Question

我有一个用C＃编写的服务，该服务在域管理员帐户下运行。此帐户在该域中的所有SQL Server上设置为SQL admin。该服务需要将mdf / ldf（SQL Server 2003或2008）从一个服务器复制到另一个服务器并将其附加到新服务器。我没有在源服务器上分离DB，而是将DB状态更改为只读，然后复制mdf / ldf文件。复制完毕后，我将DB状态重置为读写。

如果源服务器名称类似于MYSQLSERVER2K8，则此方法有效。但是，如果代码是实例名称，则代码不起作用。例如：MYSQLSERVER2K8 \ VAULT。我已经在我的代码中运行NUnit中的单元测试，并且单元测试都通过了两种情况。但是，该服务无法更改数据库状态。我们得到的错误如下：

SQL：ALTER DATABASE My_Test_DataBase SET SINGLE_USER WITH ROLLBACK IMMEDIATE ---＆gt; System.Data.SqlClient.SqlException：数据库'My_Test_DataBase'不存在。检查sysdatabases。 ALTER DATABASE语句失败。在System.Data.SqlClient.SqlConnection。

这是我的代码（注意我将服务器名称转换为连接字符串中的IP地址。例如：MYSQLSERVER2K8 \ VAULT转换为111.111.111.111 \ VAULT：

#region ChangeDatabaseStatus
    /// <summary>
    /// Change the database status to read-only/read-write
    /// </summary>
    /// <param name="serverName"></param>
    /// <param name="databaseName"></param>
    /// <param name="status"></param>
    public virtual bool ChangeDatabaseStatus(string serverName, string databaseName, string status)
    {
        DateTime beginTimeStamp = DateTime.Now;
        string sql = String.Empty;
        bool databaseStatusChanged = false;

        try
        {
            SqlConnection connection = GetSqlConnection(false);

            string connectionString = connection.ConnectionString;
            string serverIPAddress = Dns.GetHostAddresses(serverName.Contains(@"\") ? serverName.Substring(0, serverName.IndexOf(@"\")) : serverName)[0].ToString();
            connectionString = connectionString.Replace("{0}", serverIPAddress = serverName.Contains(@"\") ? serverIPAddress + serverName.Substring(serverName.IndexOf(@"\"), serverName.Length - serverName.IndexOf(@"\")) : serverIPAddress);

            connection.Close();
            connection = new SqlConnection(connectionString);                

            using (SqlCommand command = new SqlCommand())
            {
                command.Connection = connection;
                command.CommandTimeout = _commandTimeout;
                command.CommandType = CommandType.Text;

                command.CommandText = String.Format("ALTER DATABASE {0} SET SINGLE_USER WITH ROLLBACK IMMEDIATE", databaseName);

                //Debugging & Exception handling
                sql = HelperFunctions.BuildSQL(command);

                connection.Open();

                command.ExecuteNonQuery();

                connection.Close();
            }

            using (SqlCommand command = new SqlCommand())
            {
                command.Connection = connection;
                command.CommandTimeout = _commandTimeout;
                command.CommandType = CommandType.Text;

                command.CommandText = status == "ReadOnly" ? String.Format("ALTER DATABASE {0} SET READ_ONLY", databaseName) : String.Format("ALTER DATABASE {0} SET READ_WRITE", databaseName);

                //Debugging & Exception handling
                sql = HelperFunctions.BuildSQL(command);

                connection.Open();

                command.ExecuteNonQuery();

                connection.Close();

                databaseStatusChanged = true;
            }

            using (SqlCommand command = new SqlCommand())
            {
                command.Connection = connection;
                command.CommandTimeout = _commandTimeout;
                command.CommandType = CommandType.Text;

                command.CommandText = String.Format("ALTER DATABASE {0} SET MULTI_USER", databaseName);

                //Debugging & Exception handling
                sql = HelperFunctions.BuildSQL(command);

                connection.Open();

                command.ExecuteNonQuery();

                connection.Close();
            }

        }
        catch (Exception e)
        {
            throw new DataProviderException(String.Format("{0} operation failed. SQL: {1}", MethodBase.GetCurrentMethod().Name, sql), e);
        }
        finally
        {

            LogPerformance(String.Format("Elapsed time for: {0}", MethodBase.GetCurrentMethod().Name), beginTimeStamp, DateTime.Now, null);
        }

        return databaseStatusChanged;
    }
    #endregion //ChangeDatabaseStatus

Answer 1

检查您是否配置了别名。

在Native Client下加载Sql Server配置管理器，然后加载别名。

正如Tony Hopkinson所说，测试你可以使用sqlcmd或来自同一台机器的东西进行连接：

sqlcmd -S MYSQLSERVER2K8\VAULT -q "ALTER DATABASE dbname SET SINGLE_USER WITH ROLLBACK IMMEDIATE"

连接字符串具有实例名称时的ALTER DB错误 - C＃4.0

1 个答案: