Bagikan melalui


ForeignKeyConstraint.UpdateRule Properti

Definisi

Mendapatkan atau mengatur tindakan yang terjadi di seluruh batasan ini saat baris diperbarui.

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

Nilai Properti

Salah Rule satu nilai. Default adalah Cascade.

Atribut

Contoh

Contoh berikut membuat ForeignKeyConstraint, mengatur berbagai propertinya, dan menambahkannya ke DataTable objek 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

Berlaku untuk

Lihat juga