[dbal]: make dbal connection config usable again

right now user cannot declare connection options.

Reason is that always 'connection' => 'url' was set which dbal always prefers over other
connection settings. With this fix connection can be defined dbal compliant like this:

      connection:
        host: 'localhost'
        port: '3306'
        dbname: 'app'
        user: 'app'
        password: ''

'dsn only' works like before.

PS3-4:
 - added config tests

PS5:
 - if a fq dsn and connection is set dsn should be prefered

PS6:
 - better naming for dbname in tests

Author: ssiergl

Diff for: pkg/dbal/DbalConnectionFactory.php

@@ -45,8 +45,7 @@ public function __construct($config = 'mysql:')
             $config = $this->parseDsn($config);
         } elseif (is_array($config)) {
             if (array_key_exists('dsn', $config)) {
-                $config = array_replace_recursive($config, $this->parseDsn($config['dsn']));
-
+                $config = array_replace_recursive($config, $this->parseDsn($config['dsn'], $config));
                 unset($config['dsn']);
             }
         } else {
@@ -92,7 +91,13 @@ private function establishConnection(): Connection
         return $this->connection;
     }
 
-    private function parseDsn(string $dsn): array
+    /**
+     * @param string     $dsn
+     * @param array|null $config
+     *
+     * @return array
+     */
+    private function parseDsn(string $dsn, array $config = null): array
     {
         if (false === strpos($dsn, ':')) {
             throw new \LogicException(sprintf('The DSN is invalid. It does not have scheme separator ":".'));
@@ -135,6 +140,21 @@ private function parseDsn(string $dsn): array
 
         $doctrineScheme = $supported[$scheme];
 
+        if ($scheme.':' === $dsn && is_array($config) && array_key_exists('connection', $config)) {
+            $default = [
+                'driver' => $doctrineScheme,
+                'host' => 'localhost',
+                'port' => '3306',
+                'user' => 'root',
+                'password' => '',
+            ];
+
+            return [
+                'lazy' => true,
+                'connection' => array_replace_recursive($default, $config['connection']),
+            ];
+        }
+
         return [
             'lazy' => true,
             'connection' => [

Diff for: pkg/dbal/Tests/DbalConnectionFactoryConfigTest.php

@@ -101,6 +101,72 @@ public static function provideConfigs()
             ],
         ];
 
+        yield [
+            [
+                'dsn' => 'mysql+pdo:',
+                'connection' => [
+                    'dbname' => 'customDbName',
+                ],
+            ],
+            [
+                'connection' => [
+                    'dbname' => 'customDbName',
+                    'driver' => 'pdo_mysql',
+                    'host' => 'localhost',
+                    'port' => '3306',
+                    'user' => 'root',
+                    'password' => '',
+                ],
+                'table_name' => 'enqueue',
+                'polling_interval' => 1000,
+                'lazy' => true,
+            ],
+        ];
+
+        yield [
+            [
+                'dsn' => 'mysql+pdo:',
+                'connection' => [
+                    'dbname' => 'customDbName',
+                    'host' => 'host',
+                    'port' => '10000',
+                    'user' => 'user',
+                    'password' => 'pass',
+                ],
+            ],
+            [
+                'connection' => [
+                    'dbname' => 'customDbName',
+                    'host' => 'host',
+                    'port' => '10000',
+                    'user' => 'user',
+                    'password' => 'pass',
+                    'driver' => 'pdo_mysql',
+                ],
+                'table_name' => 'enqueue',
+                'polling_interval' => 1000,
+                'lazy' => true,
+            ],
+        ];
+
+        yield [
+            [
+                'dsn' => 'mysql+pdo://user:pass@host:10000/db',
+                'connection' => [
+                    'foo' => 'fooValue',
+                ],
+            ],
+            [
+                'connection' => [
+                    'foo' => 'fooValue',
+                    'url' => 'pdo_mysql://user:pass@host:10000/db',
+                ],
+                'table_name' => 'enqueue',
+                'polling_interval' => 1000,
+                'lazy' => true,
+            ],
+        ];
+
         yield [
             'mysql://user:pass@host:10000/db',
             [