Talend MDM: How to use validation rules.

When creating a MDM data model, Talend offers you standard constraint possibilities.
You can choose whether fields are mandatory or not by setting the minimum and maximum occurrence. You may also set fixed values for a field.
Sometimes these options aren’t enough: you also want to use custom validations like email validation and URL validation. To solve this kind of requirements, Talend gives the possibility to use validation rules.

To illustrate this, I’ve created the entity ‘Customer’. As you can see FirstName and LastName are mandatory fields. However, for my business case, this data model doesn’t meet all my requirements: I also want validate the PostalCode(Belgian format: ‘9999’) and the Email before it saves the record.


How can you solve this within Talend?

You can create a validation rule by right clicking on the Customer entity and select Set the Validation Rule as shown below.

set validation rules

A window will pop up where you need to fill in a name for your validation rule. After you’ve chosen a name the following window will be shown.

set validation rule builder

You can add rules by clicking on:select xpath

For each rule you’ve to select an XPath, create an expression and set a message. You can add these by clicking on “…” in the field.

When creating an expression you can use the expression builder by clicking on “…”. The builder provides lots of predefined functions.

expression builder

After you have created and set your validation rules you’ve to deploy your model to the MDM server. After you’ve deployed the data model, we may test the validation rule by creating a new record. When you enter an invalid postalcode or an invalid emailaddress you’ll get the following message:

invalid postalcode

When entering the correct information you’ll get the following message:

save successfully

As you can see we’ve created a single validation rule set with different rules. The record can only be saved if all the rules of the validation set are met.

APEX & mobile seminar

On May 12 iAdvise hosted the “APEX and mobile seminar”.
With a turnout of more than 50 customers and interested developers, it indicates that mobile development is a real hype and the demand for mobile applications is rising.

This was the starting point for Stijn who started with an overview of the current situation and evolution of mobile applications.
It became clear that as a developer you can’t ignore mobile devices in the future.
He continued with explaining the challenges in mobile development and which guidelines and strategies could help in choosing the right technology for mobile applications.

Bart took the word and focused on developing web application for mobile devices using APEX.
By combining APEX with JQuery Mobile, HTML5 and CSS3, one could develop a mobile web application rather fast and simple.
Also implementing specific mobile behaviour(eg. “swiping”) and generating extra content on a tablet are rather simple using APEX.

After Bart, Jan showed a demo about the opportunities on offering APEX applications to users as a native app.
This sounds rather strange, but is possible. He had worked out a demo using PhoneGap, a javascript library which create the communication between a web application and the API of the mobile device.
The demo showed how the APEX application from the other demos was wrapped in a native app.
This makes it possible to add a new contact in the contact list of Jan’s IPhone.

After the demos, they gaves us a look at the future of mobile development with APEX, what we could expect in APEX 4.2 and how PhoneGap will take its place in this future.

At the end Johan Byl of Hestia showed us some points which had to be taken in mind when using mobile devices in a company.
This was also very interesting for application developers.
When developing applications, they’re not always keeping in mind that there will be a maintenance phase.
Eg. The support for the application will be allright, but what about the devices itself?
How will we get the application on all the mobile devices of our company?
Can everybody connect to the company network with his or her device?
Or should we prepare a different infrastructure/security?
These and a lot of other questions were explained and answered by Johan and showed us there are a lot of things we have to think over again before putting a mobile application in production.

At the end, a lucky attendee won an IPad3.
For him, iAdvise and regarding the positive feedback for others as well, it was a succesful seminar.

If you missed this seminar, there will another one at the office of our dutch colleagues in Breda, The Netherlands on May 24 2012.

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