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opening form locks table in access

on my open form event i am checking for the existence of columns in the underlying table:
the ideas was that if they all exist the form can get on and open. If a particular column didn't exist, i had hoped to close the form and create the fields which i tried with Each of the code segments work I am just not sure where to put them so that columns get created when necessary or if the columns exist the form opens.

Private Sub Form_Open(Cancel As Integer)
Dim a, b, c, d, e, f As Boolean
a = False
b = False
c = False
d = False
e = False
f = False

'   Me.Txt_Search_For.SetFocus
    'check fields in exportable and set boolean variables
    If CheckFieldExists("TblExportVinstems", "seq") = True Then a = True
 
    
    If CheckFieldExists("TblExportVinstems", "DoorsExtracted") = True Then b = True
    If CheckFieldExists("TblExportVinstems", "DVLACode") = True Then c = True
    If CheckFieldExists("TblExportVinstems", "CarwebCode") = True Then d = True
    If CheckFieldExists("TblExportVinstems", "VinConcat") = True Then e = True
    If CheckFieldExists("TblExportVinstems", "BodyDescription") = True Then f = True

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'check that all tables existed
If a And b And c And d And e And f = True Then
'open form
else

DoCmd.Close

Dim x As Boolean
' FAILS HERE AS FORM IS STILL OPEN AND TBL LOCKED ******************
If a = False Then x = CreateField("TblExportVinstems", "Seq", dbLong)

If b = False Then x = CreateField("TblExportVinstems", "DoorsExtracted", dbLong)

If c = False Then x = CreateField("TblExportVinstems", "DVLACode", dbText)


If d = False Then x = CreateField("TblExportVinstems", "CarwebCode", dbText)


If e = False Then x = CreateField("TblExportVinstems", "VinConcat", dbText)


If f = False Then x = CreateField("TblExportVinstems", "BodyDescription", dbText)
end if

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mbizup

Try using an intermediate form whose purpose is to run this code, close itself and open the other form.

Or start with a blank recordsource and set the recordsource through vba after running that code.

PeterBaileyUk

ASKER

i was just looking at autoexec but although i created the macro i am not sure how to edit the code

mbizup

I don't use macros much but I think there is a runcode command which lets you specify a function. Your code would have to be placed in a separate function in module outside of your form.

ASKER CERTIFIED SOLUTION

mbizup

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mbizup

The startup form of course shouldn't be bound to the table you are changing.

PeterBaileyUk

ASKER

great thx

Hamed Nasr

Current form (a) locks table for design.
Current form opens form (b), closes it self, frees table (a) for design.

Form (b) runs code in form_open event to modify table (a), runs form (a), closes it self.

As a side note:
But why do you need that?
I prefer to separate table design issue from from form design issue. This gives better control over data types and avoid accidental creation of unwanted fields/field names. This complicates database maintenance.