Comments on: ActiveRecord Oracle enhanced adapter version 1.1.1 released

By: Peter Jones

Peter Jones — Mon, 15 Dec 2008 09:40:22 +0000

Whoops! I missed the point about loading oci8 – seems OK now – at least the server starts.
Thanks

Peter

By: Raimonds Simanovskis

Raimonds Simanovskis — Wed, 10 Dec 2008 17:13:11 +0000

@Peter

It’s quite hard to tell what exactly is problem in your case.

Please verify that
1. Oracle Instant Client is installed correctly.
Can you connect to database using sqlnet?

2. ruby-oci8 1.0.3 is installed correctly.
Try something like:

ruby -r oci8 -e “OCI8.new(‘user’, ‘password’,'database’).exec(’select * from dual’) do |r| puts r.join(‘,’); end”

to verify that ruby-oci8 is working

3. activerecord-oracle_enhanced-adapter is installed correctly
Try
gem list activerecord-oracle_enhanced-adapter
to verify that it is installed.

Btw if you have further issues please use http://groups.google.com/group/oracle-enhanced discussion group – it will be more appropriate than long comments here :)

By: Peter Jones

Peter Jones — Wed, 10 Dec 2008 14:27:22 +0000

I have been having a problem similar to the one below in connecting to Oracle with the enhanced oracle adapter. This is taken from a similar post elsewhere. Do you have any ideas?

/usr/lib/ruby/gems/1.8/gems/activesupport-2.1.0/lib/active_support/dependencies.
rb:275:in `load_missing_constant’: uninitialized constant
ActiveRecord::Connecti
onAdapters::OracleEnhancedAdapter (NameError)
from
/usr/lib/ruby/gems/1.8/gems/activesupport-2.1.0/lib/active_support/
dependencies.rb:467:in `const_missing’
from
/home/scheng/rails/ServerMonitoringSystem/config/initializers/oracl
e_enhanced.rb:1
from
/usr/lib/ruby/gems/1.8/gems/activesupport-2.1.0/lib/active_support/
dependencies.rb:502:in `load’
from
/usr/lib/ruby/gems/1.8/gems/activesupport-2.1.0/lib/active_support/
dependencies.rb:502:in `load’
from
/usr/lib/ruby/gems/1.8/gems/activesupport-2.1.0/lib/active_support/
dependencies.rb:354:in `new_constants_in’
from
/usr/lib/ruby/gems/1.8/gems/activesupport-2.1.0/lib/active_support/
dependencies.rb:502:in `load’
from
/usr/lib/ruby/gems/1.8/gems/rails-2.1.0/lib/initializer.rb:475:in `
load_application_initializers’
from
/usr/lib/ruby/gems/1.8/gems/rails-2.1.0/lib/initializer.rb:474:in `
each’
… 7 levels…
from
/usr/lib/ruby/gems/1.8/gems/rails-2.1.0/lib/commands/runner.rb:39
from
/usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:27:in `gem_
original_require’
from
/usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:27:in `requ
ire’

—-
Peter

By: Sandi Metz

Sandi Metz — Mon, 28 Jul 2008 01:25:13 +0000

Raimonds,

Thanks. You rock.

By: Raimonds Simanovskis

Raimonds Simanovskis — Sun, 27 Jul 2008 19:12:53 +0000

This fix for partial_updates is now included in Oracle enhanced adapter version 1.1.5.

By: Raimonds Simanovskis

Raimonds Simanovskis — Thu, 24 Jul 2008 09:55:01 +0000

Sandi, thank you very much :)

Tried this change on our projects and it seems that it has solved the issue and now everything works with partial_updates enabled.

I will include this change in the next release of Oracle enhanced adapter.

By: Sandi Metz

Sandi Metz — Wed, 23 Jul 2008 23:00:53 +0000

I was getting
ORA-22920 row containing the LOB value is not locked
and
ORA-22990: LOB locators cannot span transactions
under rails 2.1, and setting partial_updates = false didn’t fix them all.

I finally had to actually debug it.
I made two changes to the ‘write_lobs’ method, adding ‘FOR UPDATE’ to the select and running the ’select_one’ and ‘write’ statements in an ‘uncached’ block.

See http://blog.potatocanyon.com/2008/07/rails-21-and-oracle_23.html for the gory details.

I now have partial_updates = true and all of my tests run without error.

Raimonds, any chance of getting these changes in the advanced adapter? Is there something I can do to help?

By: Guilherme

Guilherme — Tue, 22 Jul 2008 21:41:41 +0000

Ah! I’d tried
CGI::Session::ActiveRecordStore::Session.partial_updates = false
before with no success.

But with
ActiveRecord::Base.partial_updates = false
it works! Thanks!

By: Raimonds Simanovskis

Raimonds Simanovskis — Tue, 22 Jul 2008 19:35:13 +0000

As I wrote in my post this sometimes happens if partial updates are allowed – I could not repeat the problems so far to identify what is causing this. The workaround is to turn partial updates off.
If this is because of session store then do
CGI::Session::ActiveRecordStore::Session.partial_updates = false
If this is because of other ActiveRecord models then do
ActiveRecord::Base.partial_updates = false
or just do
self.partial_updates = false
in the particular model class definition where you have this issue with CLOB columns.

By: Guilherme

Guilherme — Tue, 22 Jul 2008 18:03:14 +0000

I’m having this problem:

OCIError (ORA-22920: row containing the LOB value is not locked):
lob.c:181:in oci8lib.so
/usr/local/lib/site_ruby/1.8/oci8.rb:1005:in `write’
/usr/lib/ruby/gems/1.8/gems/activerecord-oracle_enhanced-adapter-1.1.4/lib/active_record/connection_adapters/oracle_enhanced_adapter.rb:383:in `write_lobs’
/usr/lib/ruby/gems/1.8/gems/activerecord-oracle_enhanced-adapter-1.1.4/lib/active_record/connection_adapters/oracle_enhanced_adapter.rb:377:in `each’
/usr/lib/ruby/gems/1.8/gems/activerecord-oracle_enhanced-adapter-1.1.4/lib/active_record/connection_adapters/oracle_enhanced_adapter.rb:377:in `write_lobs’
/usr/lib/ruby/gems/1.8/gems/activerecord-oracle_enhanced-adapter-1.1.4/lib/active_record/connection_adapters/oracle_enhanced_adapter.rb:65:in `enhanced_write_lobs’