此文章主要向大家讲述的是在那种情况下会出现SQL Server数据库中SMO备份数据库进度条不显示,同时存在一个十分奇怪的问题,用SMO备份SQL Server数据库时不显示进度条,也就是进度条事件PercentComplete不触发。
今天试了一下,果然有点奇怪。
一个奇怪的问题,用SMO备份SQL Server数据库时不显示进度条,也就是进度条事件PercentComplete不触发。
今天试了一下,果然有点奇怪。
代码如下:
- using Microsoft.SqlServer.Management.Smo;
- using Microsoft.SqlServer.Management.Common;
- private void btnBackup_Click(object sender, EventArgs e)
- {
- btnBackup.Enabled = false;
- Thread tr = new Thread(new ThreadStart(doBackup));
- tr.Priority = ThreadPriority.AboveNormal;
- tr.Start();
- //Thread.Sleep(3000);
- }
- /// <summary>
- /// 备份数据库
- /// </summary>
- public void doBackup()
- {
- pbDemo.Value = 0;
- pbDemo.Maximum = 100;
- pbDemo.Style = ProgressBarStyle.Blocks;
- //pbDemo.Step = 10;
- Server srv = new Server(@"(local)");
- Backup backup = new Backup();
- backup.Action = BackupActionType.Database;
- backup.Database = "btnet";
- backup.Incremental = false;
- backup.Devices.Add(new BackupDeviceItem(@"C:\agronet09.bak", DeviceType.File));
- backup.Initialize = true;
- backup.PercentCompleteNotification = 10;
- backup.PercentComplete += new PercentCompleteEventHandler(backup_PercentComplete);
- //backup.Checksum = true;
- backup.SqlBackup(srv);
- }
- public void backup_PercentComplete(object sender, Microsoft.SqlServer.Management.Smo.PercentCompleteEventArgs e)
- {
- this.Invoke(new displayProgress_delegate(displayProgress), e.Percent);
- //Application.DoEvents();
- }
- public delegate void displayProgress_delegate(int progress);
- public void displayProgress(int progress)
- {
- this.lbProgress.Text = "已完成[" + progress.ToString() + " %]";
- pbDemo.Value = progress;
- btnBackup.Enabled = (progress == 100);
- }
症状如下:结果正确执行,但进度条不显示。
刚开始以为是线程问题,后来发现不是这个原因。
又试了另外一段代码
- using Microsoft.SqlServer.Management.Smo;
- using Microsoft.SqlServer.Management.Common;
- using System.Diagnostics;
- static void Main(string[] args)
- {
- BackupDatabase("ap4\\agronet09", "agronet2008", "c:\\Northind_3.bak");
- Console.WriteLine(Environment.NewLine + "Press any key to continue.");
- Console.ReadKey();
- }
- public static void BackupDatabase(string serverName, string databaseName, string fileName)
- {
- Console.WriteLine("*** Backing up ***");
- Server server = new Server(serverName);
- Backup backup = new Backup();
- backup.Action = BackupActionType.Database;
- backup.Database = databaseName;
- backup.Incremental = false;
- backup.Initialize = true;
- backup.LogTruncation = BackupTruncateLogType.Truncate;
- BackupDeviceItem backupItemDevice = new BackupDeviceItem(fileName, DeviceType.File);
- backup.Devices.Add(backupItemDevice);
- backup.PercentCompleteNotification = 10;
- backup.PercentComplete += backup_PercentComplete;
- backup.Complete +=backup_Complete;
- backup.SqlBackup(server);
- }
- protected static void backup_PercentComplete(object sender, PercentCompleteEventArgs e)
- {
- Console.WriteLine(e.Percent + "% processed.");
- //Application.();
- System.Threading.Thread.Sleep(1000);
- }
- protected static void backup_Complete(object sender, ServerMessageEventArgs e)
- {
- Console.WriteLine(Environment.NewLine + e.ToString());
- }
结果还是不显示。
后来突然想到会不会是文件太小,试了一个200M的数据文件,果然成功显示:
后来经反复实验,发现SQL server 2000约在数据文件加日志文件大于6M左右时显示进度条。
而Sql server 2008 r2大约在3M时显示进度条。可能跟机器也有关系。
以上的相关内容就是对SQL Server数据库中SMO备份数据库进度条的介绍,望你能有所收获。
【编辑推荐】
- C#来对SQL Server存储过程进行创建
- SQL Server索引实际结构的理解
- 添加Microsoft SQL Server 2000 Desktop Engine
- 安装MS SQL Server 2000失败的缘由是什么?
- Sql Server 日期格式化之函数GETDATE() 代码