I wrote this function for handling NULLs.
<cfqueryparam cfsqltype="cf_sql_integer"
value="#arguments.CustomerBean.getGuarantor()#"
null="#IsNull(arguments.CustomerBean.getGuarantor())#" />
<CFFUNCTION NAME="IsNull" returntype="boolean" OUTPUT="false">
<CFARGUMENT NAME="Value" TYPE="String" REQUIRED="TRUE">
<CFSET var IsNull = FALSE>
<CFIF Trim(Arguments.Value) EQ "">
<CFSET IsNull = TRUE>
</CFIF>
<CFRETURN IsNull>
</CFFUNCTION>
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Callum McGillivray
Sent: Wednesday, July 13, 2005 8:24 PM
To: [email protected]
Subject: [CFCDev] Handling NULL's in a DAO
Hi all,
Just a very quick question.
I'm writing a DAO for a customer table using a SQL server database.
In the Update() method of the DAO, I have something like this;
<cffunction name="update" displayname="Update(CustomerBean
CustomerBean)" returnType="CustomerBean" output="false" hint="I update a
customer record in the Database.">
<cfargument name="CustomerBean" type="CustomerBean" required="true">
<cfset var ItemUpdate = "" />
<cfquery datasource="#dsn#" name="ItemUpdate" dbtype="odbc">
UPDATE customer
SET name = <cfqueryparam
cfsqltype="cf_sql_varchar" value="#arguments.CustomerBean.getName()#"
maxlength="40" null="no" />,
guarantor = <cfqueryparam
cfsqltype="cf_sql_integer"
value="#arguments.CustomerBean.getGuarantor()#" null="yes" />,
etc.. etc...
In the table that I am working with, there are a lot of fields that can
contain a NULL value, and when this is read in using the Read() method,
they are represented in CF as a zero length string.
When I am doing an update, do I reall have to use the following line of
code to set null values ?
UPDATE customer
SET name = <cfif
arguments.CustomerBean.getName() is ''><cfqueryparam
cfsqltype="cf_sql_varchar" value="#arguments.CustomerBean.getName()#"
maxlength="40" null="yes" /><cfelse><cfqueryparam
cfsqltype="cf_sql_varchar" value="#arguments.CustomerBean.getName()#"
maxlength="40" null="no" /></cfif>,
It seems a bit cumbersome and I was wondering if there is a better way.
Any thoughts would be appreciated.
Cheers,
Callum
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An archive of the CFCDev list is available at
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