to the xml to actually get the proper data for it.
I would suggest to avoid that. With this step, the complexity of the task had risen for no good reason. I understand why you did it(just to get the task done - did that myself in the past), but I recommend to better invest the time to get the data out of the original format. That's most likely possible with jq - even if it needs the work to get familiar with jq. Otherwise you carry the increased complexity, increased error possibility, increased resource footprint with that task from now on.

An alternative to jq may be a small php script, that generates the csv

(...and sometimes a quick and dirty hack is just fine too)

That's the thing with jq:

Code:
jq -r <data.json ' .searchresults.data[] |
 . as $parent |
 .products[]  |
 ( $parent.idpurchaseorder+";"+.idproduct)'

Note: Those Pipes are part of the jq-filter - not shell pipes - carefully look at the quotes!

It's more like the approach that didn't work with xml. ;-)

Last edited by stomp; 6 Days Ago at 05:15 PM..
# 9  
Quote:
Originally Posted by stomp
Hi SDohmen,

nice to hear that you worked your way through and thanks for giving feedback.

Some comments:



That's why I pointed out XPath for you twice and presented you links for a good and short tutorial. Read the great manuals out there! Read it and you will be lesser dependant on others.



I would suggest to avoid that. With this step, the complexity of the task had risen for no good reason. I understand why you did it(just to get the task done - did that myself in the past), but I recommend to better invest the time to get the data out of the original format. That's most likely possible with jq - even if it needs the work to get familiar with jq. Otherwise you carry the increased complexity, increased error possibility, increased resource footprint with that task from now on.

An alternative to jq may be a small php script, that generates the csv.

If you like, show the original json...

(and sometimes a quick and dirty hack is just fine too)

That's the thing with jq:

Code:
jq -r <data.json ' .searchresults.data[] |
 . as $parent |
 .products[]  |
 ( $parent.idpurchaseorder+";"+.idproduct)'

It's more like the approach that didn't work with xml. ;-)



I did find those links you gave me but they where still a bit confusing and i would say limited in what i needed. Too be honest i did not have that much time either as i spend already almost a week on this with xmlstarlet alone.


As you mention this was a cheat but transforming the json to xml but this was also because i am severly limited in time and knowledge of jq. I actually did try a couple days and then i gave up because of the time constraints. Seeing your code however makes it look quite easy and even less fault sensitive. When i have some time i will actually try it out and let you know here about the (hopefully) success of the jq way.




I just tested jq but something seems not to work. I edited your piece of code to work with the json string:
Code:
jq -r <purchaseorders.json ' .data[] | 
 . as $parent |
 .products[]  |
 ( $parent.idpurchaseorder+";"+.idproduct)'


but this gave me an error:
Code:
jq: error (at <stdin>:0): number (376648) and string (";") cannot be added


Last edited by SDohmen; 6 Days Ago at 05:15 AM.. Reason: Tested jq
# 10  
Your json is different from mine. As the error message states numbers and strings cannot be added. You have to convert the number to a string before concatenating both:

Code:
... (number_var|tostring) + string_var ...

This User Gave Thanks to stomp For This Post:
# 11  
Quote:
Originally Posted by stomp
Your json is different from mine. As the error message states numbers and strings cannot be added. You have to convert the number to a string before concatenating both:

Code:
... (number_var|tostring) + string_var ...




Do you mean like:


Code:
jq -r <data.json ' .data[] |
 . as $parent |
 .products[]  |
 ( ($parent.idpurchaseorder|tostring)+";"+(.idproduct|tostring))'

I tested the above and this works indeed. When i have some time i will make the full line and see if that works also.



Again thank you for the help and pushing me towards the better solution instead of the workaround with xmlstarlet Smilie
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