ODBC Connection failed. Newbie question.


P

p-rat

I am very inexperienced on Access. I have a database using linked
tables from a SQL backend. Everyday that I log in to this database and
try to use the form that has data coming in from linked tables it says
'ODBC connection failed'. I then have to go to my Linked Tables
Manager and refresh the tables. I guess this wouldn't be a problem for
myself, but I need to have other 'clerks' use this database and
different locales. I have somebody in IT saying that I should
"hardcode" the connection string so it doesn't have to be on the
server. This is way over my head and I've gotten no help. I've
searched this group and have found code from Dev Ashish. I'm wondering
if there is a GOD could someone help me in this? I have NO clue on how
to proceed or where to put this if this would work, etc. Thanks ahead
of time for anyone who can help.


Function fRefreshLinks() As Boolean
Dim strMsg As String, collTbls As Collection
Dim i As Integer, strDBPath As String, strTbl As String
Dim dbCurr As DATABASE, dbLink As DATABASE
Dim tdfLocal As TableDef
Dim varRet As Variant
Dim strNewPath As String

Const cERR_USERCANCEL = vbObjectError + 1000
Const cERR_NOREMOTETABLE = vbObjectError + 2000

On Local Error GoTo fRefreshLinks_Err

If MsgBox("Are you sure you want to reconnect all Access tables?",
_
vbQuestion + vbYesNo, "Please confirm...") = vbNo Then
Err.Raise cERR_USERCANCEL

'First get all linked tables in a collection
Set collTbls = fGetLinkedTables

'now link all of them
Set dbCurr = CurrentDb

strMsg = "Do you wish to specify a different path for the Access
Tables?"

If MsgBox(strMsg, vbQuestion + vbYesNo, "Alternate data
source...") = vbYes Then
strNewPath = fGetMDBName("Please select a new datasource")
Else
strNewPath = vbNullString
End If

For i = collTbls.Count To 1 Step -1
strDBPath = fParsePath(collTbls(i))
strTbl = fParseTable(collTbls(i))
varRet = SysCmd(acSysCmdSetStatus, "Now linking '" & strTbl &
"'....")
If Left$(strDBPath, 4) = "ODBC" Then
'ODBC Tables
'ODBC Tables handled separately
' Set tdfLocal = dbCurr.TableDefs(strTbl)
' With tdfLocal
' .Connect = pcCONNECT
' .RefreshLink
' collTbls.Remove (strTbl)
' End With
Else
If strNewPath <> vbNullString Then
'Try this first
strDBPath = strNewPath
Else
If Len(Dir(strDBPath)) = 0 Then
'File Doesn't Exist, call GetOpenFileName
strDBPath = fGetMDBName("'" & strDBPath & "' not
found.")
If strDBPath = vbNullString Then
'user pressed cancel
Err.Raise cERR_USERCANCEL
End If
End If
End If

'backend database exists
'putting it here since we could have
'tables from multiple sources
Set dbLink = DBEngine(0).OpenDatabase(strDBPath)

'check to see if the table is present in dbLink
strTbl = fParseTable(collTbls(i))
If fIsRemoteTable(dbLink, strTbl) Then
'everything's ok, reconnect
Set tdfLocal = dbCurr.TableDefs(strTbl)
With tdfLocal
.Connect = ";Database=" & strDBPath
.RefreshLink
collTbls.Remove (.Name)
End With
Else
Err.Raise cERR_NOREMOTETABLE
End If
End If
Next
fRefreshLinks = True
varRet = SysCmd(acSysCmdClearStatus)
MsgBox "All Access tables were successfully reconnected.", _
vbInformation + vbOKOnly, _
"Success"

fRefreshLinks_End:
Set collTbls = Nothing
Set tdfLocal = Nothing
Set dbLink = Nothing
Set dbCurr = Nothing
Exit Function
fRefreshLinks_Err:
fRefreshLinks = False
Select Case Err
Case 3059:

Case cERR_USERCANCEL:
MsgBox "No Database was specified, couldn't link tables.",
_
vbCritical + vbOKOnly, _
"Error in refreshing links."
Resume fRefreshLinks_End
Case cERR_NOREMOTETABLE:
MsgBox "Table '" & strTbl & "' was not found in the
database" & _
vbCrLf & dbLink.Name & ". Couldn't refresh links",
_
vbCritical + vbOKOnly, _
"Error in refreshing links."
Resume fRefreshLinks_End
Case Else:
strMsg = "Error Information..." & vbCrLf & vbCrLf
strMsg = strMsg & "Function: fRefreshLinks" & vbCrLf
strMsg = strMsg & "Description: " & Err.Description &
vbCrLf
strMsg = strMsg & "Error #: " & Format$(Err.Number) &
vbCrLf
MsgBox strMsg, vbOKOnly + vbCritical, "Error"
Resume fRefreshLinks_End
End Select
End Function

Function fIsRemoteTable(dbRemote As DATABASE, strTbl As String) As
Boolean
Dim tdf As TableDef
On Error Resume Next
Set tdf = dbRemote.TableDefs(strTbl)
fIsRemoteTable = (Err = 0)
Set tdf = Nothing
End Function

Function fGetMDBName(strIn As String) As String
'Calls GetOpenFileName dialog
Dim strFilter As String

strFilter = ahtAddFilterItem(strFilter, _
"Access Database(*.mdb;*.mda;*.mde;*.mdw) ", _
"*.mdb; *.mda; *.mde; *.mdw")
strFilter = ahtAddFilterItem(strFilter, _
"All Files (*.*)", _
"*.*")

fGetMDBName = ahtCommonFileOpenSave(Filter:=strFilter, _
OpenFile:=True, _
DialogTitle:=strIn, _
Flags:=ahtOFN_HIDEREADONLY)
End Function

Function fGetLinkedTables() As Collection
'Returns all linked tables
Dim collTables As New Collection
Dim tdf As TableDef, db As DATABASE
Set db = CurrentDb
db.TableDefs.Refresh
For Each tdf In db.TableDefs
With tdf
If Len(.Connect) > 0 Then
If Left$(.Connect, 4) = "ODBC" Then
' collTables.Add Item:=.Name & ";" & .Connect,
KEY:=.Name
'ODBC Reconnect handled separately
Else
collTables.Add Item:=.Name & .Connect, Key:=.Name
End If
End If
End With
Next
Set fGetLinkedTables = collTables
Set collTables = Nothing
Set tdf = Nothing
Set db = Nothing
End Function

Function fParsePath(strIn As String) As String
If Left$(strIn, 4) <> "ODBC" Then
fParsePath = Right(strIn, Len(strIn) _
- (InStr(1, strIn, "DATABASE=") + 8))
Else
fParsePath = strIn
End If
End Function

Function fParseTable(strIn As String) As String
fParseTable = Left$(strIn, InStr(1, strIn, ";") - 1)
End Function
'***************** Code End ***************
 
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