1、登錄界面圖4.1登錄界面設(shè)計(jì)過程：用于輸入用戶名和密碼登錄，選擇相應(yīng)的用戶類型進(jìn)入系統(tǒng)，若是用戶類型選擇錯(cuò)誤則不能進(jìn)入系統(tǒng)。沒有用戶名的可注冊用戶名，如對系統(tǒng)操作有不了解的可點(diǎn)擊幫助，進(jìn)入幫助界面。輸入用戶名和密碼后點(diǎn)擊確定判斷數(shù)據(jù)庫中的用戶是否為合法用戶。設(shè)計(jì)代碼：Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click '選擇普通用戶登錄 If Me.RadioButton1.Checked Then Dim str As S

2、tring str = "data source=PC-201103171305SQLEXPRESS;database=學(xué)生信息庫;user id=sa;pwd=" Dim con As New SqlClient.SqlConnection(str) Try con.Open() Catch ex As Exception End Try Dim sql As String = "select * from 普通用戶where 用戶名='" & TextBox1.Text.ToString().Trim() & "&#

3、39; and 密碼='" & TextBox2.Text.ToString().Trim() & " '" Dim cmd As New SqlClient.SqlCommand(sql, con) Dim reader As SqlClient.SqlDataReader Try reader = cmd.ExecuteReader If reader.Read() = True Then Dim 學(xué)生成績管理系統(tǒng)As New 學(xué)生信息管理系統(tǒng) 學(xué)生成績管理系統(tǒng).添加DToolStripMenuItem.Enabled = Fa

4、lse 學(xué)生成績管理系統(tǒng).修改KToolStripMenuItem.Enabled = False 學(xué)生成績管理系統(tǒng).刪除DToolStripMenuItem.Enabled = False 學(xué)生成績管理系統(tǒng).添加ToolStripMenuItem.Enabled = False 學(xué)生成績管理系統(tǒng).高級用戶信息管理ToolStripMenuItem.Enabled = False 學(xué)生成績管理系統(tǒng).Show() Me.Hide() Else MsgBox("對不起，用戶名或密碼錯(cuò)誤！重新輸入（請正確選擇用戶類型）", 16, "警告") Me.TextB

5、ox1.Text = "" Me.TextBox2.Text = "" TextBox1.Focus() End If Catch ex As Exception End Try End If '選擇高級用戶登錄 If Me.RadioButton2.Checked Then Dim str As String str = "data source=PC-201103171305SQLEXPRESS;database=學(xué)生信息庫;user id=sa;pwd=" Dim con As New SqlClient.SqlConn

6、ection(str) Try con.Open() Catch ex As Exception End Try Dim sql As String = "select * from 高級用戶where 用戶名='" & TextBox1.Text.ToString().Trim() & "' and 密碼='" & TextBox2.Text.ToString().Trim() & " '" Dim cmd As New SqlClient.SqlCommand(sql

7、, con) Dim reader As SqlClient.SqlDataReader Try reader = cmd.ExecuteReader If reader.Read() = True Then Dim 學(xué)生成績管理系統(tǒng)As New 學(xué)生信息管理系統(tǒng) 學(xué)生成績管理系統(tǒng).添加ToolStripMenuItem.Enabled = False 學(xué)生成績管理系統(tǒng).Show() Me.Hide() Else MsgBox("對不起，用戶名或密碼錯(cuò)誤！重新輸入（請正確選擇用戶類型）", 16, "警告") Me.TextBox1.Text = &qu

8、ot;" Me.TextBox2.Text = "" TextBox1.Focus() End If Catch ex As Exception End Try End If '選擇超級用戶登錄 If Me.RadioButton3.Checked Then Dim str As String str = "data source=PC-201103171305SQLEXPRESS;database=學(xué)生信息庫;user id=sa;pwd=" Dim con As New SqlClient.SqlConnection(str) Tr

9、y con.Open() Catch ex As Exception End Try Dim sql As String = "select * from 超級用戶where 用戶名='" & TextBox1.Text.ToString().Trim() & "' and 密碼='" & TextBox2.Text.ToString().Trim() & " '" Dim cmd As New SqlClient.SqlCommand(sql, con) Dim rea

10、der As SqlClient.SqlDataReader Try reader = cmd.ExecuteReader If reader.Read() = True Then Dim 學(xué)生成績管理系統(tǒng)As New 學(xué)生信息管理系統(tǒng) 學(xué)生成績管理系統(tǒng).Show() Me.Hide() Else MsgBox("對不起，用戶名或密碼錯(cuò)誤！重新輸入（請正確選擇用戶類型）", 16, "警告") Me.TextBox1.Text = "" Me.TextBox2.Text = "" TextBox1.Focus()

11、End If Catch ex As Exception End Try End If End Sub學(xué)生成績管理界面圖4.2學(xué)生成績管理界面設(shè)計(jì)過程：所有功能都在菜單中打開來實(shí)現(xiàn)。在登錄時(shí)選擇的用戶類型限制本界面功能使用的權(quán)限，不同的用戶類型所顯示可用的功能不一樣。普通用戶可使用界面管理功能、學(xué)生信息管理中的查詢功能、登錄用戶管理中的普通用戶管理功能；高級用戶擁有普通用戶所有功能使用的權(quán)限，外加登錄用戶管理中的高級用戶管理功能；超級用戶擁有高級用戶所有的功能使用的權(quán)限，外加超級用戶管理功能；所有登錄的用戶都可使用界面管理功能和幫助功能。不同的權(quán)限擁有不同的功能。設(shè)計(jì)代碼：Public Cla

12、ss 學(xué)生信息管理系統(tǒng)Private Sub 添加DToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles 添加DToolStripMenuItem.Click Dim tianjia As New 添加 tianjia.MdiParent = Me tianjia.Show() End SubPrivate Sub 修改KToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.

13、EventArgs) Handles 修改KToolStripMenuItem.Click Dim xiugai As New 修改 xiugai.MdiParent = Me xiugai.Show() End SubPrivate Sub 刪除DToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles 刪除DToolStripMenuItem.Click Dim shanchu As New 刪除 shanchu.MdiParent = Me shanchu.Sho

14、w() End SubPrivate Sub 退出XToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles 退出XToolStripMenuItem.Click End End SubPrivate Sub 返回ToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles 返回ToolStripMenuItem.Click 登陸界面.Show()

15、Me.Close() End SubPrivate Sub 信息查詢ToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Dim chaxun As New 查詢 chaxun.MdiParent = Me chaxun.Show() End SubPrivate Sub 添加ToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles 添加ToolStripM

16、enuItem.Click Dim yonghuguanli As New 用戶信息管理 yonghuguanli.MdiParent = Me yonghuguanli.Show() End SubPrivate Sub 查詢ToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles 查詢ToolStripMenuItem.Click Dim chaxun As New 查詢 chaxun.MdiParent = Me chaxun.Show() End SubPriv

17、ate Sub 窗口層疊ToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles 窗口層疊ToolStripMenuItem.Click Me.LayoutMdi(MdiLayout.Cascade) End SubPrivate Sub 水平平鋪ToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles 水平平鋪ToolStripMenuItem

18、.Click Me.LayoutMdi(MdiLayout.TileHorizontal) End SubPrivate Sub 垂直平鋪ToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles 垂直平鋪ToolStripMenuItem.Click Me.LayoutMdi(MdiLayout.TileVertical) End SubPrivate Sub 修改密碼ToolStripMenuItem_Click(ByVal sender As System.Obje

19、ct, ByVal e As System.EventArgs) Handles 修改密碼ToolStripMenuItem.Click Dim 修改密碼As New 高級用戶密碼修改 修改密碼.MdiParent = Me 修改密碼.Show() End SubPrivate Sub 修改普通用戶ToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles 修改普通用戶ToolStripMenuItem.Click Dim 修改密碼As New 普通用戶密碼修改 修改密碼

20、.MdiParent = Me 修改密碼.Show() End SubPrivate Sub 幫助ToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles 幫助ToolStripMenuItem.Click Dim 幫助As New 幫助文件 幫助.MdiParent = Me 幫助.Show() End SubEnd Class學(xué)生信息管理學(xué)生信息添加圖4.3.1學(xué)生信息添加學(xué)生基本信息添加設(shè)計(jì)過程：選擇學(xué)生信息添加，在相應(yīng)的欄目填入或選擇相應(yīng)的內(nèi)容，點(diǎn)擊添加后數(shù)據(jù)存

21、入學(xué)生信息表。點(diǎn)擊退出則退出整個(gè)管理系統(tǒng)，點(diǎn)擊返回則退回到學(xué)生成績管理界面。（選擇學(xué)生信息添加后學(xué)生成績添加為不可用）設(shè)計(jì)代碼：Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click If Me.TextBox1.Text.Trim = String.Empty Then MessageBox.Show("學(xué)號不能為空", "添加失敗", MessageBoxButtons.OK, Message

22、BoxIcon.Error) ElseIf Me.TextBox2.Text.Trim = String.Empty Then MessageBox.Show("姓名不能為空", "添加失敗", MessageBoxButtons.OK, MessageBoxIcon.Error) Else Dim str As String = "select * from 學(xué)生信息表" & " where 學(xué)號='" & Me.TextBox1.Text.Trim & "'&q

23、uot; If link(str).Rows.Count = 0 Then str = Nothing str = "insert into 學(xué)生信息表" & " (學(xué)號,姓名,年齡,班級,籍貫,性別) values ('" & Me.TextBox1.Text.Trim & "','" & Me.TextBox2.Text.Trim & "','" & Me.TextBox5.Text.Trim & "

24、9;,'" & ComboBox3.Text.Trim & "','" & Me.ComboBox2.Text.Trim & "','" & ComboBox1.Text.Trim & "')" link(str) xuehao() End If str = "select * from 成績表" & " where 學(xué)號='" & Me.TextBox1.Text.

25、Trim & "'" If link(str).Rows.Count = 0 Then str = Nothing str = "insert into 成績表(學(xué)號,姓名) values ('" & Me.TextBox1.Text.Trim & "','" & Me.TextBox2.Text.Trim & "')" link(str) xuehao() End If str = "select * from 成績表&qu

26、ot; & " where 學(xué)號='" & Me.TextBox1.Text.Trim & "'" If link(str).Rows.Count = 0 Then str = Nothing str = "insert into 成績表(學(xué)號,姓名) values ('" & Me.TextBox1.Text.Trim & "','" & Me.TextBox2.Text.Trim & "')&quo

27、t; link(str) MessageBox.Show("學(xué)生信息表記錄" & Me.TextBox1.Text & "已成功", "添加成功", MessageBoxButtons.OK, MessageBoxIcon.Information) xuehao() Else MessageBox.Show("記錄" & Me.TextBox1.Text & "已存在", "添加失敗", MessageBoxButtons.OK, Messag

28、eBoxIcon.Error) End If End IfEnd Sub學(xué)生成績信息添加設(shè)計(jì)過程：選擇學(xué)生成績添加，在相應(yīng)的欄目選擇添加內(nèi)容（上學(xué)期、下學(xué)期、科目、學(xué)號、成績），點(diǎn)擊添加后數(shù)據(jù)存入學(xué)生成績表（成績表1或者成績表2）。點(diǎn)擊退出則退出整個(gè)管理系統(tǒng)，點(diǎn)擊返回則退回到學(xué)生成績管理界面。（選擇學(xué)生成績添加后學(xué)生信息添加為不可用）設(shè)計(jì)代碼：Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click If Me.txt_chengji.T

29、ext.Trim = String.Empty Then MessageBox.Show("成績不能為空", "添加失敗", MessageBoxButtons.OK, MessageBoxIcon.Error) Else If Me.cb_xueqi.SelectedIndex = 0 Then Str = "update 成績表set " & Me.cb_kecheng.Text.Trim & "= '" & Me.txt_chengji.Text.Trim & &quo

30、t;' where 學(xué)號='" & Me.cb_xuehao.Text.Trim & "'" If Int(Me.txt_chengji.Text.Trim) >= 0 And Int(Me.txt_chengji.Text.Trim) <= 100 Then link(Str) MessageBox.Show("記錄添加已成功", "添加成功", MessageBoxButtons.OK, MessageBoxIcon.Information) xuehao() Else

31、 MessageBox.Show("記錄成績已存在", "添加失敗", MessageBoxButtons.OK, MessageBoxIcon.Error) End If ElseIf Me.cb_xueqi.SelectedIndex = 1 Then Str = "update 成績表set " & Me.cb_kecheng1.Text.Trim & "= '" & Me.txt_chengji.Text.Trim & "' where 學(xué)號=

32、9;" & Me.cb_xuehao.Text.Trim & "'" If Int(Me.txt_chengji.Text.Trim) >= 0 And Int(Me.txt_chengji.Text.Trim) <= 100 Then link(Str) MessageBox.Show("記錄添加已成功", "添加成功", MessageBoxButtons.OK, MessageBoxIcon.Information) xuehao() Else MessageBox.Show(&qu

33、ot;記錄成績已存在", "添加失敗", MessageBoxButtons.OK, MessageBoxIcon.Error) End If End If End If End Sub學(xué)生信息修改圖4.3.2學(xué)生信息修改學(xué)生基本信息修改設(shè)計(jì)過程：選擇修改信息類型為學(xué)生信息，在相應(yīng)的欄目選擇或填入相應(yīng)的內(nèi)容（學(xué)號、類型、修改內(nèi)容）。點(diǎn)擊修改讀取數(shù)據(jù)庫中的學(xué)生信息表的相應(yīng)內(nèi)容，改為填入的所要修改的內(nèi)容。設(shè)計(jì)代碼：Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.Eve

34、ntArgs) Handles Button1.Click If Me.RadioButton3.Checked Then str = "update 學(xué)生信息表set " & Me.ComboBox4.Text.Trim & "='" & Me.TextBox1.Text.Trim & "' where 學(xué)號='" & Me.ComboBox3.Text.Trim & "'" End If If Not link(str).Rows.

35、Count Then MessageBox.Show("修改成功！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Question) End IfEnd Sub學(xué)生成績信息修改設(shè)計(jì)過程：選擇修改信息類型為學(xué)生成績，在相應(yīng)的欄目選擇或填入相應(yīng)的內(nèi)容（學(xué)號、選擇課程、改成績）。點(diǎn)擊修改讀取數(shù)據(jù)庫中的成績表的相應(yīng)內(nèi)容，改為填入的所要修改的內(nèi)容。設(shè)計(jì)代碼：Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArg

36、s) Handles Button3.Click If Me.RadioButton1.Checked Then str = "update 成績表set " & Me.ComboBox1.Text.Trim & "='" & Me.TextBox4.Text.Trim & "' where 學(xué)號='" & Me.ComboBox5.Text.Trim & "'" ElseIf Me.RadioButton2.Checked Then

37、str = "update 成績表set " & Me.ComboBox2.Text.Trim & "='" & Me.TextBox4.Text.Trim & "' where 學(xué)號='" & Me.ComboBox5.Text.Trim & "'" End If If Not link(str).Rows.Count Then If Int(Me.TextBox4.Text.Trim) >= 0 And Int(Me.Text

38、Box4.Text.Trim) <= 100 Then MessageBox.Show("修改成功！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Question) Else MsgBox("對不起，您輸入的成績有誤！請重新輸入", 16, "警告") End If End If End Sub學(xué)生信息刪除圖4.3.3學(xué)生信息刪除設(shè)計(jì)過程：選擇所要刪除的信息類型，在學(xué)號欄目選擇相應(yīng)的學(xué)號。點(diǎn)擊刪除，則在相應(yīng)的表中刪除信息。設(shè)計(jì)代碼：Private Sub Butt

39、on1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click If Me.RadioButton1.Checked Then Dim str As String = "delete from 成績表where 學(xué)號='" & ComboBox1.Text.Trim & "'" link(str) MessageBox.Show("刪除記錄" & ComboBox1.Text

40、& "成功", "刪除成功", MessageBoxButtons.OK, MessageBoxIcon.Information) tianxuehao() End If If Me.RadioButton2.Checked Then Dim str As String = "delete from 成績表where 學(xué)號='" & ComboBox1.Text.Trim & "'" link(str) MessageBox.Show("刪除記錄" &am

41、p; ComboBox1.Text & "成功", "刪除成功", MessageBoxButtons.OK, MessageBoxIcon.Information) tianxuehao() End If If Me.RadioButton3.Checked Then Dim str As String = "delete from 學(xué)生信息表where 學(xué)號='" & ComboBox1.Text.Trim & "'" link(str) MessageBox.Show(

42、"刪除記錄" & ComboBox1.Text & "成功", "刪除成功", MessageBoxButtons.OK, MessageBoxIcon.Information) tianxuehao() End IfEnd Sub5.3.4學(xué)生信息查詢圖4.3.4學(xué)生信息查詢設(shè)計(jì)過程：選擇查詢的學(xué)生信息類型，輸入所要查詢的學(xué)生學(xué)號，點(diǎn)擊查詢即可，在下面會顯示你所查詢學(xué)生信息。點(diǎn)擊刷新能及時(shí)更新最新的學(xué)生信息。設(shè)計(jì)代碼：Private Sub Button1_Click(ByVal sender As System.O

43、bject, ByVal e As System.EventArgs) Handles Button1.Click If Me.RadioButton1.Checked Then xh = "select * from 成績表where 學(xué)號='" & Me.TextBox2.Text.Trim & "' " ElseIf Me.RadioButton2.Checked Then xh = "select * from 成績表where 學(xué)號='" & Me.TextBox2.Text.

44、Trim & "' " ElseIf Me.RadioButton3.Checked Then xh = "select * from 學(xué)生信息表where 學(xué)號='" & Me.TextBox2.Text.Trim & "' " End If tianxuehao()End SubPrivate Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Cl

45、ick Me.TextBox2.Text = "" If Me.RadioButton1.Checked Then xh = "select * from 成績表" tianxuehao() ElseIf Me.RadioButton2.Checked Then xh = "select * from 成績表" tianxuehao() ElseIf Me.RadioButton3.Checked Then xh = "select * from 學(xué)生信息表" tianxuehao() End IfEnd Sub登

46、錄用戶管理普通用戶管理圖4.4.1普通用戶管理設(shè)計(jì)過程：在普通用戶密碼修改界面，輸入所要修改的自己或者別人的用戶名，填入新的密碼，點(diǎn)擊提交即可修改相應(yīng)的用戶名密碼。設(shè)計(jì)代碼：Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click xh = "select * from 普通用戶 where 用戶名='" & Me.TextBox1.Text.Trim & "' "

47、If Me.TextBox2.Text.Trim = String.Empty Then MessageBox.Show("密碼不能為空", "添加失敗", MessageBoxButtons.OK, MessageBoxIcon.Error) Else str = "update 普通用戶 set 密碼='" & Me.TextBox2.Text.Trim & "'where 用戶名='" & Me.TextBox1.Text.Trim & "&#

48、39;" If Not link(str).Rows.Count Then MessageBox.Show("修改普通用戶密碼成功！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Question) End If End IfEnd Sub高級用戶管理圖4.4.2高級用戶管理設(shè)計(jì)過程：在高級用戶密碼修改界面，輸入所要修改的自己或者別人的用戶名，填入新的密碼，點(diǎn)擊提交即可修改相應(yīng)的用戶名密碼。設(shè)計(jì)代碼：Private Sub Button1_Click(ByVal sender As System.Ob

49、ject, ByVal e As System.EventArgs) Handles Button1.Click xh = "select * from 高級用戶 where 用戶名='" & Me.TextBox1.Text.Trim & "' " If Me.TextBox2.Text.Trim = String.Empty Then MessageBox.Show("密碼不能為空", "添加失敗", MessageBoxButtons.OK, MessageBoxIcon.Er

50、ror) Else Str = "update 高級用戶 set 密碼='" & Me.TextBox2.Text.Trim & "'where 用戶名='" & Me.TextBox1.Text.Trim & "'" If Not link(Str).Rows.Count Then MessageBox.Show("修改高級用戶密碼成功！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Q

51、uestion) End If End IfEnd Sub超級用戶管理圖4.4.3超級用戶管理設(shè)計(jì)過程：正確選擇所要操作的用戶類型，在用戶信息管理界面可添加用戶、修改用戶、刪除用戶、查詢用戶等功能，這是一個(gè)只有超級用戶才擁有的權(quán)限功能，這個(gè)界面功能可操作學(xué)生成績管理系統(tǒng)的用戶登錄信息，方面了超級用戶對用戶名和密碼的管理。設(shè)計(jì)代碼：用戶添加代碼：Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click If Me.TextBox1.Text

52、.Trim = String.Empty Then MessageBox.Show("用戶名不能為空", "添加失敗", MessageBoxButtons.OK, MessageBoxIcon.Error) ElseIf Me.TextBox2.Text.Trim = String.Empty Then MessageBox.Show("密碼不能為空", "添加失敗", MessageBoxButtons.OK, MessageBoxIcon.Error) End If If Me.RadioButton1.Ch

53、ecked Then Dim str As String = "select * from 普通用戶" & " where 用戶名='" & Me.TextBox1.Text.Trim & "'" If link(str).Rows.Count = 0 Then str = Nothing str = "insert into 普通用戶" & " (用戶名,密碼) values ('" & Me.TextBox1.Text.Trim

54、 & "','" & Me.TextBox2.Text.Trim & "')" link(str) MessageBox.Show("普通用戶" & Me.TextBox1.Text & "已成功", "添加成功", MessageBoxButtons.OK, MessageBoxIcon.Information) Else MessageBox.Show("記錄" & Me.TextBox1.Text

55、& "已存在", "添加失敗", MessageBoxButtons.OK, MessageBoxIcon.Error) End If End If If Me.RadioButton2.Checked Then Dim str As String = "select * from 高級用戶" & " where 用戶名='" & Me.TextBox1.Text.Trim & "'" If link(str).Rows.Count = 0 Then str = Nothing str = "insert into 高級用戶" & " (用戶名,密碼) values ('" & Me.TextBox1.Text.Trim & "','" & Me.TextBox2.Text.Trim & "')" link(st