C#实现SQL SERVER数据库备份的两种方法比较

先把代码贴上吧

 

using System; using System.Collections.Generic; using System.Text; using System.Data.SqlClient; using System.Data; using System.Windows.Forms; namespace DBAdmin { public class DbBackUpAndRestore { ///

/// 服务器 ///

private string server = ""; public string Server { get { return this.server; } set { this.server = value; } } ///

/// 登录名 ///

private string uid = ""; public string UID { get { return this.uid; } set { this.uid = value; } } ///

/// 登录密码 ///

private string pwd = ""; public string PWD { get { return this.pwd; } set { this.pwd = value; } } ///

/// 要操作的数据库 ///

private string database = ""; public string Database { get { return this.database; } set { this.database = value; } } ///

/// 数据库连接字符串 ///

private string conn = ""; ///

/// 备份路经 ///

private string backPath = ""; public string BackPath { get { return this.backPath; } set { this.backPath = value; } } ///

/// 还原文件路经 ///

private string restoreFile = ""; public string RestoreFile { get { return this.restoreFile; } set { this.restoreFile = value; } } private ProgressBar bar; public ProgressBar Bar { get { return bar; } set { bar = value; } } ///

/// DbBackUpAndRestore类的构造函数 ///

public DbBackUpAndRestore() { } ///

/// 切割字符串 ///

/// /// /// /// public string StringCut(string str, string bg, string ed) { string sub; sub = str.Substring(str.IndexOf(bg) + bg.Length); sub = sub.Substring(0, sub.IndexOf(";")); return sub; } ///

/// 构造文件名 ///

/// 文件名 private void CreatePath() { string CurrTime = System.DateTime.Now.ToString(); CurrTime = CurrTime.Replace("-", ""); CurrTime = CurrTime.Replace(":", ""); CurrTime = CurrTime.Replace(" ", ""); CurrTime = CurrTime.Substring(0, 12); backPath += "//_db_" + CurrTime + ".BAK"; } private void Step(string message, int percent) { Bar.Value = percent; } ///

/// 数据库备份 ///

/// 备份是否成功 public bool DbBackup() { CreatePath(); SQLDMO.Backup oBackup = new SQLDMO.BackupClass(); SQLDMO.SQLServer oSQLServer = new SQLDMO.SQLServerClass(); try { oSQLServer.LoginSecure = false; oSQLServer.Connect(server, uid, pwd); oBackup.Action = SQLDMO.SQLDMO_BACKUP_TYPE.SQLDMOBackup_Database; SQLDMO.BackupSink_PercentCompleteEventHandler pceh = new SQLDMO.BackupSink_PercentCompleteEventHandler(Step); oBackup.PercentComplete += pceh; oBackup.Database = database; oBackup.Files = backPath; oBackup.BackupSetName = database; oBackup.BackupSetDescription = "数据库备份"; oBackup.Initialize = true; oBackup.SQLBackup(oSQLServer); return true; } catch (Exception ex) { return false; throw ex; } finally { oSQLServer.DisConnect(); } } ///

/// 数据库恢复 ///

public string DbRestore() { if (exepro() != true) { return "操作失败"; } else { SQLDMO.Restore oRestore = new SQLDMO.RestoreClass(); SQLDMO.SQLServer oSQLServer = new SQLDMO.SQLServerClass(); try { exepro(); oSQLServer.LoginSecure = false; oSQLServer.Connect(server, uid, pwd); oRestore.Action = SQLDMO.SQLDMO_RESTORE_TYPE.SQLDMORestore_Database; SQLDMO.RestoreSink_PercentCompleteEventHandler pceh = new SQLDMO.RestoreSink_PercentCompleteEventHandler(Step); oRestore.PercentComplete += pceh; oRestore.Database = database; ///自行修改 oRestore.Files = restoreFile; oRestore.FileNumber = 1; oRestore.ReplaceDatabase = true; oRestore.SQLRestore(oSQLServer); return "数据库恢复成功"; } catch (Exception e) { return "恢复数据库失败，原因:" + e.Message; throw e; } finally { oSQLServer.DisConnect(); } } } ///

/// 杀死当前库的所有进程 ///

/// private bool exepro() { bool success = true; SQLDMO.SQLServer svr = new SQLDMO.SQLServerClass(); try { svr.Connect(server, uid, pwd); //取得所有的进程列表 SQLDMO.QueryResults qr = svr.EnumProcesses(-1); int iColPIDNum = -1; int iColDbName = -1; //找到和要恢复数据库相关的进程 for (int i = 1; i <= qr.Columns; i++) { string strName = qr.get_ColumnName(i); if (strName.ToUpper().Trim() == "SPID") { iColPIDNum = i; } else if (strName.ToUpper().Trim() == "DBNAME") { iColDbName = i; } if (iColPIDNum != -1 && iColDbName != -1) break; } //将相关进程关闭 for (int i = 1; i <= qr.Rows; i++) { int lPID = qr.GetColumnLong(i, iColPIDNum); string strDBName = qr.GetColumnString(i, iColDbName); if (strDBName.ToUpper() == database) svr.KillProcess(lPID); } } catch (Exception ex) { success = false; } return success; } public bool Operate(bool isBackup) { //备份：use master;backup database @name to disk=@path; //恢复：use master;restore database @name from disk=@path; SqlConnection connection = new SqlConnection("Data Source=" + server + ";initial catalog=" + database + ";user id=" + uid + ";password=" + pwd + ";"); if (!restoreFile.EndsWith(".bak")) { restoreFile += ".bak"; } if (isBackup)//备份数据库 { SqlCommand command = new SqlCommand("use master;backup database @name to disk=@path;", connection); connection.Open(); command.Parameters.AddWithValue("@name", Database); command.Parameters.AddWithValue("@path", restoreFile); command.ExecuteNonQuery(); connection.Close(); } else//恢复数据库 { SqlCommand command = new SqlCommand("use master;restore database @name from disk=@path;", connection); connection.Open(); command.Parameters.AddWithValue("@name", Database); command.Parameters.AddWithValue("@path", restoreFile); command.ExecuteNonQuery(); connection.Close(); } return true; } } }

 

第一种方法是利用库SQLDMO来进行数据库的备份和恢复。这种方法在恢复时，原数据不能正在使用当中，可以先把原数据库删除，适用于数据库误删除或者sql server数据库软件重装的情况下进行.当然这种情况下，发布时，必须把库SQLDMO打包。

 

第二种方式是通过调用sql指令来完成数据库的备份和还原。这种方法在恢复时，原数据必须存在，恢复时覆盖掉原数据库的数据。

 

备份的情况当然是数据库必须存在而且已经附加到数据库管理器中。

 

可以根据需要采用这两种方式