本文整理汇总了VB.NET中System.Data.ConstraintCollection.Add方法的典型用法代码示例。如果您正苦于以下问题：VB.NET ConstraintCollection.Add方法的具体用法？VB.NET ConstraintCollection.Add怎么用？VB.NET ConstraintCollection.Add使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类System.Data.ConstraintCollection的用法示例。
在下文中一共展示了ConstraintCollection.Add方法的5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: AddConstraint
Private Sub AddConstraint(table As DataTable)
Dim uniqueConstraint As UniqueConstraint
' Assuming a column named "UniqueColumn" exists, and
' its Unique property is true.
uniqueConstraint = _
New UniqueConstraint(table.Columns("UniqueColumn"))
table.Constraints.Add(uniqueConstraint)
End Sub示例2: AddUniqueConstraint
Private Sub AddUniqueConstraint(table As DataTable)
table.Constraints.Add("idConstraint", table.Columns("id"), True)
End Sub示例3: AddForeignConstraint
Private Sub AddForeignConstraint(dataSet As DataSet)
Try
Dim parentColumn As DataColumn = _
dataSet.Tables("Suppliers").Columns("SupplierID")
Dim childColumn As DataColumn = _
dataSet.Tables("Products").Columns("SupplierID")
dataSet.Tables("Products").Constraints.Add _
("ProductsSuppliers", parentColumn, childColumn)
Catch ex As Exception
' In case the constraint already exists,
' catch the collision here and respond.
Console.WriteLine("Exception of type {0} occurred.", _
ex.GetType().ToString())
End Try
End Sub示例4: AddUniqueConstraint
Private Sub AddUniqueConstraint(table As DataTable)
Dim columns(1) As DataColumn
columns(0) = table.Columns("ID")
columns(1) = table.Columns("Name")
table.Constraints.Add("idNameConstraint", columns, True)
End Sub示例5: AddForeignConstraint
Private Sub AddForeignConstraint( _
ByVal dataSet As DataSet, ByVal table As DataTable)
Try
Dim parentColumns(1) As DataColumn
Dim childColumns(1) As DataColumn
' Get the tables from the DataSet.
Dim customersTable As DataTable = _
dataSet.Tables("Customers")
Dim ordersTable As DataTable = _
dataSet.Tables("Orders")
' Set Columns.
parentColumns(0) = customersTable.Columns("id")
parentColumns(1) = customersTable.Columns("Name")
childColumns(0) = ordersTable.Columns("CustomerID")
childColumns(1) = ordersTable.Columns("CustomerName")
' Create ForeignKeyConstraint
table.Constraints.Add("CustOrdersConstraint", _
parentColumns, childColumns)
Catch ex As Exception
' In case the constraint already exists,
' catch the collision here and respond.
Console.WriteLine("Exception of type {0} occurred.", _
ex.GetType().ToString())
End Try
End Sub