Item Property Example (VB)

This example demonstrates how the Item property accesses members of a collection. The example opens the Authors table of the Pubs database with a parameterized command.

The parameter in the command issued against the database is accessed from the Command object's Parameters collection by index and name. The fields of the returned Recordset are then accessed from that object's Fields collection by index and name.

'BeginItemVB  

    'To integrate this code  
    'replace the data source and initial catalog values  
    'in the connection string  

Public Sub Main()  
    On Error GoTo ErrorHandler  

    Dim Cnxn As ADODB.Connection  
    Dim rstAuthors As ADODB.Recordset  
    Dim cmd As ADODB.Command  
    Dim prm As ADODB.Parameter  
    Dim fld As ADODB.Field  
    Dim strCnxn As String  

    Dim ix As Integer  
    Dim limit As Long  
    Dim Column(0 To 8) As Variant  

    Set Cnxn = New ADODB.Connection  
    Set rstAuthors = New ADODB.Recordset  
    Set cmd = New ADODB.Command  

    'Set the array with the Authors table field (column) names  
    Column(0) = "au_id"  
    Column(1) = "au_lname"  
    Column(2) = "au_fname"  
    Column(3) = "phone"  
    Column(4) = "address"  
    Column(5) = "city"  
    Column(6) = "state"  
    Column(7) = "zip"  
    Column(8) = "contract"  

    cmd.CommandText = "SELECT * FROM Authors WHERE state = ?"  
    Set prm = cmd.CreateParameter("ItemXparm", adChar, adParamInput, 2, "CA")  
    cmd.Parameters.Append prm  
     ' set connection  
    strCnxn = "Provider='sqloledb';Data Source='MySqlServer';" & _  
        "Initial Catalog='Pubs';Integrated Security='SSPI';"  
    Cnxn.Open strCnxn  
    cmd.ActiveConnection = Cnxn  
     ' open recordset  
    rstAuthors.Open cmd, , adOpenStatic, adLockReadOnly  
    'Connection and CommandType are omitted because  
    'a Command object is provided  

    Debug.Print "The Parameters collection accessed by index..."  
    Set prm = cmd.Parameters.Item(0)  
    Debug.Print "Parameter name = '"; prm.Name; "', value = '"; prm.Value; "'"  
    Debug.Print  

    Debug.Print "The Parameters collection accessed by name..."  
    Set prm = cmd.Parameters.Item("ItemXparm")  
    Debug.Print "Parameter name = '"; prm.Name; "', value = '"; prm.Value; "'"  
    Debug.Print  

    Debug.Print "The Fields collection accessed by index..."  

    rstAuthors.MoveFirst  
    limit = rstAuthors.Fields.Count - 1  
    For ix = 0 To limit  
       Set fld = rstAuthors.Fields.Item(ix)  
       Debug.Print "Field "; ix; ": Name = '"; fld.Name; _  
                   "', Value = '"; fld.Value; "'"  
    Next ix  

    Debug.Print  

    Debug.Print "The Fields collection accessed by name..."  

    rstAuthors.MoveFirst  
    For ix = 0 To 8  
       Set fld = rstAuthors.Fields.Item(Column(ix))  
       Debug.Print "Field name = '"; fld.Name; "', Value = '"; fld.Value; "'"  
    Next ix  

    ' clean up  
    rstAuthors.Close  
    Cnxn.Close  
    Set rstAuthors = Nothing  
    Set Cnxn = Nothing  
    Exit Sub  

ErrorHandler:  
    ' clean up  
    If Not rstAuthors Is Nothing Then  
        If rstAuthors.State = adStateOpen Then rstAuthors.Close  
    End If  
    Set rstAuthors = Nothing  

    If Not Cnxn Is Nothing Then  
        If Cnxn.State = adStateOpen Then Cnxn.Close  
    End If  
    Set Cnxn = Nothing  

    Set cmd = Nothing  

    If Err <> 0 Then  
        MsgBox Err.Source & "-->" & Err.Description, , "Error"  
    End If  

End Sub  
'EndItemVB  

See Also

Command Object (ADO)
Fields Collection (ADO)
Item Property (ADO)
Parameters Collection (ADO)
Recordset Object (ADO)