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Problems with accessing fields in access table

Posted on 2003-11-04
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Last Modified: 2010-05-01
Grrrr.. This one is really annoying me! Here's the problem

I have a central data control bound to a contral table within a database (Employees2.mdb and SF2003 as the table). I have another data control that is used to access other tables in the same database. Basically, as soon as you create a new record in the SF2003 table, the CreateNewTable Function is called (shown below) that creates a new table (surprise surprise!) called FirstNameMiddleNameSurname (e.g. JoeSamBloggs). This is all well and good, but when I try adding a record to that table, it says "Item not in this collection". It is, Cos I put it there! Any Ideas why it cant find the fields in the table that i created only moments before?

Public Function EnterLeaveDates(FromDate As Date, FromTime As String, ToDate As Date, ToTime As String, LeaveEntryNumber As Integer)
    MainPage.LeaveControl.RecordSource = MainPage.EmployeeControl.Recordset!Firstname & MainPage.EmployeeControl.Recordset!MiddleName & MainPage.EmployeeControl.Recordset!Surname
    MainPage.LeaveControl.Database.OpenRecordset MainPage.EmployeeControl.Recordset!Firstname & MainPage.EmployeeControl.Recordset!MiddleName & MainPage.EmployeeControl.Recordset!Surname
    MainPage.LeaveControl.Recordset.AddNew
    MainPage.LeaveControl.Recordset!LeaveFromDate = FromDate                     'NB - error occurs here!
    MainPage.LeaveControl.Recordset!leavefromtime = FromTime
    MainPage.LeaveControl.Recordset!leavetodate = ToDate
    MainPage.LeaveControl.Recordset!leavetotime = ToTime
    MainPage.LeaveControl.Recordset.Update
    MainPage.LeaveControl.RecordSource = Testtable
End Function

Sub CreateNewLeaveTable(TableName As String)
    Dim dbs As Database
    ' Modify this line to include the path to Northwind
    ' on your computer.
    Set dbs = OpenDatabase("Employees2.mdb")
    ' Create a table with three fields and a unique
    ' index made up of all three fields.
    dbs.Execute "CREATE TABLE " & TableName _
        & "(LeaveFromDate DATE, LeaveFromTime CHAR, " _
        & "LeaveToDate DATE, " & "LeaveToTime CHAR, " _
        & "SickFromDate DATE, " & "SickFromTime CHAR, " _
        & "SickToDate DATE, " & "SickToTime CHAR, " _
        & "Reason Char, " & "DoctorsNote CHAR);"
    dbs.Close
End Sub


I would appreciate any suggestions!

Also, is there anyway you can list the fields in a table (i.e. list what it thinks the fields are)

thanks,
0
Comment
Question by:Ice123
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11 Comments
 
LVL 76

Expert Comment

by:GrahamSkan
ID: 9677888
Set a reference to Microsoft ADO xx for DDL and security

Dim cat As New ADOX.Catalog
Dim tbl As ADOX.Table
Dim cl As ADOX.Column
cat.Connection = Adodc2.ConnectionString
Set tbl = cat.Tables("MyTable")
For Each cl In tbl.Columns
Debug.Print cl.Name
Next
0
 

Author Comment

by:Ice123
ID: 9678636
have already got a refence to microsoft ADO xx for DLL and security,

The code you kindly gave me doesnt work though! doesnt like the cat.connection for starters

also, what am I supposed to change adodc2.connection string to?

thanks
0
 
LVL 76

Expert Comment

by:GrahamSkan
ID: 9678916
Sorry
Didn't test it
It should be cat.ActiveConnection.
The adodc2 is the second data control that you referred to. Since it is all one database, I would expect its ConnectionString to be the same as your first ConnectionString.

But...

I've just noticed

    Dim dbs As Database
   
which tells me that you are using DAO and not ADO. My general advice, if you are starting out on DB programming is to switch to ADO.

Do you have Access to look at your new table? If not, can you use the Add-in Visual Data Manager?

Meanwhile, I'll try to dig out some old DAO code which walks through table fields.
0
 
LVL 76

Expert Comment

by:GrahamSkan
ID: 9679052

Sub DAOListTableFields(DB As Database, TableName As String)
    Dim tdf As DAO.TableDef
    Dim fld As DAO.Field
    Set tdf = dbs.TableDefs(TableName)
    For Each fld In tdf.Fields
        Debug.Print fld.Name
    Next fld
End Sub
0
 
LVL 76

Expert Comment

by:GrahamSkan
ID: 9679089
I ran your CreateNewLeaveTable and it seemed to work OK.

How do you tell your second data control about the new table? Some .Refresh or .Requery might be needed.
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LVL 76

Expert Comment

by:GrahamSkan
ID: 9679143
Another point, before I go home. This might be a useful and interesting exercise, but I have doubts about a database design that needs a table per employee.
0
 

Author Comment

by:Ice123
ID: 9681260
Im now utterly confused. Thought I had it cracked, but no! Er ADO / DAO - dont know what the difference is (newbie to this whole thing!). Connectionstrings - I dont have one! All I did was place the data object on a form and link it to the database and a table! My second datacontrol is then told about the new table by

mainpage.leavecontrol.recordsource = "JoeSamBloggs"

but when I get to

mainpage.leavecontrol.recordset.addnew             'OK
mainpage.leavecontrol.recordset!leavefromdate    'This is where it says it cant find the field.

I still could not get either of the two code sets above to work!
0
 
LVL 76

Expert Comment

by:GrahamSkan
ID: 9684999
OK.
DAO (Data Access Objects) is a perfectly adequate technology, except that it needs a partner, RDO (Remote Data Objects) to use remote databases.
ADO(Active Data Objects) is now the current technology and combines the two.

Much of the code is the same. The first difference that strikes one is that the Database Object has been replaced by a Connection Object, which has a ConnectionString Property. This string is divided into sections by semi-colons. One essential section describes the database location and another describes the data provider, e.g. Access (Jet), Oracle etc. It can also contain password & user information.
This is a ConnectionString:
"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=D:\My Documents\Allwork\Domestic\freezer.mdb;"

It is possible to use both ADO and DAO in the same project (you are mainly using DAO, but have a refererence to ADOX (the DDL & security part). DDL (Data definition language) is used to examine and change the database structures; Tables, Fields - Columns in ADOX's terms, etc.
If you were to mix ADO and DAO, you would have to specify which one you mean when declaring which in objects with a common name:

Dim rs as DAO.Recordset.
or
Dim rs as ADODB.Recordset


The Control sets (Data control, grid etc) for DAO and ADO will not mix and match.

I'll look again at your specific difficulty now & come back later.
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LVL 76

Accepted Solution

by:
GrahamSkan earned 45 total points
ID: 9685110
I think you need some code like this:

Data2.RecordSource = TableName
Data2.Refresh
0
 

Author Comment

by:Ice123
ID: 9685639
GrahamSkan - you are a genius! The refresh bit was the one standing in my way! Thank you so much!

I would love to give you some more points for your time, especially describing the basics to me, however, I dont have any left! (Ill give you the 5 that I gained over night!)
0
 
LVL 76

Expert Comment

by:GrahamSkan
ID: 9685798
Thanks,
No problem with the points. Sorry I didn't see it right away.
0

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