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Coldfusion number generator using 4 digits, increment by 1

Posted on 2011-09-26
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Last Modified: 2013-12-24
I need example of code that will generate a 4 digit number increment by 1.
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Question by:smares32371
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Expert Comment

by:gdemaria
ID: 36601284

<cfset theNumber = 1000>

   incredment it by one...

<cfset theNumber = theNumber + 1>


  I have a feeling you want something more than that though...
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by:smares32371
ID: 36601895
That's true, in order for me to get a unique incremental number for every time the page is loaded, do I have to insert the number into db table in order to keep track of the count.
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by:_agx_
ID: 36602012
What is the number being used for? Just wondering if there's a reason you can't just use your database to generate the number ie (ms sql - identity, mySQL auto_increment, etc..). You could always pad the value on output so it's at leat 4 characters

     ie NumerFormat(yourNumber, "0000")
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Author Comment

by:smares32371
ID: 36602034
invoice number
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Expert Comment

by:_agx_
ID: 36602071
So far I don't see why you couldn't let your db generate the number. (In fact it's better not to roll your own when possible. As it's easy to create dupes.) Just pad the output as needed. If you prefer you could create a db view /or add a calculated column that does the padding automatically.

Which db type?
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Author Comment

by:smares32371
ID: 36602119
I'm sorry it just has to be a 4 digit random number sorry for the incremental part of it.
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Expert Comment

by:_agx_
ID: 36602125
Here's an example

Results
1, '00001', '2011-09-26 00:00:00', 'Test invoice A'
2, '00002', '2011-09-26 00:00:00', 'Test invoice B'
3, '00003', '2011-09-26 00:00:00', 'Test invoice C'

Sample Structure
<!--- sample table --->
<!--- note: You may want to plan ahead and use something bigger than SMALLINT --->
CREATE TABLE Invoices (
invoiceID smallint auto_increment primary key,
invoiceDate datetime,
Notes varchar(255)
)

<!--- add sample data --->
INSERT INTO Invoices (invoiceDate, Notes)
SELECT curDate(), 'Test invoice A' union all
SELECT curDate(), 'Test invoice B' union all
SELECT curDate(), 'Test invoice C'

<!--- create one time VIEW that includes "InvoiceNum" column padded to 5 zeros --->
CREATE VIEW vInvoices
AS
SELECT  InvoiceID, lpad(invoiceID, 5,'0') As InvoiceNum, invoiceDate, Notes
FROM   Invoices

<!--- display results --->
SELECT InvoiceID, InvoiceNum, InvoiceDate, Notes
FROM   vInvoices

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Expert Comment

by:_agx_
ID: 36602133
> I'm sorry it just has to be a 4 digit random number sorry for the incremental part of it.

Oh, okay. Then ignore my last post
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Accepted Solution

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gdemaria earned 500 total points
ID: 36602138
<cfset theNUmber = randRange(1000,9999)

will give you a random number
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Expert Comment

by:_agx_
ID: 36602182
You could use randRange() to generate a random number. Use NumberFormat to pad it to 4 characters.

             ie   <cfset randInvoiceNum = numberFormat(randRange(0, 9999), "0000")>

But you'll have to loop to ensure it wasn't used already.  Create a unique constraint on the table to prevent dupes. Then use a try/catch to detect a constraint violation (ie the number was already used). Keep looping until the INSERT succeeds.

<!--- Use unique constraint to prevent dupes --->
CREATE TABLE Invoices (
invoiceID smallint auto_increment primary key,
invoiceNum char(4) NOT NULL,
UNIQUE KEY ukInvoices_InvoiceNum (invoiceNum))
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Expert Comment

by:_agx_
ID: 36602188
> <cfset theNUmber = randRange(1000,9999)

Actually you can start at 0 or 1 and pad the results. So you don't skip the first 999 numbers.
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Expert Comment

by:_agx_
ID: 36602208
@smares32371 - Glad you found an easy solution.  I have a feeling the functions by category view might come in handy in the future ;-)
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