MySqlClient EndOfStreamException：尝试读取流末尾时发生致命错误

Question

我开发了一个 windows 服务来从 csv 中读取数据并将它们写回数据库。

执行程序后它会正常工作，直到几分钟后到达下面的行时触发错误

cmd.ExecuteNonQuery();

错误截图：

在弹出这个错误之前，数据已经写入数据库了。

触发错误最多需要 2-3 分钟。

我将包含此问题的相关代码块。

   public void Insert()
        {
                if (this.OpenConnection() == true)
                {
                      using(var reader = new StreamReader(@"C:\Users\Admin\source\Bargstedt.csv"))
                    {
                        List<string> listA = new List<string>();

                        while (!reader.EndOfStream)
                        {
                            var line = reader.ReadLine();
                            var values = line.Split(',');
                            string querynew = "INSERT INTO new_jobs"
                                      + "(job_reference,status,code,no1,no2,no3,dimension,date_assigned,root,variable,number,stable,constant)" 
                                      + "VALUES (?jobNo, ?strClientName, ?strClientReference, ?strJobCategory, ?datCommisioned, ?datPromisedDelivery, ?division, ?date_assigned, ?root, ?variable, ?number, ?stable, ?constant)";

                                MySqlCommand cmd = connection.CreateCommand();
                        cmd.CommandText= querynew;
                                cmd.Parameters.Add("?jobNo", MySqlDbType.VarChar).Value = (values[0]);
                                cmd.Parameters.Add("?strClientName", MySqlDbType.VarChar).Value =(values[1]);
                                cmd.Parameters.Add("?strClientReference", MySqlDbType.VarChar).Value = values[2];
                                cmd.Parameters.Add("?strJobCategory", MySqlDbType.VarChar).Value = values[3];
                                cmd.Parameters.Add("?datCommisioned", MySqlDbType.VarChar).Value = values[4];
                                cmd.Parameters.Add("?datPromisedDelivery", MySqlDbType.VarChar).Value = values[5];
                                cmd.Parameters.Add("?division", MySqlDbType.VarChar).Value = values[7];
                        cmd.Parameters.Add("?date_assigned", MySqlDbType.VarChar).Value = values[9];
                        cmd.Parameters.Add("?root", MySqlDbType.VarChar).Value = values[10];
                        cmd.Parameters.Add("?variable", MySqlDbType.VarChar).Value = values[11];
                        cmd.Parameters.Add("?number", MySqlDbType.VarChar).Value = values[12];
                        cmd.Parameters.Add("?stable", MySqlDbType.VarChar).Value = values[13];
                        cmd.Parameters.Add("?constant", MySqlDbType.VarChar).Value = values[14];





                        cmd.ExecuteNonQuery(); **error line
                        }
                    }
                    this.CloseConnection();
                }



        }

为了更清楚起见，我将附上 csv 文件和数据库结构的屏幕截图。

csv 中的行中间有一些空格，这就是我在源代码中跳过第 6 行和第 8 行的原因。

phpMyAdmin 数据库的屏幕截图table

编辑：

MySql.Data.MySqlClient.MySqlException

  HResult=0x80004005
  Message=Fatal error encountered during command execution.
  Source=MySql.Data
  StackTrace:
   at MySql.Data.MySqlClient.MySqlCommand.ExecuteReader(CommandBehavior behavior)
   at MySql.Data.MySqlClient.MySqlCommand.ExecuteNonQuery()
   at SSHtest.DBConnect.Insert() in C:\Users\Admin\source\repos\backup new\SSHtest\SSHtest\Program.cs:line 248
   at SSHtest.Service1.timer1_Tick(Object sender, ElapsedEventArgs e) in C:\Users\Admin\source\repos\backup new\SSHtest\SSHtest\Service1.cs:line 87
   at System.Timers.Timer.MyTimerCallback(Object state)

Inner Exception 1:
MySqlException: Fatal error encountered attempting to read the resultset.

Inner Exception 2:
MySqlException: Reading from the stream has failed.

Inner Exception 3:
EndOfStreamException: Attempted to read past the end of the stream.

Answer 1

这是 MySQL Connector/NET 中的 very frequently reported 错误。

我见过社区发现的最佳解决方案是 posted by Rui Fan：

I've identified the root cause of one case of this exception. If you always see this exception at the first connection to the database, my solutions may apply to you. The 3 possible solutions:

Solution 1: If SSL is not required. Since it is caused by SSL, we can turn off SSL by appending "SslMode=None" to the connection string.

Solution 2: If SSL is required, server identity is important and needs to be verified. Connect the server to the internet and try again.

Solution 3: If SSL is required but the server identity is not important. Typically SSL is only used to encrypt the network transport in this case. We can turn off CTL update:

Press Win+R to open the "Run" dialog

Type gpedit.msc and press Enter

In the "Local Group Policy Editor", expand "Computer Configuration", expand "Administrative Templates", expand "System", expand "Internet Communication Management", and then click "Internet Communication settings".

In the details panel, double-click "Turn off Automatic Root Certificates Update", clickEnabled, then click OK. This change will be effective immediatelly without restart.

More details can be found in my blog.

或者，您可以将 MySQL ADO.NET 库切换为 MySqlConnector. It fixes many MySQL Connector/NET 错误，并且从未报告过此特定问题。

Answer 2

我遇到了同样的问题，none 上述解决方案对我有用。就我而言，我运行多于具有相同连接的 MySQL 插入命令。在我开始对多个命令使用事务后，问题解决了。

环境： IIS 10 上的 .NET Core 3.1 Web API。

Answer 3

就我而言，记录太多了。客户端的内存使用率过高，因此 GC 和 OS 虚拟内存管理器暂停线程的时间过长，导致服务器中止连接。 MySqlConnector 和 MySql.Data.

都发生了这种情况

改进我的客户端代码后，不再有异常。

MySqlClient EndOfStreamException：尝试读取流末尾时发生致命错误

MySqlClient EndOfStreamException: Fatal error when attempting to read past the end of the stream

c#

mysql

windows-services