Book Image

Pentaho Data Integration 4 Cookbook

Book Image

Pentaho Data Integration 4 Cookbook

Overview of this book

Pentaho Data Integration (PDI, also called Kettle), one of the data integration tools leaders, is broadly used for all kind of data manipulation such as migrating data between applications or databases, exporting data from databases to flat files, data cleansing, and much more. Do you need quick solutions to the problems you face while using Kettle? Pentaho Data Integration 4 Cookbook explains Kettle features in detail through clear and practical recipes that you can quickly apply to your solutions. The recipes cover a broad range of topics including processing files, working with databases, understanding XML structures, integrating with Pentaho BI Suite, and more. Pentaho Data Integration 4 Cookbook shows you how to take advantage of all the aspects of Kettle through a set of practical recipes organized to find quick solutions to your needs. The initial chapters explain the details about working with databases, files, and XML structures. Then you will see different ways for searching data, executing and reusing jobs and transformations, and manipulating streams. Further, you will learn all the available options for integrating Kettle with other Pentaho tools. Pentaho Data Integration 4 Cookbook has plenty of recipes with easy step-by-step instructions to accomplish specific tasks. There are examples and code that are ready for adaptation to individual needs.
Table of Contents (17 chapters)
Pentaho Data Integration 4 Cookbook
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Preface
Index

Executing a job or a transformation whose name is determined at runtime


Suppose that you have a couple of transformations, but you do not want to run all of them. The transformation to be executed will depend on conditions only known at runtime. If you have just two transformations, you could explicitly call one or the other in a simple fashion. On the other hand, if you have several transformations or if you do not even know the names of the available transformations, you must take another approach. This recipe shows you how.

Suppose that you want to run one of the three sample transformations described in the introduction. The transformation to run will be different depending on the time of day:

  • Before 8:00 in the morning, you will call the Hello transformation

  • Between 8:00 and 20:00, you will call the transformation that generates random numbers

  • From 20:00 to midnight, you will call the transformation that lists files

Here's how to do it.

Getting ready

You will need the transformations described...