ODBC problem with linked tables

  • Thread starter Thread starter Ron bromwell
  • Start date Start date
R

Ron bromwell

I have an Access database that has linked tables to the
tables in my oracle DB. Every time I make a change to the
database and send it to the users, they have OBDC
failures until I re-link the tables. Any ideas on how I
can elevate this problem?
 
Probably if you set the database to "compact on close"
the problem will solve itself. Normally compacting
solves the problem just as well as relinking.

Linked tables save information about the table structure,
so it's not that you are doing anything wrong.

(david)
 
I always delete and re-create links.

Once it is working on a given workstation, they should be able to re-link
once and then just open it from then on.

Here is how I do it for Oracle:

I use this procedure to re-create links to Oracle.
There is a local Access table (tblODBCTables) that contains the table names
and primary key fields I want to link to on the Server.
Note: the source table name needs the Schema User prefix which is in the
code. The linked table name usually omits this.

Public Function LinkOracleTables(strDSN As String, strSchema As Variant,
strSchemaPwd As Variant) As Boolean
On Error GoTo Err_LinkOracleTables

Dim db As Database, rs As Recordset, tdfAccess As TableDef, qdf As
QueryDef
Dim dbODBC As Database, strConnect As String, strSQL As String

If strDSN = "" Then
MsgBox "You must supply a DSN in order to link tables."
Exit Sub
Else
strConnect = "ODBC;DSN=" & strDSN & ";UID=xyz" & ";PWD=abc;"
End If

SysCmd acSysCmdSetStatus, "Connecting to Oracle..."

Call DeleteODBCTableNames

Set db = CurrentDb
Set rs = db.OpenRecordset("tblODBCTables")
Set dbODBC = OpenDatabase("", False, False, strConnect)
DoCmd.SetWarnings False

Do While Not rs.EOF
Set tdfAccess = db.CreateTableDef(rs![LinkTablename], dbAttachSavePWD)
tdfAccess.Connect = dbODBC.Connect
tdfAccess.SourceTableName = strSchema & "." & rs![LinkTablename]
db.TableDefs.Append tdfAccess
'run pseudo index queries here. If the table does not exist then this
gets skipped.
strSQL = "CREATE INDEX " & rs![LinkTablename] & "Idx ON " &
rs![LinkTablename] & " (" & rs![IndexFields] & ");"
DoCmd.RunSQL strSQL
TableNotInCollection:
rs.MoveNext
Loop

LinkOracleTables = True

Exit_LinkOracleTables:
On Error Resume Next
DoCmd.SetWarnings True
rs.Close
Set rs = Nothing
Set dbODBC = Nothing
Set db = Nothing
SysCmd acSysCmdClearStatus
Exit Function

Err_LinkOracleTables:
Select Case Err.Number
Case 3151
MsgBox ("There is an ODBC datasource problem." & vbCrLf & "Please
verify the DSN and database are spelled correctly." & vbCrLf & "Note: They
can be case sensitive.")
Case 3265, 3011, 7874 'item not in collection - table does not exist, or
can't find object
Resume TableNotInCollection
Case Else
MsgBox "Error # " & Err.Number & " was generated by " & Err.Source &
vbCrLf & Err.Description, , "LogOnCode - LinkOracleTables"
End Select
LinkOracleTables = False
Resume Exit_LinkOracleTables

End Function

'This procedure deletes all linked ODBC table names in an mdb.
Public Sub DeleteODBCTableNames()
On Error GoTo Err_DeleteODBCTableNames

Dim dbs As Database, tdf As TableDef, I As Integer
Set dbs = CurrentDb
For I = dbs.TableDefs.Count - 1 To 0 Step -1
Set tdf = dbs.TableDefs(I)
If (tdf.Attributes And dbAttachedODBC) Then
dbs.TableDefs.Delete (tdf.Name)
End If
Next I

dbs.Close
Set dbs = Nothing

Exit_DeleteODBCTableNames:
Exit Sub

Err_DeleteODBCTableNames:
MsgBox ("Error # " & Str(Err.Number) & " was generated by " & Err.Source
& Chr(13) & Err.Description)
Resume Exit_DeleteODBCTableNames

End Sub
 
We do have the database set to compact and repair on
close. We also have links to SQL tables that we don't
have this trouble with.
 
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