# Object
class Object
  def to_sql
    case self
    when Numeric then self
    when NilClass then 'null'
    when String
      if encoding == Encoding::ASCII_8BIT
        format "x'%s'", unpack1('H*')
      else
        format "'%s'", gsub('\\', '\&\&').gsub("'", "''")
      end
    else
      raise ArgumentError, "No quoting implemented for #{self.class} (#{self})"
    end
  end
end