C#对数据库的操作（查询，删除，更新）

版权声明：本文为博主原创文章，转载时请注明出处。 https://blog.csdn.net/nxw_tsp/article/details/85092257

查询：

static IQueryable<Outlet> Query(string Region, string DC, string CustomerCode, string KA, string OutletCode, string NestleOutletCode)
        {

            var query = (from o in DB.Current.Outlet
                         where
                       
                        (string.IsNullOrEmpty(Region) || o.Region.Contains(Region)) &&
                        (string.IsNullOrEmpty(DC) || o.DC.Contains(DC)) &&
                        (string.IsNullOrEmpty(CustomerCode) || o.CustomerCode.Contains(CustomerCode)) &&
                        (string.IsNullOrEmpty(KA) || o.KA.Contains(KA)) &&
                        (string.IsNullOrEmpty(OutletCode) || o.OutletCode.Contains(OutletCode)) &&
                        (string.IsNullOrEmpty(NestleOutletCode) || o.NestleOutletCode.Contains(NestleOutletCode))
                         select o);

            return query;
        }

删除

 public static bool DelAll(string Region, string DC, string CustomerCode, string KA, string OutletCode, string NestleOutletCode)
        {
            var outlet = Query(Region, DC, CustomerCode, KA, OutletCode,NestleOutletCode);
            var delsql = new StringBuilder();
            for (int i = 0; i < outlet.Count(); i++) {
                using (var db = new NestleImportEntities())
                {
                    delsql.Append($" DELETE FROM Outlet where 1=1 ");
                    if (Region != null && Region != "") {
                        delsql.Append("and Region like '%").Append(Region).Append($"%' ");
                    }
                    if (DC != null && DC != "") {
                        delsql.Append("and DC like '%").Append(DC).Append($"%' ");
                    }
                    if (CustomerCode != null && CustomerCode != "") {
                        delsql.Append("and CustomerCode like '%").Append(CustomerCode).Append($"%' ");
                    }
                    if (KA != null && KA != "") {
                        delsql.Append("and KA like '%").Append(KA).Append($"%' ");
                    }
                    if (OutletCode != null && OutletCode != "") {
                        delsql.Append("and OutletCode like '%").Append(OutletCode).Append($"%' ");
                    }
                    if (NestleOutletCode != null && NestleOutletCode != "") {
                        delsql.Append("and NestleOutletCode like '%").Append(NestleOutletCode).Append($"%' ");
                    }
                    
                    db.Database.ExecuteSqlCommand(delsql.ToString());
                }
            }
            return true;
        }

插入更新

private void UpdateOrInsertGroup(List<ExcelData> allList)
        {
            using (var db = new NestleImportEntities())
            {
                db.Database.CommandTimeout = 420;
                var wheresql = new StringBuilder();
                wheresql.Append($" 1 = 1 ");
                foreach (var f in UpdateWhereField)
                {
                    wheresql.Append($"and t.[{f}] = s.[{f}] ");
                }

                    try
                    {
                        var mergeSql = new StringBuilder();

                        mergeSql.Append($"MERGE INTO Product_Detail AS t USING (                   ");
                        mergeSql.Append($"	SELECT DISTINCT                                 ");
                        mergeSql.Append($"		YearMonth,  ");
                        mergeSql.Append($"		SKU_Code,  ");
                        mergeSql.Append($"		Unit_Quantity,  ");
                        mergeSql.Append($"		RRP_EA,  ");
                        mergeSql.Append($"		RRP_Cases,  ");
                        mergeSql.Append($"		SKU_Group,  ");
                        mergeSql.Append($"		Key_SKU,  ");
                        mergeSql.Append($"		insertUser,  ");
                        mergeSql.Append($"		CreateTime,  ");
                        mergeSql.Append($"		UpdateTime,  ");
                        mergeSql.Append($"		batchNo  ");
                        mergeSql.Append($"	FROM  ");
                        mergeSql.Append($"		Product_Detail_temp WHERE insertUser =   '").Append(loginedUser.User.ID).Append($"'");
                        mergeSql.Append($") AS s ON ").Append(wheresql);
                        mergeSql.Append($"WHEN matched THEN  ");
                        mergeSql.Append($"	UPDATE  ");
                        mergeSql.Append($"SET t.YearMonth = s.YearMonth,  ");
                        mergeSql.Append($"t.SKU_Code = s.SKU_Code,  ");
                        mergeSql.Append($"t.Unit_Quantity = t.Unit_Quantity,  ");
                        mergeSql.Append($"t.RRP_EA = t.RRP_EA,  ");
                        mergeSql.Append($"t.RRP_Cases = t.RRP_Cases,  ");
                        mergeSql.Append($"t.SKU_Group = s.SKU_Group,  ");
                        mergeSql.Append($"t.Key_SKU = s.Key_SKU,  ");
                        mergeSql.Append($"t.insertUser = s.insertUser,  ");
                        mergeSql.Append($"t.CreateTime = t.CreateTime,    ");
                        mergeSql.Append($"t.UpdateTime = s.UpdateTime  ");
                        mergeSql.Append($"WHEN NOT matched THEN  ");
                        mergeSql.Append($"	INSERT (  ");
                        mergeSql.Append($"		YearMonth,  ");
                        mergeSql.Append($"SKU_Code,  ");
                        mergeSql.Append($"Unit_Quantity,  ");
                        mergeSql.Append($"RRP_EA,  ");
                        mergeSql.Append($"RRP_Cases,  ");
                        mergeSql.Append($"SKU_Group,  ");
                        mergeSql.Append($"Key_SKU,  ");
                        mergeSql.Append($"insertUser,  ");
                        mergeSql.Append($"CreateTime,  ");
                        mergeSql.Append($"UpdateTime  ");
                        mergeSql.Append($"	)  ");
                        mergeSql.Append($"VALUES  ");
                        mergeSql.Append($"	(  ");
                        mergeSql.Append($"		s.YearMonth,  ");
                        mergeSql.Append($"		s.SKU_Code,  ");
                        mergeSql.Append($"		s.Unit_Quantity,  ");
                        mergeSql.Append($"		s.RRP_EA,  ");
                        mergeSql.Append($"		s.RRP_Cases,  ");
                        mergeSql.Append($"		s.SKU_Group,  ");
                        mergeSql.Append($"		s.Key_SKU,  ");
                        mergeSql.Append($"		s.insertUser,  ");
                        mergeSql.Append($"		s.CreateTime,  ");
                        mergeSql.Append($"		s.UpdateTime  ");
                        mergeSql.Append($"	) ;  ");
                        Logger.Current.Info("merg》》》》》：" + mergeSql.ToString());
                        db.Database.ExecuteSqlCommand(mergeSql.ToString());

                    }
                    catch (Exception ex)
                    {

                        Logger.Current.Info("上传失败！！！！！！！" + ex.Message);
                        throw new Exception("发送信息异常,原因:" + ex.Message + ex.InnerException);


                    }
                    finally
                    {
                        //释放资源
                        //scope.Dispose();
                    }
                

                ///////////////////////////////////////////////////////////////////////////

            }
        }