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Editorial Team
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Asked: 2026-05-17T06:57:11+00:00

I’m trying to use Sequel to access a MySQL database in Ruby. When I

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I’m trying to use Sequel to access a MySQL database in Ruby. When I try accessing a table which involves a date column, I am presented with an error. When I access a table without, it functions fine. What is wrong?

Example Code:

require 'rubygems'
require 'sequel'

DB = Sequel.connect(:adapter=>'mysql', :host=>'localhost', :database=>'db', :user=>'user', :password=>'password')

event = DB[:table]

puts event.all

Error:

/usr/lib/ruby/1.8/date.rb:956:in `new_by_frags': ArgumentError: invalid date (Sequel::InvalidValue)

The error is not shown when a table which does not feature a date is accessed. This is running on Debian.

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1 Answer

  1. Editorial Team

    I had the same problem. It was caused by Sequel choking on MySQL’s zero date ‘0000-00-00’. The solution I used was to set

    Sequel::MySQL.convert_invalid_date_time = nil

    (found here: http://groups.google.com/group/sequel-talk/browse_thread/thread/152a4131bd280966).

    If you control the DB, you could also prevent MySQL storing zero dates using the NO_ZERO_DATE SQL mode: http://dev.mysql.com/doc/refman/5.1/en/server-sql-mode.html#sqlmode_no_zero_date.

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