Question

这是一个奇怪的问题。我们有一个程序可以在Microsoft SQL Server 2012中使用C＃安装2个数据库。

卸载程序后，数据库不会被删除。当用户重新安装程序时，它会检查数据库是否仍在服务器内，然后删除它们，然后重新创建已删除的数据库。

数据库.bak文件在C:/Program Files或同等文件夹中创建。现在的问题是，如果你在卸载后手动删除.bak文件并尝试重新安装程序，它就会失败（显然）。

但是如果你尝试三次安装程序，它最终会设法创建2个数据库。

这里是C＃代码

String path = System.Reflection.Assembly.GetExecutingAssembly().Location;
path = System.IO.Path.GetDirectoryName(path);

Server server = InitializeServer(log);
server.ConnectionContext.Connect();

Database db = server.Databases["ADB"];  

if (db != null) 
{
    try
    {
        db.Drop();//-------------------------First try fails here
    }
    catch (Exception ex)
    {
        throw new ApplicationException(ex.Message);
    }
}

try  //----------------- second try database ADB gets created
{
    Restore restore = new Restore();

    // Set type of backup to be performed to database
    restore.Database = "ADB";
    restore.Action = RestoreActionType.Database;
    restore.ReplaceDatabase = true;

    // Create the Restore database ldf & mdf file name
    String dataFileLocation = path + "ADB" + ".mdf";
    String logFileLocation = path + "ADB" + "_Log.ldf";
    RelocateFile rf = new RelocateFile("ADB", dataFileLocation);

    // Set up the backup device to use filesystem. 
    restore.Devices.AddDevice(path + "\\ADB.bak", DeviceType.File);

    System.Data.DataTable logicalRestoreFiles = restore.ReadFileList(server);
    restore.RelocateFiles.Add(new RelocateFile(logicalRestoreFiles.Rows[0][0].ToString(), dataFileLocation));
    restore.RelocateFiles.Add(new RelocateFile(logicalRestoreFiles.Rows[1][0].ToString(), logFileLocation));
    restore.NoRecovery = false;

    restore.SqlRestore(server);
}
catch (Exception ex)
{
    throw new ApplicationException(ex.Message);
}

// Installing 2nd database----------------------------------------------
server.ConnectionContext.Connect();

Database db1 = server.Databases["BDB"]; 

if (db1 != null)
{
    try
    {
        db1.Drop();//-------------------------Second try fails here
    }
    catch (Exception ex)
    {
        throw new ApplicationException(ex.Message);
    }
}

try //----------------- Third try database BDB gets created
{
    Restore restore2 = new Restore();
    restore2.Database = "BDB";
    restore2.Action = RestoreActionType.Database;
    restore2.ReplaceDatabase = true;

    String dataFileLocation = path + "BDB" + ".mdf";
    String logFileLocation = path + "BDB" + "_Log.ldf";

    RelocateFile rf = new RelocateFile("BDB", dataFileLocation);

    restore2.Devices.AddDevice(path + "\\BDB.bak", DeviceType.File);

    System.Data.DataTable logicalRestoreFiles = restore2.ReadFileList(server);
    restore2.RelocateFiles.Add(new RelocateFile(logicalRestoreFiles.Rows[0][0].ToString(), dataFileLocation));
    restore2.RelocateFiles.Add(new RelocateFile(logicalRestoreFiles.Rows[1][0].ToString(), logFileLocation));
    restore2.NoRecovery = false;

    restore2.SqlRestore(server);
}

我的问题是，有没有办法在手动删除.bak文件后分离服务器数据库？为什么数据库是在第二次尝试时创建的？

编辑：这是删除数据库时收到的错误消息

Microsoft.SqlServer.Management.Smo.FailedOperationException: Drop failed for Database 'ADB'.  ---> Microsoft.SqlServer.Management.Common.ExecutionFailureException: An exception occurred while executing a Transact-SQL statement or batch. ---> System.Data.SqlClient.SqlException: Cannot drop the database 'ADB', because it does not exist or you do not have permission.
   at Microsoft.SqlServer.Management.Common.ConnectionManager.ExecuteTSql(ExecuteTSqlAction action, Object execObject, DataSet fillDataSet, Boolean catchException)
   at Microsoft.SqlServer.Management.Common.ServerConnection.ExecuteNonQuery(String sqlCommand, ExecutionTypes executionType)
   --- End of inner exception stack trace ---
   at Microsoft.SqlServer.Management.Common.ServerConnection.ExecuteNonQuery(String sqlCommand, ExecutionTypes executionType)
   at Microsoft.SqlServer.Management.Common.ServerConnection.ExecuteNonQuery(StringCollection sqlCommands, ExecutionTypes executionType)
   at Microsoft.SqlServer.Management.Smo.ExecutionManager.ExecuteNonQuery(StringCollection queries)
   at Microsoft.SqlServer.Management.Smo.SqlSmoObject.ExecuteNonQuery(StringCollection queries, Boolean includeDbContext)
   at Microsoft.SqlServer.Management.Smo.SqlSmoObject.DropImplWorker(Urn& urn)
   at Microsoft.SqlServer.Management.Smo.SqlSmoObject.DropImpl()
   --- End of inner exception stack trace ---
   at Microsoft.SqlServer.Management.Smo.SqlSmoObject.DropImpl()
   at SetupScripts.SetupDataBase.Execute(FrmLog log)

手动删除.bak文件

0 个答案: