database_backup.vb

图书管理系统

Imports System.Data.SqlClient
Public Class DataBase_Backup
    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 Button1 As System.Windows.Forms.Button
    Friend WithEvents Button2 As System.Windows.Forms.Button
    Friend WithEvents Button3 As System.Windows.Forms.Button
    Friend WithEvents OpenFileDialog1 As System.Windows.Forms.OpenFileDialog
    Friend WithEvents Label2 As System.Windows.Forms.Label
    Friend WithEvents TextBox2 As System.Windows.Forms.TextBox
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.Button1 = New System.Windows.Forms.Button
        Me.Button2 = New System.Windows.Forms.Button
        Me.Button3 = New System.Windows.Forms.Button
        Me.OpenFileDialog1 = New System.Windows.Forms.OpenFileDialog
        Me.Label2 = New System.Windows.Forms.Label
        Me.TextBox2 = New System.Windows.Forms.TextBox
        Me.SuspendLayout()
        '
        'Button1
        '
        Me.Button1.Location = New System.Drawing.Point(392, 56)
        Me.Button1.Name = "Button1"
        Me.Button1.TabIndex = 0
        Me.Button1.Text = "浏览"
        '
        'Button2
        '
        Me.Button2.Location = New System.Drawing.Point(104, 160)
        Me.Button2.Name = "Button2"
        Me.Button2.TabIndex = 1
        Me.Button2.Text = "开始备份"
        '
        'Button3
        '
        Me.Button3.Location = New System.Drawing.Point(304, 160)
        Me.Button3.Name = "Button3"
        Me.Button3.TabIndex = 4
        Me.Button3.Text = "退出"
        '
        'Label2
        '
        Me.Label2.Location = New System.Drawing.Point(16, 64)
        Me.Label2.Name = "Label2"
        Me.Label2.Size = New System.Drawing.Size(104, 23)
        Me.Label2.TabIndex = 5
        Me.Label2.Text = "确定备份设备路径"
        '
        'TextBox2
        '
        Me.TextBox2.Location = New System.Drawing.Point(144, 56)
        Me.TextBox2.Name = "TextBox2"
        Me.TextBox2.Size = New System.Drawing.Size(232, 21)
        Me.TextBox2.TabIndex = 6
        Me.TextBox2.Text = ""
        '
        'DataBase_Backup
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(6, 14)
        Me.BackColor = System.Drawing.SystemColors.ActiveBorder
        Me.ClientSize = New System.Drawing.Size(496, 237)
        Me.Controls.Add(Me.TextBox2)
        Me.Controls.Add(Me.Label2)
        Me.Controls.Add(Me.Button3)
        Me.Controls.Add(Me.Button2)
        Me.Controls.Add(Me.Button1)
        Me.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedDialog
        Me.MaximizeBox = False
        Me.Name = "DataBase_Backup"
        Me.Text = "数据库备份"
        Me.ResumeLayout(False)

    End Sub

#End Region
   
    Dim FileName As String
    Dim FileString As String
    Private Function BackUpDataBase() As Boolean
        Dim result As Boolean = False
        Try
            If mycon.State = ConnectionState.Closed Then
                mycon.Open()
            End If
            Dim sqlstr As String = "BackUp DataBase homework To Disk='" & TextBox2.Text & "'"
            Dim mycom1 As New SqlCommand(sqlstr, mycon)
            mycom1.ExecuteNonQuery()
            result = True
            Return result
        Catch ex As Exception
            MessageBox.Show(ex.Message)
        End Try
    End Function
    Private Sub CheckDirectory()
        Try
            OpenFileDialog1.Title = "数据库备份"
            OpenFileDialog1.InitialDirectory = "D:\数据库备份\"
            If OpenFileDialog1.ShowDialog = DialogResult.OK Then
                FileString = OpenFileDialog1.FileName
                FileString = FileString
                TextBox2.Text = FileString
            End If
        Catch ex As Exception
            MessageBox.Show(ex.Message)
        End Try
    End Sub
    Private Sub DataBase_Backup_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        TextBox2.Focus()
        TextBox2.Text = "C:\BackUp\homework.bak"
    End Sub

    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
        Me.Close()
    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        '浏览代码的按钮
        CheckDirectory()
    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        '备份按钮的代码
        If TextBox2.Text = "" Then
            MessageBox.Show("请指定有效的备份文件路径!", "提醒", MessageBoxButtons.OK, MessageBoxIcon.Warning)
            Exit Sub
        End If
        If BackUpDataBase() = True Then
            MessageBox.Show("备份成功!", "恭喜", MessageBoxButtons.OK, MessageBoxIcon.Warning)
        End If
    End Sub
End Class