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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.

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Talend Open Studio Cookbook

Chapter 2. Metadata and Schemas

This chapter contains a detailed discussion about metadata and Talend schemas and recipes that highlight some of the less used / less known features associated with schemas, along with more commonly used features, such as generic and fixed schemas:

  • Hand-cranking a built-in schema
  • Propagating schema changes
  • Creating a generic schema from existing metadata
  • Cutting and pasting schema information
  • Dropping schemas to empty components
  • Creating schemas from lists

Introduction

Managing metadata is one of the most important aspects of developing Talend jobs, and the most common form of metadata used within Talend jobs is the schema.

Schema metadata

For successful development of jobs, it is essential that the metadata defined for a data source accurately describes the format of its underlying data. Failure to correctly define the data will result in numerous errors and waste of time tracking down problems with data formats that could otherwise be avoided.

Talend provides a host of wizards for capturing metadata from a variety of data sources such as database tables, delimited files, and Excel worksheets and stores them within its built-in metadata repository.

Schemas

Talend stores metadata definitions in schemas, which may be built in to individual components or stored in its metadata repository, as shown in the following screenshot:

Schemas

In general, it is best practice to define source and target metadata using a repository schema and mid-flow metadata as a...

Hand-cranking a built-in schema

In this recipe, we are presented with a CSV file that does not have a heading row and needs to create a schema for the data. This is a basic recipe with which most readers should be familiar: however, it does provide a framework for discussion of some of the more important principles of Talend schemas.

The record we will be defining is as follows:

John Smith,27/11/1990,2012-01-10 10:24:54.953

As you can see this contains the fields; first name, last name, date of birth, timestamp, and age. Note that age is an empty string.

Getting ready

Open a new Talend Job (jo_cook_ch02_0000_handCrankedSchema), so that the right-hand palette becomes available.

How to do it…

  1. Drag a tFileInputDelimited component from the palette, and open it by double clicking it.
  2. Click the Edit Schema button (), shown in the following screenshot, to open the schema editor:
    How to do it…
  3. Click the + button to add a column:
    How to do it…
  4. Type name into the column, and set the length to 50.
  5. Click the + button three...

Propagating schema changes

Often during development, it is necessary to change schemas by adding, removing, or re-ordering columns. This often is a very onerous task, especially if a schema is used in multiple jobs.

As discussed earlier in this chapter, storing schemas in the metadata enables the schema to be re-used. If a shared schema is changed, then Talend will prompt to find out if the changes should be applied to all jobs.

If the change is performed, then the next time that the job is opened, the component using the schema will normally be highlighted as in error, because the schema no longer matches.

Talend provides mechanisms within the schema dialogues that takes some of the pain away from ensuring that changes are assimilated into all the jobs.

Getting ready

Open the Talend Job jo_cook_ch02_0010_propagateSchema so that the right-hand palette becomes available. Then, from the metadata palette, open the Generic schema sc_cook_0010_genericCustomer.

How to do it…

  1. Add a new field emailAddress...

Creating a generic schema from the existing metadata

Any schema can be easily converted into a generic schema to enable it to be re-used. The following recipe shows two methods of creating generic schemas; the first from a pre-existing schema in the metadata repository and the second from a built-in schema.

How to do it…

From repository schema

  1. Open repository schema fd_cook_0020_customerDelimited that can be found in the delimited schemas section under Chapter2, ensuring that you click the metadata, rather than the parent schema.
    How to do it…
  2. Right-click metadata, and then select copy to Generic schema. This creates a schema fd_cook_0020_customerDelimited.
  3. Move the new schema to the chapter 2 folder and double click it to edit it.
  4. Change the name to sc_cook_0020_genericCustomer1.

From a built-in schema

  1. Open the Talend Job jo_cook_ch02_0020_builtInSchema and open the tFileOutput Delimited component.
  2. Click the highlighted button, shown in the following screenshot:
    How to do it…
  3. This will open a windows file save dialogue...

Cutting and pasting schema information

This technique is a real time saver, but isn’t always immediately obvious, because the schema dialogue does not contain a right-click option.

Getting ready

Make a copy of the job jo_cook_ch02_0020_builtInSchema, rename it to jo_cook_ch02_0030_copySchema, and open the new job.

How to do it…

  1. Drag a tFileOutputExcel component from the right-hand palette.
  2. Open tFileOutputDelimited, and then open the schema.
  3. Click the left-hand panel and press Ctrl+A to select all the columns.
  4. Press Ctrl+C to copy the highlighted columns.
  5. Open the tFileOutputExcel component, and then open the schema. It should be blank.
  6. Press CTRL+V to paste the columns.

How it works…

Talend allows the standard windows shortcut keys to be used to cut and paste column information between schemas.

There’s more…

You can also use Ctrl+left mouse button to highlight individual columns and Shift+left mouse button to highlight a range as per the usual Windows conventions...

Introduction


Managing metadata is one of the most important aspects of developing Talend jobs, and the most common form of metadata used within Talend jobs is the schema.

Schema metadata

For successful development of jobs, it is essential that the metadata defined for a data source accurately describes the format of its underlying data. Failure to correctly define the data will result in numerous errors and waste of time tracking down problems with data formats that could otherwise be avoided.

Talend provides a host of wizards for capturing metadata from a variety of data sources such as database tables, delimited files, and Excel worksheets and stores them within its built-in metadata repository.

Schemas

Talend stores metadata definitions in schemas, which may be built in to individual components or stored in its metadata repository, as shown in the following screenshot:

In general, it is best practice to define source and target metadata using a repository schema and mid-flow metadata as a Built...

Hand-cranking a built-in schema


In this recipe, we are presented with a CSV file that does not have a heading row and needs to create a schema for the data. This is a basic recipe with which most readers should be familiar: however, it does provide a framework for discussion of some of the more important principles of Talend schemas.

The record we will be defining is as follows:

John Smith,27/11/1990,2012-01-10 10:24:54.953

As you can see this contains the fields; first name, last name, date of birth, timestamp, and age. Note that age is an empty string.

Getting ready

Open a new Talend Job (jo_cook_ch02_0000_handCrankedSchema), so that the right-hand palette becomes available.

How to do it…

  1. Drag a tFileInputDelimited component from the palette, and open it by double clicking it.

  2. Click the Edit Schema button (), shown in the following screenshot, to open the schema editor:

  3. Click the + button to add a column:

  4. Type name into the column, and set the length to 50.

  5. Click the + button three more times to...

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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.

Who is this book for?

Talend Open Studio Cookbook is principally aimed at relative beginners and intermediate Talend Developers who have used the product to perform some simple integration tasks, possibly via a training course or beginner's tutorials.

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

Product Details

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

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Product Details

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

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Table of Contents

15 Chapters
1. Introduction and General Principles Chevron down icon Chevron up icon
2. Metadata and Schemas Chevron down icon Chevron up icon
3. Validating Data Chevron down icon Chevron up icon
4. Mapping Data Chevron down icon Chevron up icon
5. Using Java in Talend Chevron down icon Chevron up icon
6. Managing Context Variables Chevron down icon Chevron up icon
7. Working with Databases Chevron down icon Chevron up icon
8. Managing Files Chevron down icon Chevron up icon
9. Working with XML, Queues, and Web Services Chevron down icon Chevron up icon
10. Debugging, Logging, and Testing Chevron down icon Chevron up icon
11. Deploying and Scheduling Talend Code Chevron down icon Chevron up icon
12. Common Mistakes and Other Useful Hints and Tips Chevron down icon Chevron up icon
A. Common Type Conversions Chevron down icon Chevron up icon
B. Management of Contexts Chevron down icon Chevron up icon
Index Chevron down icon Chevron up icon

Customer reviews

Top Reviews
Rating distribution
Full star icon Full star icon Full star icon Full star icon Half star icon 4.4
(23 Ratings)
5 star 65.2%
4 star 21.7%
3 star 4.3%
2 star 4.3%
1 star 4.3%
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Fabio Apr 21, 2014
Full star icon Full star icon Full star icon Full star icon Full star icon 5
As Data Warehouse developer and engineer, I've been extensively used Talend for many years. Apart from the basic tutorials provided by Talend, however, my only source for learning has always been the proactive Talend online community.This book doesn't digress too much in theory and provides a full, comprehensive view on many every-day, concrete situations and their corresponding solving patterns. The learning-by-doing "recipe" approach followed by the book makes it easier to read and understand it. The book also provides a good foundation of XML principles; unfortunately lacks a chapter about the development of custom components, a scenario that is more likely to occur than expected.Prerequisites for the book are a basic knowledge of Java or any c-like object-oriented programming language, as well as a rudimentary understanding of relational concepts.I highly recommend this book for both IT experts and novices with a focus on system and data integration.​
Amazon Verified review Amazon
Reginald Joseph Nov 11, 2014
Full star icon Full star icon Full star icon Full star icon Full star icon 5
The author has clearly articulated on the basic. A must for any beginner to Talend.
Amazon Verified review Amazon
EDWIN D GARCIA SUAREZ Oct 22, 2015
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Excellent product! I used the book for learning talend.
Amazon Verified review Amazon
RASSINOUX PHILIPPE Aug 03, 2014
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Le livre complète très bien l'aide en ligne de la suite Talend.Les fichiers d'exemples "cookbook" à charger depuis le site de l'éditeur ont été soigneusement préparés.Travailler avec ce livre est un vrai plaisir.
Amazon Verified review Amazon
Steve May 05, 2021
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Great little insider to get you moving.
Amazon Verified review Amazon
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