form8.frm

学生管理系统：包括查询

VERSION 5.00
Begin VB.Form Form6 
   BorderStyle     =   1  'Fixed Single
   Caption         =   "成绩修改"
   ClientHeight    =   4740
   ClientLeft      =   45
   ClientTop       =   435
   ClientWidth     =   6660
   LinkTopic       =   "Form6"
   MaxButton       =   0   'False
   MDIChild        =   -1  'True
   MinButton       =   0   'False
   ScaleHeight     =   4740
   ScaleWidth      =   6660
   Begin VB.CommandButton Command3 
      Caption         =   "退出"
      Height          =   855
      Left            =   4800
      TabIndex        =   8
      Top             =   3360
      Width           =   1335
   End
   Begin VB.CommandButton Command2 
      Caption         =   "保存"
      Height          =   855
      Left            =   2400
      TabIndex        =   7
      Top             =   3360
      Width           =   1215
   End
   Begin VB.CommandButton Command1 
      Caption         =   "修改"
      Height          =   855
      Left            =   360
      TabIndex        =   6
      Top             =   3360
      Width           =   1215
   End
   Begin VB.TextBox Text2 
      Height          =   735
      Left            =   4080
      TabIndex        =   5
      Top             =   600
      Width           =   1815
   End
   Begin VB.ComboBox Combo2 
      Height          =   300
      Left            =   840
      TabIndex        =   3
      Top             =   1800
      Width           =   1935
   End
   Begin VB.ComboBox Combo1 
      Height          =   300
      Left            =   840
      TabIndex        =   2
      Top             =   600
      Width           =   1935
   End
   Begin VB.Label Label4 
      BackStyle       =   0  'Transparent
      Caption         =   "成绩："
      Height          =   735
      Left            =   3240
      TabIndex        =   4
      Top             =   600
      Width           =   1095
   End
   Begin VB.Label Label2 
      BackStyle       =   0  'Transparent
      Caption         =   "课程："
      Height          =   855
      Left            =   240
      TabIndex        =   1
      Top             =   1800
      Width           =   975
   End
   Begin VB.Label Label1 
      BackStyle       =   0  'Transparent
      Caption         =   "学号："
      Height          =   495
      Left            =   240
      TabIndex        =   0
      Top             =   600
      Width           =   975
   End
   Begin VB.Image Image1 
      Height          =   4815
      Left            =   0
      Picture         =   "Form8.frx":0000
      Stretch         =   -1  'True
      Top             =   0
      Width           =   6735
   End
End
Attribute VB_Name = "Form6"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Dim conn As New ADODB.Connection
Dim mrc As New ADODB.Recordset

Private Sub Command1_Click()
Dim con As New ADODB.Connection
Dim mr As New ADODB.Recordset
Dim txtsql As String
txtsql = "select 学生基本信息表.学号 from 学生基本信息表  "
Set mr = executesql(txtsql)
 Do While Not mr.EOF
 Combo1.AddItem mr.Fields(0).Value
 mr.MoveNext
 Loop
  txtsql = "select 课程表.课程 from 课程表 "
  Set mr = executesql(txtsql)
 Do While Not mr.EOF
Combo2.AddItem mr.Fields(0).Value
 mr.MoveNext
 Loop
End Sub

Private Sub Command2_Click()
Dim txtsql As String
txtsql = "select * from 成绩表  "
Set mrc = executesql(txtsql)
Do While Not mrc.EOF
If mrc.Fields(1).Value = Combo1.Text And mrc.Fields(2).Value = Combo2.Text Then
 mrc.Fields(3).Value = Text2.Text
 mrc.Update
 Else
 mrc.MoveNext
End If
Loop
End Sub
Public Function executesql(ByVal sql As String) As ADODB.Recordset
Dim cnn As ADODB.Connection
Dim rst As ADODB.Recordset
Set cnn = New ADODB.Connection
Dim stokens() As String
stokens = Split(sql)
cnn.Open "Provider = Microsoft.Jet.OLEDB.4.0;Data Source=" & App.Path & "\student.mdb"
If InStr(" INSERT,DELETE,UPDATE", UCase$(stokens(0))) Then
cnn.Execute sql
Else
Set rst = New ADODB.Recordset
rst.Open Trim$(sql), cnn, adOpenKeyset, adLockOptimistic
Set executesql = rst
End If
End Function

Private Sub Command3_Click()
Me.Hide
End Sub

Private Sub Form_Load()
connstr = "Provider = Microsoft.Jet.OLEDB.4.0;Data Source=" & App.Path & "\student.mdb"
conn.Open connstr
End Sub