How to programmatically change table prefix in symfony2-doctrine - database

Question

I setup my symfony3 application to use 2 different databases. they are pretty much similar, structure of tables are the same and so the fields. The problem is, for example, the article table in db1 is called db1_article and article table in db2 is called db2_article. They have different data but same structure.
Now, I am setting up an entity for articles like that:
/**
* #ORM\Entity
* #ORM\Table(name="db1_article")
*/
class Article {
...
}
I'd prefer not to create a different entity for the same table in db2, can I dinamically define the table name somewhere in order to avoid duplications?
thanks

Answer 1

In order to change the table you've got to to update Doctrine's class meta data of that entity.
// getEntityManager() = $this->getDoctrine()->getManager()
$articleMetaData = $this->getEntityManager()->getMetadataFactory()->getMetadataFor(Article::class);
$metaDataBuilder = new ClassMetadataBuilder($articleMetaData);
$metaDataBuilder->setTable('db2_article');
$this->getEntityManager()->getMetadataFactory()
->setMetadataFor(Article::class, $metaDataBuilder->getClassMetadata());
$article2MetaData = $this->getEntityManager()->getClassMetadata(Article::class);
$article2MetaData->getTableName(); // is now db2_article
$this->getEntityManager()->find(Article::class, 1); // will query db2_article ID -> 1
To see what the class meta data is up to as in methods, see: Doctrine PHP Mapping

Answer 2

I would go for an approach using different entity managers for each database, so you can use the same entities.
//config.yml
doctrine:
dbal:
default_connection: first_entity_manager
connections:
first_entity_manager:
driver: %database_driver%
host: %database_host%
port: %database_port%
dbname: %database_name%
user: %database_user%
password: %database_password%
charset: UTF8
second_entity_manager:
driver: %database_2nd_driver%
host: %database_2nd_host%
port: %database_2nd_port%
dbname: %database_2nd_name%
user: %database_2nd_user%
password: %database_2nd_password%
charset: UTF8
orm:
default_entity_manager: first_entity_manager
entity_managers:
first_entity_manager:
connection: first_entity_manager
mappings:
AppBundle: ~
second_entity_manager:
connection: second_entity_manager
mappings:
AppBundle: ~
Then just program some functions to use the correct entity manager
$em_first = $this->getDoctrine()->getManager('first_entity_manager');
$em_second = $this->getDoctrine()->getManager('second_entity_manager');
$article_first_em = $em_first->getRepository('AppBundle:Article')->find(1);
$article_second_em = $em_second->getRepository('AppBundle:Article')->find(2);
For the table prefix I would use a table suscriber
Quite old but still works
How to setup table prefix in symfony2
http://docs.doctrine-project.org/projects/doctrine-orm/en/latest/cookbook/sql-table-prefixes.html