成绩查询.frm

初学vb,做的第一个系统.一个星期内看vb并做完这个系统的.

VERSION 5.00
Object = "{67397AA1-7FB1-11D0-B148-00A0C922E820}#6.0#0"; "MSADODC.OCX"
Begin VB.Form search_grade 
   BorderStyle     =   1  'Fixed Single
   Caption         =   "成绩查询"
   ClientHeight    =   5460
   ClientLeft      =   3765
   ClientTop       =   2805
   ClientWidth     =   8205
   LinkTopic       =   "Form1"
   MaxButton       =   0   'False
   ScaleHeight     =   5460
   ScaleWidth      =   8205
   Begin MSAdodcLib.Adodc Adodc1 
      Height          =   330
      Left            =   3120
      Top             =   5280
      Visible         =   0   'False
      Width           =   1695
      _ExtentX        =   2990
      _ExtentY        =   582
      ConnectMode     =   0
      CursorLocation  =   3
      IsolationLevel  =   -1
      ConnectionTimeout=   15
      CommandTimeout  =   30
      CursorType      =   3
      LockType        =   3
      CommandType     =   8
      CursorOptions   =   0
      CacheSize       =   50
      MaxRecords      =   0
      BOFAction       =   0
      EOFAction       =   0
      ConnectStringType=   1
      Appearance      =   1
      BackColor       =   -2147483643
      ForeColor       =   -2147483640
      Orientation     =   0
      Enabled         =   -1
      Connect         =   "Provider=MSDASQL.1;Persist Security Info=False;Data Source=stu_manage"
      OLEDBString     =   "Provider=MSDASQL.1;Persist Security Info=False;Data Source=stu_manage"
      OLEDBFile       =   ""
      DataSourceName  =   ""
      OtherAttributes =   ""
      UserName        =   "sa"
      Password        =   "manager"
      RecordSource    =   ""
      Caption         =   "Adodc1"
      BeginProperty Font {0BE35203-8F91-11CE-9DE3-00AA004BB851} 
         Name            =   "宋体"
         Size            =   9
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      _Version        =   393216
   End
   Begin VB.ListBox List2 
      Height          =   3660
      Left            =   4440
      TabIndex        =   9
      Top             =   1440
      Width           =   3375
   End
   Begin VB.CommandButton Command2 
      Caption         =   "查询"
      Height          =   495
      Left            =   6480
      TabIndex        =   8
      Top             =   840
      Width           =   1215
   End
   Begin VB.TextBox Text1 
      Height          =   375
      Left            =   5280
      TabIndex        =   7
      Top             =   240
      Width           =   1455
   End
   Begin VB.CommandButton Command1 
      Caption         =   "查询"
      Height          =   495
      Left            =   2520
      TabIndex        =   5
      Top             =   240
      Width           =   1215
   End
   Begin VB.ComboBox Combo1 
      Height          =   300
      Left            =   1080
      Style           =   2  'Dropdown List
      TabIndex        =   2
      Top             =   240
      Width           =   975
   End
   Begin VB.ListBox List1 
      Height          =   3660
      Left            =   240
      TabIndex        =   0
      Top             =   1440
      Width           =   3375
   End
   Begin VB.Label student_name 
      Height          =   255
      Left            =   4320
      TabIndex        =   10
      Top             =   960
      Width           =   1455
   End
   Begin VB.Label Label4 
      Caption         =   "学    号"
      Height          =   255
      Left            =   4320
      TabIndex        =   6
      Top             =   360
      Width           =   735
   End
   Begin VB.Label sub_name 
      Height          =   255
      Left            =   1080
      TabIndex        =   4
      Top             =   840
      Width           =   2655
   End
   Begin VB.Label Label2 
      Caption         =   "课程名称"
      Height          =   255
      Left            =   240
      TabIndex        =   3
      Top             =   840
      Width           =   735
   End
   Begin VB.Label Label1 
      Caption         =   "课程编号"
      Height          =   255
      Left            =   240
      TabIndex        =   1
      Top             =   360
      Width           =   735
   End
   Begin VB.Line Line1 
      X1              =   4080
      X2              =   4080
      Y1              =   240
      Y2              =   5040
   End
End
Attribute VB_Name = "search_grade"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Option Explicit

    Public rs As New ADODB.Recordset
    Public adoconn As New ADODB.Connection 'Connection 对象代表了打开与数据源的连接。
    
    Public sub_id As String
    Public stu_no As String
'选择课程编号后，课程名称显示出来
Private Sub Combo1_Click()
    Dim i As Integer
    sub_id = Combo1.Text
    
    If Len(sub_id) <> 0 Then
        adoconn.Open
        rs.Open "select * from subject where id='" & sub_id & "'", adoconn
        If sub_id = rs.Fields("id") Then
            sub_name.Caption = rs.Fields("name")
        End If
        rs.Close
        adoconn.Close
    End If
End Sub
'按课程编号查询
Private Sub Command1_Click()
    List1.clear
    
    '获取编号
    sub_id = Combo1.Text
    If Len(sub_id) = 0 Then
        MsgBox "请选择课程编号！"
        Combo1.SetFocus
        Exit Sub
    End If
    
    '查询数据并显示
    adoconn.Open
    rs.Open "select * from grade where sub_id='" & sub_id & "'", adoconn
    
    '没有任何数据
    If rs.RecordCount = 0 Then
        MsgBox "该科目没有任何成绩！"
        List1.clear
        rs.Close
        adoconn.Close
        Exit Sub
    End If
    
    '找到数据
    List1.AddItem Space(3) & "学号" & Space(12) & "成绩"
    Dim i As Integer
    rs.MoveFirst
    For i = 0 To rs.RecordCount - 1
        List1.AddItem rs.Fields("stu_no") & Space(18) & rs.Fields("grade")
        rs.MoveNext
    Next i
    rs.Close
    adoconn.Close
End Sub
'按学号查询
Private Sub Command2_Click()
    stu_no = Text1.Text
    If Len(stu_no) = 0 Then
        MsgBox "请输入学号！"
        Text1.SetFocus
        Exit Sub
    End If
    
    adoconn.Open
    rs.Open "select * from stu where no='" & stu_no & "'", adoconn
    If rs.RecordCount = 0 Then
        MsgBox "没有该学生信息！"
        student_name.Caption = ""
        Text1.Text = ""
        List2.clear
        Text1.SetFocus
        rs.Close
        adoconn.Close
        Exit Sub
    End If
    student_name.Caption = "姓名：" & rs.Fields("name")
    rs.Close
    
    rs.Open "select * from grade where stu_no='" & stu_no & "'", adoconn
    If rs.RecordCount = 0 Then
        MsgBox "没有该学生的成绩！"
        List2.clear
        Text1.Text = ""
        student_name = ""
        Text1.SetFocus
        rs.Close
        adoconn.Close
        Exit Sub
    End If
    rs.Close
    
    Dim i As Integer
    List2.clear
    List2.AddItem Space(2) & "课程名称" & Space(15) & "成绩"
    rs.Open "select name,grade from subject,grade where id=sub_id and stu_no='" & stu_no & "'", adoconn
    rs.MoveFirst
    For i = 0 To rs.RecordCount - 1
        List2.AddItem Format(rs.Fields("name"), "####################") & Format(rs.Fields("grade"), "@@@@@@@@@@@@@@@@@@@@@@@")
        rs.MoveNext
    Next i
    
    rs.Close
    adoconn.Close
End Sub

'打开窗体时，加载课程编号下拉列表
Private Sub Form_Load()
    adoconn.ConnectionString = Adodc1.ConnectionString 'Adodc1为窗体中的ADO控件，并已成功连接数据库
    adoconn.Open
    Set rs = New ADODB.Recordset
    rs.CursorLocation = adUseClient
    rs.CursorType = adOpenKeyset
    rs.LockType = adLockOptimistic
    
    Dim i As Integer
    rs.Open "select * from subject", adoconn
    If rs.RecordCount = 0 Then
        rs.Close
        adoconn.Close
        Exit Sub
    End If
    
    rs.MoveFirst
    For i = 0 To rs.RecordCount - 1
        Combo1.AddItem rs.Fields("id")
        rs.MoveNext
    Next i
    rs.Close
    adoconn.Close
End Sub