Ruby Sequel AS/400 connection issues - ruby-on-rails

Question

I need to connect to a AS/400 system using ODBC connection, and I'm using the Ruby sequel gem. My environment is just Ubuntu 14.04 running in virtual box. I'm able to run isql -v my.host.com and drop in to a sql console. When I try and do this from IRB, I get the error message.
require 'sequel'
db = Sequel.odbc(:drvconnect=>'driver={IBM i Access ODBC Driver};system=my.host.com;database=MYDBNAME;uid=MYUSERNAME;password=MYPASSWORD;DefaultLibraries=, *usrlibl;authentication=server')
tables = db[:QSYS2__SYSTABLES].where("TABLE_NAME like ?", "SYS%")
tables.each do |record|
puts record[:table_name]
end
#=> Sequel::DatabaseConnectionError: ODBC::Error: IM002 (0) [unixODBC][Driver Manager]Data source name not found, and no default driver specified
from /home/vagrant/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/sequel-4.32.0/lib/sequel/adapters/odbc.rb:21:in `drvconnect'
from /home/vagrant/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/sequel-4.32.0/lib/sequel/adapters/odbc.rb:21:in `connect'
from /home/vagrant/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/sequel-4.32.0/lib/sequel/connection_pool.rb:103:in `make_new'
from /home/vagrant/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/sequel-4.32.0/lib/sequel/connection_pool/threaded.rb:224:in `make_new'
from /home/vagrant/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/sequel-4.32.0/lib/sequel/connection_pool/threaded.rb:197:in `available'
from /home/vagrant/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/sequel-4.32.0/lib/sequel/connection_pool/threaded.rb:133:in `_acquire'
from /home/vagrant/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/sequel-4.32.0/lib/sequel/connection_pool/threaded.rb:147:in `block in acquire'
from /home/vagrant/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/sequel-4.32.0/lib/sequel/connection_pool/threaded.rb:265:in `block in sync'
from /home/vagrant/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/sequel-4.32.0/lib/sequel/connection_pool/threaded.rb:265:in `synchronize'
from /home/vagrant/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/sequel-4.32.0/lib/sequel/connection_pool/threaded.rb:265:in `sync'
from /home/vagrant/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/sequel-4.32.0/lib/sequel/connection_pool/threaded.rb:146:in `acquire'
from /home/vagrant/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/sequel-4.32.0/lib/sequel/connection_pool/threaded.rb:104:in `hold'
from /home/vagrant/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/sequel-4.32.0/lib/sequel/database/connecting.rb:251:in `synchronize'
from /home/vagrant/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/sequel-4.32.0/lib/sequel/adapters/odbc.rb:44:in `execute'
from /home/vagrant/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/sequel-4.32.0/lib/sequel/dataset/actions.rb:952:in `execute'
from /home/vagrant/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/sequel-4.32.0/lib/sequel/adapters/odbc.rb:97:in `fetch_rows'
from /home/vagrant/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/sequel-4.32.0/lib/sequel/dataset/actions.rb:141:in `each'
I'm not familiar at all with AS/400 or using ODBC connections, but if isql works then maybe it's a user permission error?
Here is my /etc/odbc.ini
[my.host.com]
Description = IBM i Access ODBC Driver
Driver = IBM i Access ODBC Driver
System = my.host.com
UserID = MYUSERNAME
Password = MYPASSWORD
Naming = 1
DefaultLibraries = *usrlibl;
Database = MYDBNAME
I should also mention that the AS/400 system is located remotely at the my.host.com, so I'm not trying to connect to some local running service. I am able to ping the IP address of that host though.
Edit: I've changed my driver in the drvconnect to match what's in the odbc.ini as per the suggestion below. Also I should note that I have a /etc/odbcinst.ini file with the following
[IBM i Access ODBC Driver]
Description = IBM i Access for Linux ODBC Driver
Driver = /opt/ibm/iaccess/lib/libcwbodbc.so
Setup = /opt/ibm/iaccess/lib/libcwbodbcs.so
Driver64 = /opt/ibm/iaccess/lib64/libcwbodbc.so
Setup64 = /opt/ibm/iaccess/lib64/libcwbodbcs.so
Threading = 0
DontDLClose = 1
UsageCount = 1
[IBM i Access ODBC Driver 64-bit]
Description = IBM i Access for Linux 64-bit ODBC Driver
Driver = /opt/ibm/iaccess/lib64/libcwbodbc.so
Setup = /opt/ibm/iaccess/lib64/libcwbodbcs.so
Threading = 0
DontDLClose = 1
UsageCount = 1

Answer 1

You have this:
require 'sequel'
db = Sequel.odbc(:drvconnect=>'driver={iSeries Access ODBC Driver}; system=my.host.com;...
But then you show this:
[my.host.com]
Description = IBM i Access ODBC Driver
Driver = IBM i Access ODBC Driver
If you actually have the IBM i Access ODBC Driver, Then that's what you should reference in your code, rather than iSeries Access ODBC Driver.

Answer 2

Figured it out! It turns out that when you have your /etc/odbc.ini defined with all your connection info, you don't need a connection string.
require 'sequel'
db = Sequel.odbc(drvconnect: '')
tables = db[:QSYS2__SYSTABLES].where("TABLE_NAME like ?", "SYS%")
tables.each { |r| puts r[:table_name] }
This query takes a stupid long time to run on my machine, but it does return all tables that start with "SYS". The only change I did need to make to my /etc/odbc.ini for this to work was to rename the DSN to "default"
[default]
Description = IBM i Access ODBC Driver
Driver = IBM i Access ODBC Driver
System = my.host.com
UserID = MYUSERNAME
Password = MYPASSWORD
Naming = 1
DefaultLibraries = *usrlibl;
Database = MYDBNAME
Just for anyone else that may run into this issue, here are a few other things I did along the way to get things working. My setup is Ubuntu 14.04
Install unixodbc and unixodbc-dev
My my.host.com needed to be added to my /etc/hosts since it didn't resolve on public DNS.
The driver filename I installed is called ibm-iaccess-1.1.0.4-1.0.amd64.deb
running ldd /opt/ibm/iaccess/lib64/libcwbodbc.so showed that there was a missing symlink.`
Added missing symlink for /usr/lib/x86_64-linux-gnu/libodbcinst.so.1 to /usr/lib/x86_64-linux-gnu/libodbcinst.so.2
That's it. Hope that helps other people too.