主题：统计立方数

Dim gb As New SQLGroupTableBuilder("A","订单明细")

gb.ConnectionName =“AA”
Dim dt1 As fxDataSource
gb.AddTable("订单明细","产品编号","产品","产品编号")

gb.Groups.AddDef("{产品}.规格") '根据规格分组
gb.Totals.AddExp("立方数","{产品}.Eval("规格")*0.001")
dt1 = gb.BuildDataSource()
dt1.Show("A") '显示统计结果

求助，谢谢！