Hi, I am working on an application in which I need to read all records from a mySql table and process them one-by-one. Unfortunately I have some 850 records and it takes almost 20 minutes to process and print all the records. But after reading almost a 100 records from DB and printing them I get an exception with Error Message: "Fatal error encountered during data read." Here are the Exception Details: Code: MySql.Data.MySqlClient.MySqlException was unhandled Message="Fatal error encountered during data read." Source="MySql.Data" ErrorCode=-2147467259 Number=0 StackTrace: at MySql.Data.MySqlClient.MySqlDataReader.Read() at Askari9.mainForm.performBillPrinting() in C:\Users\adil\Documents\Visual Studio 2008\Projects\Askari9\Askari9\Form1.cs:line 645 at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) at System.Threading.ThreadHelper.ThreadStart() InnerException: MySql.Data.MySqlClient.MySqlException Message="Reading from the stream has failed." Source="MySql.Data" ErrorCode=-2147467259 Number=0 StackTrace: at MySql.Data.MySqlClient.MySqlStream.LoadPacket() at MySql.Data.MySqlClient.MySqlStream.ReadPacket() at MySql.Data.MySqlClient.NativeDriver.FetchDataRow(Int32 statementId, Int32 columns) at MySql.Data.MySqlClient.Driver.FetchDataRow(Int32 statementId, Int32 columns) at MySql.Data.MySqlClient.ResultSet.GetNextRow() at MySql.Data.MySqlClient.ResultSet.NextRow(CommandBehavior behavior) at MySql.Data.MySqlClient.MySqlDataReader.Read() InnerException: System.IO.IOException Message="Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host." Source="MySql.Data" StackTrace: at MyNetworkStream.HandleOrRethrowException(Exception e) at MyNetworkStream.Read(Byte[] buffer, Int32 offset, Int32 count) at MySql.Data.MySqlClient.TimedStream.Read(Byte[] buffer, Int32 offset, Int32 count) at System.IO.BufferedStream.Read(Byte[] array, Int32 offset, Int32 count) at MySql.Data.MySqlClient.MySqlStream.ReadFully(Stream stream, Byte[] buffer, Int32 offset, Int32 count) at MySql.Data.MySqlClient.MySqlStream.LoadPacket() InnerException: System.Net.Sockets.SocketException Message="An existing connection was forcibly closed by the remote host" Source="System" ErrorCode=10054 NativeErrorCode=10054 StackTrace: at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size) InnerException: and here is my code: Code: string MyConString = "SERVER=localhost;" + "DATABASE=askari9;" + "UID=root;" + "PASSWORD=;" + "Connect Timeout=21600;"; MySqlConnection connection = new MySqlConnection(MyConString); MySqlCommand command = connection.CreateCommand(); MySqlDataReader Reader; String strCommandText = "SELECT *"; strCommandText += " FROM homeowners"; command.CommandText = strCommandText; command.CommandTimeout = 21600; connection.Open(); // Opening DB connection Reader = command.ExecuteReader(); while (Reader.Read()) // Getting Exception on Reader.Read() after a few hundreds iterations { (range.Cells[12, 3] as Excel.Range).Value2 = Reader.GetValue(ownerNameAndRankFieldIndexInDB).ToString().Trim(); // Owner Name (range.Cells[13, 3] as Excel.Range).Value2 = Reader.GetValue(houseNoFieldIndexInDB).ToString().Trim(); // House Number (range.Cells[14, 3] as Excel.Range).Value2 = textBoxBillingMonth.Text; // Billing Month (range.Cells[15, 3] as Excel.Range).Value2 = textBoxDueDate.Text; // Due Date (range.Cells[18, 6] as Excel.Range).Value2 = textBoxServiceCharges.Text; // Service Charges ((Excel._Workbook)xlWorkBook).PrintOut(missing, missing, missing, missing, missing, missing, missing, missing); // Time taken by printer to process one document Thread.Sleep(2000); } connection.Close(); // closing DB connection I've tried increasing Connection and Command TimeOut but that didn't work either. Does anyone know any other way out ???
Between connection.Open(); and command.ExecuteNonQuery(); I just added two lines like this: Code: connection.Open(); MySqlCommand cmd = new MySqlCommand("set net_write_timeout=99999; set net_read_timeout=99999", connection); // Setting tiimeout on mysqlServer cmd.ExecuteNonQuery(); int numOfRecordsUpdated = command.ExecuteNonQuery(); Problem Fixed