c# - 如何备份 - 恢复 .mdf 数据库

Question

我用 vs2010 和 c# 开发了一个 windows 应用程序。我想知道一种以编程方式备份​​和恢复本地 mdf 数据库的方法。对于 sdf 数据库，我使用文件复制，但它似乎不适用于 mdf 文件。任何人都可以帮忙吗？

Answer 1

以这种方式尝试：

• 转到 Sql Management Studio 并选择要备份的数据库
• 右键单击并选择“任务”->“备份”
• 根据需要调整参数，但不要确认对话框
• 按下按钮 SCRIPT 并关闭对话框

• 在查询窗口中，在备份命令之前插入以下文本

  CREATE PROCEDURE DO_BACKUP  
  AS  
  BEGIN  
     -- HERE GOES THE BACKUP TEXT CREATED BY THE SCRIPT BUTTON   
     -- FOR EXAMPLE
     BACKUP DATABASE [Customers] 
     TO DISK = N'E:\backups\customers.bak' 
     WITH NOFORMAT, NOINIT,  
     NAME = N'Customers - Full Database Backup', 
     SKIP, NOREWIND, NOUNLOAD,  STATS = 10
  END  
  

并使用感叹号按钮执行（选择正确的数据库）。

现在您有了一个名为 DO_BACKUP 的存储过程，您可以使用普通的 ADO.NET 对象从代码中调用它，例如SqlConnection和SqlCommand

Answer 2

我为此苦苦挣扎，接受的答案并不能解决问题，所以这是一个对我有用的解决方案（感谢dnxit）

它可能会帮助某人。

备份

try
{
    var dlg = new System.Windows.Forms.FolderBrowserDialog();
    var result = dlg.ShowDialog(this.GetIWin32Window());

    if (result.ToString() == "OK")
    {
        var dbfileName = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData), "LibraryManger.mdf");
        var backupConn = new SqlConnection { ConnectionString = eb.GetConnectionString() };
        backupConn.Open();

        var backupcomm = backupConn.CreateCommand();
        var backupdb = $@"BACKUP DATABASE ""{dbfileName}"" TO DISK='{Path.Combine(dlg.SelectedPath,"LibraryManagement.bak")}'";
        var backupcreatecomm = new SqlCommand(backupdb, backupConn);
        backupcreatecomm.ExecuteNonQuery();
        backupConn.Close();

        MessageBox.Show($"Database backup has successfully stored in {Path.Combine(dlg.SelectedPath, "LibraryManagement.bak")}", "Confirmation");
    }
}
catch (Exception ex)
{
    if(ex.Message.Contains("Operating system error"))
    {
        MessageBox.Show("Please chose a public folder.", "Error", MessageBoxButton.OK, MessageBoxImage.Error);
    }
    else
        MessageBox.Show(ex.Message, "Error", MessageBoxButton.OK, MessageBoxImage.Error);
}

恢复

您必须在恢复之前关闭现有连接

try
{
    if (eb != null)
    {
        eb.DisposeConnection();
        eb = null;
    }

    var dlg = new OpenFileDialog();
    dlg.InitialDirectory = "C:\\";
    dlg.Filter = "Database file (*.bak)|*.bak";
    dlg.RestoreDirectory = true;

    if (Equals(dlg.ShowDialog(), true))
    {
        using (var con = new SqlConnection())
        {
            con.ConnectionString = @"Data Source=(LocalDB)\MSSQLLocalDB;Database=Master;Integrated Security=True;Connect Timeout=30;";
            con.Open();
            var dbfileName = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData), "LibraryManger.mdf");
                using (var cmd = new SqlCommand())
                {
                    cmd.Connection = con;
                    cmd.CommandText = $@"RESTORE DATABASE ""{dbfileName}"" FROM DISK='{dlg.FileName}'";

                    cmd.ExecuteNonQuery();
                }
                con.Close();
            }

        MessageBox.Show($"Database backup has successfully restored.", "Confirmation");
        eb = new EntityBroker.EntityBroker();
    }
}
catch (Exception ex)
{
    MessageBox.Show(ex.Message, "Error", MessageBoxButton.OK, MessageBoxImage.Error);
}