關於ADO.NET參數化查詢的提問

時間 2019-12-11

標籤關於 ado.net ado 參數查詢提問简体版

原文原文鏈接

最近咱們的正式環境一直在報錯一個異常,首先我貼出來異常信息sql

BLL層捕獲到了請求的url數據庫

Net.BLL.MobileFun MobileFun.GetBusinessBidPolicy 異常數組

傳入參數爲：AucId=643129;CarId=680362;businessid:41773；async

異常信息爲:必須聲明標量變量 "@UID"。必須聲明標量變量 "@UID"。必須聲明標量變量 "@UID"。ide

URL:http://*********.com/httpHandler/ForMobileServiceHandler.ashx?action=getBidPolicy&aucId=643129&carId=680362&businessid=BC440DE0D6DCA7FD&version=v3.2.8&onlineid=021d162e-ba3e-45ac-8c59-8d265522d6ef&clienttype=0this

Dao層捕獲到的異常信息lua

Net.DAL.AuctionDao 位置:Net.DAL.AuctionDao,方法:GetBidPolicy,錯誤信息:System.Data.SqlClient.SqlException (0x80131904): 必須聲明標量變量 "@UID"。必須聲明標量變量 "@UID"。必須聲明標量變量 "@UID"。在 System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction) 在 System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose) 在 System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady) 在 System.Data.SqlClient.SqlDataReader.TryConsumeMetaData() 在 System.Data.SqlClient.SqlDataReader.get_MetaData() 在 System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString) 在 System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async, Int32 timeout, Task& task, Boolean asyncWrite, SqlDataReader ds) 在 System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, TaskCompletionSource`1 completion, Int32 timeout, Task& task, Boolean asyncWrite) 在 System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method) 在 System.Data.SqlClient.SqlCommand.ExecuteScalar() 在 Net.DBUtility.MySqlHelper.ExecuteScalar(SqlConnection connection, CommandType commandType, String commandText, SqlParameter[] commandParameters) 在 Net.DBUtility.MySqlHelper.ExecuteScalar(String connectionString, CommandType commandType, String commandText, SqlParameter[] commandParameters) 在 Net.DBUtility.MySqlDataProvider.GetSingle(String SQLString, IDataParameter[] cmdParms) 在 Net.DAL.AuctionDao.GetBidPolicy(String aucId) ClientConnectionId:48c2084f-c6b0-46b5-93b9-8a59ebcd29edurl

如今我貼出來我這幾個方法spa

BLL層.net

        public string GetBusinessBidPolicy(string AucId, string CarId, string businessid)
        {
            ConvertToJson ctj = new ConvertToJson();
            try
            {
                int tag = -1;
                int Offer = 0;
                int price = 0;
                int priceNonlocal = 0;
                objAuctionDao.GetBusinessBidInfo(AucId, CarId, ref tag, ref Offer, ref  price, ref  priceNonlocal, businessid);
                ctj.Append("ResId", "0");
                ctj.Append("ResMsg", "獲取商戶出價方案和報價成功！");
                ctj.Append("BidWay", tag);//0:本市；1 外遷；-1 還沒有選擇出價方式
                ctj.Append("price", price);
                ctj.Append("priceNonlocal", priceNonlocal);
                ctj.Append("MyOptimizationOffer", Offer);
            }
            catch (Exception e)
            {
                ctj.Append("ResId", "1");
                ctj.Append("ResMsg", "出現異常,獲取商戶出價方案和報價失敗！");
                m_objLog.Error("MobileFun.GetBusinessBidPolicy 異常    傳入參數爲：AucId=" + AucId + ";CarId=" + CarId + ";businessid:" + businessid + "；異常信息爲:" + e.Message+"URL:"+HttpContext.Current.Request.Url);
            }
            return ctj.ToObject();
        }

DAO層

   public void GetBusinessBidInfo(string aucId, string CarId, ref int tag, ref int Offer, ref int price, ref int priceNonlocal, string businessID = "")
        {
          
            try
            {
                string busID = "";
                if (string.IsNullOrEmpty(businessID))
                    busID = new MemberDto().BusinessId;
                else
                    busID = businessID;
                //-1 須要出價承諾，其餘不須要車價承諾
                int tag1 = GetBidPolicy(aucId);
                if (tag1 != 1 && tag1 != 2 && tag1 != 4 && tag1 != 3)
                {
                    tag = 0; return;
                }

                //            _strSql = string.Format(@"SELECT TOP 1 Tag FROM tbAuction_BidPolicyNow with(nolock) WHERE AucId = {0} AND BusinessId = {1} ORDER BY Created DESC
                //                                    SELECT Offer FROM tbSHD_OptimizationQuote with(nolock)  WHERE BusinessID={1} AND AucID={0}
                //                                    SELECT TOP 1 ISNULL(price,0) price,ISNULL(priceNonlocal,0) priceNonlocal FROM tbAuction_Evaluate with(nolock)  WHERE businessId={1} AND carid={2}  ORDER BY created desc
                //                                    ", aucId, busID, CarId);
                _strSql =
                        @"SELECT TOP 1 Tag FROM tbAuction_BidPolicyNow with(nolock) WHERE AucId = @AucID AND BusinessId = @UID ORDER BY Created DESC
                                    SELECT Offer FROM tbSHD_OptimizationQuote with(nolock)  WHERE BusinessID=@UID AND AucID=@AucID 
                                    SELECT TOP 1 ISNULL(price,0) price,ISNULL(priceNonlocal,0) priceNonlocal FROM tbAuction_Evaluate with(nolock)  WHERE businessId=@UID  AND carid=@CarID  ORDER BY created desc
                                    ";
                SqlParameter[] par = { new SqlParameter("@AucID", aucId), new SqlParameter("@UID", businessID), new SqlParameter("@CarID", CarId) };
                DataSet obj = _loacaldbRead.Query(_strSql, par);
                if (obj != null && obj.Tables.Count > 0)
                {
                    if (obj.Tables[0].Rows.Count > 0)
                    {
                        tag = int.Parse(obj.Tables[0].Rows[0][0].ToString());
                    }
                    else
                    {
                        tag = -1;
                    }
                    if (obj.Tables[1].Rows.Count > 0)
                    {
                        Offer = int.Parse(obj.Tables[1].Rows[0][0].ToString());
                    }
                    if (obj.Tables[2].Rows.Count > 0)
                    {
                        price = int.Parse(obj.Tables[2].Rows[0][0].ToString());
                        priceNonlocal = int.Parse(obj.Tables[2].Rows[0][1].ToString());
                    }
                }
            }
            catch (Exception e)
            {
                string error = string.Format("位置:{0},方法:{1},錯誤信息:{2}", this.GetType().ToString(),
                    System.Reflection.MethodBase.GetCurrentMethod().Name, e);
                _log.Error(error);
                throw;

            }

       public int GetBidPolicy(string aucId)
        {
        //    _strSql = string.Format("SELECT nonlocaltag FROM tbauction_baseinfo with(nolock) WHERE id = {0}", aucId);

        
            try
            {
                _strSql = "SELECT nonlocaltag FROM tbauction_baseinfo with(nolock) WHERE id = @AucID";
                SqlParameter[] par = { new SqlParameter("@AucID", aucId) };
                object obj = _loacaldbRead.GetSingle(_strSql, par);
                if (obj == null) return -1;
                return Convert.ToInt32(obj);
            }
            catch (Exception e)
            {
                string error = string.Format("位置:{0},方法:{1},錯誤信息:{2}", this.GetType().ToString(),
                    System.Reflection.MethodBase.GetCurrentMethod().Name, e);
                _log.Error(error);
                throw;

            }

        }

我一直很奇怪我用寫的參數化查詢語句而後值初始化在參數數組中丟給ADO.NET執行,爲何會說我沒有聲明@UID這個變量呢?

並且還有一個異常沒法找到表1

GetBidPolicy  這個方法中根本沒有用到@UID的參數可是報錯卻說
Net.DAL.AuctionDao 位置:Net.DAL.AuctionDao,方法:GetBidPolicy,錯誤信息:System.Data.SqlClient.SqlException (0x80131904): 必須聲明標量變量 "@UID"。 必須聲明標量變量 "@UID"。 必須聲明標量變量 "@UID"。

如今能夠肯定找不到表1 的這個異常是

                    if (obj.Tables[1].Rows.Count > 0)
                    {
                        Offer = int.Parse(obj.Tables[1].Rows[0][0].ToString());
                    }

這裏取 table[1].rows.count 的時候發現dataset中表1 null 因此拋出這個異常

那麼問題來了個人三個查詢一塊兒執行就算沒有查詢到數據 dataset 中也會有三張表即使是空表也不能沒有表

如今請教各位這個異常究竟是什麼緣由產生的呢?

URL 我本地,生產環境都試過了直接敲出來沒有報錯異常..

另請教參數化的sql語句 ado.net 去數據庫執行的時候是如何把值賦給參數的 ,求詳解!