Incremental Numbers in CF...
As I was developing an app for a client that included an online ordering system I found I had a need to increase the purchase order number by one once the order was validated and inserted into the db. I searched for a solution to easily incrementing the numbers and found very few ideas. So after some experimenting this is what I used.
<!---First lock the transaction so as not it's not overwritten by another transaction. More on cftransaction --->
<cftransaction><!---Get the last number entered and increase it by one--->
<!--- Start - Get Last Number --->
<cfquery name="yourQuery" datasource="yourDSN">
SELECT MAX(ColumnName) as LastNumber
FROM yourTableName</cfquery>
<cfset NewNumber = yourQuery.LastNumber + 1>
<!--- End - Get Last Number --->Then insert your new entry before ending the cftransaction using the NewNumber as a reference.
</cftransaction>
It's nothing fancy, in fact probably a bit crude. But it works.
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