Unknow reason for multiple Mysql Entries

I have a service which retrieve historical data and saves it in MySQL table

    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
    {
        while (!stoppingToken.IsCancellationRequested)
        {
            _logger.LogInformation("Worker running at: {time}", DateTimeOffset.Now);

            //Get Relevant Gateways
            string GetRouters = "SELECT * FROM RouterModel;";
            var Routers = await dataAccess.LoadData<RouterModel, dynamic>(GetRouters, new { }, _config.GetConnectionString("MainDB"));

            string GetMeters = "SELECT * FROM PowerMeterModel;";
            var Meters = await dataAccess.LoadData<PowerMeterModel, dynamic>(GetMeters, new { }, _config.GetConnectionString("MainDB"));


            foreach (RouterModel Router in Routers)
            {
                if (Router.IsHavePowerMeters)
                {
                    foreach (PowerMeterModel Meter in Meters.Where(x => x.IdGateway == Router.Id).ToList())
                    {
                        if (Meter.IsActive)
                        {
                            actionList.Add(new Action(() =>
                            {
                                GetHistory(Router, Meter);
                                _logger.LogInformation("Synced History meter:" + Meter.SerialNumber.ToString());

                                
                            }));

                            
                        }
                    }
                }

            }

            Parallel.Invoke(actionList.ToArray());
            actionList.Clear();

            _logger.LogWarning("*************** Sync loop is finished ***************");

            await Task.Delay(60*1000, stoppingToken);
        }
    }


    
    public async void GetHistory(RouterModel Router, PowerMeterModel Meter)
    {
        Web device = new() { IpAddress = Router.IpAddress, UserName = Meter.Username, Password = Meter.Password, Port = Meter.TcpPort };
        StringBuilder SqlQuery = new();
        StringBuilder TimeString = new();
        ElnetMcMapping elnetMcMapping = new();
        ElnetMcModel mcReadings = new();

        if (Meter.ModelClass == nameof(ElnetMcModel).ToString())
        {
            for (int day = 1; day < 4; day++)
            {
                List<List<double>> responeData = new();
                DateTime date = todayDate.AddDays(-day);

                for (int j = 0; j < elnetMcMapping.DataItems.Count; j += 8)
                {
                    var items = elnetMcMapping.DataItems.Skip(j).Take(8);
                    device.Items = items.Select(x => x.Address.ToString()).ToList();

                    var responseString = device.GetElnetReadings(httpClient, 2, date);
                    if (responseString != null)
                    {
                        int check = responeData.Count;
                        responeData.AddRange(JsonConvert.DeserializeObject<List<List<double>>>(responseString));

                    }
                    else { return; }
                }

                for (int j = 0; j < elnetMcMapping.DataItems.Count; j++) { elnetMcMapping.DataItems[j].Value = responeData[j]; }

                foreach (MetaData metaData in elnetMcMapping.DataItems)
                {
                    Type type = mcReadings.GetType();
                    PropertyInfo prop = type.GetProperty(metaData.Label);

                    if (prop.PropertyType == typeof(decimal)) { prop.SetValue(mcReadings, Convert.ToDecimal(metaData.Value[0]) * metaData.Multiplier, null); }
                    else if (prop.PropertyType == typeof(string)) { prop.SetValue(mcReadings, metaData.Value[0].ToString(), null); }
                    else if (prop.PropertyType == typeof(int)) { prop.SetValue(mcReadings, int.Parse(metaData.Value[0].ToString()), null); }
                    else if (prop.PropertyType == typeof(DateTime)) { prop.SetValue(mcReadings, DateTime.Now, null); }
                    else { return; }
                }


                var propList = mcReadings.GetType().GetProperties().ToList();
                SqlQuery.Append("INSERT INTO " + Meter.DataTableName + " (");
                foreach (PropertyInfo prop in propList) { SqlQuery.Append(prop.Name + ","); }
                SqlQuery.Remove(SqlQuery.Length - 1, 1);
                SqlQuery.Append(") VALUES (");
                foreach (PropertyInfo prop in propList)
                {
                    if (prop.PropertyType == typeof(DateTime))
                    {
                        DateTime dateTime = (DateTime)prop.GetValue(mcReadings);
                        SqlQuery.Append("'" + dateTime.ToString("yyyy-MM-dd HH:mm:ss") + "'" + ",");
                    }
                    else { SqlQuery.Append(prop.GetValue(mcReadings).ToString() + ","); }
                }
                SqlQuery.Remove(SqlQuery.Length - 1, 1);
                SqlQuery.Append(");");

                await dataAccess.SaveData(SqlQuery.ToString(), mcReadings, _config.GetConnectionString("PwrMeterDb"));

            }
        }
    }

}

}

The above code should add only 4 MySql rows, instead I get 6, it seems like the whole method
is starting all over again for each time the loop for (int day = 1; day < 4; day++)
cahnges its value.

Instead getting 4 rows (one for each day) I get 6

Instead getting 5 rows (one for each day) I get 10

Instead getting 6 rows (one for each day) I get 15

Instead getting 7 rows (one for each day) I get 21

Any ideas what could be wrong ?

Answers:

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Method 1

You’re not clearing the SqlQuery StringBuilder object at the beginning of each loop.

So, in the first iteration, it has one INSERT query. In the second iteration, it has two, for a total of three INSERTs. In the third iteration, it has three, for a total of six. In the fourth iteration, it has four INSERTs, for a total of ten. This produces the 1, 3, 6, 10, 15, 21 sequence you’re observing.

Call SqlQuery.Clear() at the beginning of each loop.

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