Question

我们一直在使用带有.net连接器的C＃和mysql，但是使用单独的提交，有时它无法全部提交。所以我们现在转向这个支持分布式事务的工具http://www.devart.com/dotconnect/mysql/。一切正常，只是我们不太确定如何进行多重连接。方法1将每个连接嵌套到另一个中。方法2是分开的。我们应该关闭连接或由transScope.Complete（）处理;和transScope.Dispose（）;

方法1。

using (TransactionScope transScope = new TransactionScope())
{
     string myConnStringLocal = "User Id=***;Password=****;Host=" + globalSettings.settingLocalIP + ";Database=" + globalSettings.settingLocalDB;
     using (MySqlConnection connectionLocal = new MySqlConnection(myConnStringLocal))
     {
       connectionLocal.open() 

       string myConnStringCentral = "User Id=***;Password=*****;Host=" + globalSettings.settingCentralIP + ";Database=" + globalSettings.settingCentralDB;
         using (MySqlConnection connectionCentral = new MySqlConnection(myConnStringCentral))
         {
             connectionCentral.Open();
               string myConnStringCentralCopy = "User Id=*****;Password=*****;Host=" + globalSettings.settingCentralCopyIP + ";Database=" + globalSettings.settingCentralCopyDB;
              using (MySqlConnection connectionCentralCopy = new MySqlConnection(myConnStringCentralCopy))
             {
                 connectionCentralCopy.Open();   
             }
         }
     }

     if (rollbackBoolean == 0)
        transScope.Complete();
     else
        transScope.Dispose();
}

方法2

using (TransactionScope transScope = new TransactionScope())
{
     string myConnStringLocal = "User Id=***;Password=****;Host=" + globalSettings.settingLocalIP + ";Database=" + globalSettings.settingLocalDB;
     using (MySqlConnection connectionLocal = new MySqlConnection(myConnStringLocal))
     {
         connectionLocal.open() 
     }

     string myConnStringCentral = "User Id=***;Password=*****;Host=" + globalSettings.settingCentralIP + ";Database=" + globalSettings.settingCentralDB;
    using (MySqlConnection connectionCentral = new MySqlConnection(myConnStringCentral))
    {
       connectionCentral.Open();
    }

    string myConnStringCentralCopy = "User Id=*****;Password=*****;Host=" + globalSettings.settingCentralCopyIP + ";Database=" + globalSettings.settingCentralCopyDB;
    using (MySqlConnection connectionCentralCopy = new MySqlConnection(myConnStringCentralCopy))
    {
        connectionCentralCopy.Open();   
    }

    if (rollbackBoolean == 0)
        transScope.Complete();
    else
        transScope.Dispose();
}

Answer 1

两种方法都是正确的。在两种情况下，TransactionScope将与dotConnect for MySQL一起使用。以下代码不是必需的：

else
transScope.Dispose();

因为退出using (TransactionScope transScope = new TransactionScope())块时会自动调用Dispose方法。

...我完成了它意味着在我的情况下，当我打电话给完整的仪式时，transactionScope将关闭它...

不，transScope.Complete（）不会关闭连接。如果在TransactionScope的使用块内关闭连接，则连接对象将被关闭，但是如果在transScope.Complete（）之前调用transScope.Dispose（），则内部连接将保持打开状态以便向数据库发送更改。呼叫。如果为连接对象调用了Close或Dispose方法，则transScope.Dispose（）将关闭内部连接。如果连接对象未关闭，则transScope.Dispose（）不对连接执行任何操作。

...我的每个连接中的另一件事我跟踪try和catch，如果有任何错误我将rollbackBoolean标记为1，那么它就不会完成并且整个事务应该回滚是正确的机制？ ......

如果发生错误，请不要调用完成。如果未调用Complete方法，则在执行Dispose方法时将回滚事务。

以下是带有try / catch块的示例，并在出现错误时回滚事务：

using (TransactionScope transScope = new TransactionScope())
{
   try
   {
      string myConnStringLocal = "User Id=***;Password=****;Host=" + globalSettings.settingLocalIP + ";Database=" + globalSettings.settingLocalDB;
      using (MySqlConnection connectionLocal = new MySqlConnection(myConnStringLocal))
      {
         connectionLocal.Open();
      }

      string myConnStringCentral = "User Id=***;Password=*****;Host=" + globalSettings.settingCentralIP + ";Database=" + globalSettings.settingCentralDB;
      using (MySqlConnection connectionCentral = new MySqlConnection(myConnStringCentral))
      {
         connectionCentral.Open();
      }
      string myConnStringCentralCopy = "User Id=*****;Password=*****;Host=" + globalSettings.settingCentralCopyIP + ";Database=" + globalSettings.settingCentralCopyDB;
      using (MySqlConnection connectionCentralCopy = new MySqlConnection(myConnStringCentralCopy))
      {
         connectionCentralCopy.Open();
      }
      transScope.Complete();
      Console.WriteLine("Transaction is completed");
   }
   catch (Exception)
   {
      Console.WriteLine("Transaction is rolled back");
   }
}

使用Devart Connectory Mysql的事务范围的正确方法

1 个答案: