Find_by_sql and date_format

ruby-talk
1

Hello,

I'm beginning my first project in Ruby (and Rails) and running into an issue. I need to pull some data out of mysql using the date_format command but ActiveRecord is not appreciating my sql. I'm doing something like:

  Table.find_by_sql( [ 'select column1, date_format("%Y%m%d", column2) as column2 from table where column1 = ?', some_data ] );

More or less it looks like that. The key problem seems to be the date_format has %'s in it and it gives me:

  malformed format string - %Y

And the trace:

  /usr/local/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/active_record/base.rb:1418:in `%'
  /usr/local/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/active_record/base.rb:1418:in `sanitize_sql_array'
  /usr/local/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/active_record/base.rb:1387:in `sanitize_sql'
  /usr/local/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/active_record/base.rb:427:in `find_by_sql'

Is there any way to handle this situation? I also tried using the raw connection, but that didn't seem to take bind variables which I found unsatisfying, so didn't pursue it too closely.

Any help/pointers are greatly appreciated.

felix

···

--
felix sheng
http://comments.deasil.com/

2

Felix,

According to http://dev.mysql.com/doc/refman/4.1/en/date-and-time-functions.html
, the function should be called as:

DATE_FORMAT(date,format)

That is, the format is the SECOND argument.

-A

···

On 3/25/07, felix sheng <felix@deasil.com> wrote:

Hello,

I'm beginning my first project in Ruby (and Rails) and running into
an issue. I need to pull some data out of mysql using the date_format
command but ActiveRecord is not appreciating my sql. I'm doing
something like:

        Table.find_by_sql( [ 'select column1, date_format("%Y%m%d", column2)
as column2 from table where column1 = ?', some_data ] );

More or less it looks like that. The key problem seems to be the
date_format has %'s in it and it gives me:

        malformed format string - %Y

And the trace:

        /usr/local/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/
active_record/base.rb:1418:in `%'
        /usr/local/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/
active_record/base.rb:1418:in `sanitize_sql_array'
        /usr/local/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/
active_record/base.rb:1387:in `sanitize_sql'
        /usr/local/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/
active_record/base.rb:427:in `find_by_sql'

Is there any way to handle this situation? I also tried using the raw
connection, but that didn't seem to take bind variables which I found
unsatisfying, so didn't pursue it too closely.

Any help/pointers are greatly appreciated.

felix