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
About the Author
About the Reviewers

Chapter 9. Global Variables and Contexts

In any kind of programming, variables are simply placeholders for values that are used in the execution of a program. The values in the variables might change on different executions. For example, the day_of_week variable might hold the value of Tuesday today, but Wednesday tomorrow. Variable values might also change within a single execution. For example, we might use a variable to hold the running total of invoices processed. As each invoice is processed, the value held in the variable will change.

The use of variables allows our jobs to be dynamic and not have hardcoded values in them.

In this chapter, we will learn about:

  • Studio global variables: The variables that the Studio makes available through the components we use in our integration jobs

  • User defined global variables: Ad-hoc variables that can be configured in your jobs

  • Job contexts: The variables we can create to execute jobs with different parameters for different environments or scenarios...