ColdFusion Validate a Number to Prevent Duplicates

Hello,  I have a ColdFusion form that I need to validate a unique casenumber in an Oracle Database "onBlur" or (somehow prior to the form being submitted to the database).  Can I do this with ColdFusion alone or will I need to incorporate JavaScript?   Is there a best method before I start coding?
trizzle29Asked:
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_agx_Connect With a Mentor Commented:
Yes, that is what I figured.   Then the try/catch is your best bullet proof option.
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trizzle29Author Commented:
Here is the textfield
<cfinput type="text"
name="casenumber"
size="30"
required="yes"
onvalidate="???"
message="Please enter your Project Case Number!">
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_agx_Commented:
Unique in what context?  ie
1. Unique in the Oracle database or ...
2. You have 4 fields and you need to verify they all contain a unique number?

If it is #1, the only bullet proof way to do that is within a database query. If #2, you can use javascript.
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trizzle29Author Commented:
Thanks for your response.
It is #1
With this method is it possible to verify in Coldfusion through query and have the response received (onBlur) prior to submitting the data to the database?  I am trying to prevent the client from entering a duplicate casenumber and receiving the coldfusion error since the casenumber is the primary key.
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_agx_Commented:
You could use some Ajax to preform a pre-check before submitting the form.  BUT  ... there is no guarantee the case number won't be used in between the time you do the check and do the database insert.  The only bullet proof way is put a cftry/cfcatch around the query to catch the constraint violation. Then display a message if the case number is already in use ie "Please try again"...
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trizzle29Author Commented:
I will try this and let you know how it turns out.
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_agx_Commented:
Okay.  I take it the Case Number is not something you can generate automatically. That would avoid the whole issue.
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trizzle29Author Commented:
Unfortunately the casenumber is assigned in a department that does not want to participate in the automation process.  
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