I'm looking to iterate through a set of fields as part of a table that follow a specific format. The table contains N pairs of these fields (Var_1, Value_1, Var_2, Value_2, etc).
I need to iterate through these fields and extract the data to write it out to a text file. I'd like to use a loop, I'd rather not hardcode each field into my VBA as the fields will likely grow in time and not every field will be populated for every record. I guess if there was a way to "evaluate" a field when its name is dynamically created in a string, that would solve my problem.
So, for example...
For i = 1 to FieldCount
' Write data to each field
Initially I thought of something like this
For i=1 to FieldCount
myStr = "!Var_"+CStr(i) + " = " + "!Value_" + CStr(i)
WriteLine(myStr)
but course, it prints the text literally... any way to get Access to evaluate that text first?
Perhaps there is a better way to approach this entirely?
You can use your record set's Fields collection, and refer to the value of any individual field by referencing the field's name.
rs.Fields("field_name").Value
You can generally drop the explicit .Value since that's the field's default property.
Public Sub printFieldPairs()
Dim strSql As String
Dim db As DAO.Database
Dim rs As DAO.Recordset
Dim N As Long
strSql = "SELECT * FROM tblJoeS;"
Set db = CurrentDb
Set rs = db.OpenRecordset(strSql)
With rs
Do While Not .EOF
For N = 1 To 3
Debug.Print .Fields("Var_" & N) & " = " & _
.Fields("Value_" & N)
Next N
.MoveNext
Loop
End With
rs.Close
Set rs = Nothing
Set db = Nothing
End Sub
That's what I think you're asking for. However, if the number of field pairs grows, you will have to revise the table structure. So my inclination would be to use a different table structure.
row_identifier fKey fValue
1 Var_1 foo
1 Var_2 bar
1 Var_3 baz
2 Var_1 abcd
As suggested improvement to HansUp answer:
....
Dim fld as DAO.Field
For Each fld in rs.fields
debug.? fld.value
Next fld
Related
I need to loop through an Access query, find all the unique values from a field (in this case called UtilityDunsNumber), put them into an array and then run another query for each DunsNumber in that array and output a CSV file with all the records from that new query, then loop back through to create a file for each DunsNumber.
Here's the code I have thus far:
Private Sub Command0_Click()
Dim db As DAO.Database
Dim records() As DAO.Recordset
Dim duns() As String
Dim i As Integer
Dim fs As String
fs = "C:\TestECI\IN_572_COMPANY_" & Format(Now(), "yyyymmdd") & "_814EN01_"
Set records = db.OpenRecordset("SELECT * FROM qry_RequestECI")
'loop through records, get list of unique DUNS numbers
'get unique duns
For Each Record In records
If IsInArray(Record.UtilityDunsNumber, duns) Then
continue
Else
ReDim Preserve duns(1 To UBound(duns) + 1) As String
' add value on the end of the array
arr(UBound(arr)) = Record.UtilityDunsNumber
End If
Next
For Each UtilityDunsNumber In duns
Set records = db.OpenRecordset("SELECT * FROM qry_RequestECI WHERE UtilityDunsNumber =" & dun)
i = 2000
fs = fs & i & ".csv"
DoCmd.TransferText acExportDelim, , records, fs, True
i = i + 1
Next
End Sub
It is failing here:
Set records = db.OpenRecordset("SELECT * FROM qry_RequestECI")
with the error
"Can't assign to array"
Dim records() As DAO.Recordset
Here you're declaring an array of recordsets...
Dim records As DAO.Recordset
Is probably what you want.
There's a simplification that may or may not help. To get the list of Duns numbers, you can use
set DunsRS=db.openrecordset "select UtilityDunsNumber from qry_RequestECI group by UtilityDunsNumber"
And then you can loop through the list with
DunsRS.movefirst
do while not DunsRS.eof
dun = DunsRS.fields("UtilityDunsNumber").value
...
...
DunsRS.movenext
Loop
This might be enough to fix the problem - not sure without trying it.
I'm having an issue with a piece of VBA I've written for Access. I have a table with a concatenation field 'Concat' (string field) and field called 'Age' (integer field with numerical values).
There are another 61 fields (named '0','1','2'...'60' respectively) where the code needs to work though: I want the code to loop through and, per record entry - for the VBA to Dlookup using the Concat + age fields to another table (called: tbl_Final_Probabilities) and pull back a probability and populate each of these 61 fields with the correct probability. These fields are set up at a numerical field, data type as Single.
The code pulls the correct probability but when I try to update the record for that field at the code line: "rs.Fields(a) = b" (also highlighted in code), I get the error message: "Run time error '3164': 'Field cannot be updated'".
All help welcome on how I need to correct this please, the code used is below.
Punch and pie.
Code:
Dim rs As DAO.Recordset
Dim a As Integer
Dim b As Single
Dim lookup As String
Set rs = CurrentDb.OpenRecordset("SELECT * FROM tbl_Circuit_plus_prob")
For a = 0 To 60
If Not (rs.EOF And rs.BOF) Then
rs.MoveFirst
Do Until rs.EOF = True
rs.Edit
lookup = rs!Concat & (rs!age + a)
b = DLookup("Prob_Date", "tbl_Final_Probabilities", "Concat2 = '" & lookup & "'")
rs.Fields(a) = b '- CODE BREAKS DOWN HERE
rs.Update
rs.MoveNext
Loop
End If
Next a
rs.Close
Set rs = Nothing
Thanks in advance for any and all help.
You loop is turned inside out:
Dim rs As DAO.Recordset
Dim a As Integer
Dim b As Single
Dim lookup As String
Set rs = CurrentDb.OpenRecordset("SELECT * FROM tbl_Circuit_plus_prob")
If Not (rs.EOF And rs.BOF) Then
rs.MoveFirst
Do Until rs.EOF = True
rs.Edit
For a = 0 To 60
lookup = rs!Concat & (rs!age + a)
b = DLookup("Prob_Date", "tbl_Final_Probabilities", "Concat2 = '" & lookup & "'")
rs.Fields(a).Value = b
Next
rs.Update
rs.MoveNext
Loop
End If
rs.Close
Set rs = Nothing
Your code: rs.Fields(a) = b addresses the field with the index 'a' (which is 0 in the first loop), in your table, this is probably an auto increment field and therefore cannot be updated. If you want to write in the fields with the names '0','1',... use this syntax: rs.Fields(x + a) = b, where x is the number of fields+1 (because your loop starts with 0) in the table existing before your field '0'.
I have a large database that monitors employees attendance at training events. Each record is an employee, and there are (along with basic information) a hundred or so fields that represent training events over the last 10 years. These fields are all yes/no checkboxes and so are checked if the employee attended that workshop.
I have a form that allows viewing information for individual employees easily, but I want a dynamic list on this form that shows what events the currently selected employee attended.
So I want a list to see which fields are designated as true for the specified record.
Is there any way to do this? Been searching all day and can't find a solution. Thanks.
Maybe somthing like this, assuming that all boolean fields are relevant and field name is workshop name:
Public Function getWorkshops(ByVal strEmployee As String) as String
' Declare vars
Dim db as DAO.Database
Dim rs as DAO.Recordset
Dim lngFieldsCount as Long
Dim n as Long
Dim strWorkshops as string
Set db = CurrentDb() '
lngFieldsCount = db.TableDefs("myTable").Fields.Count ' Count number of fields to iterate through
Set rs = db.OpenRecordset("SELECT * FROM myTable WHERE employeeName LIKE '" & strEmployee & "';",DbOpenSnapshot)
Do While not rs.Eof
For n = 0 to lngFieldsCount -1 ' iterate through all fields
If TypeOf rs.Fields(n) is dbBoolean Then ' check if field is boolean
If rs.Fields(n) Then ' check if boolean is true
strWorkshops = strWorkshops & rs.Fields(n).Name & vbCrLf ' add field names to string, separated by linebreaks
End If
End If
Next n
rs.MoveNext
Loop
getWorkshops = strWorkshops 'Set result of function
'Clean up
rs.Close
Set rs = Nothing
Set db = Nothing
End Function
This returns the name of all true fields in a string, separated with linebreaks (not tested).
Using VBA, how can I search for a text string, for example "CHIR", in a table called "ServiceYES", in the field "Service".
After that, I would like to save the neighboring field for all the rows that "CHIR" exists in the table "ServicesYES". The "ServiceYES" table is below:
I basically, want to find all the "CHIR" in "Service" column and then save the names which are on the left of the CHIR, eg "FRANKL_L", "SANTIA_D" as an array.
Thanks for all your help in advance.
Start by creating a SELECT query.
SELECT Code_Perso
FROM ServicesYES
WHERE Service = 'CHIR';
Use SELECT DISTINCT Code_Perso if you want only the unique values.
Add ORDER BY Code_Perso if you care to have them sorted alphabetically.
Once you have a satisfactory query, open a DAO recordset based on that query, and loop through the Code_Perso values it returns.
You don't need to load them directly into your final array. It might be easier to add them to a comma-separated string. Afterward you can use the Split() function (assuming you have Access version >= 2000) to create your array.
Here's sample code to get you started. It's mostly standard boiler-plate, but it might actually work ... once you give it "yourquery".
Dim db As DAO.Database
Dim rs As DAO.Recordset
Dim strItems As String
Dim varItems As Variant
Set db = CurrentDb
Set rs = db.OpenRecordset("yourquery", dbOpenSnapshot)
With rs
Do While Not .EOF
strItems = strItems & "," & !Code_Perso
.MoveNext
Loop
.Close
End With
If Len(strItems) > 0 Then
' discard leading comma '
strItems = Mid(strItems, 2)
varItems = Split(strItems, ",")
Else
MsgBox "Oops. No matching rows found."
End If
Set rs = Nothing
Set db = Nothing
I tested this and it seems to work. This function will pull all records where ServiceYes='CHIR' and dump the Code_Person value into an array which it will return:
Function x() As String()
Dim rst As Recordset
Set rst = CurrentDb.OpenRecordset( _
"Select * from ServiceYES where Service='CHIR'")
Dim Arr() As String
Dim i As Integer
While rst.EOF = False
ReDim Preserve Arr(i)
Arr(i) = rst.Fields("Code_Person")
i = i + 1
rst.MoveNext
Wend
x = Arr
End Function
Sample Usage:
Debug.Print x()(0)
Paolo,
Here is something I threw together in a few minutes. You can add it to the VBA editor in a module. It uses a trick to get the RecordCount property to behave properly. As for returing the array, you can update the function and create a calling routine. If you need that bit of code, just post a comment.
Thanks!
Option Compare Database
Function QueryServiceYES()
Dim db As Database
Dim saveItems() As String
Set db = CurrentDb
Dim rs As DAO.Recordset
Set rs = db.OpenRecordset("SELECT Code_Perso, Service, Favorites " & _
"FROM ServiceYES " & _
"WHERE Service = 'CHIR'")
'bug in recordset, MoveFirst, then MoveLast forces correct invalid "RecordCount"
rs.MoveLast
rs.MoveFirst
ReDim Preserve saveItems(rs.RecordCount) As String
For i = 0 To rs.RecordCount - 1
saveItems(i) = rs.Fields("Code_Perso")
rs.MoveNext
Next i
'print them out
For i = 0 To UBound(saveItems) - 1
Debug.Print saveItems(i)
Next i
rs.Close
Set rs = Nothing
db.Close
Set db = Nothing
End Function
hi guys im trying to take the value of data(0)
and put it into say variable InvoiceNumber. I tried putting an image of my watch screen but i ended up not being allow. but here is what my watch screen would look like.
data
data(0)
data(0,1) 1
data(0,2) 2
data(0,3) 3
I have tried
dim InvoiceNumber as variant <br/>
invoiceNumber = data(0)
but i keep getting error. I dont know how to reference just the part of that array. any help would be greatly appreciated.
here is the full code for anyone that would like to see a little more.
Dim db As Database
Dim rs As Recordset
Dim data As Variant
Dim colummn1 As Variant
Dim obj As Object
Set db = CurrentDb
Set rs = db.OpenRecordset("select * from Table1")
'set obj = new object
While Not rs.EOF
'MsgBox (rs.RecordCount)
'MsgBox (rs.Fields.Count)
data = rs.GetRows(rs.Fields.Count)
Column1 = data.data(0)
Wend
rs.Close
db.Close
End Sub
Try
Column1 = data(0,0)
instead of
Column1 = data.data(0)
data contains a two-dimensional array. The fist index is the field number, the second index is the row number. Both start at zero. So data(0,0) is the first field of the first row. data(1,0) is the second field of the first row.
I would try to make an array of invoices by using a user defined type
Public Type Invoice
Nr As Variant
IssueDate As Variant
Total As Variant
'Or whatever your invoice contains
End Type
Public Sub TestGetRecords()
Dim db As DAO.Database
Dim rs As DAO.Recordset
Dim data As Variant
Dim numRecords As Long, i As Long
Dim Invoices() As Invoice
Set db = CurrentDb
Set rs = db.OpenRecordset("select * from Table1")
data = rs.GetRows()
rs.Close
db.Close
numRecords = UBound(data, 2) + 1
ReDim Invoices(0 To numRecords - 1) As Invoice
For i = 0 To numRecords - 1
Invoices(i).Nr = data(0, i)
Invoices(i).IssueDate = data(1, i)
Invoices(i).Total = data(2, i)
Next i
Debug.Print Invoices(0).Total
End Sub
An error in you solution is, that you placed GetRows in a loop. However, GetRows returns all the rows at once!
I am finding it a little hard to understand what you are trying to achieve.
You are reading an entire table of data into a recordset object, loading the fields of the recordset object into a two dimensional array and then trying to iterate through the array to output the results to a single variable (or a sum of array values).
Why don't you just use an SQL expression to extract the data directly from your table?
If we can assume you have a table of invoices (say ... "myInvoiceTable") with at least the following fields ...
invoiceID
invoiceValue
(and probably many others, eg. invoiceDate, clientID, etc.)
you can write an expression something like this
"SELECT SUM(invoiceValue) AS MyTotal FROM myInvoiceTable WHERE invoiceID > xxxx"
This might go into your VBA code like this.
Dim rst as Recordset
Dim strSQL as string
strSQL = "SELECT SUM(invoiceValue) AS MyTotal FROM myInvoiceTable WHERE invoiceID > 400" '-- use an appropriate WHERE clause if needed
Set rst = CurrentDb.Openrecordset(strSQL) '-- the rst object should contain a single value "MyTotal" which is the sum of the fields you are trying to access
MsgBox rst!MyTotal '-- use this value wherever you need to use it