How to capture number 0 in RouteOnAttribute

[#1]

Hi,

I have a requirement where-in I have to take a count(*) using selecthiveQL and if count is 0 then I have to insert a row. 

My flow is selectHive QL → RouteOnAttribute where in I am trying to capture the 0 

Json is as below:

[ {
"_c0" : 0
} ]

can some one please tell me how to capture this zero, I tried multiple ways but not able to. 

Also if anyone has better solution pls let me know. This is quite urgent. 

[#2 · Accepted solution]

@vamcits 

You can use EvaluateJsonPath processor to extract the 0 from the json you shared

You can name the custom property added above to whatever you like (I just used C0).
This will result in a "C0" attribute being generated on the FlowFile with a value of "[0]".

If you don't wan the square brackets around the number, you can remove them using an updateAttribute processor as follows:

Then you can perform your routing with the RouteOnAttribute processor.

Hope this helps,
Matt