多个联接列

组合统计结果的联接列可以有多个。
假定进货单、销售单、退货单三个表,除了型号列之外,还有一个品名列,需要根据品名和型号分组,统计进货、销售、退货、库存数据,代码为:

Dim bd1 As New GroupTableBuilder("统计表1",DataTables("进货单"))
Dim
dt1 As fxDataSource
bd1
.Groups.AddDef("品名") '根据品名分组
bd1
.Groups.AddDef("型号") '根据型号分组
bd1
.Totals.AddDef("数量","进货_数量") '对数量进行统计
bd1
.Totals.AddDef("金额","进货_金额") '对金额进行统计
dt1
= bd1.BuildDataSource() 

Dim bd2 As New GroupTableBuilder("统计表2",DataTables("销售单"))
Dim
dt2 As fxDataSource
bd2
.Groups.AddDef("品名") '根据品名分组
bd2
.Groups.AddDef("型号") '根据型号分组
bd2
.Totals.AddDef("数量","销售_数量") '对数量进行统计
bd2
.Totals.AddDef("金额","销售_金额") '对金额进行统计
dt2
= bd2.BuildDataSource()

Dim bd3 As New GroupTableBuilder("统计表3",DataTables("退货单"))
Dim
dt3 As fxDataSource
bd3
.Groups.AddDef("品名") '根据品名分组
bd3
.Groups.AddDef("型号") '根据型号分组
bd3
.Totals.AddDef("数量","退货_数量") '对数量进行统计
bd3
.Totals.AddDef("金额","退货_金额") '对金额进行统计
dt3
= bd3.BuildDataSource()

Dim nms As String() = {"品名","型号"} '指定连接列
dt1.Combine(nms,dt2,nms) '将销售统计数据组合到进货统计数据
dt1.Combine(nms,dt3,nms) '将退货统计数据组合到进货统计数据
dt1.Show("统计表1") '显示统计结果


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