错误-Ruby OCI8-错误的参数数量（0..1为2）

Question

When running this script:

require 'oci8'

  conn = OCI8.new('username', 'password', 'tnsname')
  cursor = conn.exec('SELECT 1+1 FROM dual')

  while r = cursor.fetch()
    puts r.join(',')
  end

  cursor.close
  conn.logoff

The following error message occurs:

   C:/tech/Ruby193/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `initi
alize': wrong number of arguments (2 for 0..1) (ArgumentError)
        from C:/tech/Ruby193/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb
:36:in `new'
        from C:/tech/Ruby193/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb
:36:in `require'
        from C:/tech/Ruby193/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb
:36:in `require'
        from C:/tech/Ruby193/lib/ruby/gems/1.9.1/gems/ruby-oci8-2.1.5-x86-mingw3
2/lib/oci8.rb:81:in `<top (required)>'
        from C:/tech/Ruby193/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb
:60:in `require'
        from C:/tech/Ruby193/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb
:60:in `rescue in require'
        from C:/tech/Ruby193/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb
:35:in `require'
        from u:/Ruby/test_oci_connect.rb:1:in `<main>'

I can use those credentials in SQLPLUS and I have both the gems and devkit installed. Can anyone assist with this issue or provide some clarity regarding the answer below?

Answer 1

The issue is caused by a mismatch in the Oracle DLLs architecture and your Ruby installation, or your System not finding the right DLLs.

Download the Oracle Instant Client . Its important that its the same arch that your Ruby is in, as it contains the necessary DLLs.

Unzip it somewhere on your HDD, such as:

C:/OracleInstantClient

Its also convenient to add both

 /network/admin/sqlnet.ora  \n/network/admin/tnsnames.ora  

to that folder.

Add the Instant Client's location to your System PATH. You should now be able to connect without that error, provided you've added the correct connection information.

Answer 2

I was getting the same error message, using a gem dependent on ruby-oci8 (dm-oracle-adapter for datamapper). Re-ran the install as per these instructions on a fresh environment :

Installing instant client for ruby-oci8

Double checked the path was set correctly and restarted my ruby console. And everything worked perfectly.

On the machine it didn't work on (above incorrect arguments error), I have Oracle 64 bit dlls installed for some other services. My theory is that it was conflicting with these dlls (Ruby-oci8 needs 32bit DLLs), even though there was nothing pointing to these in the path.

Also, if you get the warning "ext/oci8 not found" when running 'gem install ruby-oci8', let me save you some time. In my case, this was a red herring and didn't affect the function of the gem at all.

Answer 3

That problem doesn't seem related to OCI8 at all.

You are misleading us a little here by not showing the whole code.

From your error stack trace, I can tell that you have a class that's trying to initialize but you have defined a parameter to that method and you didn't mention it when creating your object.

What this really means is that you mentioned 2 parameters where it was expecting either nothing or just one parameter.

if you create a test.rb fiel and paste the code you show us above all by itself, does it work?