以編程方式恢復多個數據庫

Question

我正在執行從/向Microsoft SQL Server恢復/備份數據庫的應用程序。

如何獲取捕獲源文件夾中所有.bak文件的效果，而目標數據庫的文本框用作新數據庫的新名稱並將其還原到sql服務器中？

我的驗證是，如果目標數據庫groupbox中的名稱，它會提示錯誤而不是恢復它。

這是接口

這裏是我的代碼

CheckDBExist

public List<string> CheckIfDatabaseExists(string SQLServer, string backupRestore) 
{ 
    bool result = false; 
    List<string> DBList = new List<string>(); 
    string sqlConnectionString = this.rbWindow.Checked ? 
       "Server=" + this.cboSQLServer.Text.Trim() + ";Database=master;Trusted_Connection=Yes" : 
       "Server=" + this.cboSQLServer.Text.Trim() + ";Database=master;uid=" + this.txtUsername.Text.Trim() + ";pwd=" + this.txtPassword.Text.Trim(); 
    foreach (Control c in groupBox1.Controls) 
    { 
     if (c.GetType() == typeof(TextBox)) 
     { 
      SqlConnection tmpConn = new SqlConnection(sqlConnectionString); 

      string sqlCreateDBQuery = string.Format("SELECT database_id FROM sys.databases WHERE Name = '{0}'", c.Text); 

      using (tmpConn) 
      { 
       using (SqlCommand sqlCmd = new SqlCommand(sqlCreateDBQuery, tmpConn)) 
       { 
        tmpConn.Open(); 

        object resultObj = sqlCmd.ExecuteScalar(); 

        int databaseID = 0; 

        if (resultObj != null) 
        { 
         int.TryParse(resultObj.ToString(), out databaseID); 
        } 

        tmpConn.Close(); 

        result = (databaseID > 0); 
        if ((!result) && (backupRestore == "backup")) 
        { 
         DBList.Add("[" + c.Text + "]"); 
        } 
        else if ((result) && (backupRestore == "restore")) 
        { 
         DBList.Add("[" + c.Text + "]"); 
        } 

       } 
      } 
     } 
    } 
    return DBList; 
} 

按鈕單擊

private void btnRestore_Click(object sender, EventArgs e) 
{ 
    string outputFolder = this.txtFolder.Text; 
    if (string.IsNullOrEmpty(outputFolder)) 
    { 
     MessageBox.Show("Please select source folder!", "Empty Source Folder", MessageBoxButtons.OK, MessageBoxIcon.Error); 
    } 
    else 
    { 
     List<string> ExistDB = new List<string>(); 
     ExistDB = this.CheckIfDatabaseExists(this.cboSQLServer.Text, "restore"); 
     if (ExistDB.Count == 0) 
     { 
      RestoreDatabase(this.cboSQLServer.Text, this.txtFolder.Text); 
     } 
     else 
     { 
      MessageBox.Show("Databases " + string.Join(", ", ExistDB) + " exist!", "Database Error", MessageBoxButtons.OK, MessageBoxIcon.Error); 
     } 
    } 
} 

恢復DB代碼

公共無效RestoreDatabase（字符串SQLSERVER，串outputFolder） {

 ServerConnection con = new ServerConnection(SQLServer); 
     Server server = new Server(con);    

      foreach (Control c in groupBox3.Controls) 
      { 

       //try 
       //{ 
        if (c.GetType() == typeof(TextBox)) 
        { 
         Restore destination = new Restore(); 
         destination.Action = RestoreActionType.Database; 
         destination.Database = c.Text; 
         string backUpFile = outputFolder + "\\" + destination.Database + ".bak"; 
         BackupDeviceItem source = new BackupDeviceItem(backUpFile, DeviceType.File); 

         string logFile = Path.GetDirectoryName(backUpFile); 
         logFile = Path.Combine(logFile, destination.Database + "_Log.ldf"); 

         string dataFile = Path.GetDirectoryName(backUpFile); 
         dataFile = Path.Combine(dataFile, destination.Database + ".mdf"); 


         destination.Devices.Add(source); 
         DataTable logicalRestoreFiles = destination.ReadFileList(server); 
         destination.RelocateFiles.Add(new RelocateFile(logicalRestoreFiles.Rows[0][0].ToString(), dataFile)); 
         destination.RelocateFiles.Add(new RelocateFile(logicalRestoreFiles.Rows[1][0].ToString(), logFile)); 
         destination.ReplaceDatabase = true; 
         destination.SqlRestore(server); 
        }    
       //} 
       //catch (Exception ex) 
       //{ 
       //MessageBox.Show(ex.Message); 
       //}                
      }  
      }     

這是引發異常的代碼

錯誤說：

「無法打開備份設備'D：\ TestBackup \ VSM642SP2QC__VfsWorkflow.bak'。 ？>操作系統錯誤2（系統無法找到文件>指定）。\ r \ nRESTORE FILELIST正在異常終止。」

我應該怎麼辦？

Answer 1

加入這行代碼，立即在您使用ReadFileList

destination.Devices.Add(source); 

還原調用ReadFileList方法之前實例必須聲明DeviceType前行。否則，會拋出異常。你被宣告DeviceType，但從來沒有迷上它給你的Restore。