Book Image

Pentaho Data Integration Cookbook - Second Edition - Second Edition

Book Image

Pentaho Data Integration Cookbook - Second Edition - Second Edition

Overview of this book

Pentaho Data Integration is the premier open source ETL tool, providing easy, fast, and effective ways to move and transform data. While PDI is relatively easy to pick up, it can take time to learn the best practices so you can design your transformations to process data faster and more efficiently. If you are looking for clear and practical recipes that will advance your skills in Kettle, then this is the book for you. Pentaho Data Integration Cookbook Second Edition guides you through the features of explains the Kettle features in detail and provides easy to follow recipes on file management and databases that can throw a curve ball to even the most experienced developers. Pentaho Data Integration Cookbook Second Edition provides updates to the material covered in the first edition as well as new recipes that show you how to use some of the key features of PDI that have been released since the publication of the first edition. You will learn how to work with various data sources – from relational and NoSQL databases, flat files, XML files, and more. The book will also cover best practices that you can take advantage of immediately within your own solutions, like building reusable code, data quality, and plugins that can add even more functionality. Pentaho Data Integration Cookbook Second Edition will provide you with the recipes that cover the common pitfalls that even seasoned developers can find themselves facing. You will also learn how to use various data sources in Kettle as well as advanced features.
Table of Contents (21 chapters)
Pentaho Data Integration Cookbook Second Edition
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
References
Index

Comparing files and folders


Kettle allows you to compare files and folders through the following job entries: File Compare and Compare folder. In this recipe, you will use the first of those entries, which is used for comparing the content of two files. Assume that periodically you receive a file with new museums data to incorporate into your database. You will compare the new and the previous version of the file. If the files are equal, you do nothing, but if they are different, you will read the new file.

Getting ready

To create and test this recipe, you will need two files: the older version of the museum file (LastMuseumsFileReceived.xml), and the new file (NewMuseumsFileReceived.xml).

On the book's website, you will find sample files to play with. In particular, NewMuseumsFileReceived(equal).xml is equal to the LastMuseumsFileReceived.xml file, and NewMuseumsFileReceived(different).xml, as implied by its name, is different. With these files, you will be able to test the different situations...