Refresh of Oracle tables not working

[Dennis]

Access 2002 on Win2K....

When I go in to do a "global refresh" (Select All) of linked Oracle tables,
it *says* it refreshed successfully. (It does prompt me for the database
username and password, which I enter correctly.) However, when I attempt to
open a table after the refresh, I get the "ODBC connect failed" popup. If I
refresh JUST ONE table-link, it works. Then I can open that table. AFTER I
open that ONE refreshed table, *all* tables are now available. However, when
I exit Access and restart, it has forgotten ALL links except the ONE that I
did by itself. When I open that table, it opens fine. Then, once again, all
tables are accessible.

If I close the database (but leave Access running), then re-open that
database, all links continue to work. It's only when I CLOSE Access that it
loses the ODBC connection password. (At least, it appears to be the password
that gets lost.)

I have never seen this issue before. I worked this with an associate, who
believes it's some kind of permissions issue. But I am at a loss to determine
what permission(s) needs to be changed.

 

[Lynn Trapp]

You probably need to create a persistent connection to the table. You can do
this most simply by opening a form, in invisible mode if you don't need to
use the form right away, that has a connection to that table. Leave it open
throughout the session. That may get you on your way, anyhow.

 

[Joe Fallon]

I use this procedure to re-create links to Oracle at the push of a button:

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

 

[Dennis]

I guess the larger question is why doesn't the REFRESH LINKS function in
Access seem to keep the links active/on/whatever? Any ideas on that issue?

Thanks

I use this procedure to re-create links to Oracle at the push of a button:

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



--
Joe Fallon
Access MVP

Access 2002 on Win2K....

When I go in to do a "global refresh" (Select All) of linked Oracle
tables,
it *says* it refreshed successfully. (It does prompt me for the database
username and password, which I enter correctly.) However, when I attempt
to
open a table after the refresh, I get the "ODBC connect failed" popup. If
I
refresh JUST ONE table-link, it works. Then I can open that table. AFTER I
open that ONE refreshed table, *all* tables are now available. However,
when
I exit Access and restart, it has forgotten ALL links except the ONE that
I
did by itself. When I open that table, it opens fine. Then, once again,
all
tables are accessible.

If I close the database (but leave Access running), then re-open that
database, all links continue to work. It's only when I CLOSE Access that
it
loses the ODBC connection password. (At least, it appears to be the
password
that gets lost.)

I have never seen this issue before. I worked this with an associate, who
believes it's some kind of permissions issue. But I am at a loss to
determine
what permission(s) needs to be changed.