/// <summary>
/// Update rating of the location asynchronously.
/// </summary>
/// <param name="id">Identifier of the location to have it's rating updated</param>
/// <param name="rating">Rating from the user input(1-5)</param>
/// <param name="currentRating">Current rating of the location</param>
/// <param name="rateCount">Current rate count of the location. will be increased by 1</param>
/// <returns>
/// The updated location.
/// </returns>
public async Task <ILocation> UpdateLocationRatingAsync(Guid id, double rating, double currenRating, int rateCount)
{
log4net.GlobalContext.Properties["AppName"] = Assembly.GetExecutingAssembly().FullName;
try
{
LocationEntity location = new LocationEntity();
using (var connection = Connection.CreateConnection())
using (NpgsqlCommand command = new NpgsqlCommand(LocationQueryHelper.GetUpdateLocationRatingQueryString(), connection))
{
await connection.OpenAsync();
double NewRating = 0;
int NewRateCount = rateCount + 1;
NewRating = (currenRating * rateCount + rating) / NewRateCount;
command.Parameters.AddWithValue(QueryConstants.ParId, NpgsqlDbType.Uuid, id);
command.Parameters.AddWithValue(QueryConstants.ParRateCount, NpgsqlDbType.Integer, NewRateCount);
command.Parameters.AddWithValue(QueryConstants.ParRating, NpgsqlDbType.Double, NewRating);
await command.ExecuteNonQueryAsync();
return(await GetLocationByIdAsync(id));
}
}
catch (Exception ex)
{
_log.Error(ex.StackTrace, ex);
throw new Exception(ex.StackTrace);
}
}
/// <summary>
/// Get Location by Id asynchronously.
/// </summary>
/// <param name="id">Identifier of the location to be retrieved.</param>
/// <returns>
/// The location.
/// </returns>
public async Task <ILocation> GetLocationByIdAsync(Guid id)
{
log4net.GlobalContext.Properties["AppName"] = Assembly.GetExecutingAssembly().FullName;
try
{
LocationEntity location = new LocationEntity();
using (var connection = Connection.CreateConnection())
using (NpgsqlCommand command = new NpgsqlCommand(LocationQueryHelper.GetSelectLocationByIdQueryString(), connection))
{
command.Parameters.AddWithValue(QueryConstants.ParId, NpgsqlDbType.Uuid, id);
await connection.OpenAsync();
DbDataReader dr = await command.ExecuteReaderAsync();
if (dr.Read())
{
location = new LocationEntity()
{
Id = new Guid(dr[0].ToString()),
Address = dr[1].ToString(),
Rating = Convert.ToDouble(dr[2]),
RateCount = Convert.ToInt32(dr[3])
};
}
}
return(Mapper.Map <ILocation>(location));
}
catch (Exception ex)
{
_log.Error(ex.StackTrace, ex);
throw new Exception(ex.StackTrace);
}
}
/// <summary>
/// Creates Location asynchronously.
/// </summary>
/// <param name="location">Location that will be created.</param>
/// <returns>
/// The created location.
/// </returns>
public async Task <ILocation> CreateLocationAsync(ILocation location)
{
log4net.GlobalContext.Properties["AppName"] = Assembly.GetExecutingAssembly().FullName;
try
{
using (var connection = Connection.CreateConnection())
using (NpgsqlCommand command = new NpgsqlCommand(LocationQueryHelper.GetInsertCreateLocationQueryString(), connection))
{
await connection.OpenAsync();
command.Parameters.AddWithValue(QueryConstants.ParId, NpgsqlDbType.Uuid, location.Id);
command.Parameters.AddWithValue(QueryConstants.ParAddress, NpgsqlDbType.Text, location.Address);
command.Parameters.AddWithValue(QueryConstants.ParRating, NpgsqlDbType.Double, location.Rating);
command.Parameters.AddWithValue(QueryConstants.ParRateCount, NpgsqlDbType.Double, location.RateCount);
await command.ExecuteNonQueryAsync();
return(await GetLocationByIdAsync(location.Id));
}
}
catch (Exception ex)
{
_log.Error(ex.StackTrace, ex);
throw new Exception(ex.StackTrace);
}
}
