ForeignKeyConstraint.UpdateRule プロパティ

定義

名前空間:

System.Data

アセンブリ:

System.Data.Common.dll

ソース:

ForeignKeyConstraint.cs

行を更新したときにこの制約全体で発生するアクションを取得または設定します。

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

プロパティ値

Rule

Rule 値のいずれか 1 つ。 既定値は、Cascade です。

例

次の例では、 をForeignKeyConstraint作成し、さまざまなプロパティを設定し、オブジェクトの ConstraintCollectionにDataTable追加します。

' 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

こちらもご覧ください

• AcceptRejectRule
• Rule