fix retrieving the database name connected to for SQL Anywhere

lib/Doctrine/DBAL/Driver/AbstractSQLAnywhereDriver.php

@@ -116,7 +116,11 @@ abstract class AbstractSQLAnywhereDriver implements Driver, ExceptionConverterDr
     {
         $params = $conn->getParams();
 
-        return $params['dbname'];
+        if (isset($params['dbname'])) {
+            return $params['dbname'];
+        }
+
+        return $conn->query('SELECT DB_NAME()')->fetchColumn();
     }
 
     /**

tests/Doctrine/Tests/DBAL/Functional/Driver/SQLAnywhere/DriverTest.php

+<?php
+
+namespace Doctrine\Tests\DBAL\Functional\Driver\SQLAnywhere;
+
+use Doctrine\DBAL\Connection;
+use Doctrine\DBAL\Driver\SQLAnywhere\Driver;
+use Doctrine\Tests\DBAL\Functional\Driver\AbstractDriverTest;
+
+class DriverTest extends AbstractDriverTest
+{
+    protected function setUp()
+    {
+        if (! extension_loaded('sqlanywhere')) {
+            $this->markTestSkipped('sqlanywhere is not installed.');
+        }
+
+        parent::setUp();
+
+        if (! $this->_conn->getDriver() instanceof Driver) {
+            $this->markTestSkipped('sqlanywhere only test.');
+        }
+    }
+
+    public function testReturnsDatabaseNameWithoutDatabaseNameParameter()
+    {
+        $params = $this->_conn->getParams();
+        unset($params['dbname']);
+
+        $connection = new Connection(
+            $params,
+            $this->_conn->getDriver(),
+            $this->_conn->getConfiguration(),
+            $this->_conn->getEventManager()
+        );
+
+        // SQL Anywhere has no "default" database. The name of the default database
+        // is defined on server startup and therefore can be arbitrary.
+        $this->assertInternalType('string', $this->driver->getDatabase($connection));
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function createDriver()
+    {
+        return new Driver();
+    }
+}