Drupal 8 is a Great Way of Developing a Useful and Valuable Website - Part Twenty Two

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Upgrading is the process of leaving out the old and coming in with the new, meaning that if you wanted to upgrade your car, you’d be leaving behind the old car so that you can receive a spanking brand-new can.

In today’s article, we will be talking about data migration and how it works, in order to upgrade from a major version of Drupal to a newer version of Drupal, such as from Drupal 7 to Drupal 8. The website that is to be upgraded, must be migrated from the old site to a whole new website, so the Drupal code base has to change first, and then the data can be fed into the new website.

Fortunately for Drupal developers, Drupal 8 comes with a migration system, that they can use to migrate their data, from one Drupal version to the other. However, the migration process is not an easy one, so you will have to build your own Drupal 8 website.

The process of migration involves taking data from an external source, to the current Drupal 8 website, so that nodes, users, configuration and any other important feature of your website, is automatically created.

It is easy to import data from external sources onto Drupal 8, because the migrate system of Drupal 8, is designed as a framework that can facilitate migration, which is aimed at Drupal-to-Drupal migrations. Migrate, Migrate Drupal and the Migrate Drupal UI are the three core modules involved in the migrate system of Drupal 8.

When a website is moved from one previous major version of Drupal to a newer version, then we know this as an upgrade. Content can be pulled into Drupal, from about anywhere, thanks to the migration system that is integrated into Drupal 8.

Any SQL data source extraction as well as any previous version of Drupal database, is supported by the core API. The ins and outs of extracting data from different data-stores, is understood by the Drupal framework, due to the source plugins mechanism.

The intricacies of Drupal’s database schema, field system or password algorithms are not fully understood by the migrate framework. So, this is where the work gets really complicated, and things must go from automated to manually. A lot of the database migration, would have to be manually done, especially if there are a lot of custom made applications on the old website, which need to be migrated.

An array of content as a new Drupal user is saved, to make it possible to for the migrate framework to understand entities, fields and configuration, because this is part of data migration in Drupal 8.

Things such as content type configuration, are understood very well by the migrate system. Whatever fields which have been defined by a user, for an application, can be automatically imported by the migrate system.

Prior to saving the data the migrate system, can validate the content for each field type. Content types, user accounts, complex and simple configuration and roles and permissions, can be imported and created by the migrate system found in Drupal 8.

The data extracted from the data source is mapped to the Drupal definition of that data, by creating migration plugins. Migrations are not just allowed to be written by the migrate system, but the developer can use the UI or Drush to execute those migrations.

Rolling back a current migration, running a partial migration and running an individual migration, are some of the things that a developer can accomplish with the migrate system provided by Drupal 8.

Thank you for reading this article!!! 

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Hernando Cadet

Hi every one, I obtained a bachelor's degree in Bioinformatics back in 2006, from Claflin University, after I received my bachelor's degree, I gained full time employment as a software engineer at a Video Relay Service company, maintaining databases and developing software for a new developed device called the VPAD.

I worked at that company for two years, then I became a web developer, and worked for a magazine for three years. After that job, I worked as a Drupal web developer, as a subcontractor for the NIH, for a year and then left the job to go back to school.

Hernando Cadet

Collaboratively administrate empowered markets via plug-and-play networks. Dynamically procrastinate B2C users after installed base benefits. Dramatically visualize customer directed convergence without

Collaboratively administrate empowered markets via plug-and-play networks. Dynamically procrastinate B2C users after installed base benefits. Dramatically visualize customer directed convergence without revolutionary ROI.