VB.NET ForeignKeyConstraint構造函數代碼示例

本文整理匯總了VB.NET中System.Data.ForeignKeyConstraint.ForeignKeyConstraint構造函數的典型用法代碼示例。如果您正苦於以下問題：VB.NET ForeignKeyConstraint構造函數的具體用法？VB.NET ForeignKeyConstraint怎麽用？VB.NET ForeignKeyConstraint使用的例子？那麽, 這裏精選的構造函數代碼示例或許可以為您提供幫助。您也可以進一步了解該構造函數所在類System.Data.ForeignKeyConstraint的用法示例。

在下文中一共展示了ForeignKeyConstraint構造函數的4個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的VB.NET代碼示例。

示例1: CreateConstraint

' The next line goes into the Declarations section.
' 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(parentColumn, childColumn)

   ' Set various properties of the constraint.
   With fkConstraint
      .ConstraintName = "suppierFKConstraint"
      .DeleteRule = Rule.SetNull
      .UpdateRule = Rule.Cascade
      .AcceptRejectRule = AcceptRejectRule.Cascade
   End With

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

開發者ID:VB.NET開發者，項目名稱:System.Data，代碼行數:29，代碼來源:ForeignKeyConstraint

示例2: CreateConstraint

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

Private Sub CreateConstraint()
   ' Declare parent column and child column variables.
   Dim parentColumns(1) As DataColumn
   Dim childColumns(1) As DataColumn
   Dim fkConstraint As ForeignKeyConstraint

   ' Set parent and child column variables.
   parentColumns(0) = _
       suppliersProducts.Tables("OrderDetails").Columns("OrderID")
   parentColumns(1) = _
       suppliersProducts.Tables("OrderDetails").Columns("ProductID")
   childColumns(0) = _
       suppliersProducts.Tables("Sales").Columns("OrderID")
   childColumns(1) = _
       suppliersProducts.Tables("Sales").Columns("ProductID")
   fkConstraint = _
       New ForeignKeyConstraint(parentColumns, childColumns)

   ' Set various properties of the constraint.
   With fkConstraint
      .ConstraintName = "ProductSalesOrders"
      .DeleteRule = Rule.SetDefault
      .UpdateRule = Rule.Cascade
      .AcceptRejectRule = AcceptRejectRule.Cascade
   End With

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

開發者ID:VB.NET開發者，項目名稱:System.Data，代碼行數:35，代碼來源:ForeignKeyConstraint

示例3: CreateConstraint

' 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 fkeyConstraint As ForeignKeyConstraint

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

   ' Set various properties of the constraint.
   With fkeyConstraint
      .DeleteRule = Rule.SetNull
      .UpdateRule = Rule.Cascade
      .AcceptRejectRule = AcceptRejectRule.Cascade
   End With

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

開發者ID:VB.NET開發者，項目名稱:System.Data，代碼行數:29，代碼來源:ForeignKeyConstraint

示例4: CreateConstraint

Private Sub CreateConstraint(ByVal suppliersProducts As DataSet)
    ' Declare parent column and child column variables.
    Dim parentColumns(1) As DataColumn
    Dim childColumns(1) As DataColumn
    Dim fkConstraint As ForeignKeyConstraint

    ' Set parent and child column variables.
    parentColumns(0) = _
        suppliersProducts.Tables("OrderDetails").Columns("OrderID")
    parentColumns(1) = _
        suppliersProducts.Tables("OrderDetails").Columns("ProductID")
    childColumns(0) = _
        suppliersProducts.Tables("Sales").Columns("OrderID")
    childColumns(1) = _
        suppliersProducts.Tables("Sales").Columns("ProductID")
    fkConstraint = New ForeignKeyConstraint( _
        "ProductSalesOrders", parentColumns, childColumns)

    ' Set various properties of the constraint.
    With fkConstraint
        .DeleteRule = Rule.SetDefault
        .UpdateRule = Rule.Cascade
        .AcceptRejectRule = AcceptRejectRule.Cascade
    End With

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

開發者ID:VB.NET開發者，項目名稱:System.Data，代碼行數:30，代碼來源:ForeignKeyConstraint

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