instance method _quote

# File activerecord/lib/active_record/connection_adapters/abstract/quoting.rb, line 217
        def _quote(value)
          case value
          when String, Symbol, ActiveSupport::Multibyte::Chars
            "'#{quote_string(value.to_s)}'"
          when true       then quoted_true
          when false      then quoted_false
          when nil        then "NULL"
          # BigDecimals need to be put in a non-normalized form and quoted.
          when BigDecimal then value.to_s("F")
          when Numeric, ActiveSupport::Duration then value.to_s
          when Type::Binary::Data then quoted_binary(value)
          when Type::Time::Value then "'#{quoted_time(value)}'"
          when Date, Time then "'#{quoted_date(value)}'"
          when Class      then "'#{value}'"
          else raise TypeError, "can't quote #{value.class.name}"
          end
        end