Book Image

Getting Started with Talend Open Studio for Data Integration

By : Jonathan Bowen
Book Image

Getting Started with Talend Open Studio for Data Integration

By: Jonathan Bowen

Overview of this book

Talend Open Studio for Data Integration (TOS) is an open source graphical development environment for creating custom integrations between systems. It comes with over 600 pre-built connectors that make it quick and easy to connect databases, transform files, load data, move, copy and rename files and connect individual components in order to define complex integration processes. "Getting Started with Talend Open Studio for Data Integration" illustrates common uses and scenarios in a simple, practical manner and, building on knowledge as the book progresses, works towards more complex integration solutions. TOS is a code generator and so does a lot of the "heavy lifting"ù for you. As such, it is a suitable tool for experienced developers and non-developers alike. You'll start by learning how to construct some common integrations tasks ñ transforming files and extracting data from a database, for example. These building blocks form a "toolkit"ù of techniques that you will learn how to apply in many different situations. By the end of the book, once complex integrations will appear easy and you will be your organization's integration expert! Best of all, TOS makes integrating systems fun!
Table of Contents (22 chapters)
Getting Started with Talend Open Studio for Data Integration
Credits
Foreword
Foreword
About the Author
Acknowledgement
About the Reviewers
www.PacktPub.com
Preface
Index

Aggregating data


An aggregation operation can often be thought of as summing some data items, but the Studio also uses aggregating functions to work out counts, minimum and maximum values, and average values, amongst other things. We will look at a simple data summation example.

The file we will work with is in the resources directory of this chapter and is named invoices.csv. It shows a number of invoices with the invoice number, customer name, and invoice amount. We want to extract the sum of the invoices for each customer.

  1. Create a new job and name it Aggregating.

  2. Create a File delimited metadata item for the invoices.csv file, following the steps we have used previously. Name column 0 as invoice_number, column 1 as customer_name, and column 2 as invoice_value. The Studio will choose a data type of float for the invoice value. It is better to use the data type BigDecimal, which preserves the two decimal places we expect with monetary values, so change this in the Type column of the final...