Book Image

Pentaho Data Integration Beginner's Guide - Second Edition - Second Edition

By : María Carina Roldán
Book Image

Pentaho Data Integration Beginner's Guide - Second Edition - Second Edition

By: María Carina Roldán

Overview of this book

Capturing, manipulating, cleansing, transferring, and loading data effectively are the prime requirements in every IT organization. Achieving these tasks require people devoted to developing extensive software programs, or investing in ETL or data integration tools that can simplify this work. Pentaho Data Integration is a full-featured open source ETL solution that allows you to meet these requirements. Pentaho Data Integration has an intuitive, graphical, drag-and-drop design environment and its ETL capabilities are powerful. However, getting started with Pentaho Data Integration can be difficult or confusing. "Pentaho Data Integration Beginner's Guide - Second Edition" provides the guidance needed to overcome that difficulty, covering all the possible key features of Pentaho Data Integration. "Pentaho Data Integration Beginner's Guide - Second Edition" starts with the installation of Pentaho Data Integration software and then moves on to cover all the key Pentaho Data Integration concepts. Each chapter introduces new features, allowing you to gradually get involved with the tool. First, you will learn to do all kinds of data manipulation and work with plain files. Then, the book gives you a primer on databases and teaches you how to work with databases inside Pentaho Data Integration. Moreover, you will be introduced to data warehouse concepts and you will learn how to load data in a data warehouse. After that, you will learn to implement simple and complex processes. Finally, you will have the opportunity of applying and reinforcing all the learned concepts through the implementation of a simple datamart. With "Pentaho Data Integration Beginner's Guide - Second Edition", you will learn everything you need to know in order to meet your data manipulation requirements.
Table of Contents (26 chapters)
Pentaho Data Integration Beginner's Guide
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Best Practices
Index

Time for action – loading the fact table using a range of dates obtained from the command line


Now you will get the range of dates from the command line and load the fact table using that range:

  1. Create a new transformation.

  2. With a Get system info step that you will find in the Input category of steps, get the first two arguments from the command line and name them date_from and date_to.

  3. By using a couple of steps, check that the arguments are not null, have the proper format (yyyy-mm-dd), and are valid dates.

  4. If something is wrong with the arguments, abort.

  5. If the arguments are valid, use a Set variables step to set two variables named DATE_FROM and DATE_TO.

  6. Save the transformation in the same folder, where you saved the transformation that loads the fact table.

  7. Test the transformation by providing valid and invalid arguments to see that it works as expected.

  8. Create a job and save it in the same folder in which you saved the job that loads the dimensions.

  9. Drag to the canvas a START and two transformation...