主题：用目录树获取外部数据表名称及列名称

获得外部表的名称，这里有：
http://www.foxtable.com/help/topics/1943.htm
 
既然能获得外部表的名称，就：
 
 Dim cmd As New SQLCommand
Dim dt As DataTable
Dim cmb As WinForm.ComboBox
cmd.CommandText = "SELECT * From {表名} Where [_Identify] Is Null"
Cmd.Connection Name = "数据源名称"
dt = cmd.ExecuteReader()

for each dc in dt.DataCols

    output.show(dc.name)

next