Linking access tables? - .NET Framework

Is there any way to programmaticall y link access tables using vb.net

Jul 21 '05 #1

6004

What do you mean by Linking as this is an Access term to mean "getting data
from another database application"
"Job Lot" <Jo****@discuss ions.microsoft. com> wrote in message
news:09******** *************** ***********@mic rosoft.com...

Is there any way to programmaticall y link access tables using vb.net

Jul 21 '05 #2

Job Lot

Hi John

I am not talking about relationships. I want to create a link to a table
which belongs to a separate mdb. In access we right click in Tables windows
and use â€œLink Tablesâ€ option to create a link to table which resides in some
other db.

Is it possible to create such link programmaticall y?

"JohnFol" wrote:

What do you mean by Linking as this is an Access term to mean "getting data
from another database application"
"Job Lot" <Jo****@discuss ions.microsoft. com> wrote in message
news:09******** *************** ***********@mic rosoft.com...
Is there any way to programmaticall y link access tables using vb.net

Jul 21 '05 #3

JohnFol

..Net assemblies are NOT MDB files, nor does Access use .Net hence why the
comment does not make sense.

To perform the equivalent of a right click in the tables window, open the
Server Explorer, right click Data Connections and add new connection. You
can then navigate to the MDB.

To programatitcall y do this look at the ADO.Net documentation and look for
OleDBConnection

"Job Lot" <Jo****@discuss ions.microsoft. com> wrote in message
news:FD******** *************** ***********@mic rosoft.com...

Hi John

I am not talking about relationships. I want to create a link to a table
which belongs to a separate mdb. In access we right click in Tables
windows
and use "Link Tables" option to create a link to table which resides in
some
other db.

Is it possible to create such link programmaticall y?

"JohnFol" wrote:
What do you mean by Linking as this is an Access term to mean "getting
data
from another database application"
"Job Lot" <Jo****@discuss ions.microsoft. com> wrote in message
news:09******** *************** ***********@mic rosoft.com...
> Is there any way to programmaticall y link access tables using vb.net

Jul 21 '05 #4

Paul Clement

On Thu, 6 Jan 2005 16:19:01 -0800, "Job Lot" <Jo****@discuss ions.microsoft. com> wrote:

¤ Is there any way to programmaticall y link access tables using vb.net

Yes, you can use ADOX (Microsoft ADO Ext 2.x for DDL and Security) via interop. The below example
links to a table in an Access database:

Sub CreateAttachedA ccessTableWithA DOX()

Dim ADOXTable As New ADOX.Table
Dim ADOXCatalog As New ADOX.Catalog
Dim ADOConnection As New ADODB.Connectio n

Try

ADOConnection.O pen("Provider=M icrosoft.Jet.OL EDB.4.0;" & _
"Data Source=e:\My Documents\db1.m db;" & _
"Jet OLEDB:Engine Type=4;")

ADOXCatalog.Act iveConnection = ADOConnection

ADOXTable.Name = "Table11Lin ked"
ADOXTable.Paren tCatalog = ADOXCatalog
ADOXTable.Prope rties("Jet OLEDB:Link Provider String").Value = "MS Access;DATABASE =E:\My
Documents\Acces sDB.mdb"
ADOXTable.Prope rties("Jet OLEDB:Remote Table Name").Value = "Table11"
ADOXTable.Prope rties("Jet OLEDB:Create Link").Value = True
ADOXCatalog.Tab les.Append(ADOX Table)
Catch ex As Exception
MessageBox.Show (ex.Message)
Finally
ADOConnection.C lose()
End Try

End Sub
Paul ~~~ pc******@amerit ech.net
Microsoft MVP (Visual Basic)

Jul 21 '05 #5

Job Lot

Thanks Paul that worked.

"Paul Clement" wrote:

On Thu, 6 Jan 2005 16:19:01 -0800, "Job Lot" <Jo****@discuss ions.microsoft. com> wrote:

Â¤ Is there any way to programmaticall y link access tables using vb.net

Yes, you can use ADOX (Microsoft ADO Ext 2.x for DDL and Security) via interop. The below example
links to a table in an Access database:

Sub CreateAttachedA ccessTableWithA DOX()

Dim ADOXTable As New ADOX.Table
Dim ADOXCatalog As New ADOX.Catalog
Dim ADOConnection As New ADODB.Connectio n

Try

ADOConnection.O pen("Provider=M icrosoft.Jet.OL EDB.4.0;" & _
"Data Source=e:\My Documents\db1.m db;" & _
"Jet OLEDB:Engine Type=4;")

ADOXCatalog.Act iveConnection = ADOConnection

ADOXTable.Name = "Table11Lin ked"
ADOXTable.Paren tCatalog = ADOXCatalog
ADOXTable.Prope rties("Jet OLEDB:Link Provider String").Value = "MS Access;DATABASE =E:\My
Documents\Acces sDB.mdb"
ADOXTable.Prope rties("Jet OLEDB:Remote Table Name").Value = "Table11"
ADOXTable.Prope rties("Jet OLEDB:Create Link").Value = True
ADOXCatalog.Tab les.Append(ADOX Table)
Catch ex As Exception
MessageBox.Show (ex.Message)
Finally
ADOConnection.C lose()
End Try

End Sub
Paul ~~~ pc******@amerit ech.net
Microsoft MVP (Visual Basic)

Jul 21 '05 #6

Job Lot

One more question

Before creating link, how can I check to see whether or not link already
exists? In my application I get an error if link is already there in the
database.

Thanks

"Paul Clement" wrote:

On Thu, 6 Jan 2005 16:19:01 -0800, "Job Lot" <Jo****@discuss ions.microsoft. com> wrote:

Â¤ Is there any way to programmaticall y link access tables using vb.net

Yes, you can use ADOX (Microsoft ADO Ext 2.x for DDL and Security) via interop. The below example
links to a table in an Access database:

Sub CreateAttachedA ccessTableWithA DOX()

Dim ADOXTable As New ADOX.Table
Dim ADOXCatalog As New ADOX.Catalog
Dim ADOConnection As New ADODB.Connectio n

Try

ADOConnection.O pen("Provider=M icrosoft.Jet.OL EDB.4.0;" & _
"Data Source=e:\My Documents\db1.m db;" & _
"Jet OLEDB:Engine Type=4;")

ADOXCatalog.Act iveConnection = ADOConnection

ADOXTable.Name = "Table11Lin ked"
ADOXTable.Paren tCatalog = ADOXCatalog
ADOXTable.Prope rties("Jet OLEDB:Link Provider String").Value = "MS Access;DATABASE =E:\My
Documents\Acces sDB.mdb"
ADOXTable.Prope rties("Jet OLEDB:Remote Table Name").Value = "Table11"
ADOXTable.Prope rties("Jet OLEDB:Create Link").Value = True
ADOXCatalog.Tab les.Append(ADOX Table)
Catch ex As Exception
MessageBox.Show (ex.Message)
Finally
ADOConnection.C lose()
End Try

End Sub
Paul ~~~ pc******@amerit ech.net
Microsoft MVP (Visual Basic)

Jul 21 '05 #7

Job Lot

I got it working as

For Each table As ADOX.Table In ADOXCatalog.Tab les
If table.Name = tableName Then
Exit Sub
End If
Next

While I was iterating through tables collection of ADOX.Catalog, I noticed
there were actually more tables in the collection than displayed in tables
windows of access db. Most of these tables started with TMP. Where did these
tables come from?

"Job Lot" wrote:

One more question

Before creating link, how can I check to see whether or not link already
exists? In my application I get an error if link is already there in the
database.

Thanks

"Paul Clement" wrote:
On Thu, 6 Jan 2005 16:19:01 -0800, "Job Lot" <Jo****@discuss ions.microsoft. com> wrote:

Â¤ Is there any way to programmaticall y link access tables using vb.net

Yes, you can use ADOX (Microsoft ADO Ext 2.x for DDL and Security) via interop. The below example
links to a table in an Access database:

Sub CreateAttachedA ccessTableWithA DOX()

Dim ADOXTable As New ADOX.Table
Dim ADOXCatalog As New ADOX.Catalog
Dim ADOConnection As New ADODB.Connectio n

Try

ADOConnection.O pen("Provider=M icrosoft.Jet.OL EDB.4.0;" & _
"Data Source=e:\My Documents\db1.m db;" & _
"Jet OLEDB:Engine Type=4;")

ADOXCatalog.Act iveConnection = ADOConnection

ADOXTable.Name = "Table11Lin ked"
ADOXTable.Paren tCatalog = ADOXCatalog
ADOXTable.Prope rties("Jet OLEDB:Link Provider String").Value = "MS Access;DATABASE =E:\My
Documents\Acces sDB.mdb"
ADOXTable.Prope rties("Jet OLEDB:Remote Table Name").Value = "Table11"
ADOXTable.Prope rties("Jet OLEDB:Create Link").Value = True
ADOXCatalog.Tab les.Append(ADOX Table)
Catch ex As Exception
MessageBox.Show (ex.Message)
Finally
ADOConnection.C lose()
End Try

End Sub
Paul ~~~ pc******@amerit ech.net
Microsoft MVP (Visual Basic)

Jul 21 '05 #8

Paul Clement

On Sun, 9 Jan 2005 18:33:02 -0800, "Job Lot" <Jo****@discuss ions.microsoft. com> wrote:

¤ I got it working as
¤
¤ For Each table As ADOX.Table In ADOXCatalog.Tab les
¤ If table.Name = tableName Then
¤ Exit Sub
¤ End If
¤ Next
¤
¤ While I was iterating through tables collection of ADOX.Catalog, I noticed
¤ there were actually more tables in the collection than displayed in tables
¤ windows of access db. Most of these tables started with TMP. Where did these
¤ tables come from?
¤

Don't think I've seen those before but it sounds like they're internal temporary tables. You can
probably identify them by checking the Type property of the ADOX Table object.
Paul ~~~ pc******@amerit ech.net
Microsoft MVP (Visual Basic)

Jul 21 '05 #9

Job Lot

thanks paul. another question though :-)

I have a friend who is trying to create access db in asp.net, he do asp.net
in a text editor as he doesnâ€™t have vs. How can he add references to
Microsoft ADO Ext 2.7 for DDL and Security? Is there an â€œImport Namespace=â€
equivalent?
"Paul Clement" wrote:

On Sun, 9 Jan 2005 18:33:02 -0800, "Job Lot" <Jo****@discuss ions.microsoft. com> wrote:

Â¤ I got it working as
Â¤
Â¤ For Each table As ADOX.Table In ADOXCatalog.Tab les
Â¤ If table.Name = tableName Then
Â¤ Exit Sub
Â¤ End If
Â¤ Next
Â¤
Â¤ While I was iterating through tables collection of ADOX.Catalog, I noticed
Â¤ there were actually more tables in the collection than displayed in tables
Â¤ windows of access db. Most of these tables started with TMP. Where did these
Â¤ tables come from?
Â¤

Don't think I've seen those before but it sounds like they're internal temporary tables. You can
probably identify them by checking the Type property of the ADOX Table object.
Paul ~~~ pc******@amerit ech.net
Microsoft MVP (Visual Basic)

Jul 21 '05 #10

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