ForeignKeyConstraint.UpdateRule Özellik

Tanım

Ad Alanı:

System.Data

Bütünleştirilmiş Kod:

System.Data.Common.dll

Kaynak:

ForeignKeyConstraint.cs

Bir satır güncelleştirildiğinde bu kısıtlamada gerçekleşen eylemi alır veya ayarlar.

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; }

member this.UpdateRule : System.Data.Rule with get, set

Public Overridable Property UpdateRule As Rule

Özellik Değeri

Rule

Değerlerden Rule biri. Varsayılan değer: Cascade.

Örnekler

Aşağıdaki örnek bir ForeignKeyConstraintoluşturur, çeşitli özelliklerini ayarlar ve bir DataTable nesnenin ConstraintCollectionöğesine ekler.

' 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

Ayrıca bkz.

• AcceptRejectRule
• Rule