.net – 以编程方式获取表的外键约束

我正在尝试使用DataTable来获取SQL Server数据库的模式.
但是,当尝试检测ForeignKeys时,约束集合仅带来UNIQUE约束.

Private Sub ShowConstraints(ByVal tableName As String)

    Dim table As DataTable = New DataTable(tableName)
    Using connection As SqlConnection = New SqlConnection(GetConnectionString)

        Dim adapter As SqlDataAdapter = New SqlDataAdapter("Select top 1 * from " + _                  
                                                  tableName, connection)
        connection.Open()
        adapter.FillSchema(table, SchemaType.Mapped)

        For Each c As Constraint In table.Constraints
            If TypeOf c Is ForeignKeyConstraint Then
                Dim fk As ForeignKeyConstraint = CType(c, ForeignKeyConstraint)
                Console.WriteLine("** FK ** relatedTable: {0}; RelatedColumns: {1}", _
                    fk.RelatedTable, fk.RelatedColumns)
            Else
                Console.WriteLine("** Whatever ** Name: {0}; Type: {1}", _
                                           c.ConstraintName, c.GetType.ToString)
            End If
        Next

    End Using


End Sub

我怎样才能获得ForeignKey约束？

那是出乎意料的.事实证明,毕竟FillSchema方法不会返回外键信息.
我有一些看起来应该这样做的示例代码,但事实并非如此.

如果您真正想要的是以编程方式查询数据库中的所有FK,那么请从您的代码中尝试此系统存储过程.

msdb.dbo.sp_Help’tableName’

它返回一个数据集.第7个表具有表的所有约束,包括FK.