Book Image

Learning Pentaho Data Integration 8 CE - Third Edition

By : Carina Roldán
Book Image

Learning Pentaho Data Integration 8 CE - Third Edition

By: Carina Roldán

Overview of this book

Pentaho Data Integration(PDI) is an intuitive and graphical environment packed with drag-and-drop design and powerful Extract-Tranform-Load (ETL) capabilities. This book shows and explains the new interactive features of Spoon, the revamped look and feel, and the newest features of the tool including transformations and jobs Executors and the invaluable Metadata Injection capability. We begin with the installation of PDI software and then move on to cover all the key PDI concepts. Each of the chapter introduces new features, enabling you to gradually get practicing with the tool. First, you will learn to do all kind of data manipulation and work with simple plain files. Then, the book teaches you how you can work with relational databases inside PDI. Moreover, you will be given a primer on data warehouse concepts and you will learn how to load data in a data warehouse. During the course of this book, you will be familiarized with its intuitive, graphical and drag-and-drop design environment. By the end of this book, you will learn everything you need to know in order to meet your data manipulation requirements. Besides, your will be given best practices and advises for designing and deploying your projects.
Table of Contents (17 chapters)

Creating reusable Transformations

On occasions, you have bunches of steps that do common tasks and you notice that you will need them in other contexts. That is, you would copy, paste, and reuse part of your work unless you work with sub-transformations.

Creating and executing sub-transformations

Sub-transformations are, as the name suggests, Transformations inside Transformations.

The PDI proper name for a sub-transformation is mapping. However, as the word mapping is also used with other meanings in PDI—an example of that is the mapping of table fields with stream fields in a Table output step—we will use the more intuitive name sub-transformation.

A common reason to create sub-transformations is...