Solved

Access increase by 1

Posted on 2009-04-05
11
564 Views
Last Modified: 2013-11-28
I have not found an exact answer in the exchange for my question, so I thought I would ask.  I have an access table which uses BATCH_NUM as the primary key.  We are now doing multiple tests on each batch in our lab.  I will add a value called LINE_NUM to this table.  I want LINE_NUM to start at 1 and then increment 1 for each additonal test on the batch.  So, in my form, lets say batch 1111 has it's first test and by default value property of LINE_NUM, LINE_NUM on the form shows 1.  Now, the next day I am going to run another test on batch 1111 and I want LINE_NUM to be a value of 2 for this test.  Can I use an expression or VB on the form to do this?  Something like select BATCH_NUM where BATCH_NUM = txtBATCH_NUM and then find the MAX of LINE_NUM and increment by 1?  Autonumber would work, but it would just keep increasing the number for all records, not by batch number.
0
Comment
Question by:etechit
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 4
  • 3
  • 2
  • +2
11 Comments
 
LVL 2

Expert Comment

by:pskeens
ID: 24074178

On event

Dim Lnum as Integer
Dim bnum as integer
Dim formbNum as integer

lnum = "SELECT max(LINE_NUM) FROM yourTable Where BATCH_NUM = formbNum"
bnum = Me.txtBATCH_NUM

txtLINE_NUM = bnum +1
0
 
LVL 30

Accepted Solution

by:
hnasr earned 500 total points
ID: 24074393
NextNumber = DMax("Field1", "Table1", "ID='value'") + 1
0
 
LVL 58
ID: 24076319
Just be aware that if multiple users can be working within a batch at the same time that Max/DMax may possibly hand out the same number if two users got to save at the same time.
If you have this situation, you'll need a key generation routine which has some type of lock built in so that only one user can be grabbing a key at one time.
JimD.
0
Application Discovery Service in AWS

In the era of the cloud, customers migrating away from their existing on-premise infrastructure. This requires lots of planning, strategies, and effort to identify their existing resources and determine how best to migrate.  Datacenter migrations happen in four phases -

 
LVL 11

Expert Comment

by:mildurait
ID: 24076913
You could  try something like this.

public sub txtBatchNo_AfterUpdate()

       If isnull(me.txtBatch_Num)=true then exit sub
       If isnull(me.txtLine_Num)=true then exit sub
       dim lastline as long
       dim sql as string
       sql = "SELECT TOP 1 LINE_NUM"
       sql = sql & " FROM TABLE"
       sql = sql & " WHERE BATCH_NUM=" & me.txtBatch_Num
       sql = sql & " AND LINE_NUM IS NOT NULL"
       sql = sql & " ORDER BY LINE_NUM DESC"
       dim rs as dao.recordset      
       set rs = CurrentDb.openrecordset(sql)
       if not rs.eof = false then lastline = rs.fields("LINE_NUM").value else lastline = 0
       rs.close
       set rs = nothing
       me.txtLine_Num = lastline+1
   
End sub

Note you will have to change TABLE to the actual name of your table.
0
 
LVL 11

Expert Comment

by:mildurait
ID: 24076923
...correction to above.
public sub txtBatch_Num_AfterUpdate()
0
 
LVL 1

Author Comment

by:etechit
ID: 24088848
mildurait;

Your example errors out on
Set rs = CurrentDb.OpenRecordset(sql)
0
 
LVL 1

Author Comment

by:etechit
ID: 24088871
hnasr;

Your example doesn't work as it has no idea of what the table name is.  I did insert my correct table name, but in troubleshooting my table name; tblLOG, says empty.
0
 
LVL 1

Author Comment

by:etechit
ID: 24088910
pskeens;

I get a type mismatch error on the first line
Lnum = "SELECT max(LOG_LINE_NUM) FROM tblLOG Where BATCH_NUM = formbNum"
0
 
LVL 30

Expert Comment

by:hnasr
ID: 24092630
Try to post a sample db!
0
 
LVL 11

Expert Comment

by:mildurait
ID: 24092758
@etechit      
Errors in all solutions here would point to the BATCH_NUM being of a non-numeric data type.
0
 
LVL 1

Author Comment

by:etechit
ID: 24093453
hnasr;
Your answer was correct, I was putting it in a Sub and not a Function.  It works!
0

Featured Post

Migrating Your Company's PCs

To keep pace with competitors, businesses must keep employees productive, and that means providing them with the latest technology. This document provides the tips and tricks you need to help you migrate an outdated PC fleet to new desktops, laptops, and tablets.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

You need to know the location of the Office templates folder, so that when you create new templates, they are saved to that location, and thus are available for selection when creating new documents.  The steps to find the Templates folder path are …
Microsoft Access is a place to store data within tables and represent this stored data using multiple database objects such as in form of macros, forms, reports, etc. After a MS Access database is created there is need to improve the performance and…
With Microsoft Access, learn how to specify relationships between tables and set various options on the relationship. Add the tables: Create the relationship: Decide if you’re going to set referential integrity: Decide if you want cascade upda…
With Microsoft Access, learn how to start a database in different ways and produce different start-up actions allowing you to use a single database to perform multiple tasks. Specify a start-up form through options: Specify an Autoexec macro: Us…

635 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question