wrap driver connection exceptions

lib/Doctrine/DBAL/Driver/SQLAnywhere/Driver.php

@@ -36,7 +36,8 @@ class Driver implements \Doctrine\DBAL\Driver
     /**
      * {@inheritdoc}
      *
-     * @throws SQLAnywhereException
+     * @throws \Doctrine\DBAL\DBALException if there was a problem establishing the connection.
+     * @throws SQLAnywhereException         if a mandatory connection parameter is missing.
      */
     public function connect(array $params, $username = null, $password = null, array $driverOptions = array())
     {
@@ -52,6 +53,7 @@ class Driver implements \Doctrine\DBAL\Driver
             throw new SQLAnywhereException("Missing 'dbname' in configuration for sqlanywhere driver.");
         }
 
+        try {
             return new SQLAnywhereConnection(
                 $this->buildDsn(
                     $params['host'],
@@ -64,6 +66,9 @@ class Driver implements \Doctrine\DBAL\Driver
                 ),
                 isset($params['persistent']) ? $params['persistent'] : false
             );
+        } catch (SQLAnywhereException $e) {
+            throw DBALException::driverException($this, $e);
+        }
     }
 
     /**