专家坐堂-后台查找Foxtable(狐表) - 新一代数据库软件，完美融合Access、Foxpro、Excel、vb.net之优势，人人都能掌握的快速软件开发工具!

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-  Foxtable(狐表)  (http://foxtable.net/bbs/index.asp)
--  专家坐堂  (http://foxtable.net/bbs/list.asp?boardid=2)
----  后台查找  (http://foxtable.net/bbs/dispbbs.asp?boardid=2&id=92623)

--  作者：刘林
--  发布时间：2016/11/8 20:10:00
--  后台查找

Dim com4 As String = e.Form.Controls("combobox4").text
If com4 > ""
Dim Cols1() As String = {"学校名称","年级","班级","学生姓名","学生ID","学校标识码"}
Dim Cols2() As String = {"单位名称","年级代码","班级","姓名","学生ID","学校代码"}
Dim su As Integer = 0
Dim dr2 As DataRow
For Each dr1 As DataRow In DataTables("学生信息").DataRows
dr2 = DataTables("成绩").Find("学生ID = \'" & dr1("学生ID") & "\' and 考试名称 = \'" & com4 & "\'")
If dr2 Is Nothing Then dr2 = DataTables("成绩").AddNew()
For i As Integer = 0 To Cols1.Length -1
Select Case i
Case 0
dr2(Cols2(i)) = dr1(Cols1(i))
Case 1
dr2(Cols2(i)) = dr1(Cols1(i)).Substring(4,2)
Case 2
Dim c() As Char = {"级", "班"}
Dim str As String = dr1(Cols1(i))
Dim s1() As String = str.Split(c)
dr2(Cols2(i)) = s1(1).PadLeft(2,"0")
Case 3
dr2(Cols2(i)) = dr1(Cols1(i))
Case 4
dr2(Cols2(i)) = dr1(Cols1(i))
Case 5

dr2(Cols2(i)) = trim(dr1(Cols1(i))).Substring(6,4)
End Select
Next
dr2("考试名称") = com4
su = su +1
Next
Dim sux As String = "本次共导入学生" & su & "人"
MessageBox.show(sux,"导入总计",MessageBoxButtons.OK)

为防止重复增加相同记录，对同一次考试一个学生ID只能增加一次，上面代码仅当相同记录加载时可行，但重启系统因初始为不加载，这时可再增加相同记录，请问怎么办？

--  作者：有点蓝
--  发布时间：2016/11/8 20:14:00
--
sqlfind：http://www.foxtable.com/webhelp/scr/2911.htm

dr2 = DataTables("成绩").SQLFind("学生ID = \'" & dr1("学生ID") & "\' and 考试名称 = \'" & com4 & "\'")

--  作者：刘林
--  发布时间：2016/11/8 20:20:00
--
我之前试过，这样可连续加相同记录，如果用find还好，至少不能连续增加，是什么样原因

--  作者：有点蓝
--  发布时间：2016/11/8 20:30:00
--
只能是每增加一行就保存一下，不然后台是查不到的

Dim com4 As String = e.Form.Controls("combobox4").text
If com4 > ""
Dim Cols1() As String = {"学校名称","年级","班级","学生姓名","学生ID","学校标识码"}
Dim Cols2() As String = {"单位名称","年级代码","班级","姓名","学生ID","学校代码"}
Dim su As Integer = 0
Dim dr2 As DataRow
For Each dr1 As DataRow In DataTables("学生信息").DataRows
dr2 = DataTables("成绩").sqlFind("学生ID = \'" & dr1("学生ID") & "\' and 考试名称 = \'" & com4 & "\'")
If dr2 Is Nothing Then dr2 = DataTables("成绩").AddNew()
For i As Integer = 0 To Cols1.Length -1
Select Case i
Case 0
dr2(Cols2(i)) = dr1(Cols1(i))
Case 1
dr2(Cols2(i)) = dr1(Cols1(i)).Substring(4,2)
Case 2
Dim c() As Char = {"级", "班"}
Dim str As String = dr1(Cols1(i))
Dim s1() As String = str.Split(c)
dr2(Cols2(i)) = s1(1).PadLeft(2,"0")
Case 3
dr2(Cols2(i)) = dr1(Cols1(i))
Case 4
dr2(Cols2(i)) = dr1(Cols1(i))
Case 5

dr2(Cols2(i)) = trim(dr1(Cols1(i))).Substring(6,4)
End Select
Next
dr2("考试名称") = com4
su = su +1
dr2.Save
Next
Dim sux As String = "本次共导入学生" & su & "人"
MessageBox.show(sux,"导入总计",MessageBoxButtons.OK)

--  作者：刘林
--  发布时间：2016/11/8 20:39:00
--
哦对了，谢谢