Danny,
Please see inline comments
I don't mean to frustrate you with these questions, but sometimes people
complain
of missing tables and then they say, "Ooops, there they are. Sorry, my
bad."
I hope I didn't give the impression of being frustrated. I'm grateful for
any help in solving this puzzle
I just wanted to make sure the tables were actually *gone* and not just
hiding.
From what you've said, they are gone. I've _never_ seen this happen and
I've
worked with hundreds, if not thousands of databases over the last dozen
years.
What do you think triggered the disappearance?
I'd been thinking of putting an Audit Trail on this database and had just
loaded the following into the modules tab, and then compiled the database.
*****Code Start*******
' Author: Allen Browne, (e-mail address removed), 2006.
' Purpose: Audit trail, to track Deletes, Edits, and Inserts.
' Does not audit any Cascading Updates/Deletes.
' Requirements: The table to be audited must have an AutoNumber primary key.
' Data entry must be through a form.
' Method: Makes a copy of the record in a temp table, and logs the
' change when it is guaranteed. The temp table copes with:
' - multiple deletes at once (continuous/datasheet view)
' - cancelled deletes or failed updates.
' - requirement for sequential numbering in the audit table.
' On a multi-user split (front-end/back-end) database, the
' temp table may reside in the front end, and the audit log
' in the back-end.
' Result: The audit table will contain one record for each deletion or
' insertion, and two records for each edit (before and after).
' Delete Copy of the deleted record, marked "Delete".
' Insert Copy of the new record, marked "Insert".
' Change: Copy of the record before change, marked "EditFrom".
' Copy of the record after change, marked "EditTo".
' This approach, together with the sequential numbering of the
' AutoNumber in the audit table makes tampering with the audit
' log more detectable.
'Note: Record confirmations need to be on. When opening the database:
' If Not Application.GetOption("Confirm Record Changes") Then
' Application.SetOption ("Confirm Record Changes"), True
' End If
Option Compare Database
Option Explicit
Private Const conMod As String = "ajbAudit"
Private Declare Function apiGetUserName Lib "advapi32.dll" Alias _
"GetUserNameA" (ByVal lpBuffer As String, nSize As Long) As Long
Function NetworkUserName() As String
'On Error GoTo Err_Handler
'Purpose: Returns the network login name
Dim lngLen As Long
Dim lngX As Long
Dim strUserName As String
NetworkUserName = "Unknown"
strUserName = String$(254, 0)
lngLen = 255&
lngX = apiGetUserName(strUserName, lngLen)
If (lngX > 0&) Then
NetworkUserName = Left$(strUserName, lngLen - 1&)
End If
Exit_Handler:
Exit Function
Err_Handler:
' Call LogError(Err.Number, Err.Description, conMod & ".NetworkUserName",
, False)
Resume Exit_Handler
End Function
Function AuditDelBegin(sTable As String, sAudTmpTable As String, sKeyField
As String, lngKeyValue As Long) As Boolean
'On Error GoTo Err_AuditDelBegin
'Purpose: Write a copy of the record to a tmp audit table.
' Copy to be written to real audit table in AfterDelConfirm.
'Arguments: sTable = name of table to be audited.
' sAudTmpTable = the name of the temp audit table.
' sKeyField = name of AutoNumber field in table.
' lngKeyValue = number in the AutoNumber field.
'Return: True if successful.
'Usage: Call from a form's Delete event. Example:
' Call AuditDelBegin("tblInvoice", "audTmpInvoice",
"InvoiceID", Me.InvoiceID)
'Note: Must also call AuditDelEnd in the form's AfterDelConfirm
event.
Dim db As DAO.Database ' Current database
Dim sSQL As String ' Append query.
' Append record to the temp audit table.
Set db = DBEngine(0)(0)
sSQL = "INSERT INTO " & sAudTmpTable & " ( audType, audDate, audUser ) "
& _
"SELECT 'Delete' AS Expr1, Now() AS Expr2, NetworkUserName() AS
Expr3, " & sTable & ".* " & _
"FROM " & sTable & " WHERE (" & sTable & "." & sKeyField & " = " &
lngKeyValue & ");"
db.Execute sSQL, dbFailOnError
Exit_AuditDelBegin:
Set db = Nothing
Exit Function
Err_AuditDelBegin:
' Call LogError(Err.Number, Err.Description, conMod & ".AuditDelBegin()",
, False)
Resume Exit_AuditDelBegin
End Function
Function AuditDelEnd(sAudTmpTable As String, sAudTable As String, Status As
Integer) As Boolean
'On Error GoTo Err_AuditDelEnd
'Purpose: If the deletion was completed, copy the data from the
' temp table to the autit table. Empty temp table.
'Arguments: sAudTmpTable = name of temp audit table
' sAudTable = name of audit table
' Status = Status from the form's AfterDelConfirm event.
'Return: True if successful.
'Usage: Call from form's AfterDelConfirm event. Example:
' Call AuditDelEnd("audTmpInvoice", "audInvoice", Status)
Dim db As DAO.Database ' Currrent database
Dim sSQL As String ' Append query.
' If the Delete proceeded, copy the record(s) from temp table to delete
table.
' Note: Only "Delete" types are copied: cancelled Edits may be there as
well.
Set db = DBEngine(0)(0)
If Status = acDeleteOK Then
sSQL = "INSERT INTO " & sAudTable & " SELECT " & sAudTmpTable & ".*
FROM " & sAudTmpTable & _
" WHERE (" & sAudTmpTable & ".audType = 'Delete');"
db.Execute sSQL, dbFailOnError
End If
'Remove the temp record(s).
sSQL = "DELETE FROM " & sAudTmpTable & ";"
db.Execute sSQL, dbFailOnError
AuditDelEnd = True
Exit_AuditDelEnd:
Set db = Nothing
Exit Function
Err_AuditDelEnd:
' Call LogError(Err.Number, Err.Description, conMod & ".AuditDelEnd()",
False)
Resume Exit_AuditDelEnd
End Function
Function AuditEditBegin(sTable As String, sAudTmpTable As String, sKeyField
As String, _
lngKeyValue As Long, bWasNewRecord As Boolean) As Boolean
'On Error GoTo Err_AuditEditBegin
'Purpose: Write a copy of the old values to temp table.
' It is then copied to the true audit table in AuditEditEnd.
'Arugments: sTable = name of table being audited.
' sAudTmpTable = name of the temp audit table.
' sKeyField = name of the AutoNumber field.
' lngKeyValue = Value of the AutoNumber field.
' bWasNewRecord = True if this was a new insert.
'Return: True if successful
'Usage: Called in form's BeforeUpdate event. Example:
' bWasNewRecord = Me.NewRecord
' Call AuditEditBegin("tblInvoice", "audTmpInvoice",
"InvoiceID", Me.InvoiceID, bWasNewRecord)
Dim db As DAO.Database ' Current database
Dim sSQL As String
'Remove any cancelled update still in the tmp table.
Set db = DBEngine(0)(0)
sSQL = "DELETE FROM " & sAudTmpTable & ";"
db.Execute sSQL
' If this was not a new record, save the old values.
If Not bWasNewRecord Then
sSQL = "INSERT INTO " & sAudTmpTable & " ( audType, audDate,
audUser ) " & _
"SELECT 'EditFrom' AS Expr1, Now() AS Expr2, NetworkUserName()
AS Expr3, " & sTable & ".* " & _
"FROM " & sTable & " WHERE (" & sTable & "." & sKeyField & " = "
& lngKeyValue & ");"
db.Execute sSQL, dbFailOnError
End If
AuditEditBegin = True
Exit_AuditEditBegin:
Set db = Nothing
Exit Function
Err_AuditEditBegin:
' Call LogError(Err.Number, Err.Description, conMod &
".AuditEditBegin()", , False)
Resume Exit_AuditEditBegin
End Function
Function AuditEditEnd(sTable As String, sAudTmpTable As String, sAudTable As
String, _
sKeyField As String, lngKeyValue As Long, bWasNewRecord As Boolean) As
Boolean
'On Error GoTo Err_AuditEditEnd
'Purpose: Write the audit trail to the audit table.
'Arguments: sTable = name of table being audited.
' sAudTmpTable = name of the temp audit table.
' sAudTable = name of the audit table.
' sKeyField = name of the AutoNumber field.
' lngKeyValue = Value of the AutoNumber field.
' bWasNewRecord = True if this was a new insert.
'Return: True if successful
'Usage: Called in form's AfterUpdate event. Example:
' Call AuditEditEnd("tblInvoice", "audTmpInvoice",
"audInvoice", "InvoiceID", Me.InvoiceID, bWasNewRecord)
Dim db As DAO.Database
Dim sSQL As String
Set db = DBEngine(0)(0)
If bWasNewRecord Then
' Copy the new values as "Insert".
sSQL = "INSERT INTO " & sAudTable & " ( audType, audDate, audUser )
" & _
"SELECT 'Insert' AS Expr1, Now() AS Expr2, NetworkUserName() AS
Expr3, " & sTable & ".* " & _
"FROM " & sTable & " WHERE (" & sTable & "." & sKeyField & " = "
& lngKeyValue & ");"
db.Execute sSQL, dbFailOnError
Else
' Copy the latest edit from temp table as "EditFrom".
sSQL = "INSERT INTO " & sAudTable & " SELECT TOP 1 " & sAudTmpTable
& ".* FROM " & sAudTmpTable & _
" WHERE (" & sAudTmpTable & ".audType = 'EditFrom') ORDER BY " &
sAudTmpTable & ".audDate DESC;"
db.Execute sSQL
' Copy the new values as "EditTo"
sSQL = "INSERT INTO " & sAudTable & " ( audType, audDate, audUser )
" & _
"SELECT 'EditTo' AS Expr1, Now() AS Expr2, NetworkUserName() AS
Expr3, " & sTable & ".* " & _
"FROM " & sTable & " WHERE (" & sTable & "." & sKeyField & " = "
& lngKeyValue & ");"
db.Execute sSQL
' Empty the temp table.
sSQL = "DELETE FROM " & sAudTmpTable & ";"
db.Execute sSQL, dbFailOnError
End If
AuditEditEnd = True
Exit_AuditEditEnd:
Set db = Nothing
Exit Function
Err_AuditEditEnd:
' Call LogError(Err.Number, Err.Description, conMod & ".AuditEditEnd()",
, False)
Resume Exit_AuditEditEnd
End Function
What was the last thing you did before missing them? See above
Could a user have deleted them?
No, at this point I'm the only user. Also the data is still there as it is
visible in the forms.Regards,
Iain, Pudsey UK
