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Extract-Transform-Load library from ActiveWarehouse
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Ruby Extract-Transform-Load (ETL) tool. == Requirements * Ruby 1.8.5 or higher * Rubygems == Online Documentation Available at http://activewarehouse.rubyforge.org/docs/activewarehouse-etl.html == Features Current supported features: * ETL Domain Specific Language (DSL) - Control files are specified in a Ruby-based DSL * Multiple source types. Current supported types: * Fixed-width and delimited text files * XML files through SAX * Apache combined log format * Multiple destination types - file and database destinations * Support for extracting from multiple sources in a single job * Support for writing to multiple destinations in a single job * A variety of built-in transformations are included: * Date-to-string, string-to-date, string-to-datetime, string-to-timestamp * Type transformation supporting strings, integers, floats and big decimals * Trim * SHA-1 * Decode from an external decode file * Default replacement for empty values * Ordinalize * Hierarchy lookup * Foreign key lookup * Ruby blocks * Any custom transformation class * A variety of build-in row-level processors * Check exists processor to determine if the record already exists in the destination database * Check unique processor to determine whether a matching record was processed during this job execution * Copy field * Rename field * Hierarchy exploder which takes a tree structure defined through a parent id and explodes it into a hierarchy bridge table * Surrogate key generator including support for looking up the last surrogate key from the target table using a custom query * Sequence generator including support for context-sensitive sequences where the context can be defined as a combination of fields from the source data * New row-level processors can easily be defined and applied * Pre-processing * Truncate processor * Post-processing * Bulk import using native RDBMS bulk loader tools * Virtual fields - Add a field to the destination data which doesn't exist in the source data * Built in job and record meta data * Support for type 1 and type 2 slowly changing dimensions * Automated effective date and end date time stamping for type 2 * CRC checking == Dependencies ActiveWarehouse ETL depends on the following gems: * ActiveSupport Gem * ActiveRecord Gem * FasterCSV Gem * AdapterExtensions Gem == Usage Once the ActiveWarehouse ETL gem is installed jobs can be invoked using the included `etl` script. The etl script includes several command line options and can process multiple control files at a time. Command line options: * <tt>--help, -h</tt>: Display the usage message. * <tt>--config, -c</tt>: Specify a database.yml configuration file to use. * <tt>--limit, -l</tt>: Specify a limit to the number of rows to process. This option is currently only applicable to database sources. * <tt>--offset, -o</tt>: Specify the start offset for reading from the source. This option is currently only applicable to database sources. * <tt>--newlog, -n</tt>: Instruct the engine to create a new ETL log rather than append to the last ETL log. * <tt>--skip-bulk-import, -s</tt>: Skip any bulk imports. * <tt>--read-locally</tt>: Read from the local cache (skip source extraction) == Control File Examples Control file examples can be found in the examples directory. == Running Tests Current state: - 11 failures on MySQL - 1 failure on Postgres The tests require: - gem install shoulda - gem install flexmock - gem install pg (if you want to run the tests on pg) - gem install spreadsheet - gem install tmail The tests subfolder contains examples database.yml for mysql and postgres. To run the tests: - rake test DB=postgresql (for postgres) - otherwise just rake test == Feedback This is a work in progress. Comments should be made on the activewarehouse-discuss mailing list at the moment. Contributions are always welcome.