Merge pull request #544 from facupanizza/master

ORACLE, (INSTANCE_NAME = XXXXX)

docs/en/reference/configuration.rst

@@ -193,6 +193,10 @@ pdo\_oci / oci8
    connection pooling.
 -  ``charset`` (string): The charset used when connecting to the
    database.
+-  ``instancename`` (string): Optional parameter, complete whether to
+   add the INSTANCE_NAME parameter in the connection. It is generally used
+   to connect to an Oracle RAC server to select the name of a particular instance.   
+
 
 pdo\_sqlsrv / sqlsrv
 ^^^^^^^^^^^^^^^^^^^^

lib/Doctrine/DBAL/Driver/AbstractOracleDriver.php

@@ -124,18 +124,23 @@ abstract class AbstractOracleDriver implements Driver, ExceptionConverterDriver
 
             $service = 'SID=' . $serviceName;
             $pooled  = '';
+            $instance = '';
 
             if (isset($params['service']) && $params['service'] == true) {
                 $service = 'SERVICE_NAME=' . $serviceName;
             }
             
+            if (isset($params['instancename']) && ! empty($params['instancename'])) {
+                $instance = '(INSTANCE_NAME = ' . $params['instancename'] . ')';
+            }
+
             if (isset($params['pooled']) && $params['pooled'] == true) {
                 $pooled = '(SERVER=POOLED)';
             }
 
             return '(DESCRIPTION=' .
                      '(ADDRESS=(PROTOCOL=TCP)(HOST=' . $params['host'] . ')(PORT=' . $params['port'] . '))' .
-                     '(CONNECT_DATA=(' . $service . ')' . $pooled . '))';
+                     '(CONNECT_DATA=(' . $service . ')' . $instance . $pooled . '))';
 
         }