Fields.Delete, méthode (DAO)

S’applique à : Access 2013, Office 2013

Supprime un objet Field de la collection Fields.

Syntaxe

expression . Delete(Name)

expression Variable qui représente un objet Fields.

Paramètres

Nom	Obligatoire/facultatif	Type de données	Description
Name	Obligatoire	String	Champ à supprimer.

Remarques

La suppression d'un objet stocké a lieu immédiatement, mais vous devez utiliser la méthode Refresh dans toutes les autres collections qui peuvent être affectées par les modifications apportées à la structure de la base de données.

Exemple

Cet exemple utilise la méthode Append ou la méthode Delete pour modifier la collection Fields d'une TableDef. La procédure AppendDeleteField est nécessaire à l'exécution de cette procédure.

    Sub AppendX() 
     
     Dim dbsNorthwind As Database 
     Dim tdfEmployees As TableDef 
     Dim fldLoop As Field 
     
     Set dbsNorthwind = OpenDatabase("Northwind.mdb") 
     Set tdfEmployees = dbsNorthwind.TableDefs!Employees 
     
     ' Add three new fields. 
     AppendDeleteField tdfEmployees, "APPEND", _ 
     "E-mail", dbText, 50 
     AppendDeleteField tdfEmployees, "APPEND", _ 
     "Http", dbText, 80 
     AppendDeleteField tdfEmployees, "APPEND", _ 
     "Quota", dbInteger, 5 
     
     Debug.Print "Fields after Append" 
     Debug.Print , "Type", "Size", "Name" 
     
     ' Enumerate the Fields collection to show the new fields. 
     For Each fldLoop In tdfEmployees.Fields 
     Debug.Print , fldLoop.Type, fldLoop.Size, fldLoop.Name 
     Next fldLoop 
     
     ' Delete the newly added fields. 
     AppendDeleteField tdfEmployees, "DELETE", "E-mail" 
     AppendDeleteField tdfEmployees, "DELETE", "Http" 
     AppendDeleteField tdfEmployees, "DELETE", "Quota" 
     
     Debug.Print "Fields after Delete" 
     Debug.Print , "Type", "Size", "Name" 
     
     ' Enumerate the Fields collection to show that the new 
     ' fields have been deleted. 
     For Each fldLoop In tdfEmployees.Fields 
     Debug.Print , fldLoop.Type, fldLoop.Size, fldLoop.Name 
     Next fldLoop 
     
     dbsNorthwind.Close 
     
    End Sub 
     
    Sub AppendDeleteField(tdfTemp As TableDef, _ 
     strCommand As String, strName As String, _ 
     Optional varType, Optional varSize) 
     
     With tdfTemp 
     
     ' Check first to see if the TableDef object is 
     ' updatable. If it isn't, control is passed back to 
     ' the calling procedure. 
     If .Updatable = False Then 
     MsgBox "TableDef not Updatable! " & _ 
     "Unable to complete task." 
     Exit Sub 
     End If 
     
     ' Depending on the passed data, append or delete a 
     ' field to the Fields collection of the specified 
     ' TableDef object. 
     If strCommand = "APPEND" Then 
     .Fields.Append .CreateField(strName, _ 
     varType, varSize) 
     Else 
     If strCommand = "DELETE" Then .Fields.Delete _ 
     strName 
     End If 
     
     End With 
     
    End Sub