Use CFLock around the insert to block any other person from using the same
code.
<cflock timeout="10" throwontimeout="Yes" name="DBInsert" type="EXCLUSIVE">
<cfquery name="GetNextKey" datasource="ds">
Select IsNull(Max(KeyColumn),0) + 1 as NextKey
from DataBase
</cfquery>
<cfset tNextKey=GetNextKey.NextKey>
<cfquery>
insert into DataBase
(KeyColumn,
Column1)
values
(<cfqueryparam value="#tNextKey#" cfsqltype="CF_SQL_INTEGER">,
ColumnData)
</cfquery>
</cflock>
Ray Thompson
Tau Beta Pi (www.tbp.org)
The Engineering Honor Society
865-546-4578
-----Original Message-----
From: Dawn Sekel [mailto:[email protected]]
Sent: April 23, 2009 12:10 PM
To: sql
Subject: Can you share a Coldfusion query to convert field to auto
increment?
Hi:
I have a customer whose programmer has vanished and he is trying to get his
application back on line. I'm an intermediate CF programmer and I've
managed to get everything working again except for one problem. His
database is hosted - and somehow, when he restored his application, the
fields in his database lost their autonumbering capability. I tried
creating the next number right before the insert by getting the max value of
the field and then adding 1 to it, and that works for the most part, but
occassionally, we are seeing the old "Violation of PRIMARY KEY constraint
'PK_TblTestAnswers'. Cannot insert duplicate key in object
'dbo.TblTestAnswers' - and I can't figure out why unless to users are
somehow hitting the same page at exactly the same time and clicking submit.
So the only thing I can think of to fix the problem is to recreate the
autoincrment key fields somehow.
Does anyone have any Coldfusion code to insert a new autoincrement key field
in to a MS SQL table and then remove the old one? Or is there a way to
modify a key field to autoincrement?
Thanks in advance for any advice.
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