Item 属性示例 (VB)

此示例演示 Item 属性如何访问集合的成员。 该示例使用参数化命令打开 Pubs 数据库的 Authors 表。

针对数据库发出的命令中的参数按索引和名称从 Command 对象的 Parameters 集合进行访问。 然后按索引和名称从该对象的 Fields 集合访问返回的 Recordset 的字段。

'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  

另请参阅

命令对象 (ADO)
字段集合 (ADO)
Item 属性 (ADO)
参数集合 (ADO)
记录集对象 (ADO)