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

Reading several files at the same time


Sometimes you have several files to read, all with the same structure, but different data. In this recipe, you will see how to read those files in a single step. The example uses a list of files containing names of museums in Italy.

Getting ready

You must have a group of text files in a directory, all with the same format. In this recipe, the names of these files start with museums_italy_ for example, museums_italy_1, museums_italy_2, museums_italy_roma, museums_italy_genova, and so on.

Each file has a list of names of museums, one museum on each line.

How to do it...

Carry out the following steps:

  1. Create a new transformation.

  2. Drop a Text file input step onto the work area.

  3. Under the File or directory tab, type the directory where the files are.

  4. In the Regular Expression textbox, type: museums_italy_.*\.txt

  5. Then click on the Add button. The grid will be populated, as shown in the following screenshot:

    Note

    ${Internal.Transformation.Filename.Directory} is a variable...