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我正在做一个简单的选择，上面有一个日期过滤器，它的月份范围只有 32 条记录，但是它需要 15 秒来查询和返回我正在使用 sage 50 的数据，因为你可能知道和 c#。我正在使用 odbc 创建查询，如果我使用 odbc 查询工具，可以找到似乎速度。

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这是一个简单的选择，通过 odbc 返回数据不应该花费那么长时间。

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' 来自 SALES_ORDER WHERE ORDER_DATE

='{0}' 和 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();
    }
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1 回答 1

1

不要使用 {0}、{1} 在字符串中嵌入值...通过参数添加

               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 );

这 ”？” 在查询中是由 ODBC 进程处理的参数值的占位符。在 using() 部分中添加的参数被添加到与它们各自的占位符部分相同的序号位置。我刚刚分配了参数名称，以便为正在查看它的人提供上下文。

查询本身应该非常快，具体取决于您要提取的日期范围。甚至按降序添加了 SQL 顺序，因此它也按照您想要的顺序预先下拉。

于 2018-09-11T17:24:56.730 回答