Book Image

Talend Open Studio Cookbook

By : Rick Barton
Book Image

Talend Open Studio Cookbook

By: Rick Barton

Overview of this book

Data integration is a key component of an organization's technical strategy, yet historically the tools have been very expensive. Talend Open Studio is the world's leading open source data integration product and has played a huge part in making open source data integration a popular choice for businesses worldwide.This book is a welcome addition to the small but growing library of Talend Open Studio resources. From working with schemas to creating and validating test data, to scheduling your Talend code, you will get acquainted with the various Talend database handling techniques. Each recipe is designed to provide the key learning point in a short, simple and effective manner.This comprehensive guide provides practical exercises that cover all areas of the Talend development lifecycle including development, testing, debugging and deployment. The book delivers design patterns, hints, tips, and advice in a series of short and focused exercises that can be approached as a reference for more seasoned developers or as a series of useful learning tutorials for the beginner.The book covers the basics in terms of schema usage and mappings, along with dedicated sections that will allow you to get more from tMap, files, databases and XML. Geared towards the whole lifecycle, the Talend Open Studio Cookbook shows readers great ways to handle everyday tasks, and provides an insight into all areas of a development cycle including coding, testing, and debugging of code to provide start-to-finish coverage of the product.
Table of Contents (21 chapters)
Talend Open Studio Cookbook
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Common Type Conversions
Index

Splitting an input row into multiple outputs based on input conditions


Often, it is required to filter input data into multiple outputs depending upon given criteria, for instance, splitting customer data by region, as in this example, or by team. Another very common example is to split the input data into validated records and records that have been rejected due to having failed a quality check (see Checking a column against a list of allowed values in Chapter 3, Validating Data for examples of using tMap to filter invalid rows).

This recipe shows how the tMap output Expression filters are used to perform filtering of the nature described precedingly.

Getting ready

Open the job jo_cook_ch04_0060_multipleOutputs.

How to do it...

  1. When you open tMap you will see three identical output tables

  2. Click the Expression filter button for the table UK to open an expression field, as shown in the next screenshot.
  3. Drag the input column countryOfBirth into this box.

  4. Add .equals("UK") to the end of the expression...