本文整理汇总了VB.NET中System.Data.Rule枚举的典型用法代码示例。如果您正苦于以下问题：VB.NET Rule枚举的具体用法？VB.NET Rule怎么用？VB.NET Rule使用的例子？那么, 这里精选的枚举代码示例或许可以为您提供帮助。
在下文中一共展示了Rule枚举的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的VB.NET代码示例。
示例1: 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 null values when a value is deleted.
fkeyConstraint.DeleteRule = Rule.SetNull
fkeyConstraint.UpdateRule = Rule.Cascade
fkeyConstraint.AcceptRejectRule = AcceptRejectRule.Cascade
' Add the constraint, and set EnforceConstraints to true.
suppliersProducts.Tables("Products").Constraints.Add(fkeyConstraint)
suppliersProducts.EnforceConstraints = True
End Sub