ParentCatalog Property Example (VB)

מאמר
11/18/2022

The following code demonstrates how to use the ParentCatalog property to access a provider-specific property prior to appending a table to a catalog. The property is AutoIncrement, which creates an AutoIncrement field in a Microsoft Jet database.

' BeginCreateAutoIncrColumnVB  
Sub Main()  
    On Error GoTo CreateAutoIncrColumnError  
  
    Dim cnn As New ADODB.Connection  
    Dim cat As New ADOX.Catalog  
    Dim tbl As New ADOX.Table  
  
    cnn.Open "Provider='Microsoft.Jet.OLEDB.4.0';" & _  
        "Data Source='Northwind.mdb';"  
    Set cat.ActiveConnection = cnn  
  
    With tbl  
        .Name = "MyContacts"  
        Set .ParentCatalog = cat  
        ' Create fields and append them to the new Table object.  
        .Columns.Append "ContactId", adInteger  
        ' Make the ContactId column and auto incrementing column  
        .Columns("ContactId").Properties("AutoIncrement") = True  
        .Columns.Append "CustomerID", adVarWChar  
        .Columns.Append "FirstName", adVarWChar  
        .Columns.Append "LastName", adVarWChar  
        .Columns.Append "Phone", adVarWChar, 20  
        .Columns.Append "Notes", adLongVarWChar  
    End With  
  
    cat.Tables.Append tbl  
    Debug.Print "Table 'MyContacts' is added."  
  
    ' Delete the table as this is a demonstration.  
    cat.Tables.Delete tbl.Name  
    Debug.Print "Table 'MyContacts' is delete."  
  
    'Clean up  
    cnn.Close  
    Set cat = Nothing  
    Set tbl = Nothing  
    Set cnn = Nothing  
    Exit Sub  
  
CreateAutoIncrColumnError:  
  
    Set cat = Nothing  
    Set tbl = Nothing  
  
    If Not cnn Is Nothing Then  
        If cnn.State = adStateOpen Then cnn.Close  
    End If  
    Set cnn = Nothing  
  
    If Err <> 0 Then  
        MsgBox Err.Source & "-->" & Err.Description, , "Error"  
    End If  
  
End Sub  
' EndCreateAutoIncrColumnVB

שתף באמצעות

ParentCatalog Property Example (VB)

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