参考:
http://www.foxtable.com/help/topics/0400.htm
http://www.foxtable.com/help/topics/0396.htm
查找发生日期为空并且商品名称不为空:
If DataTables("存货账").Find("[业务发生日期] Is Null And [商品名称] Is Not Null") Is Nothing Then
End If