add DSN schemes for mysqli, oci8 and sqlsrv

[MrMitch]

This PR adds 3 schemes to be able to use the mysqli, oci8 and sqlsrv drivers in DSN configurations.

Adding mysqli provides another driver option for MySQL (in addition to pdo_mysql which can already be used with the mysql and mysql2 schemes).

Adding oci8 and sqlsrv improves developer experience because these drivers were previously not supported and the validation made in the Configuration class prevents these schemes from being overridden (even though they were not available !).

DoctrineBundle/DependencyInjection/Configuration.php

Lines 141 to 166 in f549108

	->arrayNode('driver_schemes')
	->useAttributeAsKey('scheme')
	->normalizeKeys(false)
	->scalarPrototype()->end()
	->info('Defines a driver for given URL schemes. Schemes being driver names cannot be redefined. However, other default schemes can be overwritten.')
	->validate()
	->always()
	->then(static function (array $value) {
	$unsupportedSchemes = [];
	foreach ($value as $scheme => $driver) {
	if (! in_array($scheme, ['pdo-mysql', 'pdo-sqlite', 'pdo-pgsql', 'pdo-oci', 'oci8', 'ibm-db2', 'pdo-sqlsrv', 'mysqli', 'pgsql', 'sqlsrv', 'sqlite3'], true)) {
	continue;
	}
	$unsupportedSchemes[] = $scheme;
	}
	if ($unsupportedSchemes) {
	throw new InvalidArgumentException(sprintf('Registering a scheme with the name of one of the official drivers is forbidden, as those are defined in DBAL itself. The following schemes are forbidden: %s', implode(', ', $unsupportedSchemes)));
	}
	return $value;
	})
	->end()
	->end()

Fixes #1718

[ostrolucky]

This is just alias map. If driver is not found in this map, it will default to whatever you specify there. If oci8 is missing from this array, it doesn't mean oci8 driver is not supported. And mapping mysqli to pdo_mysql is especially nasty thing, because mysqli is separate driver from pdo_mysql

[stof]

mapping a value to itself is totally useless as alias, because there is no aliasing taking place.

[stof]

I'm closing this because the suggested patch does not make sense. Those schemes already work as they correspond to the name of a DBAL driver.

[MrMitch]

@ostrolucky @stof you are correct, my issue was caused by something else.
Thank you for reviewing this and sorry for waisting your time.