Modules & VBA :: Dmax For Empty Table?
Apr 15, 2015
How do i use DMax() function instead of Autonumber, since the table is empty and it wont know what to do with Dmax() + 1 for next record?
E.g I have a new table Customer_details which contains
customerID
customerName
Age
now if i enter data through forms, i want the CustomerID to be incremental for each new record, so i can use Dmax() function. But since the table is empty how can i tell the form, through VBA that if it is null store 1 else store Dmax("CustomerID", "Customer_Details") + 1
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Jul 24, 2013
I just wondering if there is any way to Dmax more than one field? I found something and tried it but it does not seem to work.
Text13 = 10
Text15 = 5
I expected to get a result of just 10 but didn't
Code:
Dim Junk As Variant
Junk = DMax("[Text13] & ', ' & [Text15]", "Test")
MsgBox Junk
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Aug 8, 2013
after I insert a new record using INSERT INTO and then use DMax() (in a private sub) to look up the new record. About half the time DMax() pulls the new record based on the primary key field (AutoNumber) just fine. However, half the time it pulls the max record prior to the new record being inserted. I.e. record 1001 was added and DMax() pulls record 1000. I'm assuming that my issue has something to do with the timing of when the record is writen/saved in the table. Is there a simple method of refreshing the table that I can use prior to using DMax()?
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Sep 19, 2013
I need to use DMax to open the form on the last record based on the serial number. This code is what I have to open the form currently, but I want only the latest record related to the serial number:
Code:
DoCmd.OpenForm "Form1", , , "incoming_module_sn = '" & Me.txt_sn & "'"
Here is what I tried and it did not work:
Code:
DoCmd.OpenForm "Form1", , , DMax("incoming_module_sn", "tbl_module_repairs", "incoming_module_sn = '" & Me.txt_sn & "'")
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May 2, 2015
I have a form - purchase, and a subform purchase detail they are linked with a field "puid"..I need the dmax to give me the maximum auto number field "pdid" on the subform in a textbox on the mainform.
I used the control source code:
=DMax("[forms]![purchase]![purchasedetailds]![pdID]","[forms]![purchase]![purchasedetailds]","[Forms]![purchse]![purchasedetailds]![puid]=" & [Forms]![purchase]![puid])
and the simpler:
=DMax("purchasedetailds]![pdID]","[purchasedetailds]","[purchasedetailds]![puid]=" &[puid])
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Sep 23, 2014
I have a question concerning the automatically sequential numbering of a primary key as part of a composite primary key.
Tbl_treatment:
ID=numeric field (also in tbl_pt and in tbl_tumor)
Tumornr=numeric field (also in tbl_tumor)
Treatmentnr=numeric field
[ID] and [tumornr] are fixed and i would like to automatically number [treatmentnr] per [ID] AND [tumornr] in a way that the output will look like this:
1001 1 1
1001 1 2
1001 1 3
1001 2 1
1001 2 2
1001 3 1, etcetera.
However, when i use the SQL-formula below my output looks like this. It seems as if the function is not properly taking the composite primary key of [ID] AND [tumornr] into account or not finding the true max value:
1001 1 1
1001 1 2
1001 1 3
1001 2 2
1001 2 3
1001 3 3, etcetera.
If (DCount("[treatmentnr]", "Tbl_treatment", "[ID] = " & Me.ID & "" & "AND [tumornr] = " & Me.tumornr & "")) = 0 Then Me.treatmentnr = fRowNum(False)
Else Me.treatmentnr = (DMax("[treatmentnr]", "Tbl_treatment", "[ID] = " & Me.ID & "" & "AND [tumornr] = " & Me.tumornr & "")) + 1
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Oct 17, 2013
Anyway I've got a type mismatch that I can't figure out.
Code:
dMaxLstReq = DMax("reqNumb", "FlightLog", "Month([txtDate])='" & frmMonth & "'" And "Year([txtDate])='" & frmYear & "'")
In plain english: Select the highest value in the field named reqNumb from FlightLog where the Month of txtDate is equal to the variable frmMonth and the year of txtDate is equal to the variable frmYear.
txtDate is a Date/Time field in the table FlightLog
frmMonth and frmYear are both integer variables that take the system time (sysTime) and determine the month and year: I.E.
Code:
frmMonth = Month(sysTime) & frmYear = Year(sysTime)
Am I correct in thinking that the fact that my variables are integers and not times, that this is the cause of the mismatch?
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Mar 1, 2012
I am using DMAX to try to link a table to a from in access.
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Sep 17, 2014
I have a module for importing several excel files from a folder in Access. The user is prompted to select the folder which contains the Excel files.The issue:The code works fine if I select a folder from my company network drive (strFile variable returns with correct file name).The code does not work if I copy and paste the same folder to my desktop and select this location (strFile variable returns empty)
Code:
Option Compare Database
Private Sub btn_ImportData_Click()
Dim blnHasFieldNames As Boolean, blnEXCEL As Boolean, blnReadOnly As Boolean
Dim intWorkbookCounter As Integer
Dim lngCount As Long
Dim objExcel As Object, objWorkbook As Object
Dim colWorksheets As Collection
[code]....
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Sep 24, 2013
Why can't I get this simple piece of code to work?
Code:
Private Sub txtDateBack_AfterUpdate()
' updates loan status
txtLoaned = 0
If txtDateBack = Null Then txtLoaned = 1
End Sub
Code:
Private Sub txtDateBack_AfterUpdate()
' updates loan status
txtLoaned = 0
If txtDateBack = "" Then txtLoaned = 1
End Sub
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Jun 12, 2013
I use code to check folder as below.
If the folder not exists, then create it.
If dir(myfolder) = "" then
mkdir(myfolder)
end if
How to add code to check empty folder, like below?
If dir(myfolder) = "" then
mkdir(myfolder)
else if empty(myfolder) then //there is no empty function in access
do something
end if
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Aug 16, 2013
I'm trying to store all the OrderNumber + Item combinations in 2 arrays and then because the OrderNumber column really contains 2 values I'm interested in, I split it up and store that column's values in 2 arrays. So in total, I have 3 arrays. An array for Item, an array for Order, and an array for RepId (which is the one that I split up from the OrderNumber column).
Anyways, when I print the RepId array with the ' MsgBox PostValCol1(x) ' It prints 4 values like it's supposed to. But when I tested it again by looping through the values and just doing a MsgBox, It goes for a long time and that's because it has a lot of empty values in that array. How to get rid of those empty values/not store them in the first place?
Code:
Set rop = CurrentDb.OpenRecordset("Select OrderNumber, ItemNumber From dbo_EntryStructure Where (ProductNumber = '" & txtPartNumber & "') AND (ActionCode = 'I')")
While rop.EOF = False
ReDim Preserve ArrRepOrder(j)
ReDim Preserve ArrItem(j)
[Code] .....
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Jul 30, 2013
The overall goal is to hide a whole line of a report using "canshrink" on a series of boxes, some of which are numbers and some that aren't. Some will be blank when the data is loaded into the form and I want these to make the rest of the form adjust.
Code:
Private Sub Form_Load()
If Me.Label33.Value = "<1" Then
Me.Label34.Caption = "Nothing."
End If
End Sub
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Sep 12, 2014
I have a module that creates records into a contacts table in my access database. When there is no data in the field from outlook, the data is populated as an empty string "" instead of a null value, creating problems with subsequent queries and processes. I'd like to create the data as a null value but the module keeps failing with "object is required" on the statement
rstImport("Customer ID").Value = System.DBNull.Value
It doesn't seem to like System.DBNull.Value or DBNull.Value, and when I assign the vbNullString constant instead, it gets set to "" again and not null.
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Oct 14, 2014
Are new, empty record in form have recordset presentation, how to get recordset in form for empty row?
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Jan 17, 2014
I have a combo box which I define a SQL statement as its rowsource.
When I open the form, I have yet to define the SQL statement for the combo box.
My code is:
if me.cmbobox.listcount = 0 then
me.cmbobox.enabled = false
else
me.cmbobox.enabled = true
end if
But it shows the box as still enabled.
When I do debug.print me.cmbobox.listcount, it shows a value of 1. But that is impossible since I have yet to define a rowsource for it or its empty.
I also have column heading turned off too.
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Sep 19, 2014
I have a button that opens a form which is based on a query.
The query has a prompt so when you click the button the prompt pops up.
However if nothing is entered you get a VB error 94 error.
How do i get it to show a msgbox if the search is empty?
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Mar 4, 2015
One form. Several fields which are required using event 'On exit' - "If isnull" statements for each one.
Button on form to close said form...
Where on the form would I put the event for the button to override all other events?
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Feb 10, 2015
Our quotation tool, which is built in access 2003, has a memo field, which is extracted in a .txt file, to be uploaded by another system.
When the user starts the memo field with a blank line, by hitting the enter key, the upload file writes the memo field as a new line, separating it from the line indicator and thus giving errors.
My question would be : How would I determine in VBA, whether the first line of the memo field is blank.
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Oct 4, 2013
I'm an accountant and I'd like to build my own personal financial database in Access. One thing I like about MS Money is the 'Forecast Cashflow' feature, which is based on a schedule of recurring transactions, amounts, next due date, and frequency. I want to replicate this.
So, I created a dummy database for the sake of learning the code behind this process. I've got 2 tables (but no microphone.
1) tbl_InitialPoint (which is my schedule of recurring transactions, amounts, frequency (in days))
2) tbl_Register (where I want forecasted transactions to wind up)
I've got 2 saved queries:
1) qry_MaxDate (looks for any transaction @ 'tbl_InitialPoint' and finds the last date of that transaction in 'tbl_Register'
SELECT MAX(tbl_Register.PostDate) AS LastDate, tbl_InitialPoint.Description
FROM tbl_InitialPoint INNER JOIN tbl_Register ON tbl_InitialPoint.Description = tbl_Register.Description
GROUP BY tbl_InitialPoint.Description;
2) qry_InsertTransactions (populates 'tbl_Register')
INSERT INTO tbl_Register ( PostDate, Description, Amount )
SELECT qry_MaxDate.LastDate + tbl_InitialPoint.Frequency AS DateSeries, tbl_InitialPoint.Description, tbl_InitialPoint.Amount
FROM tbl_InitialPoint INNER JOIN qry_MaxDate ON tbl_InitialPoint.Description = qry_MaxDate.Description
WHERE qry_MaxDate.LastDate + tbl_InitialPoint.Frequency <= [Forms]![HomePage]![DateHorizon];
And I've got a form called 'HomePage' that has
1) A textbox where I input a date horizon (this is where I want the eventual 'Forecast Cashflow' to stop
2) A button to start the process
It seems to me that qry_InsertTransactions needs to be run over and over (looped) until the query is empty. And it seems to me that this can only be done via VBA (not sure if I could structure my SQL to avoid VBA in this case, but I need/want to learn the vba to accomplish this).
I'm having trouble getting VBA to run qry_InsertTransactions a single time. I'm pretty sure if I could get the thing to run once I could get it to run through a loop. So, here's what I came up with.
Public Sub InsertTransactionsBttn_Click()
Dim db As Database
Dim qdfNew As QueryDef
Dim qdfInsertTransactions As QueryDef
Set db = CurrentDb()
[Code] ....
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Aug 14, 2015
I need to import 300+ individual .txt files into a MS Access DB table (named "tbl_input"). Each of the the .txt files have a naming convention similar to this:
Pink_Floyd_YYYYMMDD.txt
Because this initial import is so large and I would like to avoid doing it manually, I need to be able to:
import each of these files into a single table
delimit the text in each based on the "|" symbol
add the filename into an empty field
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May 10, 2014
I'm working on a report. I have a text box that contains directory path for a picture which is showed in a image box on my report which works great. I have now created a label called "nopiclb" that has "no Pic "entered in it but I want to set the label to not visible if path1 has a file path in it but visible if path1 is empty
I put the code below in onformat event in the detail section, but is not working
Code:
Private Sub Detail_Format(Cancel As Integer, FormatCount As Integer)
If IsNull(Me.path1) = True Or Me.path1 = "" Then
Me.Nopiclb.Visible = True
Else
Me.Nopiclb.Visible = False
End If
End Sub
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Dec 12, 2005
I have the following problem:
I have a make table query that sum a total amount in order to have only the total in the table field.
However, when the total is 0.00, the make table query says "you are about to pos 0 rows" instead of postin 1 row with 0.00.
How can I set the query in order to have a 0 in the table when the total is 0 instead of having nothing posted ?
I have tried the is null, is empty, is missing, nz and nothing seems to work.
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Jun 12, 2007
i have a query with this basic structureSELECT id FROM table1,(SELECT SUM(field2) as total2 FROM table2) - (SELECT SUM(field3) as total3 FROM table3) as totalto understand better let's say that:table1 are clientstable2 is money that enters for clientstable3 is money that exits from clientsi want to obtain a balance. the problem is that if table2 or table3 has no records for certain client, this client is exluded from resultsany ideas?i tried using ISNULL like this:SELECT id FROM table1,ISNULL((SELECT SUM(field2) as total2 FROM table2),0) - ISNULL((SELECT SUM(field3) as total3 FROM table3),0) as totalbut it didn't workedthis is the querySELECT id, UPPER(apellido_titular) + ', ' + nombre_titular AS padre, (SELECT SUM(facturas_items.importe) AS totalf FROM facturas INNER JOIN padres ON facturas.id_padre = padres.id LEFT OUTER JOIN facturas_items ON facturas.id = facturas_items.id_documento WHERE (padres.id = p.id) AND (facturas.fecha_vencimiento < GETDATE())) - (SELECT SUM(recibos_items.importe) AS totalr FROM padres INNER JOIN recibos ON padres.id = recibos.id_padre LEFT OUTER JOIN recibos_items ON recibos.id = recibos_items.id_recibo WHERE (padres.id = p.id)) AS totalFROM padres pWHERE (activo = 1) AND ((SELECT SUM(facturas_items.importe) AS totalf FROM facturas INNER JOIN padres ON facturas.id_padre = padres.id LEFT OUTER JOIN facturas_items ON facturas.id = facturas_items.id_documento WHERE (padres.id = p.id) AND (facturas.fecha_vencimiento < GETDATE())) - (SELECT SUM(recibos_items.importe) AS totalr FROM padres INNER JOIN recibos ON padres.id = recibos.id_padre LEFT OUTER JOIN recibos_items ON recibos.id = recibos_items.id_recibo WHERE (padres.id = p.id)) > 0)ORDER BY UPPER(apellido_titular) + ', ' + nombre_titularsorry for my poor english
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Oct 6, 2004
Can anyone guide me to how to code a form that will not error when closed if nothing has been input to the first field which has the focus? I have a start up form that has fields connected to a table and if this database is open and the user desides not to use it then closes it without entering any data it will error. Is this a recordset issue? Thanks
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Aug 1, 2005
Is anybody can help me to solve problem with inserting empty record between two records in unordered (non-indexed) table - like in Excel work sheet.
Regards,
Gennady
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