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

Run If

In Chapter 6, Managing Files, we created a job that checked for the existence of a file before it tried to process the file (good coding practice!). This used a Run If connector and readers who have already worked through this example will be familiar with its purpose and configuration.

Run If triggers a subjob or component when a defined condition is met, the existence (or non-existence) of a file, if the number of rows returned is greater than 100, and countless other conditions.

A Run If connection is made by right-clicking on the source component, selecting Trigger | Run If, and dropping the connector onto the target component. Click on the connector and enter a condition expression, in Java, into the Condition box.

Condition expressions can be dragged from components in the Outline tab to the Condition box.

Alternatively, pressing Ctrl + Space bar when your cursor is in the Condition box will display a list of global and context variables that can be used as condition expressions...