Public Class frmClass
    Inherits System.Windows.Forms.Form

#Region " Windows 窗體設計器生成的代碼 "

    Public Sub New()
        MyBase.New()

        '該調用是 Windows 窗體設計器所必需的。
        InitializeComponent()

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

    End Sub

    '窗體重寫 dispose 以清理組件列表。
    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 窗體設計器所必需的
    Private components As System.ComponentModel.IContainer

    '注意: 以下過程是 Windows 窗體設計器所必需的
    '可以使用 Windows 窗體設計器修改此過程。
    '不要使用代碼編輯器修改它。
    Friend WithEvents btnAdd As System.Windows.Forms.Button
    Friend WithEvents Label1 As System.Windows.Forms.Label
    Friend WithEvents Label2 As System.Windows.Forms.Label
    Friend WithEvents btnModify As System.Windows.Forms.Button
    Friend WithEvents btnDelete As System.Windows.Forms.Button
    Friend WithEvents btnConfirm As System.Windows.Forms.Button
    Friend WithEvents btnCancel As System.Windows.Forms.Button
    Friend WithEvents Label5 As System.Windows.Forms.Label
    Friend WithEvents stbClass As System.Windows.Forms.StatusBar
    Friend WithEvents cmbName As System.Windows.Forms.ComboBox
    Friend WithEvents txtCharge As System.Windows.Forms.TextBox
    Friend WithEvents txtMonitor As System.Windows.Forms.TextBox
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.stbClass = New System.Windows.Forms.StatusBar
        Me.cmbName = New System.Windows.Forms.ComboBox
        Me.btnAdd = New System.Windows.Forms.Button
        Me.txtCharge = New System.Windows.Forms.TextBox
        Me.Label1 = New System.Windows.Forms.Label
        Me.Label2 = New System.Windows.Forms.Label
        Me.txtMonitor = New System.Windows.Forms.TextBox
        Me.btnModify = New System.Windows.Forms.Button
        Me.btnDelete = New System.Windows.Forms.Button
        Me.btnConfirm = New System.Windows.Forms.Button
        Me.btnCancel = New System.Windows.Forms.Button
        Me.Label5 = New System.Windows.Forms.Label
        Me.SuspendLayout()
        '
        'stbClass
        '
        Me.stbClass.Location = New System.Drawing.Point(0, 149)
        Me.stbClass.Name = "stbClass"
        Me.stbClass.Size = New System.Drawing.Size(248, 24)
        Me.stbClass.TabIndex = 25
        '
        'cmbName
        '
        Me.cmbName.Location = New System.Drawing.Point(88, 16)
        Me.cmbName.Name = "cmbName"
        Me.cmbName.Size = New System.Drawing.Size(136, 20)
        Me.cmbName.TabIndex = 0
        '
        'btnAdd
        '
        Me.btnAdd.Location = New System.Drawing.Point(16, 112)
        Me.btnAdd.Name = "btnAdd"
        Me.btnAdd.Size = New System.Drawing.Size(40, 24)
        Me.btnAdd.TabIndex = 3
        Me.btnAdd.Text = "增加"
        '
        'txtCharge
        '
        Me.txtCharge.Location = New System.Drawing.Point(88, 71)
        Me.txtCharge.Name = "txtCharge"
        Me.txtCharge.Size = New System.Drawing.Size(136, 21)
        Me.txtCharge.TabIndex = 2
        Me.txtCharge.Text = ""
        '
        'Label1
        '
        Me.Label1.Location = New System.Drawing.Point(16, 44)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(56, 16)
        Me.Label1.TabIndex = 8
        Me.Label1.Text = "班長"
        '
        'Label2
        '
        Me.Label2.Location = New System.Drawing.Point(16, 72)
        Me.Label2.Name = "Label2"
        Me.Label2.Size = New System.Drawing.Size(56, 16)
        Me.Label2.TabIndex = 9
        Me.Label2.Text = "班主任"
        '
        'txtMonitor
        '
        Me.txtMonitor.Location = New System.Drawing.Point(88, 43)
        Me.txtMonitor.Name = "txtMonitor"
        Me.txtMonitor.Size = New System.Drawing.Size(136, 21)
        Me.txtMonitor.TabIndex = 1
        Me.txtMonitor.Text = ""
        '
        'btnModify
        '
        Me.btnModify.Location = New System.Drawing.Point(58, 112)
        Me.btnModify.Name = "btnModify"
        Me.btnModify.Size = New System.Drawing.Size(40, 24)
        Me.btnModify.TabIndex = 4
        Me.btnModify.Text = "修改"
        '
        'btnDelete
        '
        Me.btnDelete.Location = New System.Drawing.Point(100, 112)
        Me.btnDelete.Name = "btnDelete"
        Me.btnDelete.Size = New System.Drawing.Size(40, 24)
        Me.btnDelete.TabIndex = 5
        Me.btnDelete.Text = "刪除"
        '
        'btnConfirm
        '
        Me.btnConfirm.Location = New System.Drawing.Point(142, 112)
        Me.btnConfirm.Name = "btnConfirm"
        Me.btnConfirm.Size = New System.Drawing.Size(40, 24)
        Me.btnConfirm.TabIndex = 6
        Me.btnConfirm.Text = "確定"
        '
        'btnCancel
        '
        Me.btnCancel.Location = New System.Drawing.Point(184, 112)
        Me.btnCancel.Name = "btnCancel"
        Me.btnCancel.Size = New System.Drawing.Size(40, 24)
        Me.btnCancel.TabIndex = 7
        Me.btnCancel.Text = "取消"
        '
        'Label5
        '
        Me.Label5.Location = New System.Drawing.Point(16, 16)
        Me.Label5.Name = "Label5"
        Me.Label5.Size = New System.Drawing.Size(56, 16)
        Me.Label5.TabIndex = 12
        Me.Label5.Text = "班級名稱"
        '
        'frmClass
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(6, 14)
        Me.ClientSize = New System.Drawing.Size(248, 173)
        Me.Controls.Add(Me.stbClass)
        Me.Controls.Add(Me.cmbName)
        Me.Controls.Add(Me.btnAdd)
        Me.Controls.Add(Me.txtCharge)
        Me.Controls.Add(Me.Label1)
        Me.Controls.Add(Me.Label2)
        Me.Controls.Add(Me.txtMonitor)
        Me.Controls.Add(Me.btnModify)
        Me.Controls.Add(Me.btnDelete)
        Me.Controls.Add(Me.btnConfirm)
        Me.Controls.Add(Me.btnCancel)
        Me.Controls.Add(Me.Label5)
        Me.MaximizeBox = False
        Me.Name = "frmClass"
        Me.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen
        Me.Text = "班級管理"
        Me.ResumeLayout(False)

    End Sub

#End Region

    Private myDataSet As New DataSet
    Private index As Integer = -1

    Private Sub frmClass_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Dim i As Integer

        If OleConn.SelectQuery("select * from 班級信息", myDataSet) Then
            If myDataSet.Tables.Count > 0 Then
                For i = 0 To myDataSet.Tables(0).Rows.Count - 1
                    cmbName.Items.Add(myDataSet.Tables(0).Rows(i).Item("班名"))
                Next
                stbClass.Text = "就緒"
            Else
                stbClass.Text = "查詢班級信息表失敗"
            End If
        Else
            stbClass.Text = "查詢班級信息表失敗"
        End If
    End Sub

    Private Sub cmbName_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmbName.SelectedIndexChanged
        index = cmbName.SelectedIndex

        Dim dr As DataRow()
        Dim str As String

        Try
            str = "班名='" & cmbName.SelectedItem & "'"
            dr = myDataSet.Tables(0).Select(str)
            txtMonitor.Text = Trim(dr(0).Item("班長"))
            txtCharge.Text = Trim(dr(0).Item("班主任"))
            stbClass.Text = "就緒"
        Catch ex As Exception
            DisplayError(ex)
        End Try
    End Sub

    Private Sub btnAdd_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnAdd.Click
        Dim succ As Boolean = True

        If cmbName.Text <> "" Then
            Try
                Dim dr As DataRow = myDataSet.Tables(0).NewRow
                dr("班名") = cmbName.Text
                dr("班長") = txtMonitor.Text
                dr("班主任") = txtCharge.Text
                myDataSet.Tables(0).Rows.Add(dr)
                cmbName.Items.Add(cmbName.Text)
                cmbName.SelectedItem = cmbName.Text
                stbClass.Text = "增加成功"
            Catch ex As Exception
                succ = False
                DisplayError(ex)
            End Try

            If succ Then
                stbClass.Text = "增加成功"
            Else
                stbClass.Text = "增加失敗"
            End If
        Else
            stbClass.Text = "班級名稱不能為空"
        End If
    End Sub

    Private Sub btnModify_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnModify.Click
        Dim succ As Boolean = True

        If cmbName.Text <> "" Then
            If index >= 0 Then
                Dim dr As DataRow()
                Dim str As String

                Try
                    str = "班名='" & cmbName.Items.Item(index) & "'"
                    dr = myDataSet.Tables(0).Select(str)
                    dr(0).BeginEdit()
                    dr(0).Item("班名") = cmbName.Text
                    dr(0).Item("班長") = txtMonitor.Text
                    dr(0).Item("班主任") = txtCharge.Text
                    dr(0).EndEdit()
                    cmbName.Items.Item(index) = cmbName.Text
                Catch ex As Exception
                    succ = False
                    DisplayError(ex)
                End Try

                If succ Then
                    stbClass.Text = "修改成功"
                Else
                    stbClass.Text = "修改失敗"
                End If
            Else
                stbClass.Text = "請先選擇要修改的記錄"
            End If
        Else
            stbClass.Text = "班級名稱不能為空"
        End If
    End Sub

    Private Sub btnDelete_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnDelete.Click
        Dim succ As Boolean = True

        If cmbName.Text <> "" Then
            If index >= 0 Then
                Dim dr As DataRow()
                Dim str As String

                Try
                    str = "班名='" & cmbName.Items.Item(index) & "'"
                    dr = myDataSet.Tables(0).Select(str)
                    dr(0).Delete()
                    cmbName.Items.RemoveAt(index)
                    cmbName.Text = ""
                    txtMonitor.Text = ""
                    txtCharge.Text = ""
                Catch ex As Exception
                    succ = False
                    DisplayError(ex)
                End Try

                If succ Then
                    stbClass.Text = "修改成功"
                Else
                    stbClass.Text = "修改失敗"
                End If
            Else
                stbClass.Text = "請先選擇要刪除的記錄"
            End If
        Else
            stbClass.Text = "班級名稱不能為空"
        End If
    End Sub

    Private Sub btnConfirm_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnConfirm.Click
        Dim succ As Boolean = True

        Try
            OleConn.UpDate(myDataSet)
            myDataSet.AcceptChanges()
        Catch ex As Exception
            succ = False
        End Try

        If succ Then
            stbClass.Text = "更新數據庫成功"
        Else
            stbClass.Text = "更新數據庫失敗"
        End If
    End Sub

    Private Sub btnCancel_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCancel.Click
        Dim i As Integer

        myDataSet.RejectChanges()
        For i = 0 To myDataSet.Tables(0).Rows.Count - 1
            cmbName.Items.Add(myDataSet.Tables(0).Rows(i).Item("班名"))
        Next

        stbClass.Text = "你已經取消了所有的改動"
    End Sub
End Class