Doctrine migrations: create code for mysql and postgresql - doctrine

Question

I am using Doctrine ORM 2.6.1 in a Symfony 3.4.4 project.
Some of my instances work on a MySQL database, some on Postgresql, and a few installations even access a MicosoftSQL server. This works fine without any special changes to my project or entities, I only have to configure the corresponding connection parameters.
But: if I create migrations, only statements compatible with the current database connection are created in the migration file.
I develop with a postgres-conncection, so I only produce postgresql-statements, like:
class Version20180430083616 extends AbstractMigration
{
public function up(Schema $schema)
{
// this up() migration is auto-generated, please modify it to your needs
$this->abortIf($this->connection->getDatabasePlatform()->getName() !== 'postgresql', 'Migration can only be executed safely on \'postgresql\'.');
$this->addSql('DELETE FROM document_category');
$this->addSql('DROP SEQUENCE document_category_id_seq CASCADE');
$this->addSql('DROP TABLE document_category');
}
public function down(Schema $schema)
{
// this down() migration is auto-generated, please modify it to your needs
$this->abortIf($this->connection->getDatabasePlatform()->getName() !== 'postgresql', 'Migration can only be executed safely on \'postgresql\'.');
//...
}
}
My Question: How can I tell the migrations bundle to create statements for each platform, like:
class Version20180430083616 extends AbstractMigration
{
public function up(Schema $schema)
{
// this up() migration is auto-generated, please modify it to your needs
if($this->connection->getDatabasePlatform()->getName() == 'postgresql'){
$this->addSql('DELETE FROM document');
$this->addSql('DELETE FROM document_category');
$this->addSql('DROP SEQUENCE document_category_id_seq CASCADE');
$this->addSql('DROP TABLE document_category');
} else if($this->connection->getDatabasePlatform()->getName() == 'mysql'){
...
} else if ($this->connection->getDatabasePlatform()->getName() == 'mssql') { // MicrosoftSQL ?
...
}
}
}
Edit:
So, I think the only solution to my problem is to define multiple database connections and entity managers, and to always create a distinct migration for each connection type. According to this article, I can define several connections as:

Answer 1

I found a doable solution:
inf config.yml I define one connection and one EntityManager per database type:
doctrine:
dbal:
default_connection: pgdb
connections:
pgdb:
driver: pdo_pgsql
host: db
port: 5432
name: pgdb
user: postgres
password: example
charset: utf8
mapping_types:
enum: string
mysql:
driver: pdo_mysql
host: mysqlhost
port: 3306
name: mydb
dbname: mydb
user: root
password: xxx
charset: utf8mb4
default_table_options:
collate: utf8mb4_unicode_ci
mapping_types:
enum: string
mssql:
driver: pdo_sqlsrv
host: mssqlhost
port: 1433
name: msdb
dbname: testdb
user: sa
password: xxx
charset: utf8
mapping_types:
enum: string
orm:
auto_generate_proxy_classes: false
proxy_dir: '%kernel.cache_dir%/doctrine/orm/Proxies'
proxy_namespace: Proxies
entity_managers:
default:
connection: pgdb
naming_strategy: doctrine.orm.naming_strategy.underscore
mappings:
AppBundle: ~
my:
connection: mydb
naming_strategy: doctrine.orm.naming_strategy.underscore
mappings:
AppBundle: ~
ms:
connection: msdb
naming_strategy: doctrine.orm.naming_strategy.underscore
mappings:
AppBundle: ~
Then, I can issue the diff-command 3 times instead of only once
$ bin/console doctrine:migrations:diff --em=default
$ bin/console doctrine:migrations:diff --em=my
$ bin/console doctrine:migrations:diff --em=ms
This creates three migrations each starting with a fence line:
$this->abortIf($this->connection->getDatabasePlatform()->getName() !== 'mssql', 'Migration can only be executed safely on \'mssql\'.');
in which I exchange abortIf by skipIf, such that the migration process is not aborted if the current migration if for a different database type, but just skipped:
$this->skipIf($this->connection->getDatabasePlatform()->getName() !== 'mssql', 'Migration can only be executed safely on \'mssql\'.');
I hope this helps somebody.