ForeignKeyConstraint.UpdateRule ForeignKeyConstraint.UpdateRule ForeignKeyConstraint.UpdateRule ForeignKeyConstraint.UpdateRule Property

Definición

Obtiene o establece la acción que se produce en esta restricción cuando se actualiza una fila.Gets or sets the action that occurs across this constraint on when a row is updated.

public:
 virtual property System::Data::Rule UpdateRule { System::Data::Rule get(); void set(System::Data::Rule value); };
[System.Data.DataSysDescription("ForeignKeyConstraintUpdateRuleDescr")]
public virtual System.Data.Rule UpdateRule { get; set; }
member this.UpdateRule : System.Data.Rule with get, set
Public Overridable Property UpdateRule As Rule

Valor de propiedad

Uno de los valores de Rule.One of the Rule values. De manera predeterminada, es Cascade.The default is Cascade.

Ejemplos

En el ejemplo siguiente se ForeignKeyConstraintcrea un, se establecen varias de sus propiedades y se agrega DataTable a un ConstraintCollectionobjeto.The following example creates a ForeignKeyConstraint, sets various of its properties, and adds it to a DataTable object's ConstraintCollection.

' The next line goes into the Declarations section of the module:
' SuppliersProducts is a class derived from DataSet.
Private suppliersProducts As SuppliersProducts 

Private Sub CreateConstraint()
   ' Declare parent column and child column variables.
   Dim parentColumn As DataColumn
   Dim childColumn As DataColumn
   Dim fkConstraint As ForeignKeyConstraint

   ' Set parent and child column variables.
   parentColumn = suppliersProducts.Tables("Suppliers").Columns("SupplierID")
   childColumn = suppliersProducts.Tables("Products").Columns("SupplieriD")
   fkConstraint = New ForeignKeyConstraint( _
       "SuppierFKConstraint", parentColumn, childColumn)

   ' Set null values when a value is deleted.
   fkConstraint.DeleteRule = Rule.SetNull
   fkConstraint.UpdateRule = Rule.Cascade
   fkConstraint.AcceptRejectRule = AcceptRejectRule.Cascade

   ' Add the constraint, and set EnforceConstraints to true.
   suppliersProducts.Tables("Suppliers").Constraints.Add(fkConstraint)
   suppliersProducts.EnforceConstraints = True
End Sub

Se aplica a

Consulte también: