README

UXDM helps developers migrate data from one system or format to another.

Installation

UXDM can be easily installed using Composer. Just run the following command from the root of your project.

composer require rapidwebltd/uxdm

If you have never used the Composer dependency manager before, head to the Composer website for more information on how to get started.

Migrations

Each UXDM migration requires a source object and at least one destination object. These determine where and how data is read and written. The UXDM package comes with a variety of source and destination objects, including the following.

PDO (PHP Database Object) Source & Destination
CSV (Comma Seperated Values) Source & Destination
Associative Array Source & Destination
JSON Files Source & Destination
XML Source & Destination
WordPress Post Source
WordPress User Source
Debug Output Destination

Source and destination objects can be used in any combination. Data can be migrated from a CSV and inserted into a database, just as easily as data can be migrated from a database to a CSV.

You can also use similar source and destination objects in the same migration. For example, a common use of UXDM is to use a PDO source and PDO destination to transfer data from one database to another.

Please see the Sources & Destinations page for more detailed documentation on their usage.

Examples

Database to database migration

An example of a basic database to database UXDM migration is shown below.

$pdoSource = new PDOSource(new PDO('mysql:dbname=old-test;host=127.0.0.1', 'root', 'password123'), 'users');

$pdoDestination = new PDODestination(new PDO('mysql:dbname=new-test;host=127.0.0.1', 'root', 'password456'), 'new_users');

$migrator = new Migrator;
$migrator->setSource($pdoSource)
         ->setDestination($pdoDestination)
         ->setFieldsToMigrate(['id', 'email', 'name'])
         ->setKeyFields(['id'])
         ->migrate();

This migration will move the id, email and name fields from the the users table in the old-test database, to the new_users table in the new-test database, replacing any existing records with the same id (the key field).

Mapping field names from source to destination

This examples shows how UXDM can map field names from source to destination.

$migrator = new Migrator;
$migrator->setSource($pdoSource)
         ->setDestination($pdoDestination)
         ->setFieldsToMigrate(['id', 'email', 'name'])
         ->setKeyFields(['id'])
         ->setFieldMap(['name' => 'full_name'])
         ->migrate();

This migration will move data from the source name field into the destination full_name field, while still moving the id and email fields normally.

Modifying data items during migration

The following example shows how you can use UXDM to modify items of data during the migration process.

$migrator = new Migrator;
$migrator->setSource($pdoSource)
         ->setDestination($pdoDestination)
         ->setFieldsToMigrate(['id', 'email', 'name'])
         ->setKeyFields(['id'])
         ->setDataItemManipulator(function($dataItem) {
            if ($dataItem->fieldName=='name') {
                $dataItem->value = strtoupper($dataItem->value);
            }
         })
         ->migrate();

This migration will move user data between two databases. However, it will also convert the value in the name field to uppercase.

Modifying data rows during migration

Adding data items

This examples shows how UXDM can modify each row of data while the migration is taking place.

$migrator = new Migrator;
$migrator->setSource($pdoSource)
         ->setDestination($pdoDestination)
         ->setFieldsToMigrate(['id', 'email', 'name'])
         ->setKeyFields(['id'])
         ->setDataRowManipulator(function($dataRow) {
            $dataRow->addDataItem(new DataItem('random_number', rand(1,1000)));
         })
         ->migrate();

This migration will add a random number into a field called random_number for each row of data. This will then be migrated to the destination database along with the other fields.

Removing data items

This example demonstrates how data items can be removed from a data row. You may wish to do this if you want to use its value, but not actually migrate it to the destination.

$migrator = new Migrator;
$migrator->setSource($pdoSource)
         ->setDestination($pdoDestination)
         ->setFieldsToMigrate(['id', 'email', 'name'])
         ->setKeyFields(['id'])
         ->setDataRowManipulator(function($dataRow) {
            $emailDataItem = $dataRow->getDataItemByFieldName('email');
            $dataRow->addDataItem(new DataItem('email_hash', md5($emailDataItem->value)));
            $dataRow->removeDataItem($emailDataItem);
         })
         ->migrate();

This migration gets the data from the email field in the source, creates a new email_hash data item which contains an md5 of the email address, and then removes the original email data item. This new email_hash will then be migrated to the destination database along with the other fields, excluding the removed email field.

rapidwebltd / uxdm

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