cfloop and dynamic variables from database - coldfusion

Question

I have a small form that loops from 1 to 30 and assigns variables. After these variables are saved to the database, I am having some trouble figuring out how to set the value of the input as the value from the database. Here is a some of my code.
<cfloop index="i"
from="1"
to="30">
<select name="supply_#i#"
id="supply_#i#"
/>
<cfloop query="GetDescriptor">
<option value="#GetDescriptor.Code#">
#GetDescriptor.Descriptor#
</option>
</cfloop>
</select>
<input type="text"
name="quant_#i#"
id="quant_#i#"
/>
</cfloop>
Once complete, the user saves all 30 values to the database. When they attempt to view or edit the form, I need to show the previously selected value. I really don't know how to "nest" coldfusion variables together, or if it is even possible, but here is an example of the VIEW/EDIT .cfm that does not work, but shows you what I am trying to accomplish with the values.
<cfloop index="i"
from="1"
to="30">
<cfset "supply_#i#" = #QUERY.supply#i##>
<cfset "quant_#i#" = #QUERY.quant#i##>
<select name="supply_#i#"
id="supply_#i#"
/>
<cfloop query="GetDescriptor">
<option value="#GetDescriptor.Code#"
<cfif #VARIABLES.supply_#i## EQ '#GetDescriptor.Code#'>
SELECTED="SELECTED"
</cfif> >
#GetDescriptor.Descriptor#
</option>
</cfloop>
</select>
<input type="text"
name="quant_#i#"
id="quant_#i#"
value ="#VARIABLES.quant_#i##"
/>
</cfloop>

Answer 1

I think the easiest way to accomplish this is to use array notation. That is, use brackets instead of dots. Since all variables scopes are structs you can do this.
variables["foo"]
is equivalent to
variables.foo
So in your case, you probably want to reference
#VARIABLES["supply_#i#"]#
or, perhaps
#VARIABLES["supply_" & i]#

Answer 2

(Too long for comments)
What is the actual structure of the db table the values are inserted into? The variable names suggest you are using a denormalized db design. If so, consider normalizing the structure and storing the data in rows (SupplyCode, Quantity), rather than columns (Supply1,Qty1,Supply2,Qty2,....). The normalized structure is a lot easier to query, and supports as many or as few entries as needed.
Simply query the table and use a query loop to display the existing values. Use currentRow in place of the index variable i:
<cfquery name="existingEntries" ...>
SELECT SupplyCode, Quantity
FROM YourTable
ORDER BY .....
</cfquery>
<cfloop query="existingEntries">
<select name="SupplyCode_#currentRow#" id="SupplyCode_#currentRow#">
<cfloop query="GetDescriptor">
<option value="#GetDescriptor.Code#"
<cfif existingEntries.SupplyCode EQ GetDescriptor.Code>
SELECTED="SELECTED"
</cfif>>
#GetDescriptor.Descriptor#
</option>
</cfloop>
</select>
<input type="text" name="Quantity_#currentRow#" value ="#existingEntries.Quantity#" .... />
</cfloop>
NB: Typically you would store a FK ID from the GetDescriptor table, ie "SupplyID" rather than a string code or description, ie "SupplyCode"