Question

how do i represent null in coldfusion

Asked by: johndlz

hi i have a query that will select the invoice number in the quotation and will determine if that quotation has an invoice already. but i have a problem in my condition. this is my query: the problem is even if theres no value or the value is null for invoice it will still display my error message. how can i get rid of it. i want to delete quoatation where invoiceno =null. else cannot be deleted.




<cfparam name="attributes.code" default="">
<cfset lcerror =''>
<cfif qry_quotation.recordcount GT 0>
       <cfquery name="checkInvoice" datasource="#mydatasource#">
                   select invoiceno from quotation
                  where quotation_no = <cfqueryparam cfsqltype="cf_sql_varchar" value="#attributes.code#">
      </cfquery>
      <cfset invno ='#checkInvoice.invoiceno#'>
            <cfif checkInvoice.invoiceno NEQ 'NULL'  AND checkInvoice.recordcount GTE 1>
                  <cfset lcerror='<li class="error">Quotation-#attributes.code# cannot be deleted its been used by Invoice No.:#invno#</li>'>
            <cfelse>
                  <cfquery name="qry_deletequotation" datasource="#mydatasource#">
                        DELETE from quotation
                        WHERE
                        quotation_no = <cfqueryparam cfsqltype="cf_sql_varchar" value="#attributes.code#">
                  </cfquery>
                  <cfset lcerror ='<li>Quotation - #attributes.code# has been deleted.</li>'>
            </cfif>
      <cfelse>
            <cfset lcerror ='<li class="error">Quotation - #attributes.code# not found.</li>'>
</cfif>
<cfif lcerror NEQ ''>
<cfoutput><ul>#lcerror#</ul></cfoutput>
</cfif>

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Asked On
2006-07-31 at 00:28:54ID21937263
Tags

null

,

coldfusion

Topics

ColdFusion Application Server

,

ColdFusion Studio

Participating Experts
2
Points
150
Comments
3

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Answers

 

by: danrosenthalPosted on 2006-07-31 at 10:35:28ID: 17217509

I believe Coldfusion treats NULL values in query results as if they were no value (""), so in order to distinguish try a query like this:

      <cfquery name="checkInvoice" datasource="#mydatasource#">
               SELECT CASE WHEN invoiceno IS NULL then 'NULL' ELSE invoiceno END As invoiceno
               from quotation
               where quotation_no = <cfqueryparam cfsqltype="cf_sql_varchar" value="#attributes.code#">
     </cfquery>

 

by: gdemariaPosted on 2006-08-03 at 07:26:24ID: 17241922

In a coldfusion variable, NULL becomes an empty string.   So your CFIF statement could read...

          <cfif checkInvoice.invoiceno is not "" .....

    or some people feel this will run faster.. check to see if there is any length to the value

          <cfif len(checkInvoice.invoiceno) gt 0

    or this is equivalent...

          <cfif len(checkInvoice.invoiceno)>    <!---  if len > 0 then its "true"  if len is 0 its "false"  so no need to compare with "GT 0"  ---->


   Here's the code:

          <cfif  len(checkInvoice.invoiceno)  AND checkInvoice.recordcount>
               <cfset lcerror='<li class="error">Quotation-#attributes.code# cannot be deleted its been used by Invoice No.:#invno#</li>'>
          <cfelse>
               <cfquery name="qry_deletequotation" datasource="#mydatasource#">
                    DELETE from quotation
                    WHERE quotation_no = <cfqueryparam cfsqltype="cf_sql_varchar" value="#attributes.code#">
                    AND      invoiceno is NULL   <!---- as a failsafe, you can check during your delete ----->
               </cfquery>
               <cfset lcerror ='<li>Quotation - #attributes.code# has been deleted.</li>'>
          </cfif>


 By the way, try using cfthrow with cftry and cfcatch for error handling.  Less code and handles any problem, not just the one you specify.
 Gary

 

by: gdemariaPosted on 2006-08-04 at 12:41:34ID: 17252605


 Why the "B" score?  Did you need more information?

20120131-EE-VQP-002

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