Merge branch '6.0' into 6.1

* 6.0:
  [Cache] Split PdoAdapter to DoctrineDbalAdapter

Author: javiereguiluz

components/cache/adapters/pdo_doctrine_dbal_adapter.rst

@@ -7,16 +7,26 @@
 PDO & Doctrine DBAL Cache Adapter
 =================================
 
-This adapter stores the cache items in an SQL database. It requires a :phpclass:`PDO`,
-`Doctrine DBAL Connection`_, or `Data Source Name (DSN)`_ as its first parameter, and
-optionally a namespace, default cache lifetime, and options array as its second,
-third, and forth parameters::
+The PDO and Doctrine DBAL adapters store the cache items in a table of an SQL database.
+
+.. note::
+
+    These adapters implement :class:`Symfony\\Component\\Cache\\PruneableInterface`,
+    allowing for manual :ref:`pruning of expired cache entries <component-cache-cache-pool-prune>`
+    by calling the ``prune()`` method.
+
+Using PHP PDO
+-------------
+
+The :class:`Symfony\\Component\\Cache\\Adapter\\PdoAdapter` requires a :phpclass:`PDO`,
+or `Data Source Name (DSN)`_ as its first parameter. You can pass a namespace,
+default cache lifetime, and options array as the other optional arguments::
 
     use Symfony\Component\Cache\Adapter\PdoAdapter;
 
     $cache = new PdoAdapter(
 
-        // a PDO, a Doctrine DBAL connection or DSN for lazy connecting through PDO
+        // a PDO connection or DSN for lazy connecting through PDO
         $databaseConnectionOrDSN,
 
         // the string prefixed to the keys of the items stored in this cache
@@ -40,13 +50,43 @@ your code.
 .. tip::
 
     When passed a `Data Source Name (DSN)`_ string (instead of a database connection
-    class instance), the connection will be lazy-loaded when needed.
+    class instance), the connection will be lazy-loaded when needed. DBAL Connection
+    are lazy-loaded by default; some additional options may be necessary to detect
+    the database engine and version without opening the connection.
+
+Using Doctrine DBAL
+-------------------
+
+The :class:`Symfony\\Component\\Cache\\Adapter\\DoctrineDbalAdapter` requires a
+`Doctrine DBAL Connection`_, or `Doctrine DBAL URL`_ as its first parameter.
+You can pass a namespace, default cache lifetime, and options array as the other
+optional arguments::
+
+    use Symfony\Component\Cache\Adapter\DoctrineDbalAdapter;
+
+    $cache = new DoctrineDbalAdapter(
+
+        // a Doctrine DBAL connection or DBAL URL
+        $databaseConnectionOrURL,
+
+        // the string prefixed to the keys of the items stored in this cache
+        $namespace = '',
+
+        // the default lifetime (in seconds) for cache items that do not define their
+        // own lifetime, with a value 0 causing items to be stored indefinitely (i.e.
+        // until the database table is truncated or its rows are otherwise deleted)
+        $defaultLifetime = 0,
+
+        // an array of options for configuring the database table and connection
+        $options = []
+    );
 
 .. note::
 
-    This adapter implements :class:`Symfony\\Component\\Cache\\PruneableInterface`,
-    allowing for manual :ref:`pruning of expired cache entries <component-cache-cache-pool-prune>` by
-    calling its ``prune()`` method.
+    DBAL Connection are lazy-loaded by default; some additional options may be
+    necessary to detect the database engine and version without opening the
+    connection.
 
 .. _`Doctrine DBAL Connection`: https://github.com/doctrine/dbal/blob/master/src/Connection.php
+.. _`Doctrine DBAL URL`: https://www.doctrine-project.org/projects/doctrine-dbal/en/latest/reference/configuration.html#connecting-using-a-url
 .. _`Data Source Name (DSN)`: https://en.wikipedia.org/wiki/Data_source_name