标签：mysql windows-services c-2

我开发了一个Windows服务来从csv读取数据并将它们写回数据库.

执行程序后,它将正常工作,直到几分钟后到达下面的行时触发错误

cmd.ExecuteNonQuery();

错误的屏幕截图：

数据已写入数据库,直到弹出此错误.

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,我还将包含csv文件和数据库结构的屏幕截图.

在csv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数据库表的屏幕截图

 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.

解决方法:

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:

1. Press Win+R to open the “Run” dialog
2. Type gpedit.msc and press Enter
3. In the “Local Group Policy Editor”, expand “Computer Configuration”, expand “Administrative Templates”, expand “System”, expand “Internet Communication Management”, and then click “Internet Communication settings”.
4. 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 07002.

或者,您可以将MySQL ADO.NET库切换到MySqlConnector.它fixes many MySQL连接器/ NET错误,并且从未报告此特定问题.

标签：mysql,windows-services,c-2
来源： https://codeday.me/bug/20191001/1839644.html

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