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{/// <summary>/// 服务器/// </summary>private string server = "";public string Server{get { return this.server; }set { this.server = value; }}/// <summary>/// 登录名/// </summary>private string uid = "";public string UID{get { return this.uid; }set { this.uid = value; }}/// <summary>/// 登录密码/// </summary>private string pwd = "";public string PWD{get { return this.pwd; }set { this.pwd = value; }}/// <summary>/// 要操作的数据库/// </summary>private string database = "";public string Database{get { return this.database; }set { this.database = value; }}/// <summary>/// 数据库连接字符串/// </summary>private string conn = "";/// <summary>/// 备份路经/// </summary>private string backPath = "";public string BackPath{get { return this.backPath; }set { this.backPath = value; }}/// <summary>/// 还原文件路经/// </summary>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; }}/// <summary>/// DbBackUpAndRestore类的构造函数/// </summary>public DbBackUpAndRestore(){}/// <summary>/// 切割字符串/// </summary>/// <param name="str"></param>/// <param name="bg"></param>/// <param name="ed"></param>/// <returns></returns>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;}/// <summary>/// 构造文件名/// </summary>/// <returns>文件名</returns>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;}/// <summary>/// 数据库备份/// </summary>/// <returns>备份是否成功</returns>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();}}/// <summary>/// 数据库恢复/// </summary>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();}}}/// <summary>/// 杀死当前库的所有进程/// </summary>/// <returns></returns>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
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