Microsoft KB Archive/230588

= How To Link and Refresh Linked Jet Tables Using ADOX =

Article ID: 230588

Article Last Modified on 7/1/2004

-

APPLIES TO


 * Microsoft ActiveX Data Objects 2.1
 * Microsoft ActiveX Data Objects 2.1 Service Pack 1
 * Microsoft ActiveX Data Objects 2.1 Service Pack 2
 * Microsoft ActiveX Data Objects 2.5
 * Microsoft ActiveX Data Objects 2.6
 * Microsoft ActiveX Data Objects 2.7

-



This article was previously published under Q230588



SUMMARY
You can update the connection information for a linked table by using the Data Access Objects (DAO) RefreshLink method. This article describes another way to do this with ActiveX Data Objects (ADO) version 2.1 and later by using the Tables collection exposed by the ADO Extensibility model (ADOX).



MORE INFORMATION
 In Microsoft Visual Basic, create a new Standard EXE project. Form1 is added to the project by default. On the Project menu, click References. From the list of available components, select Microsoft ActiveX Data Objects 2.1 Library and Microsoft ADO Ext. 2.1 for DDL and Security. Place two CommandButton controls on Form1: cmdRefreshLink and cmdCreateLinkedTable.  Paste the following code in the Declarations section of Form1: Option Explicit

Dim cn As ADODB.Connection

Private Sub Form_Load Set cn = New ADODB.Connection cn.Open "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=D:\Db1.mdb" End Sub

Private Sub cmdCreateLinkedTable_Click Dim cat As ADOX.Catalog Dim tbl As ADOX.Table Set cat = New ADOX.Catalog Set tbl = New ADOX.Table

' Open the catalog. cat.ActiveConnection = cn  ' Create the new Table. tbl.Name = "Linked_Employees" Set tbl.ParentCatalog = cat

' Set the properties to create the link. tbl.Properties("Jet OLEDB:Link Datasource") = "D:\nwind.mdb" tbl.Properties("Jet OLEDB:Remote Table Name") = "Employees" tbl.Properties("Jet OLEDB:Create Link") = True

' Append the table to the Tables collection. cat.Tables.Append tbl Set cat = Nothing End Sub

Private Sub cmdRefreshLink_Click Dim cat As ADOX.Catalog Dim tbl As ADOX.Table Set cat = New ADOX.Catalog Set tbl = New ADOX.Table ' Open the catalog. cat.ActiveConnection = cn  For Each tbl In cat.Tables If tbl.Type = "LINK" And tbl.Name = "Linked_Employees" Then tbl.Properties("Jet OLEDB:Link Datasource") = "D:\OtherSource.mdb" End If  Next End Sub  Modify the code in the Form_Load event to point the connection string to a valid Database in the cn.Open method. Modify the code in the cmdCreateLinkedTable_Click event to point the connection string to the Northwind sample database in the tbl.Properties("Jet OLEDB:Link Datasource") assignment. Modify the code in the cmdRefreshLink_Click event to point the tbl.Properties("Jet OLEDB:Link Datasource") assignment to another valid location.</li> Run the project.</li></ol>

The cmdCreateLinkedTable procedure creates a linked table, Linked_Employees, from the Northwind sample database Employees table. The cmdRefreshLink procedure refreshes the linked tables with a new database location.

<div class="references_section">