- Foxtable(狐表) (http://foxtable.net/bbs/index.asp)
-- 专家坐堂 (http://foxtable.net/bbs/list.asp?boardid=2)
---- 对后台数据排序 (http://foxtable.net/bbs/dispbbs.asp?boardid=2&id=93459)
-- 发布时间：2016/11/29 14:37:00
-- 对后台数据排序
Dim dt As DataTable = DataTables("成绩")
Dim Arys As List(Of String()) = dt.GetValues("考试名称|学校代码|年级代码")
For Each Ary As String() In Arys
Dim drs As List(Of DataRow) = dt.Select("[考试名称] = \'" & ary(0) & "\'And [学校代码] = \'" & ary(1) & "\'and [年级代码] =\'" & ary(2) & "\'", "折总 DESC")
For n As Integer = 0 To drs.Count - 1 \'遍历所有行
If n > 0 AndAlso drs(n)("折总") = drs(n-1)("折总") Then \'如果总分和上一行相同
drs(n)("校序") = drs(n-1)("校序") \'则排名等于上一行
Else
drs(n)("校序") = n + 1 \'设置排名
End If
Next
Next
Dim Arys1 As List(Of String()) = dt.GetValues("考试名称|学校代码|年级代码|班级")
For Each Ary1 As String() In Arys1
Dim drs As List(Of DataRow) = dt.Select("[考试名称] = \'" & ary1(0) & "\'And [学校代码] = \'" & ary1(1) & "\'and [年级代码] =\'" & ary1(2) & "\'And [班级] = \'" & ary1(3) & "\'", "折总 DESC")
For m As Integer = 0 To drs.Count - 1 \'遍历所有行
If m > 0 AndAlso drs(m)("折总") = drs(m-1)("折总") Then \'如果总分和上一行相同
drs(m)("班序") = drs(m-1)("班序") \'则排名等于上一行
Else
drs(m)("班序") = m + 1 \'设置排名
End If
Next
Next
dt.save()
老师，我改了个代码是想对成绩进行后台排名次，因为现在这样只能对加载了的数据排序，问题就会造成每次因加载的数据不一样，排序结果就变了，请老师指导下如何能直接后台把名次排出来。请指教
-- 发布时间：2016/11/29 14:38:00
--
Dim cmd As New SQLCommand
Dim dt As DataTable = DataTables("成绩")
cmd.c
cmd.CommandText = "SEL ECT * From {成绩}"
dt = cmd.ExecuteReader()
\'\'Dim dt As DataTable = DataTables("成绩")
Dim Arys As List(Of String()) = dt.GetValues("考试名称|学校代码|年级代码")
For Each Ary As String() In Arys
Dim drs As List(Of DataRow) = dt.sqlSelect("[考试名称] = \'" & ary(0) & "\'And [学校代码] = \'" & ary(1) & "\'and [年级代码] =\'" & ary(2) & "\'", "折总 DESC")
For n As Integer = 0 To drs.Count - 1 \'遍历所有行
If n > 0 AndAlso drs(n)("折总") = drs(n-1)("折总") Then \'如果总分和上一行相同
drs(n)("校序") = drs(n-1)("校序") \'则排名等于上一行
Else
drs(n)("校序") = n + 1 \'设置排名
End If
Next
Next
Dim Arys1 As List(Of String()) = dt.GetValues("考试名称|学校代码|年级代码|班级")
For Each Ary1 As String() In Arys1
Dim drs As List(Of DataRow) = dt.sqlSelect("[考试名称] = \'" & ary1(0) & "\'And [学校代码] = \'" & ary1(1) & "\'and [年级代码] =\'" & ary1(2) & "\'And [班级] = \'" & ary1(3) & "\'", "折总 DESC")
For m As Integer = 0 To drs.Count - 1 \'遍历所有行
If m > 0 AndAlso drs(m)("折总") = drs(m-1)("折总") Then \'如果总分和上一行相同
drs(m)("班序") = drs(m-1)("班序") \'则排名等于上一行
Else
drs(m)("班序") = m + 1 \'设置排名
End If
Next
Next
dt.save()
\'\'DataTables("成绩").SQLUpdate
改成了上面的代码没反应
-- 发布时间：2016/11/29 15:03:00
--
你改过头了，用了SQLCommand就没有必要sqlSｅlect了
Dim cmd As New SQLCommand
Dim dt As DataTable = DataTables("成绩")
cmd.c
cmd.CommandText = "SELｅCT * From {成绩}"
dt = cmd.ExecuteReader()
\'\'Dim dt As DataTable = DataTables("成绩")
Dim Arys As List(Of String()) = dt.GetValues("考试名称|学校代码|年级代码")
For Each Ary As String() In Arys
Dim drs As List(Of DataRow) = dt.Sｅlect("[考试名称] = \'" & ary(0) & "\'And [学校代码] = \'" & ary(1) & "\'and [年级代码] =\'" & ary(2) & "\'", "折总 DESC")
For n As Integer = 0 To drs.Count - 1 \'遍历所有行
If n > 0 AndAlso drs(n)("折总") = drs(n-1)("折总") Then \'如果总分和上一行相同
drs(n)("校序") = drs(n-1)("校序") \'则排名等于上一行
Else
drs(n)("校序") = n + 1 \'设置排名
End If
Next
Next
Dim Arys1 As List(Of String()) = dt.GetValues("考试名称|学校代码|年级代码|班级")
For Each Ary1 As String() In Arys1
Dim drs As List(Of DataRow) = dt.Sｅlect("[考试名称] = \'" & ary1(0) & "\'And [学校代码] = \'" & ary1(1) & "\'and [年级代码] =\'" & ary1(2) & "\'And [班级] = \'" & ary1(3) & "\'", "折总 DESC")
For m As Integer = 0 To drs.Count - 1 \'遍历所有行
If m > 0 AndAlso drs(m)("折总") = drs(m-1)("折总") Then \'如果总分和上一行相同
drs(m)("班序") = drs(m-1)("班序") \'则排名等于上一行
Else
drs(m)("班序") = m + 1 \'设置排名
End If
Next
Next
dt.save()
-- 发布时间：2016/11/29 15:27:00
--
老师，还是没反应呢
-- 发布时间：2016/11/29 15:46:00
--
这是修改的后台数据。最后你需要重新加载一下数据才会刷新
-- 发布时间：2016/11/29 17:05:00
--
Dim dt As DataTable = DataTables("成绩")
Dim Arys As List(Of String()) = dt.GetValues("考试名称|学校代码|年级代码")
For Each Ary As String() In Arys
Dim drs As List(Of DataRow) = dt.sqlSelect("[考试名称] = \'" & ary(0) & "\'And [学校代码] = \'" & ary(1) & "\'and [年级代码] =\'" & ary(2) & "\'", "折总 DESC")
For n As Integer = 0 To drs.Count - 1 \'遍历所有行
If n > 0 AndAlso drs(n)("折总") = drs(n-1)("折总") Then \'如果总分和上一行相同
drs(n)("校序") = drs(n-1)("校序") \'则排名等于上一行
Else
drs(n)("校序") = n + 1 \'设置排名
End If
Next
Next
Dim Arys1 As List(Of String()) = dt.GetValues("考试名称|学校代码|年级代码|班级")
For Each Ary1 As String() In Arys1
Dim drs As List(Of DataRow) = dt.sqlSelect("[考试名称] = \'" & ary1(0) & "\'And [学校代码] = \'" & ary1(1) & "\'and [年级代码] =\'" & ary1(2) & "\'And [班级] = \'" & ary1(3) & "\'", "折总 DESC")
For m As Integer = 0 To drs.Count - 1 \'遍历所有行
If m > 0 AndAlso drs(m)("折总") = drs(m-1)("折总") Then \'如果总分和上一行相同
drs(m)("班序") = drs(m-1)("班序") \'则排名等于上一行
Else
drs(m)("班序") = m + 1 \'设置排名
End If
Next
Next
dt.save()
老师我测了，重新加载也没排起
-- 发布时间：2016/11/29 17:24:00
--
唉，都说了用了SQLCommand就没有必要用sqlSｅlect了
Dim cmd As New SQLCommand
Dim dt As DataTable
cmd.c
cmd.CommandText = "SELｅCT * From {成绩}"
dt = cmd.ExecuteReader()
\'\'Dim dt As DataTable = DataTables("成绩")
Dim Arys As List(Of String()) = dt.GetValues("考试名称|学校代码|年级代码")
For Each Ary As String() In Arys
Dim drs As List(Of DataRow) = dt.Sｅlect("[考试名称] = \'" & ary(0) & "\'And [学校代码] = \'" & ary(1) & "\'and [年级代码] =\'" & ary(2) & "\'", "折总 DESC")
For n As Integer = 0 To drs.Count - 1 \'遍历所有行
If n > 0 AndAlso drs(n)("折总") = drs(n-1)("折总") Then \'如果总分和上一行相同
drs(n)("校序") = drs(n-1)("校序") \'则排名等于上一行
Else
drs(n)("校序") = n + 1 \'设置排名
End If
Next
Next
Dim Arys1 As List(Of String()) = dt.GetValues("考试名称|学校代码|年级代码|班级")
For Each Ary1 As String() In Arys1
Dim drs As List(Of DataRow) = dt.Sｅlect("[考试名称] = \'" & ary1(0) & "\'And [学校代码] = \'" & ary1(1) & "\'and [年级代码] =\'" & ary1(2) & "\'And [班级] = \'" & ary1(3) & "\'", "折总 DESC")
For m As Integer = 0 To drs.Count - 1 \'遍历所有行
If m > 0 AndAlso drs(m)("折总") = drs(m-1)("折总") Then \'如果总分和上一行相同
drs(m)("班序") = drs(m-1)("班序") \'则排名等于上一行
Else
drs(m)("班序") = m + 1 \'设置排名
End If
Next
Next
dt.save()
DataTables("成绩").load
-- 发布时间：2016/11/29 19:59:00
--
老师，各种都测了不行，请老师帮看下如何实现在不加载数据情况下也可在后台排序，另外保存速度很慢是什么原因。
-- 发布时间：2016/11/29 20:00:00
--
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-- 发布时间：2016/11/29 20:27:00
--
dt = cmd.ExecuteReader(true)
老师，发现了，加个true,现在的问题是排序太久了，5000多条记录花了几分钟，请问如何提高速度