SQLDMO.dll是随SQL Server2000一起发布的。SQLDMO.dll自身是一个COM对象
SQLDMO（SQL Distributed Management Objects，SQL分布式管理对象）封装 Microsoft SQL Server 2000 数据库中的对象。SQL-DMO 允许用支持自动化或 COM 的语言编写应用程序，以管理 SQL Server 安装的所有部分。SQL-DMO 是 SQL Server 2000 中的 SQL Server 企业管理器所使用的应用程序接口 (API)；因此使用 SQL-DMO 的应用程序可以执行 SQL Server 企业管理器执行的所有功能。
SQLServer的大致关系：
Application-->SQLServer-->DataBase
实例SQLDMO，主要用到的是其中的以下几个类：
SQLDMO.Application(使用 SQLDMO.ApplicationClass创建）、
SQLDMO.SQLServer(使用SQLDMO.SQLServerClass创建，主要用到它的Connect来连接数据库服务器）、
SQLDMO.NameList(可以通过它和Application获取服务器集合，其它的请看其API）
SQLDMO.DataBase(可以通过它和SQLServer.DataBases获取数据库集合）
个人实现的数据库备份与还原的关键代码:
///文件名:SqlServerBackupRestore.cs
///功能:备份与还原SqlServer数据库
///作者：杨春
///最后修改日期:2008-11-25 22:35:00
using System;
using System.Data.SqlClient;
/// <summary>
///SqlServerBackupRestore 的摘要说明
///SqlServer数据的备份与还原
/// </summary>
public class SqlServerBackupRestore:IDisposable
{
private string _serverName = string.Empty;
private string _userId = string.Empty;
private string _userPassword = string.Empty;
private string _databaseName = string.Empty;
private string _backFile = string.Empty;
SQLDMO.SQLServerClass server = null;
SQLDMO.BackupClass backup = null;
SQLDMO.RestoreClass restore = null;
/// <summary>
/// SqlServer备份还原
/// </summary>
public SqlServerBackupRestore()
{
}
/// <summary>
/// SqlServer备份还原
/// </summary>
/// <param name="connectionString">数据库连接字符串</param>
/// <param name="backFile">备份文件名</param>
public SqlServerBackupRestore(string connectionString, string backFile)
{
SqlConnectionStringBuilder connectionBuilder = new SqlConnectionStringBuilder(connectionString);
_serverName = connectionBuilder.DataSource;
_userId = connectionBuilder.UserID;
_userPassword = connectionBuilder.Password;
_databaseName = connectionBuilder.InitialCatalog;
_backFile = backFile;
}
/// <summary>
/// SqlServer备份还原
/// </summary>
/// <param name="serverName">服务器名或IP</param>
/// <param name="userId">数据库帐号</param>
/// <param name="userPassword">数据库密码</param>
/// <param name="databaseName">数据库名</param>
/// <param name="backFile">备份文件名</param>
public SqlServerBackupRestore(string serverName, string userId, string userPassword, string databaseName, string backFile)
{
_serverName = serverName;
_userId = userId;
_userPassword = userPassword;
_databaseName = databaseName;
_backFile = backFile;
}
/// <summary>
/// 服务器名或IP
/// </summary>
public string ServerName
{
get { return _serverName; }
set { _serverName = value; }
}
/// <summary>
/// 数据库用户名
/// </summary>
public string UserId
{
get { return _userId; }
set { _userId = value; }
}
/// <summary>
/// 数据库密码
/// </summary>
public string Password
{
get { return _userPassword; }
set { _userPassword = value; }
}
/// <summary>
/// 数据库名
/// </summary>
public string DataBaseName
{
get { return _databaseName; }
set { _databaseName = value; }
}
/// <summary>
/// 备份文件名
/// </summary>
public string BackupFile
{
get { return _backFile; }
set { _backFile = value; }
}
/// <summary>
/// 备份数据库
/// </summary>
/// <returns>成功，true，失败，false</returns>
public bool Backup()
{
bool result = true;
server = new SQLDMO.SQLServerClass();
backup = new SQLDMO.BackupClass();
try
{
server.LoginSecure = false;
server.Connect(ServerName, UserId, Password);
backup.Action = SQLDMO.SQLDMO_BACKUP_TYPE.SQLDMOBackup_Database;
backup.Database = DataBaseName;
backup.Files = BackupFile;
backup.BackupSetName = DataBaseName;
backup.BackupSetDescription = System.DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss");
backup.Initialize = true;
backup.SQLBackup(server);
}
catch (Exception ex)
{
result = false;
throw ex;
}
finally
{
server.DisConnect();
}
return result;
}
/// <summary>
/// 还原数据库
/// </summary>
/// <returns>成功，true，失败，false</returns>
public bool Restore()
{
bool result = false;
server = new SQLDMO.SQLServerClass();
try
{
server.LoginSecure = false;
server.Connect(ServerName, UserId, Password);
SQLDMO.QueryResults queryRestlts = server.EnumProcesses(-1);
int iColPIDNum = -1;
int iColDbName = -1;
for (int i = 1; i <= queryRestlts.Columns; i++)
{
string strName = queryRestlts.get_ColumnName(i);
if (strName.ToUpper().Trim() == "SPID")
{
iColPIDNum = i;
}
else if (strName.ToUpper().Trim() == "DBNAME")
{
iColDbName = i;
}
if (iColPIDNum != -1 && iColDbName != -1)
break;
}
for (int i = 1; i <= queryRestlts.Rows; i++)
{
int lPID = queryRestlts.GetColumnLong(i, iColPIDNum);
string strDBName = queryRestlts.GetColumnString(i, iColDbName);
if (strDBName.ToUpper() == DataBaseName.ToUpper())
server.KillProcess(lPID);
}
restore = new SQLDMO.RestoreClass();
restore.Action = SQLDMO.SQLDMO_RESTORE_TYPE.SQLDMORestore_Database;
restore.Database = DataBaseName;
restore.Files = BackupFile;
restore.FileNumber = 1;
restore.ReplaceDatabase = true;
restore.SQLRestore(server);
result = true;
}
catch (Exception ex)
{
throw ex;
}
finally
{
server.DisConnect();
}
return result;
}
#region IDisposable 成员
/// <summary>
/// 释放资源,在用完之后显示调用
/// </summary>
public void Dispose()
{
if (server != null)
{
server.DisConnect();
server = null;
}
if (backup != null)
{
backup = null;
}
if (restore != null)
{
restore = null;
}
GC.Collect();
GC.WaitForPendingFinalizers();
}
#endregion
}