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Talend Open Studio Cookbook
Talend Open Studio Cookbook

Talend Open Studio Cookbook: Getting familiar with Talend Open Studio will greatly enhance your data handling and integration capabilities. This is the perfect reference book for beginners and intermediates with a host of practical recipes that clarify even complex features.

By Rick Barton
$28.99 $19.99
Book Oct 2013 270 pages 1st Edition
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Product Details

Publication date : Oct 25, 2013
Length 270 pages
Edition : 1st Edition
Language : English
ISBN-13 : 9781782167266
Vendor :
Talend
Category :
Data
Languages :
Java (Intermediate)
Concepts :
Data Analysis
Tools :
Talend (Intermediate)
Table of content icon View table of contents Preview book icon Preview Book

Talend Open Studio Cookbook

Chapter 1. Introduction and General Principles

The aim of this book is to provide you, the Talend developer, with a set of common (and sometimes not so common) tasks and examples that, we hope, will help you in:

  • Developing Talend jobs more rapidly

  • Solving Talend issues more quickly

  • Gaining a wider knowledge of the Talend product

  • Gaining a better understanding of the capabilities of Talend

This cookbook is primarily intended as a reference guide, however, the chapters have been organized in such a way that it can also be used as a means of rapidly developing your Talend skills by working through the exercises in sequence from front to back.

For the more experienced developers, some of the recipes in this book may seem very simple, because they describe a feature of Talend that you may already know, but we are hoping that this isn't the case for everyone, and that there will be something in the book for developers of all levels of experience.

Many of the recipes in the book require you to complete sections of a partially built job, so it is assumed that in the real world you would be able to get to the starting point independently. Our thinking behind this is that we wanted to squeeze in as many recipes in the book as possible, so only the relevant steps that need to be performed and understood for a particular point to be made, are described in detail within each recipe.

Many any of the examples will write their output to the Talend log/console window when we could easily have written the data out to files or tables. However, the decision was made to provide an easy means (in most cases) of viewing the results of an exercise without having to leave the studio.

Before you begin

Before you begin the exercises in the book, it is worth becoming familiar with some of the key concepts and best practices.

Keep code changes small and test often

When developing using Talend, as with any other development tool, it is recommended to code in short bursts and test (run) frequently.

By keeping each change small, it is much easier to find where and what has caused problems during compilation and execution.

Chapter 10, Debugging, Logging, and Testing, is dedicated to debugging and logging; however, observing the preceding method will save time having to perform debugging steps that can sometimes take a long time.

Document your code

Talend sub-jobs have the ability to add titles, and every component in Talend has the option to add documentation for the component. Where you use Java, you should use the Java comment structures to document the code. Remember to use all these methods as you go along to ensure that your code is well documented.

Contexts and globalMap

context and globalMap are global areas used to store data that can be used by all components within a Talend job.

context variables are predefined prior to job execution in a context group, whereas globalMap variables are created on the fly at any point within a job.

Context variables

Context variables are used by Talend to store parameter information, and can be used:

  • To pass information into a job from the command line and/or a parent job

  • To manage values of parameters between environments

  • To store values within a job or set of jobs

Chapter 6, Managing Context Variables, is dedicated to the use and management of context variables within Talend

globalMap

globalMap is a very important construct within Talend, in that:

  • Almost every component will write information to globalMap once it completes execution (for example NB_LINE is the number of rows processed in a component).

  • Certain components, such as tFlowToIterate or tFileList, will store data in globalMap variables for use by downstream components.

  • Developers can read and write to globalMap to create global variables in an ad hoc fashion. The use of global variables can often be the best way to ensure code is simple and efficient.

Java

Talend is a Java code generator, so having a little Java knowledge can help when using Talend. There are many Java tutorials for beginners online, and a little time spent learning the basics will help speed up your understanding of Talend.

Other background knowledge

As a data integrator, you will be expected to understand many technologies and how to interface with them, and this book assumes a basic knowledge of many of the most frequent data sources and targets.

Chapter 7, Working with Databases, relates to using Talend with databases. We have chosen to use MySQL, because it is quick to install, simple to use, and readily available. Basic knowledge of SQL and MySQL will therefore be required to perform the exercises in this chapter.

Other chapters will also assume knowledge of csv files, MS Excel, XML, and web services.

Installing the software

This cookbook comes with a package of jobs and scripts that you will need to complete the recipes. The instructions for installing the code and scripts are detailed in the following section:

How to do it…

  1. All templates, completed code, and data are in the cookbook.zip file.

  2. Unzip cookbook.zip into a folder on your machine.

  3. Copy the directory cookbookData to a directory on your machine (we recommend C:\cookbookData or the linux/MacOS equivalent)

  4. Download and install the latest version of Talend Open Studio for enterprise service bus (ESB) from www.talend.com.

  5. Open Talend Open Studio, and you will be prompted to create a new project.

  6. Name the new project cookbook.

  7. Open the project.

  8. Right mouse click on the Job Designs folder in the Repository panel, and select the option Import Items.

  9. This opens the import wizard. Click the Select archive file option, and then navigate to your unzipped cookbook directory and select the zip file named cookbookTalendJobs.zip.

  10. Click on Finish to import all the Talend artifacts.

  11. If you copied your data to C:\cookbookData, then you can ignore the next steps, and you have completed the installation of the cookbook software.

  12. Open the cookbook context, as shown in the following screenshot, and click Next at the first window.

  13. Open the Values as a table panel and change the value of cookbookData to your chosen directory, as shown in the following screenshot:

  14. Click Finish to complete the installation process.

Enabling tHashInput and tHashOutput

Many of the exercises rely on the use of tHashInput and tHashOutput components. Talend 5.2.3 does not automatically enable these components for use in jobs. To enable these components perform the instructions in the following section:

How to do it…

  1. On the main menu bar navigate to File | Edit Project properties to open the properties dialogue.

  2. Select Designer then Palette Settings.

  3. Click on the Technical folder and then click on the button shown in the following screenshot to add this folder to the Show panel.

  4. Click on OK to exit the project settings.

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Page 1 of 4

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Key benefits

  • A collection of exercises covering all development aspects including schemas, mapping using tMap, database and working with files
  • Get your code ready for the production environment by including the use of contexts and scheduling of jobs in Talend
  • Includes exercises for debugging and testing of code
  • Many additional hints and tips regarding the exercises and their real-life applications

Description

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.

What you will learn

Manipulate schemas quickly and easily Validate your data and create test data Use Java code within Talend Debug your Talend code Use tMap effectively Create and manage files including complex file formats Access queues, web services, and XML within Talend Deploy, as well as schedule your Talend code

What do you get with eBook?

Product feature icon Instant access to your Digital eBook purchase
Product feature icon Download this book in EPUB and PDF formats
Product feature icon Access this title in our online reader with advanced features
Product feature icon DRM FREE - Read whenever, wherever and however you want
Buy Now

Product Details

Publication date : Oct 25, 2013
Length 270 pages
Edition : 1st Edition
Language : English
ISBN-13 : 9781782167266
Vendor :
Talend
Category :
Data
Languages :
Java (Intermediate)
Concepts :
Data Analysis
Tools :
Talend (Intermediate)

Table of Contents

21 Chapters
Talend Open Studio Cookbook Chevron down icon Chevron up icon
Talend Open Studio Cookbook
Credits Chevron down icon Chevron up icon
Credits
About the Author Chevron down icon Chevron up icon
About the Author
About the Reviewers Chevron down icon Chevron up icon
About the Reviewers
www.PacktPub.com Chevron down icon Chevron up icon
www.PacktPub.com
Preface Chevron down icon Chevron up icon
Preface
Introduction and General Principles Chevron down icon Chevron up icon
Introduction and General Principles
Before you begin
Installing the software
Enabling tHashInput and tHashOutput
Metadata and Schemas Chevron down icon Chevron up icon
Metadata and Schemas
Introduction
Hand-cranking a built-in schema
Propagating schema changes
Creating a generic schema from the existing metadata
Cutting and pasting schema information
Dropping schemas to empty components
Creating schemas from lists
Validating Data Chevron down icon Chevron up icon
Validating Data
Introduction
Enabling and disabling reject flows
Gathering all rejects prior to killing a job
Validating against the schema
Rejecting rows using tMap
Checking a column against a list of allowed values
Checking a column against a lookup
Creating validation rules for more complex requirements
Creating binary error codes to store multiple test results
Mapping Data Chevron down icon Chevron up icon
Mapping Data
Introduction
Simple mapping and tMap time savers
Creating tMap expressions
Using the ternary operator for conditional logic
Using intermediate variables in tMap
Filtering input rows
Splitting an input row into multiple outputs based on input conditions
Joining data using tMap
Hierarchical joins using tMap
Using reload at each row to process real-time / near real-time data
Using Java in Talend Chevron down icon Chevron up icon
Using Java in Talend
Introduction
Performing one-off pieces of logic using tJava
Setting the context and globalMap variables using tJava
Adding complex logic into a flow using tJavaRow
Creating pseudo components using tJavaFlex
Creating custom functions using code routines
Importing JAR files to allow use of external Java classes
Managing Context Variables Chevron down icon Chevron up icon
Managing Context Variables
Introduction
Creating a context group
Adding a context group to your job
Adding contexts to a context group
Using tContextLoad to load contexts
Using implicit context loading to load contexts
Turning implicit context loading on and off in a job
Setting the context file location in the operating system
Working with Databases Chevron down icon Chevron up icon
Working with Databases
Introduction
Setting up a database connection
Importing the table schemas
Reading from database tables
Using context and globalMap variables in SQL queries
Printing your input query
Writing to a database table
Printing your output query
Managing database sessions
Passing a session to a child job
Selecting different fields and keys for insert, update, and delete
Capturing individual rejects and errors
Database and table management
Managing surrogate keys for parent and child tables
Rewritable lookups using an in-process database
Managing Files Chevron down icon Chevron up icon
Managing Files
Introduction
Appending records to a file
Reading rows using a regular expression
Using temporary files
Storing intermediate data in the memory using tHashMap
Reading headers and trailers using tMap
Reading headers and trailers with no identifiers
Using the information in the header and trailer
Adding a header and trailer to a file
Moving, copying, renaming, and deleting files and folders
Capturing file information
Processing multiple files at once
Processing control/validation files
Creating and writing files depending on the input data
Working with XML, Queues, and Web Services Chevron down icon Chevron up icon
Working with XML, Queues, and Web Services
Introduction
Using tXMLMap to read XML
Using tXMLMap to create an XML document
Reading complex hierarchical XML
Writing complex XML
Calling a SOAP web service
Calling a RESTful web service
Reading and writing to a queue
Ensuring lossless queues using sessions
Debugging, Logging, and Testing Chevron down icon Chevron up icon
Debugging, Logging, and Testing
Introduction
Find the location of compilation errors using the Problems tab
Locating execution errors from the console output
Using the Talend debug mode – row-by-row execution
Using the Java debugger to debug Talend jobs
Using tLogRow to show data in a row
Using tJavaRow to display row information
Using tJava to display status messages and variables
Printing out the context
Dumping the console output to a file from within a job
Creating simple test data using tRowGenerator
Creating complex test data using tRowGenerator, tFlowToIterate, tMap, and sequences
Creating random test data using lookups
Creating test data using Excel
Testing logic – the most-used pattern
Killing a job from within tJavaRow
Deploying and Scheduling Talend Code Chevron down icon Chevron up icon
Deploying and Scheduling Talend Code
Introduction
Creating compiled executables
Using a different context
Adding command-line context parameters
Managing job dependencies
Capturing and acting on different return codes
Returning codes from a child job without tDie
Passing parameters to a child job
Executing non-Talend objects and operating system commands
Common Mistakes and Other Useful Hints and Tips Chevron down icon Chevron up icon
Common Mistakes and Other Useful Hints and Tips
Introduction
My tab is missing
Finding the code routine
Finding a new context variable
Reloads going missing at each row global variable
Dragging component globalMap variables
Some complex date formats
Capturing tMap rejects
Adding job name, project name, and other job specific information
Printing tMap variables
Stopping memory errors in Talend
Common Type Conversions Chevron down icon Chevron up icon
Common Type Conversions
Management of Contexts Chevron down icon Chevron up icon
Management of Contexts
Introduction
Manipulating contexts in Talend Open Studio
Understanding implicit context loading
Understanding tContextLoad
Manually checking and setting contexts
Index Chevron down icon Chevron up icon
Index

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Authors (1)

Profile icon Richard D Barton (GBP)
Rick Barton is a freelance consultant who has specialized in data integration and ETL for the last 13 years as part of an IT career spanning over 25 years. After gaining a degree in Computer Systems from Cardiff University, he began his career as a firmware programmer before moving into Mainframe data processing and then into ETL tools in 1999. He has provided technical consultancy to some of the UKs largest companies, including banks and telecommunications companies, and was a founding partner of a Big Data integration consultancy. Four years ago he moved back into freelance development and has been working almost exclusively with Talend Open Studio and Talend Integration Suite, on multiple projects, of various sizes, in UK. It is on these projects that he has learned many of the lessons that can be found in this, his first book.
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