Class: RubySnowflake::Row

Inherits:
Object
  • Object
show all
Includes:
Enumerable
Defined in:
lib/ruby_snowflake/row.rb

Constant Summary collapse

EPOCH_JULIAN_DAY_NUMBER = 
Date.new(1970,1,1).jd
TIME_FORMAT = 
"%s.%N".freeze

Instance Method Summary collapse

Constructor Details

#initialize(row_types, column_to_index, data) ⇒ Row

Returns a new instance of Row.



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# File 'lib/ruby_snowflake/row.rb', line 13

def initialize(row_types, column_to_index, data)
  @row_types = row_types
  @data = data
  @column_to_index = column_to_index
end

Instance Method Details

#[](column) ⇒ Object

see: docs.snowflake.com/en/developer-guide/sql-api/handling-responses#getting-the-data-from-the-results



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# File 'lib/ruby_snowflake/row.rb', line 20

def [](column)
  index = if column.is_a?(Numeric)
            Integer(column)
          else
            # Handle column names case-insensitively regardless of string or symbol
            @column_to_index[column.to_s.downcase]
          end

  return nil if index.nil?
  return nil if @data[index].nil?

  case @row_types[index][:type]
  when :boolean
    @data[index] == "true"
  when :date
    Date.jd(Integer(@data[index]) + EPOCH_JULIAN_DAY_NUMBER)
  when :fixed
    if @row_types[index][:scale] == 0
      Integer(@data[index])
    else
      BigDecimal(@data[index]).round(@row_types[index][:scale])
    end

  # snowflake treats these all as 64 bit IEEE 754 floating point numbers, and will we too
  when :float, :double, :"double precision", :real
    Float(@data[index])

  # Despite snowflake indicating that it sends the offset in minutes, the actual time in UTC
  # is always sent in the first half of the data. If an offset is sent it looks like:
  #   "1641008096.123000000 1980"
  # If there isn't one, it's just like this:
  #   "1641065696.123000000"
  # in all cases, the actual time, in UTC is the float value, and the offset is ignorable
  when :time, :datetime, :timestamp, :timestamp_ntz, :timestamp_ltz, :timestamp_tz
    Time.strptime(@data[index], TIME_FORMAT).utc
  else
    @data[index]
  end
end

#each ⇒ Object 



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# File 'lib/ruby_snowflake/row.rb', line 60

def each
  return to_enum __method__ unless block_given?

  @column_to_index.each_pair do |name, index|
    yield(name, self[index])
  end

  self
end

#keys ⇒ Object Also known as: columns 



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# File 'lib/ruby_snowflake/row.rb', line 70

def keys
  map { |k, _| k }
end

#to_s ⇒ Object 



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# File 'lib/ruby_snowflake/row.rb', line 80

def to_s
  to_h.to_s
end

#values ⇒ Object 



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# File 'lib/ruby_snowflake/row.rb', line 76

def values
  map { |_, v| v }
end