Location of linked table username/password

[Jason]

Greetings,

When you link a table from a password-protected data
source and select save the password, MS Access stores the
username and password in the string contained in
MSysObjects.Connect. However, if you do not make this
selection, where does Access store this information?

I am trying to avoid creating yet another password for our
users. By having them log into the existing Oracle
database, then stripping that log-in information out, I
can use that information for the functionality I am
building in this database.

Thank you for the information.

 

[Joe Fallon]

Not sure I get your question.
If you want to avoid a log-on screen then you need to connect to Oracle with
a hardcoded account that has the privileges you need. This code uses
variables but you can tweak it.

==============================================
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