Value 属性示例 (VB)

此示例通过显示 Employees 表的字段和属性值来演示具有 FieldProperty 对象的 Value 属性。

Public Sub Main()  
    On Error GoTo ErrorHandler  
    'To integrate this code  
    'replace the data source and initial catalog values  
    'in the connection string  
    ' connection and recordset variables  
    Dim rstEmployees As ADODB.Recordset  
    Dim Cnxn As ADODB.Connection  
    Dim strCnxn As String  
    Dim strSQLEmployees As String  
     ' field property variables  
    Dim fld As ADODB.Field  
    Dim prp As ADODB.Property  
     ' Open connection  
    Set Cnxn = New ADODB.Connection  
    strCnxn = "Provider='sqloledb';Data Source='MySqlServer';" & _  
        "Initial Catalog='Pubs';Integrated Security='SSPI';"  
    Cnxn.Open strCnxn  
    ' Open recordset with data from Employees table  
    Set rstEmployees = New ADODB.Recordset  
    strSQLEmployees = "employee"  
    rstEmployees.Open strSQLEmployees, Cnxn, , , adCmdTable  
    'rstEmployees.Open strSQLEmployees, Cnxn, adOpenStatic, adLockReadOnly, adCmdTable  
    ' the above two lines of code are identical  
    Debug.Print "Field values in rstEmployees"  
    ' Enumerate the Fields collection of the Employees table  
    For Each fld In rstEmployees.Fields  
        ' Because Value is the default property of a  
        ' Field object, the use of the actual keyword  
        ' here is optional.  
        Debug.Print "   " & fld.Name & " = " & fld.Value  
    Next fld  
    Debug.Print "Property values in rstEmployees"  
    ' Enumerate the Properties collection of the Recordset object  
    For Each prp In rstEmployees.Properties  
        Debug.Print "   " & prp.Name & " = " & prp.Value  
        ' because Value is the default property of a Property object  
        ' use of the actual Value keyword is optional  
    Next prp  
    ' clean up  
    Set rstEmployees = Nothing  
    Set Cnxn = Nothing  
    Exit Sub  
    ' clean up  
    If Not rstEmployees Is Nothing Then  
        If rstEmployees.State = adStateOpen Then rstEmployees.Close  
    End If  
    Set rstEmployees = Nothing  
    If Not Cnxn Is Nothing Then  
        If Cnxn.State = adStateOpen Then Cnxn.Close  
    End If  
    Set Cnxn = Nothing  
    If Err <> 0 Then  
        MsgBox Err.Source & "-->" & Err.Description, , "Error"  
    End If  
End Sub  


属性对象 (ADO)
Value 属性 (ADO)