合并数据

假定有一个下图所示的Excel格式的订单表：

需要将其数据合并到Foxtable的订单表中，可以参考以下代码：

Dim Book As New XLS.Book("c:\test\订单.xls")
Dim Sheet As XLS.Sheet = Book.Sheets(0)
Tables("订单").StopRedraw()
'注意以下数组中列名称的顺序,必须和Excel表中的列顺序一致
Dim nms() As String = {"编号","产品","客户","雇员","单价","折扣","数量","日期"}
'注意下面的循环变量从1开始，而不是从0开始，因为Excel表的第一行是标题
For n As Integer = 1 To Sheet.Rows.Count -1
    Dim r As Row = Tables("订单").AddNew()
    For m As Integer = 0 To nms.Length - 1
         r(nms(m)) = Sheet(n,m).Value
    Next
Next
Tables("订单").ResumeRedraw()

如果订单表中已经存在相同编号的订单，那么就跳过此订单，可以将代码改为：

Dim Book As New XLS.Book("c:\test\订单.xls")
Dim Sheet As XLS.Sheet = Book.Sheets(0)
Tables("订单").StopRedraw()
'注意以下数组中列名称的顺序,必须和Excel表中的列顺序一致
Dim nms() As String = {"编号","产品","客户","雇员","单价","折扣","数量","日期"}
'注意下面的循环变量从1开始,而不是从0开始,因为Excel表的第一行是标题
For n As Integer = 1 To Sheet.Rows.Count -1
    Dim bh As String = sheet(n,0).Text
    If DataTables("订单").Find("编号 = '" & bh & "'") Is Nothing Then '如果不存在同编号的订单
        Dim r As Row = Tables("订单").AddNew()
        For m As Integer = 0 To nms.Length - 1
            r(nms(m)) = Sheet(n,m).Value
        Next
    End If
Next
Tables("订单").ResumeRedraw()

再进一步，如果存在相同编号的订单，则覆盖原来的订单，否则新增一个订单，代码为：

Dim Book As New XLS.Book("c:\test\订单.xls")
Dim Sheet As XLS.Sheet = Book.Sheets(0)
Tables("订单").StopRedraw()
Dim nms() As String = {"编号","产品","客户","雇员","单价","折扣","数量","日期"}
For n As Integer = 1 To Sheet.Rows.Count -1
    Dim bh As String = sheet(n,0).Text
    Dim dr As DataRow = DataTables("订单").Find("编号 = '" & bh & "'")
    If dr Is Nothing Then '如果不存在同编号的订单
        dr =  DataTables("订单").AddNew()
    End If
    For m As Integer = 0 To nms.Length - 1
        dr(nms(m)) = Sheet(n,m).Value
    Next
Next
Tables("订单").ResumeRedraw()

提示：其实我们用Merger合并数据会更加简单，上述代码的目的是给大家提供另一种思路，因为在一些特殊情况下，Merger可能无法正常合并数据。