Question

VB code in access database for validating the invoice no text field that user enters in the access form before submit

Asked by: sru578

Please help me I need help in writing VB code in MS Access database module.
 
I want to validate a form with the duplicate invoice no   ie.. User enters the duplicate  invoice number in the text box then, i should display a warning message saying Invoice number already exists in the database. The Invoice number in the database datatype is text field

Can you guys please help me writing a code for checking the duplicate value for invoice no and displaying error message ,otherwise proceed with the insert.
I am planning to write code in the event procedure

Private Sub NextInvoice_Click()

End Sub

Can you also explain how to attach a vb code to the command button or Text box and when to perform validation in the form

Regards,

srujana

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Asked On
2003-07-09 at 12:27:03ID20673519
Topic

Microsoft Access Database

Participating Experts
4
Points
120
Comments
10

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Answers

 

by: joekendallPosted on 2003-07-09 at 12:43:55ID: 8888274

You can write the code in the BeforeUpdate event of the text box. You can basically see if the invoice number exists in the table using one of the domain functions or querying the table yourself.

Something like this should get you going.

Private Sub txtInvoice_BeforeUpdate(Cancel As Integer)
Dim rs As DAO.Recordset
    Dim bClose As Boolean
    Dim bColor As Boolean
   
    Set rs = CurrentDb.OpenRecordset("SELECT * FROM tblInvoice WHERE InvoiceNbr = '" & txtinvoice & "'")
   
    If Not rs.BOF And Not rs.EOF Then
        MsgBox "Error - Invoice #" & txtinvoice & " already exists!"
        Cancel = True
    End If
   
    rs.Close
    Set rs = Nothing
End Sub

Thanks!

Joe

 

by: joekendallPosted on 2003-07-09 at 12:44:39ID: 8888282

The lines Dim bClose and bColor are not needed. Sorry for including them.

Thanks!

Joe

 

by: HaryMaryPosted on 2003-07-09 at 12:54:28ID: 8888388

I think you don't need to write a validation code where you can prevent the duplicate by modifying the design of the table. Change the field property (indexed property).

 

by: sru578Posted on 2003-07-09 at 13:15:05ID: 8888565

HaryMary,
If I set the Indexed property to Yes (Duplicates OK) selected. How will user know, that they entered the duplicate Invoice  no
Shouldn't I have to give the error message that Invoice Nu mber already exists.
Can you please  tell me should I write a code for Duplicate Invoice Number or not.
When I saw the database, Indexed property is already set to that.

 

by: sru578Posted on 2003-07-09 at 14:03:26ID: 8888987

Hi joekendall,
Thanks , I think I have to use your code to display an error message,
But When I copied your code an pasted and changed the table name and field names(FYI - My table name and Field name has spaces)
I am getting syntax error in the code ie in select statement
When i run the code
The error is
Run -time error '3075'
Syntax error(Missing Operator) in query expression 'Invoice No = '1800277''.

Please help me debug the code

Private Sub txtinvoice_BeforeUpdate(Cancel As Integer)
Dim rs As DAO.Recordset

 
   Set rs = CurrentDb.OpenRecordset("SELECT * FROM tblInvoice Primary WHERE Invoice No = '" & txtinvoice & "'")
   
   If Not rs.BOF And Not rs.EOF Then
       MsgBox "Error - Invoice #" & txtinvoice & " already exists!"
       Cancel = True
   End If
   
   rs.Close
   Set rs = Nothing
End Sub

 

by: joekendallPosted on 2003-07-10 at 04:04:10ID: 8891965

You need brackets around the Table name and the Field name.

Set rs = CurrentDb.OpenRecordset("SELECT * FROM [tblInvoice Primary] WHERE [Invoice No] = '" & txtinvoice & "'")

That is why it is a bad idea to include spaces in table and field names. If you ever decide to upsize to another database (Oracle, etc.), it can cause you alot of problems. It is best to include an underscore(_) for a space.

Thanks!

Joe

 

by: joekendallPosted on 2003-07-10 at 04:05:03ID: 8891970

You could set the field Invoice No to a Primary Key which would not allow duplicates.

Thanks!

Joe

 

by: nexusnationPosted on 2003-09-13 at 19:54:48ID: 9355444

This question has been abandoned and needs to be finalized.
  You can accept an answer, split the points, or get a refund (information at http:/help/closing.jsp)
  If you need a moderator to help you, post a question at Community Support (http:/Community_Support/)
PLEASE DO NOT ACCEPT THIS COMMENT AS AN ANSWER!
nexusnation, cleanup volunteer

 

by: jadedataPosted on 2003-12-03 at 11:51:48ID: 9869272

sru578,
No comment has been added lately, so it's time to clean up this TA.
I will leave a recommendation in the Cleanup topic area for this question:

RECOMMENDATION: split points between joekendall http:#8888274 and HaryMary http:#8888388

Please leave any comments here within 7 days.

-- Please DO NOT accept this comment as an answer ! --

Thanks,

jadedata
EE Cleanup Volunteer

20120131-EE-VQP-002

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