7 things that can go wrong with Ruby 1.9 string encodings

Good news, I am back in blogging :) In recent years I have spent my time primarily on eazyBI business intelligence application development where I use JRuby, Ruby on Rails, mondrian-olap and many other technologies and libraries and have gathered new experience that I wanted to share with others.

Recently I did eazyBI migration from JRuby 1.6.8 to latest JRuby 1.7.3 version as well as finally migrated from Ruby 1.8 mode to Ruby 1.9 mode. Initial migration was not so difficult and was done in one day (thanks to unit tests which (more...)

Easy Business Intelligence with eazyBI

I have been interested in business intelligence and data warehouse solutions for quite a while. And I have seen that traditional data warehouse and business intelligence tool implementations take quite a long time and cost a lot to set up infrastructure, develop or implement business intelligence software and train users. And many business users are not using business intelligence tools because they are too hard to learn and use.

Therefore some while ago a had an idea of developing easy-to-use business intelligence web application that you could implement and start to use right away and which would focus on ease-of-use (more...)

Oracle enhanced adapter 1.4.0 and Readme Driven Development

I just released Oracle enhanced adapter version 1.4.0 and here is the summary of main changes.

Rails 3.1 support

Oracle enhanced adapter GitHub version was working with Rails 3.1 betas and release candidate versions already but it was not explicitly stated anywhere that you should use git version with Rails 3.1. Therefore I am releasing new version 1.4.0 which is passing all tests with latest Rails 3.1 release candidate. As I wrote before main changes in ActiveRecord 3.1 are that it using prepared statement cache and using bind variables in many (more...)

Recent conference presentations

Recently I has not posted any new posts as I was busy with some new projects as well as during May attended several conferences and in some I also did presentations. Here I will post slides from these conferences. If you are interested in some of these topics then ask me to come to you as well and talk about these topics :)

Agile Riga Day

In March I spoke at Agile Riga Day (organized by Agile Latvia) about my experience and recommendations how to adopt Agile practices in iterative style.

RailsConf

(more...)

Oracle enhanced adapter 1.3.2 is released

I just released Oracle enhanced adapter version 1.3.2 with latest bug fixes and enhancements.

Bug fixes and improvements

Main fixes and improvements are the following:

  • Previous version 1.3.1 was checking if environment variable TNS_NAME is set and only then used provided database connection parameter (in database.yml) as TNS connection alias and otherwise defaulted to connection to localhost with provided database name. This was causing issues in many setups.
    Therefore now it is simplified that if you provide only database parameter in database.yml then it by default will be used as TNS connection alias (more...)

ruby-plsql-spec upgraded to use RSpec 2.0

Initial version of ruby-plsql-spec gem was using RSpec version 1.3. But recently RSpec 2.0 was released which API is not compatible with previous RSpec 1.x API and as a result plsql-spec utility was failing if just RSpec was upgraded to version 2.0.

Therefore I updated also ruby-plsql-spec to use latest RSpec 2.0 gem and released ruby-plsql-spec gem version 0.2.1. You can install the latest version with

gem install ruby-plsql-spec

Upgrade from previous version

If you previously already installed initial ruby-plsql-spec version 0.1.0 then you need to update your spec/spec_helper.rb file (more...)

ruby-plsql-spec gem and code coverage reporting

During recent Oracle OpenWorld conference I presented session PL/SQL unit testing can be fun! where I demonstrated how to do PL/SQL unit testing with Ruby:

Audience was quite interested and had a lot of questions and therefore it motivated me to do some more improvements to ruby-plsql-spec to make it easier for newcomers.

ruby-plsql-spec gem and plsql-spec command line utility

Initially ruby-plsql-spec was just repository of sample tests and if you wanted to start to use it in your project you had to manually pick necessary files and copy them to your project directory.

Now ruby-plsql-spec is (more...)

Oracle enhanced adapter 1.3.1 and how to use it with Rails 3

Rails 3.0 was released recently and therefore I am releasing new Oracle enhanced adapter version 1.3.1 which is tested and updated against latest Rails 3.0.0 version. You can read about main changes in oracle_enhanced adapter for Rails 3 support in my previous blog post. Latest version 1.3.1 mainly contains several bug fixes (which you can find in change log as well as in detailed commit list) as well as several new features that I will describe here.

Usage with Rails 3

I have improved a little bit configuration and loading of oracle_enhanced adapter (more...)

Moving blog from wordpress.com to Jekyll

Jekyll

Why to move?

This blog was hosted for several years on wordpress.com as it was the easiest way to host a blog when I started. But recently I was not very satisfied with it because of the following reasons:

  • I include code snippets in my blog posts quite often and several times I had issues with code formatting on wordpress.com. I used MarsEdit to upload blog posts but when I read previous posts back then quite often my < and > symbols were replaced with &lt; and &gt;.
  • I would prefer to write my posts in Textile and (more...)

Oracle enhanced adapter 1.3.0 is Rails 3 compatible

Rails 3 is in final finishing stage (currently in beta4) and therefore I released new Oracle enhanced adapter version 1.3.0 which I was working on during last months.

Rails 3 compatibility
rails3.gif

The major enhancement is that Oracle enhanced adapter is now compatible with Rails 3. To achieve that I also developed Oracle SQL compiler for Arel gem which is used now by ActiveRecord to generate SQL statements. When using Oracle enhanced adapter with Rails 3 you will notice several major changes:

  • Table and column names are always quoted and in uppercase to avoid the need for checking Oracle (more...)

Please vote for my Ruby session proposals at Oracle OpenWorld

oow2010.pngI am trying to tell more people at Oracle OpenWorld about Ruby and Rails and how it can be used with Oracle database. Unfortunately my session proposals were rejected by organizers but now there is a second chance to propose sessions at mix.oracle.com and top voted sessions will be accepted for conference. But currently my proposed sessions do not have enough votes :(

I would be grateful if my blog readers and Ruby on Oracle supporters would vote for my sessions Fast Web Applications Development with Ruby on Rails on Oracle and PL/SQL Unit Testing Can Be (more...)

ruby-plsql 0.4.2 – better support for object types and types in packages

I just released ruby-plsql version 0.4.2 which mainly adds support for more PL/SQL procedure parameter types. See change history file for more detailed list of changes.

Object types and object methods

Now you can use ruby-plsql to construct PL/SQL objects and call methods on these object. For example, if you have the following type defined:

CREATE OR REPLACE TYPE t_address AS OBJECT (
  street    VARCHAR2(50),
  city      VARCHAR2(50),
  country   VARCHAR2(50),
  CONSTRUCTOR FUNCTION t_address(p_full_address VARCHAR2)
    RETURN SELF AS RESULT,
  MEMBER FUNCTION display_address(p_separator VARCHAR2  (more...)

ActiveRecord Oracle enhanced adapter version 1.2.4

I have released maintenance version of ActiveRecrod Oracle enhanced adapter with some bug fixes and some new features. This is the last maintenance version for Rails 2, I have already done majority of work to support also Rails 3 in next adapter versions, but that deserves another post when it will be ready :).

Detailed changes can be found in change history file and commit log, here I will point out the main changes.

Schema and structure dump

There are several improvements in schema (rake db:schema:dump) and structure dump (rake db:structure:dump) tasks. Now structure dump is (more...)

Screencasts of Oracle PL/SQL unit testing with Ruby

In my previous post I already described how to do Oracle PL/SQL unit testing with Ruby. I now have named it as ruby-plsql-spec unit testing framework. But probably you didn’t want to read such long text or maybe it seemed for you too difficult to try it out therefore I prepared two screencasts to show how easy and fun it is :)

Testing simple function

The first example is based on classic BETWNSTR function example from utPLSQL tutorial.

Testing procedure that changes tables

Second example is based on Quest Code Tester (more...)

ruby-plsql 0.4.1 – support for package variables, views, dbms_output and more

Based on feedback from using ruby-plsql for PL/SQL unit testing I have release new version 0.4.1 with several new features. You can read about initial versions of ruby-plsql in previous blog posts.

Package variables

When you call methods on plsql Ruby object then ruby-plsql uses all_procedures and all_arguments data dictionary views to search for procedures and their argument metadata to construct corresponding PL/SQL block for execution. Unfortunately there are no corresponding data dictionary views for package variables (sometimes called “global variables”) that are defined in package specifications. Therefore there was no support for package variables in (more...)

Oracle PL/SQL unit testing with Ruby

Current PL/SQL unit testing options

Unit testing and TDD (test driven development) practices are nowadays one of the key software development practices. It is especially important if you are doing agile software development in small iterations where you need to automate unit testing as much as possible, as you cannot do manual regression testing of all existing and new functionality at the end of each iteration.

In some languages (like Java, Ruby, Python, C# etc.) there is quite good tools and frameworks support for unit testing and as a result there is quite high testing culture among top (more...)

More Oracle data types supported by ruby-plsql gem

I have just released ruby-plsql gem version 0.4.0 which provides many new features. You can read about initial versions of ruby-plsql in previous blog posts.

Oracle complex data type support

Initial versions of ruby-plsql supported just simple Oracle types like NUMBER, VARCHAR2, DATE, TIMESTAMP, CLOB, BLOB as PL/SQL procedure parameters. Now support for many more complex data types is added. See examples below how to call PL/SQL procedures with these complex data types.

PL/SQL Record

Let’s assume you have PL/SQL procedure with PL/SQL record type parameter (which most (more...)

Notes from Oracle OpenWorld 2009

People

Last week I participated in annual Oracle OpenWorld 2009 conference. There is quite wide coverage of conference in various web sites and blogs therefore I will write just some personal notes that I wanted to highlight.

For me the most value was meeting with different interesting people. At first thanks to Justin Kestelyn and all OTN team for Oracle community support. Oracle ACE dinner, bloggers meetup, OTN lounge and unconference were great places where to meet and discuss with interesting and active Oracle community members.

It was nice to meet Kuassi Mensah and Christopher Jones who are supporters of (more...)

New features in ActiveRecord Oracle enhanced adapter version 1.2.2

During the last months many new features have been implemented for ActiveRecord Oracle enhanced adapter which are now included in Oracle enhanced adapter version 1.2.2. You can find full list in change history file, here I will tell about the main ones.

Documentation

Now Oracle enhanced adapter has improved RDoc documentation for all public methods. So you can go to RDoc documentation of installed gem or go and view published documentation on-line.

Schema definition

There are many new features in schema definition methods that you can use in migration files:

  • When you use add_index then ActiveRecord is (more...)

How to install Oracle Database 10g on Mac OS X Snow Leopard

sl_oracle.jpgOracle Database 10g is not yet officially supported on new Mac OS X 10.6 Snow Leopard but thanks to comments at my previous tutorial I managed to do Oracle 10g installation on fresh Mac OS X Snow Leopard.

If you have upgraded from Leopard with Oracle 10g installation to Snow Leopard then most probably Oracle 10g should work fine and you should not do anything. These instructions are just for fresh installation of Snow Leopard.

And also please take in mind that Oracle 10g on Snow Leopard is not supported yet by Oracle and therefore please do not run (more...)