结束语
 经过三个多月的设计，学生信息管理系统基本设计完毕。其功能基本符合要求，能够完成学生信息的存储输入修改查询等功能。由于毕业设计时较短，所该系统还有许多不尽如人意的地方，比如用户界面不够美观，出错处理不够等多方面问题。这些都有进一步改善。
                  
致谢
 在本次毕业设计中，我从指导老师身上学到了很多东西。老师认真负责的工作态度，严谨的治学精神深厚的理论水平都使我收益匪浅。他无论在理论上还是实践中，都给与我很大帮助，使得到不少的提高，这对于我以后的工作和学习都有一种巨大的帮助，感谢他耐心的辅导。另外，同组的同学同样给与我不少帮助，这里一并表示感谢。

参考文献
[1] 《Visual Basic 6.0程序设计教程》
[2] 《 Visual Basic 6.0程序员指南》
[3] 《VB6开发宝典》
[4] 《Visual Basic 6.0使用指南》
[5] 《Visual Basic 6.0中文控件大全》
[6] 《VB和SQL Server编程指南》

软件全部源程序
........................................ 系统公用模块 ..............................................

Public fMainForm As frmMain
Public UserName As String

Sub Main()
Dim fLogin As New frmLogin
fLogin.Show vbModal
If Not fLogin.OK Then
'Login Failed so exit app
End
End If
Unload fLogin

Set fMainForm = New frmMain
fMainForm.Show
End Sub

.........................................................................................................
Public Function ConnectString() _
As String
'returns a DB ConnectString
ConnectString = "FileDSN=studentinfo.dsn;UID=sa;PWD="
End Function

.......................................... SQL语句执行程序 ..............................................
Public Function ExecuteSQL(ByVal SQL _
As String, MsgString As String) _
As ADODB.Recordset
'executes SQL and returns Recordset
Dim cnn As ADODB.Connection
Dim rst As ADODB.Recordset
Dim sTokens() As String

On Error GoTo ExecuteSQL_Error

sTokens = Split(SQL)
Set cnn = New ADODB.Connection
cnn.Open ConnectString
If InStr("INSERT,DELETE,UPDATE", _
UCase$(sTokens(0))) Then
cnn.Execute SQL
MsgString = sTokens(0) & _
" query successful"
Else
Set rst = New ADODB.Recordset
rst.Open Trim$(SQL), cnn, _
adOpenKeyset, _
adLockOptimistic
'rst.MoveLast 'get RecordCount
Set ExecuteSQL = rst
MsgString = "查询到" & rst.RecordCount & _
" 条记录 "
End If
ExecuteSQL_Exit:
Set rst = Nothing
Set cnn = Nothing
Exit Function

ExecuteSQL_Error:
MsgString = "查询错误: " & _
Err.Description
Resume ExecuteSQL_Exit
End Function

.........................................................................................................

Public Function Testtxt(txt As String) As Boolean
If Trim(txt) = "" Then
Testtxt = False
Else
Testtxt = True
End If
End Function

　
 
.................................. frmlogin窗口 ...........................................

Option Explicit
Private Declare Function GetUserName Lib "advapi32.dll" Alias "GetUserNameA" (ByVal lpbuffer As String, nSize As Long) As Long

Public OK As Boolean
'记录确定次数
Dim miCount As Integer
Private Sub Form_Load()
Dim sBuffer As String
Dim lSize As Long

sBuffer = Space$(255)
lSize = Len(sBuffer)
Call GetUserName(sBuffer, lSize)
If lSize > 0 Then
txtUserName.Text = ""

Else
txtUserName.Text = vbNullString
End If

OK = False
miCount = 0
End Sub

Private Sub cmdCancel_Click()
OK = False
Me.Hide
End Sub

Private Sub cmdOK_Click()
Dim txtSQL As String
Dim mrc As ADODB.Recordset
Dim MsgText As String
'T
oDo: create test for correct password
'check for correct password

UserName = ""
If Trim(txtUserName.Text = "") Then
MsgBox "没有这个用户，请重新输入用户名！", vbOKOnly + vbExclamation, "警告"
txtUserName.SetFocus
Else
txtSQL = "select * from user_Info where user_ID = '" & txtUserName.Text & "'"
Set mrc = ExecuteSQL(txtSQL, MsgText)
If mrc.EOF = True Then
MsgBox "没有这个用户，请重新输入用户名!", vbOKOnly + vbExclamation, "警告"
txtUserName.SetFocus
Else
If Trim(mrc.Fields(1)) = Trim(txtPassword.Text) Then
OK = True
mrc.Close
Me.Hide
UserName = Trim(txtUserName.Text)
Else
MsgBox "输入密码不正确，请重新输入！", vbOKOnly + vbExclamation, "警告"
txtPassword.SetFocus
txtPassword.Text = ""
End If
End If
End If

miCount = miCount + 1
If miCount = 3 Then
Me.Hide
End If
Exit Sub
End Sub

............................................................................................
 
............................... frmMain 系统主窗口代码 .........................................
Private Sub addcinfoMenu_Click()
frmAddclassinfo.Show
End Sub
Private Sub addcourseMenu_Click()
frmAddcourseinfo.Show
End Sub

Private Sub addresultMenu_Click()
frmAddresult.Show
End Sub

Private Sub addsinfoMenu_Click()
frmAddsinfo.Show
End Sub

Private Sub adduserMenu_Click()
frmAdduser.Show
sbStatusBar.Panels(1).Text = "添加用户"
End Sub

Private Sub exitMenu_Click()
End
End Sub

Private Sub exitsinfoMenu_Click()
Unload frminquireinfo
End Sub

Private Sub gradecourseMenu_Click()
frmSetcourseinfo.Show
End Sub

Private Sub inquireresultMenu_Click()
frmInquireresult.Show
End Sub

Private Sub inquiresinfoMenu_Click()
frmInquiresinfo.Show
End Sub

Private Sub MDIForm_Load()
Me.Left = GetSetting(App.Title, "Settings", "MainLeft", 1000)
Me.Top = GetSetting(App.Title, "Settings", "MainTop", 1000)
Me.Width = GetSetting(App.Title, "Settings", "MainWidth", 6500)
Me.Height = GetSetting(App.Title, "Settings", "MainHeight", 6500)

End Sub

Private Sub MDIForm_Unload(Cancel As Integer)
If Me.WindowState <> vbMinimized Then
SaveSetting App.Title, "Settings", "MainLeft", Me.Left
SaveSetting App.Title, "Settings", "MainTop", Me.Top
SaveSetting App.Title, "Settings", "MainWidth", Me.Width
SaveSetting App.Title, "Settings", "MainHeight", Me.Height
End If
End Sub

Private Sub modifycinfoMenu_Click()
frmModifyclassinfo.Show
End Sub

Private Sub modifycourseMenu_Click()
frmModifycourseinfo.Show
End Sub

Private Sub modifypwdMenu_Click()
frmModifyuserinfo.Show
End Sub

Private Sub modifyresultMenu_Click()
frmModifyresult.Show
End Sub

Private Sub modifysinfo_Menu_Click()
frmModifysinfo.Show
End Sub
..........................................................................................................
 
............................... frmAdduser 添加用户窗口代码 .....................................

Private Sub cmdCancel_Click()
Unload Me
End Sub

Private Sub cmdOK_Click()
Dim txtSQL As String
Dim mrc As ADODB.Recordset
Dim MsgText As String

If Trim(Text1(0).Text) = "" Then
MsgBox "请输入用户名称！", vbOKOnly + vbExclamation, "警告"
Exit Sub
Text1(0).SetFocus
Else
txtSQL = "select * from user_Info "
Set mrc = ExecuteSQL(txtSQL, MsgText)
While (mrc.EOF = False)
If Trim(m
rc.Fields(0)) = Trim(Text1(0)) Then
MsgBox "用户已经存在，请重新输入用户名！", vbOKOnly + vbExclamation, "警告"
Text1(0).SetFocus
Text1(0).Text = ""
Text1(1).Text = ""
Text1(2).Text = ""
Exit Sub
Else
mrc.MoveNext
End If
Wend
End If

If Trim(Text1(1).Text) <> Trim(Text1(2).Text) Then
MsgBox "两次输入密码不一样，请确认！", vbOKOnly + vbExclamation, "警告"
Text1(1).SetFocus
Text1(1).Text = ""
Text1(2).Text = ""
Exit Sub

Else
If Text1(1).Text = "" Then
MsgBox "密码不能为空！", vbOKOnly + vbExclamation, "警告"
Text1(1).SetFocus
Text1(1).Text = ""
Text1(2).Text = ""
Else
mrc.AddNew
mrc.Fields(0) = Trim(Text1(0).Text)
mrc.Fields(1) = Trim(Text1(1).Text)
mrc.Update
mrc.Close
Me.Hide
MsgBox "添加用户成功！", vbOKOnly + vbExclamation, "添加用户"
End If
End If
End Sub

.........................................................................................................
 
............................... frmAddsinfo 添加学籍信息窗口代码 .................................
Private Sub Command1_Click()
Dim mrc As ADODB.Recordset
Dim txtSQL As String
Dim MsgText As String

If Not Testtxt(txtSID.Text) Then
MsgBox "请输入学号！", vbOKOnly + vbExclamation, "警告"
txtSID.SetFocus
Exit Sub
End If

If Not Testtxt(txtName.Text) Then
MsgBox "请输入姓名！", vbOKOnly + vbExclamation, "警告"
txtName.SetFocus
Exit Sub
End If

If Not Testtxt(comboSex.Text) Then
MsgBox "请选择性别?quot;, vbOKOnly + vbExclamation, "警告"
comboSex.SetFocus
Exit Sub
End If

If Not Testtxt(txtBorndate.Text) Then
MsgBox "请输入出生日期！", vbOKOnly + vbExclamation, "警告"
txtBorndate.SetFocus
Exit Sub
End If

If Not Testtxt(comboClassNo.Text) Then
MsgBox "请选择班号！", vbOKOnly + vbExclamation, "警告"
comboClassNo.SetFocus
Exit Sub
End If

If Not Testtxt(txtTel.Text) Then
MsgBox "请输入联系电话！", vbOKOnly + vbExclamation, "警告"
txtTel.SetFocus
Exit Sub
End If

If Not Testtxt(txtRudate.Text) Then
MsgBox "请输入入校日期！", vbOKOnly + vbExclamation, "警告"
txtRudate.SetFocus
Exit Sub
End If

If Not Testtxt(txtAddress.Text) Then
MsgBox "请输入家庭住址！", vbOKOnly + vbExclamation, "警告"
txtAddress.SetFocus
Exit Sub
End If

If Not IsNumeric(Trim(txtSID.Text)) Then
MsgBox "请输入数字！", vbOKOnly + vbExclamation, "警告"
Exit Sub
txtSID.SetFocus
End If

txtSQL = "select * from student_Info where student_ID = '" & Trim(txtSID.Text) & "'"
Set mrc = ExecuteSQL(txtSQL, MsgText)
If mrc.EOF = False Then
MsgBox "学号重复，请重新输入！", vbOKOnly + vbExclamation, "警告"
mrc.Close
txtSID.SetFocus
Else
mrc.Close
If Not IsDate(txtBorndate.Text) Then
MsgBox "出生时间应输入日期格式（yyyy-mm-dd）！", vbOKOnly + vbExclamation, "警告"
txtBorndate.SetFocus
Else
txtBorndate = Format(txtBorndate, "yyyy-mm-dd")
If Not IsDate(txtRudate.Text) Then
MsgBox "入校时间应输入日期格式（yyyy-mm-dd）！", vbOKOnly + vbExclamation, "警告"
txtRudate.SetFocus
Else
txtRudate = Format(txtRudate, "yyyy-mm-dd")
txtSQL = "select * from student_Info"
Set mrc = ExecuteSQL(txtSQL, MsgText)
mrc.AddNew
mrc.Fields(0) = Trim(txtSID.Text)
mrc.Fields(1) = Trim(txtName.Text)
mrc.Fields(2) = Trim(comboSex.Text)
mrc.Fields(3) = Trim(txtBorndate.Text)
mrc.Fields(4) = Trim(comboClassNo.T

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