Mark connection constructors internal

UPGRADE.md

@@ -19,9 +19,11 @@ The method is not used anywhere except for tests.
 
 The `ServerInfoAwareConnection::requiresQueryForServerVersion()` method has been deprecated as an implementation detail which is the same for almost all supported drivers.
 
-## Statement constructors are marked internal
+## Connection and Statement constructors are marked internal
 
-The driver and wrapper statement objects can be only created by the corresponding connection objects.
+1. Driver connection objects can be only created by the corresponding drivers.
+2. Wrapper connection objects can be only created by the driver manager.
+3. The driver and wrapper connection objects can be only created by the corresponding connection objects.
 
 ## The `PingableConnection` interface is deprecated
 

lib/Doctrine/DBAL/Connection.php

@@ -168,6 +168,8 @@ class Connection implements DriverConnection
     /**
      * Initializes a new instance of the Connection class.
      *
+     * @internal The connection can be only instantiated by the driver manager.
+     *
      * @param mixed[]            $params       The connection parameters.
      * @param Driver             $driver       The driver to use.
      * @param Configuration|null $config       The configuration, optional.

lib/Doctrine/DBAL/Connections/MasterSlaveConnection.php

@@ -20,6 +20,8 @@ class MasterSlaveConnection extends PrimaryReadReplicaConnection
     /**
      * Creates Primary Replica Connection.
      *
+     * @internal The connection can be only instantiated by the driver manager.
+     *
      * @param mixed[] $params
      *
      * @throws InvalidArgumentException

lib/Doctrine/DBAL/Connections/PrimaryReadReplicaConnection.php

@@ -90,6 +90,8 @@ class PrimaryReadReplicaConnection extends Connection
     /**
      * Creates Primary Replica Connection.
      *
+     * @internal The connection can be only instantiated by the driver manager.
+     *
      * @param mixed[] $params
      *
      * @throws InvalidArgumentException

lib/Doctrine/DBAL/Driver/IBMDB2/DB2Connection.php

@@ -40,6 +40,8 @@ class DB2Connection implements ConnectionInterface, ServerInfoAwareConnection
     private $conn = null;
 
     /**
+     * @internal The connection can be only instantiated by its driver.
+     *
      * @param mixed[] $params
      * @param string  $username
      * @param string  $password

lib/Doctrine/DBAL/Driver/Mysqli/MysqliConnection.php

@@ -46,6 +46,8 @@ class MysqliConnection implements ConnectionInterface, PingableConnection, Serve
     private $conn;
 
     /**
+     * @internal The connection can be only instantiated by its driver.
+     *
      * @param mixed[] $params
      * @param string  $username
      * @param string  $password

lib/Doctrine/DBAL/Driver/OCI8/OCI8Connection.php

@@ -41,6 +41,8 @@ class OCI8Connection implements ConnectionInterface, ServerInfoAwareConnection
     /**
      * Creates a Connection to an Oracle Database using oci8 extension.
      *
+     * @internal The connection can be only instantiated by its driver.
+     *
      * @param string $username
      * @param string $password
      * @param string $db

lib/Doctrine/DBAL/Driver/PDOConnection.php

@@ -22,6 +22,8 @@ use function func_get_args;
 class PDOConnection extends PDO implements ConnectionInterface, ServerInfoAwareConnection
 {
     /**
+     * @internal The connection can be only instantiated by its driver.
+     *
      * @param string       $dsn
      * @param string|null  $user
      * @param string|null  $password

lib/Doctrine/DBAL/Driver/PDOSqlsrv/Connection.php

@@ -17,6 +17,8 @@ use function substr;
 class Connection extends BaseConnection
 {
     /**
+     * @internal The connection can be only instantiated by its driver.
+     *
      * {@inheritdoc}
      */
     public function __construct($dsn, $user = null, $password = null, ?array $options = null)

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

@@ -36,6 +36,8 @@ class SQLAnywhereConnection implements Connection, ServerInfoAwareConnection
     /**
      * Connects to database with given connection string.
      *
+     * @internal The connection can be only instantiated by its driver.
+     *
      * @param string $dsn        The connection string.
      * @param bool   $persistent Whether or not to establish a persistent connection.
      *

lib/Doctrine/DBAL/Driver/SQLSrv/SQLSrvConnection.php

@@ -39,6 +39,8 @@ class SQLSrvConnection implements ConnectionInterface, ServerInfoAwareConnection
     protected $lastInsertId;
 
     /**
+     * @internal The connection can be only instantiated by its driver.
+     *
      * @param string  $serverName
      * @param mixed[] $connectionOptions
      *

lib/Doctrine/DBAL/Sharding/PoolingShardConnection.php

@@ -65,6 +65,8 @@ class PoolingShardConnection extends Connection
     /**
      * {@inheritDoc}
      *
+     * @internal The connection can be only instantiated by the driver manager.
+     *
      * @throws InvalidArgumentException
      */
     public function __construct(array $params, Driver $driver, ?Configuration $config = null, ?EventManager $eventManager = null)