frmresult.vb

我大2做的一个关于面向对象的课程设计

Imports System.Data
Imports System.Data.OleDb
Public Class frmResult
    Inherits System.Windows.Forms.Form
#Region " Windows 窗体设计器生成的代码 "

    Public Sub New()
        MyBase.New()

        '该调用是 Windows 窗体设计器所必需的。
        InitializeComponent()

        '在 InitializeComponent() 调用之后添加任何初始化

    End Sub

    '窗体重写 dispose 以清理组件列表。
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub

    'Windows 窗体设计器所必需的
    Private components As System.ComponentModel.IContainer

    '注意: 以下过程是 Windows 窗体设计器所必需的
    '可以使用 Windows 窗体设计器修改此过程。
    '不要使用代码编辑器修改它。
    Friend WithEvents lblNumber As System.Windows.Forms.Label
    Friend WithEvents lblName As System.Windows.Forms.Label
    Friend WithEvents lblClass As System.Windows.Forms.Label
    Friend WithEvents DataGrid1 As System.Windows.Forms.DataGrid
    Friend WithEvents b1 As System.Windows.Forms.Button
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.lblNumber = New System.Windows.Forms.Label
        Me.lblName = New System.Windows.Forms.Label
        Me.lblClass = New System.Windows.Forms.Label
        Me.DataGrid1 = New System.Windows.Forms.DataGrid
        Me.b1 = New System.Windows.Forms.Button
        CType(Me.DataGrid1, System.ComponentModel.ISupportInitialize).BeginInit()
        Me.SuspendLayout()
        '
        'lblNumber
        '
        Me.lblNumber.Location = New System.Drawing.Point(40, 24)
        Me.lblNumber.Name = "lblNumber"
        Me.lblNumber.Size = New System.Drawing.Size(80, 23)
        Me.lblNumber.TabIndex = 0
        '
        'lblName
        '
        Me.lblName.Location = New System.Drawing.Point(136, 24)
        Me.lblName.Name = "lblName"
        Me.lblName.Size = New System.Drawing.Size(64, 23)
        Me.lblName.TabIndex = 1
        '
        'lblClass
        '
        Me.lblClass.Location = New System.Drawing.Point(216, 24)
        Me.lblClass.Name = "lblClass"
        Me.lblClass.Size = New System.Drawing.Size(152, 23)
        Me.lblClass.TabIndex = 2
        '
        'DataGrid1
        '
        Me.DataGrid1.AlternatingBackColor = System.Drawing.Color.OldLace
        Me.DataGrid1.BackColor = System.Drawing.Color.OldLace
        Me.DataGrid1.BackgroundColor = System.Drawing.Color.Tan
        Me.DataGrid1.BorderStyle = System.Windows.Forms.BorderStyle.None
        Me.DataGrid1.CaptionBackColor = System.Drawing.Color.SaddleBrown
        Me.DataGrid1.CaptionForeColor = System.Drawing.Color.OldLace
        Me.DataGrid1.DataMember = ""
        Me.DataGrid1.FlatMode = True
        Me.DataGrid1.Font = New System.Drawing.Font("Tahoma", 8.0!)
        Me.DataGrid1.ForeColor = System.Drawing.Color.DarkSlateGray
        Me.DataGrid1.GridLineColor = System.Drawing.Color.Tan
        Me.DataGrid1.HeaderBackColor = System.Drawing.Color.Wheat
        Me.DataGrid1.HeaderFont = New System.Drawing.Font("Tahoma", 8.0!, System.Drawing.FontStyle.Bold)
        Me.DataGrid1.HeaderForeColor = System.Drawing.Color.SaddleBrown
        Me.DataGrid1.LinkColor = System.Drawing.Color.DarkSlateBlue
        Me.DataGrid1.Location = New System.Drawing.Point(16, 64)
        Me.DataGrid1.Name = "DataGrid1"
        Me.DataGrid1.ParentRowsBackColor = System.Drawing.Color.OldLace
        Me.DataGrid1.ParentRowsForeColor = System.Drawing.Color.DarkSlateGray
        Me.DataGrid1.ReadOnly = True
        Me.DataGrid1.SelectionBackColor = System.Drawing.Color.SlateGray
        Me.DataGrid1.SelectionForeColor = System.Drawing.Color.White
        Me.DataGrid1.Size = New System.Drawing.Size(336, 184)
        Me.DataGrid1.TabIndex = 5
        '
        'b1
        '
        Me.b1.Location = New System.Drawing.Point(136, 272)
        Me.b1.Name = "b1"
        Me.b1.Size = New System.Drawing.Size(88, 23)
        Me.b1.TabIndex = 6
        Me.b1.Text = "删除已选课程"
        '
        'frmResult
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(6, 14)
        Me.ClientSize = New System.Drawing.Size(368, 306)
        Me.Controls.Add(Me.b1)
        Me.Controls.Add(Me.DataGrid1)
        Me.Controls.Add(Me.lblClass)
        Me.Controls.Add(Me.lblName)
        Me.Controls.Add(Me.lblNumber)
        Me.MaximizeBox = False
        Me.Name = "frmResult"
        Me.Text = "frmResult"
        CType(Me.DataGrid1, System.ComponentModel.ISupportInitialize).EndInit()
        Me.ResumeLayout(False)

    End Sub

#End Region
    Dim SqlConn As String = "Provider=Microsoft.Jet.OLEDB.4.0;Password=;User ID=Admin;Data Source=计算机选课系统.mdb"
    Dim Conn As New OleDbConnection(SqlConn)
    Dim ds As New DataSet
    Dim comm As OleDbCommand
    Public Sub updatenow()
        Try
            ds.Clear()
            Dim sql1 As String = frmLogin.strStrdentNumber
            Dim sql2 As String = " select 课程号 from 选课表 where 学号 ='" & sql1 & "'"
            Dim sql As String = "select * from 课程 where 课程号 in(" & "" & sql2 & ")"

            Dim com As New OleDbCommand(sql)

            Dim Comm As New OleDbDataAdapter(sql, Conn)
            Comm.Fill(ds, "课程")
            Conn.Open()
            DataGrid1.DataSource = ds.Tables("课程").DefaultView
            DataGrid1.Refresh()
            Conn.Close()
        Catch ex As Exception
            MsgBox(Err.Description, MsgBoxStyle.Critical + MsgBoxStyle.OKOnly, "出错")
            Exit Try
        End Try
    End Sub
    Private Sub frmResult_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        lblNumber.Text &= frmLogin.strStrdentNumber
        lblName.Text &= frmLogin.strStrdentName
        lblClass.Text &= frmLogin.strStrdentClass
        updatenow()
    End Sub

    Private Sub cmdAdd_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)
        Dim curriculumform As New frmCurriculum
        curriculumform.ShowDialog(Me)

    End Sub

    Private Sub b1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles b1.Click
        del()
        updatenow()
    End Sub
    Sub del()
        Try
            Dim Strnum As String
            Strnum = InputBox("请输入要删除的课程号", "删除选课信息")
            If Strnum <> "" Then
                Dim td1 = CDbl(Strnum)
                Conn.Open()
                Dim StrSql As String = "Delete From 选课表 Where 课程号 = '" & td1 & "'"
                comm = New OleDbCommand(StrSql, Conn)
                comm.ExecuteNonQuery()
                Conn.Close()
                MsgBox("操作完成")
            Else : MsgBox("请输入正确信息")
            End If

        Catch ex As Exception
            MessageBox.Show(ex.Message)
            Conn.Close()
        End Try
    End Sub
End Class