Imports System.Data
'引入數據庫操作類命名空間
Imports System.Data.OleDb
'引入ADO.NET操作命名空間

Public Class win_classifymanage
    Inherits System.Windows.Forms.Form
    Dim sqlstr As String 'SQL語句標記
    Dim objDS As DataSet '數據在內存中的緩存

    Dim i As Integer, classifyname As String

#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 GroupBox1 As System.Windows.Forms.GroupBox
    Friend WithEvents Label1 As System.Windows.Forms.Label
    Friend WithEvents tbclassify As System.Windows.Forms.TextBox
    Friend WithEvents Label4 As System.Windows.Forms.Label
    Friend WithEvents Button1 As System.Windows.Forms.Button
    Friend WithEvents Button2 As System.Windows.Forms.Button
    Friend WithEvents Button3 As System.Windows.Forms.Button
    Friend WithEvents lbclassify As System.Windows.Forms.ListBox
    Friend WithEvents Button4 As System.Windows.Forms.Button
    Friend WithEvents btadd As System.Windows.Forms.Button
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Dim resources As System.Resources.ResourceManager = New System.Resources.ResourceManager(GetType(win_classifymanage))
        Me.GroupBox1 = New System.Windows.Forms.GroupBox
        Me.btadd = New System.Windows.Forms.Button
        Me.Button4 = New System.Windows.Forms.Button
        Me.Button3 = New System.Windows.Forms.Button
        Me.Button2 = New System.Windows.Forms.Button
        Me.Button1 = New System.Windows.Forms.Button
        Me.Label4 = New System.Windows.Forms.Label
        Me.tbclassify = New System.Windows.Forms.TextBox
        Me.Label1 = New System.Windows.Forms.Label
        Me.lbclassify = New System.Windows.Forms.ListBox
        Me.GroupBox1.SuspendLayout()
        Me.SuspendLayout()
        '
        'GroupBox1
        '
        Me.GroupBox1.Controls.Add(Me.btadd)
        Me.GroupBox1.Controls.Add(Me.Button4)
        Me.GroupBox1.Controls.Add(Me.Button3)
        Me.GroupBox1.Controls.Add(Me.Button2)
        Me.GroupBox1.Controls.Add(Me.Button1)
        Me.GroupBox1.Controls.Add(Me.Label4)
        Me.GroupBox1.Controls.Add(Me.tbclassify)
        Me.GroupBox1.Controls.Add(Me.Label1)
        Me.GroupBox1.Controls.Add(Me.lbclassify)
        Me.GroupBox1.Location = New System.Drawing.Point(0, 0)
        Me.GroupBox1.Name = "GroupBox1"
        Me.GroupBox1.Size = New System.Drawing.Size(344, 224)
        Me.GroupBox1.TabIndex = 0
        Me.GroupBox1.TabStop = False
        Me.GroupBox1.Text = "分類信息"
        '
        'btadd
        '
        Me.btadd.Location = New System.Drawing.Point(152, 132)
        Me.btadd.Name = "btadd"
        Me.btadd.Size = New System.Drawing.Size(48, 24)
        Me.btadd.TabIndex = 2
        Me.btadd.Text = "添加"
        '
        'Button4
        '
        Me.Button4.Location = New System.Drawing.Point(280, 132)
        Me.Button4.Name = "Button4"
        Me.Button4.Size = New System.Drawing.Size(48, 24)
        Me.Button4.TabIndex = 4
        Me.Button4.Text = "刪除"
        '
        'Button3
        '
        Me.Button3.DialogResult = System.Windows.Forms.DialogResult.Cancel
        Me.Button3.Location = New System.Drawing.Point(280, 176)
        Me.Button3.Name = "Button3"
        Me.Button3.Size = New System.Drawing.Size(48, 24)
        Me.Button3.TabIndex = 6
        Me.Button3.Text = "關閉"
        '
        'Button2
        '
        Me.Button2.Location = New System.Drawing.Point(216, 176)
        Me.Button2.Name = "Button2"
        Me.Button2.Size = New System.Drawing.Size(48, 24)
        Me.Button2.TabIndex = 5
        Me.Button2.Text = "重置"
        '
        'Button1
        '
        Me.Button1.Location = New System.Drawing.Point(216, 132)
        Me.Button1.Name = "Button1"
        Me.Button1.Size = New System.Drawing.Size(48, 24)
        Me.Button1.TabIndex = 3
        Me.Button1.Text = "修改"
        '
        'Label4
        '
        Me.Label4.Location = New System.Drawing.Point(136, 108)
        Me.Label4.Name = "Label4"
        Me.Label4.Size = New System.Drawing.Size(200, 16)
        Me.Label4.TabIndex = 11
        Me.Label4.Text = "系統自動過濾 ' "" + & | 字符"
        Me.Label4.TextAlign = System.Drawing.ContentAlignment.MiddleCenter
        Me.Label4.UseMnemonic = False
        '
        'tbclassify
        '
        Me.tbclassify.Location = New System.Drawing.Point(208, 68)
        Me.tbclassify.MaxLength = 10
        Me.tbclassify.Name = "tbclassify"
        Me.tbclassify.Size = New System.Drawing.Size(104, 21)
        Me.tbclassify.TabIndex = 1
        Me.tbclassify.Text = ""
        '
        'Label1
        '
        Me.Label1.Location = New System.Drawing.Point(136, 68)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(72, 24)
        Me.Label1.TabIndex = 1
        Me.Label1.Text = "分類名："
        Me.Label1.TextAlign = System.Drawing.ContentAlignment.MiddleRight
        '
        'lbclassify
        '
        Me.lbclassify.ItemHeight = 12
        Me.lbclassify.Location = New System.Drawing.Point(8, 17)
        Me.lbclassify.Name = "lbclassify"
        Me.lbclassify.Size = New System.Drawing.Size(128, 196)
        Me.lbclassify.TabIndex = 7
        '
        'win_classifymanage
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(6, 14)
        Me.CancelButton = Me.Button3
        Me.ClientSize = New System.Drawing.Size(344, 229)
        Me.Controls.Add(Me.GroupBox1)
        Me.Icon = CType(resources.GetObject("$this.Icon"), System.Drawing.Icon)
        Me.MaximizeBox = False
        Me.MaximumSize = New System.Drawing.Size(352, 256)
        Me.MinimumSize = New System.Drawing.Size(352, 256)
        Me.Name = "win_classifymanage"
        Me.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen
        Me.Text = "圖書館管理系統--分類管理"
        Me.GroupBox1.ResumeLayout(False)
        Me.ResumeLayout(False)

    End Sub

#End Region

    Private Sub win_classifymanage_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        LoadData()
    End Sub

    Function LoadData()
        lbclassify.Items.Clear()
        sqlstr = "select * from classify"
        objDS = GetData(sqlstr)
        For i = 0 To objDS.Tables(0).Rows.Count - 1
            lbclassify.Items.Add(objDS.Tables(0).Rows(i)("name").ToString)
        Next
    End Function
    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
        Me.Close()
    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        tbclassify.Text = classifyname
        tbclassify.Focus()
    End Sub

    Private Sub lbclassify_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles lbclassify.SelectedIndexChanged
        tbclassify.Text = lbclassify.SelectedItem
        classifyname = lbclassify.SelectedItem
    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim newname As String, canupdate As Boolean = True
        newname = filter(Trim(tbclassify.Text))
        If newname = "" Then
            MessageBox.Show("分類名不能為空", "錯誤", MessageBoxButtons.OK, MessageBoxIcon.Information)
            tbclassify.Focus()
            canupdate = False
        End If

        If canupdate Then
            sqlstr = "update classify set name='" & newname & "' where name='" & classifyname & "'"
            objDS = GetData(sqlstr)
            tbclassify.Text = ""
            classifyname = ""
            LoadData()
            MessageBox.Show("修改成功", "操作成功", MessageBoxButtons.OK, MessageBoxIcon.Information)
        End If
    End Sub

    Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click
        If classifyname <> "" Then
            Try
                sqlstr = "delete from classify where name='" & classifyname & "'"
                UpdateData(sqlstr)
                tbclassify.Text = ""
                classifyname = ""
                LoadData()
                MessageBox.Show("數據庫更新成功", "操作成功", MessageBoxButtons.OK, MessageBoxIcon.Information)
            Catch
                MessageBox.Show("數據庫更新錯誤", "錯誤", MessageBoxButtons.OK, MessageBoxIcon.Information)
            End Try
        Else
            MessageBox.Show("沒有選擇分類", "操作錯誤", MessageBoxButtons.OK, MessageBoxIcon.Information)
        End If
    End Sub

    Private Sub btadd_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btadd.Click
        Dim newname As String, canupdate As Boolean = True
        newname = filter(Trim(tbclassify.Text))
        If newname = "" Then
            MessageBox.Show("分類名不能為空", "錯誤", MessageBoxButtons.OK, MessageBoxIcon.Information)
            tbclassify.Focus()
            canupdate = False
        Else
            sqlstr = "select * from classify where name = '" & newname & "'"
            objDS = GetData(sqlstr)
            If objDS.Tables(0).Rows.Count > 0 Then
                MessageBox.Show("分類名重復", "操作錯誤", MessageBoxButtons.OK, MessageBoxIcon.Information)
                tbclassify.Text = ""
                tbclassify.Focus()
                canupdate = False
            End If
        End If

        If canupdate Then
            sqlstr = "insert into classify(name) values('" & newname & "')"
            GetData(sqlstr)
            tbclassify.Text = ""
            LoadData()
            MessageBox.Show("添加成功", "操作成功", MessageBoxButtons.OK, MessageBoxIcon.Information)
        End If
    End Sub
End Class