Question

(using Coldfusion8/MySQL5.0.88)

I’m storing JSON strings in a database. Strings consist of an id (key) and a number of items in a list (values).

Values look like this:

LOCAL.dropRecall = {"994323":"596895,596871,596864,596888,596840abc,596833,596826","991234":"9999,8888,abced"}

My problem is trying to delete a key/value pair. I’m trying like this:

<cfif  StructKeyExists(LOCAL.dropRecall,"#Session.id#")>
   <cfdump output="e:\dump.txt" label="catch" var="detected">
   <cfset StructDelete( LOCAL.dropRecall,"#Session.id#", "true")>
</cfif>

which correctly detects the key/value pair (detected is reported), but deleting it does not work.

Question:
What am I doing wrong? Why is the key/value pair not removed?

EDIT:
Ok. Found it. I queried the database for field items, set this to LOCAL.dropRecall and wrote items back into the database… so the structDelete worked, but I did not write the empty struct back to the database.

Answer 1

Check that the value of session.id is what you think it is (no extra whitespace or anything like that). I tried a modification if your code on CF8, and it works fine for me:

<cfset variables.id = 991234>
<cfset LOCAL.dropRecall = deserializeJson('{"994323":"596895,596871,596864,596888,596840abc,596833,596826","991234":"9999,8888,abced"}')>
<cfset LOCAL.safeCopy = duplicate(LOCAL.dropRecall)> 

<cfif  StructKeyExists(LOCAL.dropRecall,"#variables.id#")>
    <cfset StructDelete( LOCAL.dropRecall,"#variables.id#", "true")>
</cfif>
<cfdump var="#LOCAL#">

Does that code not work for you?