查询花费比预期的odbc更长的时间

Question

I am doing a simple select with a date filter on it with a months range where only 32 records are present however its taking 15 seconds to query and return the data I am using sage 50 as you can probally tell and c#. I am using odbc to create the query the seem speeds can be found if i use the odbc query tool.

This is for a stright forward select and it should not be taking that long to return the data through odbc.

String SQL = string.Format("SELECT 'ORDER_NUMBER', 'ORDER_OR_QUOTE', 'ANALYSIS_1','ACCOUNT_REF','ORDER_DATE','NAME', 'COURIER_NUMBER','COURIER_NAME','CUST_TEL_NUMBER' ,'DESPATCH_DATE','ACCOUNT_REF', 'DEL_NAME', 'DEL_ADDRESS_1', 'DEL_ADDRESS_2', 'DEL_ADDRESS_3', 'DEL_ADDRESS_4', 'DEL_ADDRESS_5', 'INVOICE_NUMBER','ORDER_DATE','INVOICE_NUMBER_NUMERIC', 'CONTACT_NAME','CONSIGNMENT', 'NOTES_1', 'ITEMS_NET' ,'ITEMS_GROSS','QUOTE_STATUS' FROM SALES_ORDER WHERE ORDER_DATE

='{0}' and ORDER_DATE <='{1}'", fromD, toD);

public List<SalesOrders> GetSalesOrders()
{
        List<SalesOrders> _salesOrdersList = new List<SalesOrders>();

        try
        {


            string sageDsn = ConfigurationManager.AppSettings["SageDSN"];
            string sageUsername = ConfigurationManager.AppSettings["SageUsername"];
            string sagePassword = ConfigurationManager.AppSettings["SagePassword"];
            //int totalRecords = GetSalesOrdersount();
            int counter = 0;
             //using (var connection = new OdbcConnection("DSN=SageLine50v24;Uid=Manager;Pwd=;"))
            using (var connection = new OdbcConnection(String.Format("DSN={0};Uid={1};Pwd={2};", sageDsn, sageUsername, sagePassword)))
            {

                connection.Open();

                //string sql = string.Format(getInvoiceSql, customerCode, DateTime.Today.AddMonths(-1).ToString("yyyy-MM-dd"));
                string fromD = dtpFrom.Value.ToString("yyyy-MM-dd");
                string toD = dtpTo.Value.ToString("yyyy-MM-dd");

                String SQL = string.Format("SELECT 'ORDER_NUMBER', 'ORDER_OR_QUOTE', 'ANALYSIS_1','ACCOUNT_REF','ORDER_DATE','NAME', 'COURIER_NUMBER','COURIER_NAME','CUST_TEL_NUMBER' ,'DESPATCH_DATE','ACCOUNT_REF',  'DEL_NAME', 'DEL_ADDRESS_1', 'DEL_ADDRESS_2', 'DEL_ADDRESS_3', 'DEL_ADDRESS_4', 'DEL_ADDRESS_5',  'INVOICE_NUMBER','ORDER_DATE','INVOICE_NUMBER_NUMERIC', 'CONTACT_NAME','CONSIGNMENT', 'NOTES_1', 'ITEMS_NET' ,'ITEMS_GROSS','QUOTE_STATUS' FROM SALES_ORDER WHERE ORDER_DATE >='{0}' and ORDER_DATE <='{1}'", fromD, toD);
                using (var command = new OdbcCommand(SQL, connection))
                {


                    using (var reader = command.ExecuteReader())

                    {

                        while (reader.Read())
                        {
                            counter++;

                            backgroundWorker1.ReportProgress(counter);

                            var salesOrders = new SalesOrders();
                            salesOrders.ACCOUNT_REF = Convert.ToString(reader["ACCOUNT_REF"]);
                            salesOrders.RecordIdentifier = "";
                            salesOrders.ShipmmentId = Convert.ToString(reader["ORDER_NUMBER"]);
                            salesOrders.OrderDate = Convert.ToDateTime(reader["ORDER_DATE"]);
                            salesOrders.OrderNumber = Convert.ToString(reader["ORDER_NUMBER"]);

                            salesOrders.Company = "";
                            salesOrders.Carrier = Convert.ToString(reader["COURIER_NUMBER"]);
                            salesOrders.CarrierService = Convert.ToString(reader["COURIER_NAME"]);
                            salesOrders.CustomerName = Convert.ToString(reader["NAME"]);
                            salesOrders.ShipToAddress1 = Convert.ToString(reader["DEL_ADDRESS_1"]);
                            salesOrders.ShipToAddress2 = Convert.ToString(reader["DEL_ADDRESS_2"]);
                            salesOrders.ShipToAddress3 = Convert.ToString(reader["DEL_ADDRESS_3"]);
                            salesOrders.ShipToAddress4 = Convert.ToString(reader["DEL_ADDRESS_4"]);
                            salesOrders.ShipToAddress5 = Convert.ToString(reader["DEL_ADDRESS_5"]);
                            salesOrders.ShiptoAttention = Convert.ToString(reader["DEL_NAME"]);
                            salesOrders.ShiptoPhoneNo = Convert.ToString(reader["CUST_TEL_NUMBER"]);
                            salesOrders.Country = Convert.ToString(reader["ANALYSIS_1"]);
                            salesOrders.ShiptoEmail = "";
                            salesOrders.MakeAddressDefault = "Y";
                            bool isProcessed = _sqlManager.hasbeenProcessed(salesOrders.OrderNumber);
                            if (isProcessed == true)
                                salesOrders.Exported = true;
                            _salesOrdersList.Add(salesOrders);


                        }
                    }
                }

            }

        return _salesOrdersList.OrderByDescending(o => o.OrderDate).ToList();
    }

Answer 1

don't use {0}, {1} for embedding values in strings... ADD via Parameters

               String SQL = 
@"SELECT 
      ORDER_NUMBER, 
      ORDER_OR_QUOTE, 
      ANALYSIS_1,
      ACCOUNT_REF,
      ORDER_DATE,
      `NAME`, 
      COURIER_NUMBER,'
      OURIER_NAME,
      CUST_TEL_NUMBER,
      DESPATCH_DATE,
      ACCOUNT_REF,  
      DEL_NAME, 
      DEL_ADDRESS_1,
      DEL_ADDRESS_2,
      DEL_ADDRESS_3,
      DEL_ADDRESS_4,
      DEL_ADDRESS_5,
      INVOICE_NUMBER,
      ORDER_DATE,
      INVOICE_NUMBER_NUMERIC,
      CONTACT_NAME,
      CONSIGNMENT,
      NOTES_1,
      ITEMS_NET,
      ITEMS_GROSS,
      QUOTE_STATUS
   FROM 
      SALES_ORDER 
   WHERE 
          ORDER_DATE >= ?
      and ORDER_DATE <= ?
   ORDER BY
      ORDER_DATE DESC";

                using (var command = new OdbcCommand(SQL, connection))
                {
                   // assuming fields are actually date data types fields
                   command.Parameters.Add( "parmFromDate", fromD );
                   command.Parameters.Add( "parmToDate", toD );

The "?" in the query are place-holders for the parameter values which are handled by the ODBC process. The Parameters being added within the using() portion are added in the same ordinal position as their respective place-holder parts. I just assigned the parameter name to give context to whoever is looking at it after.

The query itself SHOULD be very quick depending on the date range you are pulling. Even added the SQL Order by descending order so it is pre-pulled down in the order you intended it too.