每个系统都应该有数据库的备份和还原功能，以防各种情况下的数据库损坏造成不可挽回的损失。

这个功能挺简单，但在代码实现过程中也多多少少遇到了些问题，我把错误都总结了出来，供大家参考学习。 下面先给出正确的代码实现： Imports System.Data.SqlClient

每个系统都应该有数据库的备份和还原功能，以防各种情况下的数据库损坏造成不可挽回的损失。这个功能挺简单，但在代码实现过程中也多多少少遇到了些问题，我把错误都总结了出来，供大家参考学习。

下面先给出正确的代码实现：

Imports System.Data.SqlClientPublic Class Form1    '备份数据库     'BACKUP DATABASE Test TO DISK='' WITH Format   sql语句    Private Sub btnBackup_Click(sender As Object, e As EventArgs) Handles btnBackup.Click        Dim conn As SqlConnection        conn = New SqlConnection("Data Source=.;Initial Catalog=test3;User ID=sa;Password=123456")        Dim cmd As SqlCommand        Dim path As String        '选择备份路径        FolderBrowserDialog1.ShowDialog()        path = FolderBrowserDialog1.SelectedPath        If path = Nothing Then            MessageBox.Show("文件名不能为空", "系统提示")            Exit Sub        End If        '执行sql命令语句，备份数据库        cmd = New SqlCommand("BACKUP DATABASE test3 TO DISK='" & path & "\backup' WITH format,BACKUP LOG WITH NORECOVERY", conn)        conn.Open()        Try            cmd.ExecuteNonQuery()        Catch ex As Exception            MsgBox(ex.Message, MsgBoxStyle.OkOnly, "系统提示")            Exit Sub        End Try        MsgBox("备份成功")        conn.Close()    End Sub    '还原数据库    Private Sub btnRecovery_Click(sender As Object, e As EventArgs) Handles btnRecovery.Click        If MsgBox("真的要还原吗？数据会恢复到最近备份的数据！", MsgBoxStyle.YesNo, "系统提示") = MsgBoxResult.Yes Then            Dim cn As New SqlConnection            Dim cn1 As New SqlConnection            Dim mydr As SqlDataReader            Dim str As String            Dim tmpConnectionString As String = "Data Source=.;Initial Catalog=test3;User ID=sa;Password=123456;pooling=false"            Dim all As String            '获取当前文件名筛选器字符            Me.OpenFileDialog1.Filter = "所有文件(*.*)|*.*|备份文件(*.bak)|*.bak"            Me.OpenFileDialog1.ShowDialog()            all = OpenFileDialog1.FileName            If all = Nothing Then                MessageBox.Show("文件名不能为空", "系统提示")                Exit Sub            End If            cn.ConnectionString = tmpConnectionString            cn1.ConnectionString = tmpConnectionString            cn.Open()            cn1.Open()            '查询与数据库有关的进程            Dim cm As SqlCommand = New SqlCommand("use master select spid from master..sysprocesses where dbid=db_id('test3')", cn)            mydr = cm.ExecuteReader()            Dim cm1 As SqlCommand = New SqlCommand()            cm1.Connection = cn1            While (mydr.Read())                '杀死进程                str = "kill " & mydr("spid").ToString()                cm1.CommandText = str                cm1.CommandType = CommandType.Text                Application.DoEvents()                cm1.ExecuteNonQuery()            End While            mydr.Close()            '使要还原的数据库脱机            cm = New SqlCommand("ALTER DATABASE test3 SET OFFLINE WITH ROLLBACK IMMEDIATE", cn)            cm.ExecuteNonQuery()            '恢复备份            cm = New SqlCommand("RESTORE DATABASE test3 FROM DISK='" & all & "' WITH REPLACE", cn)            cm.ExecuteNonQuery()            '使要还原的数据库联机            cm = New SqlCommand("ALTER DATABASE test3 SET ONLINE WITH ROLLBACK IMMEDIATE", cn)            cm.ExecuteNonQuery()            MsgBox("恢复成功,软件自动关闭，请重新启动本系统！")            '关闭数据库连接            cn.Close()            cn1.Close()            Me.Close()        Else            Exit Sub        End If    End SubEnd Class

错误代码一：

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