Question

请你帮我按第二栏降序排序吗？

Dim ds As New DataSet()
conn.Open()

techSpeciality = LB_techFaultType.Text
techZone = LB_TechZone.Text

Dim strSQL As String = "SELECT Tech_ID, Last_Zone FROM Technician_List WHERE Availability=TRUE AND Speciality='" & techSpeciality & "' AND Last_Zone='" & techZone & "'"
Dim da As New OleDbDataAdapter(strSQL, conn)

da.Fill(ds)
'2D array
Dim values(ds.Tables(0).Rows.Count - 1, 2) As Integer

'for loop between 0 and all available technicians
For value As Integer = 0 To ds.Tables(0).Rows.Count - 1
'Tech_ID column
  values(value, 0) = ds.Tables(0).Rows(value).Item(0).value()
  'Zone column, converts negative value to a positive and minus' the selected techZone
  Math.Abs(values(value, 1) = techZone - ds.Tables(0).Rows(value).Item(1).value())
Next

Answer 1

修改此行：

Dim strSQL As String = "SELECT Tech_ID, Last_Zone" & _
                      " FROM Technician_List WHERE" & _
                      " Availability=TRUE AND Speciality='" & techSpeciality & _
                      "' AND Last_Zone='" & techZone & _
                      "' ORDER BY Last_Zone DESC"

有关ORDER BY关键字的更多信息： http://www.w3schools.com/sql/sql_orderby.asp

Answer 2

另一种选择是ORDER BY 2 DESC，而不是直接指定列名。

通过降序vb.net对二维数组进行排序

2 个答案: