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Pentaho Data Integration 4 Cookbook

Pentaho Data Integration 4 Cookbook

4.8 (8)
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Pentaho Data Integration 4 Cookbook

Pentaho Data Integration 4 Cookbook

4.8 (8)

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)
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Pentaho Data Integration 4 Cookbook
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Preface
Index

Executing steps even when your stream is empty


As you must know, a Kettle transformation is a group of linked steps through which data flows. Each step is meant to receive rows of data, process the data somehow, and deliver those rows to the next step or steps. If you agree with this definition, then you must realize that if there are no rows coming to the step, the step will not be executed.

This seems reasonable, but on occasion, it can be a problem. To get an idea of that kind of situation, look at the following scenarios:

  • You have a very simple transformation that reads a file, does some calculations, and finally updates a table with the system date and the number of processed rows. If the file doesn't exist or if it is empty, then no rows will go out from the file input step. Consequently and contrary to what you need to do, the step that updates the table will never be executed.

  • You need to set some variables with values that are supposed to be in a file. If the file exists and has the...

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