Enforced parameter and return value types in Connection classes

UPGRADE.md

 # Upgrade to 3.0
 
+## BC BREAK: Changes in the `Doctrine\DBAL\Connection` API
+
+- The following methods have been removed as leaking internal implementation details: `::getHost()`, `::getPort()`, `::getUsername()`, `::getPassword()`.
+- The `::getDatabase()` method can now return null which means that no database is currently selected.
+
+## BC BREAK: Changes in `Doctrine\DBAL\Driver\SQLSrv\LastInsertId`
+
+- The class stores the last inserted ID as a nullable string, not an integer, which is reflected in the method signatures.
+
 ## BC BREAK: Changes in the `Doctrine\DBAL\Schema` API
 
 - Method `Doctrine\DBAL\Schema\AbstractSchemaManager::_getPortableViewDefinition()` no longer optionally returns false. It will always return a `Doctrine\DBAL\Schema\View` instance.

lib/Doctrine/DBAL/Connections/MasterSlaveConnection.php

@@ -67,14 +67,15 @@ use function count;
  *    )
  * ));
  *
- * You can also pass 'driverOptions' and any other documented option to each of this drivers to pass additional information.
+ * You can also pass 'driverOptions' and any other documented option to each of this drivers
+ * to pass additional information.
  */
 class MasterSlaveConnection extends Connection
 {
     /**
      * Master and slave connection (one of the randomly picked slaves).
      *
-     * @var DriverConnection[]|null[]
+     * @var array<string, DriverConnection|null>
      */
     protected $connections = ['master' => null, 'slave' => null];
 
@@ -89,12 +90,16 @@ class MasterSlaveConnection extends Connection
     /**
      * Creates Master Slave Connection.
      *
-     * @param mixed[] $params
+     * @param array<string, mixed> $params
      *
      * @throws InvalidArgumentException
      */
-    public function __construct(array $params, Driver $driver, ?Configuration $config = null, ?EventManager $eventManager = null)
-    {
+    public function __construct(
+        array $params,
+        Driver $driver,
+        ?Configuration $config = null,
+        ?EventManager $eventManager = null
+    ) {
         if (! isset($params['slaves'], $params['master'])) {
             throw new InvalidArgumentException('master or slaves configuration missing');
         }
@@ -114,10 +119,8 @@ class MasterSlaveConnection extends Connection
 
     /**
      * Checks if the connection is currently towards the master or not.
-     *
-     * @return bool
      */
-    public function isConnectedToMaster()
+    public function isConnectedToMaster() : bool
     {
         return $this->_conn !== null && $this->_conn === $this->connections['master'];
     }
@@ -179,12 +182,8 @@ class MasterSlaveConnection extends Connection
 
     /**
      * Connects to a specific connection.
-     *
-     * @param string $connectionName
-     *
-     * @return DriverConnection
      */
-    protected function connectTo($connectionName)
+    protected function connectTo(string $connectionName) : DriverConnection
     {
         $params = $this->getParams();
 
@@ -199,12 +198,11 @@ class MasterSlaveConnection extends Connection
     }
 
     /**
-     * @param string  $connectionName
-     * @param mixed[] $params
+     * @param array<string, mixed> $params
      *
-     * @return mixed
+     * @return array<string, mixed>
      */
-    protected function chooseConnectionConfiguration($connectionName, $params)
+    protected function chooseConnectionConfiguration(string $connectionName, array $params) : array
     {
         if ($connectionName === 'master') {
             return $params['master'];
@@ -262,17 +260,17 @@ class MasterSlaveConnection extends Connection
     /**
      * {@inheritDoc}
      */
-    public function delete($tableName, array $identifier, array $types = [])
+    public function delete(string $table, array $identifier, array $types = []) : int
     {
         $this->connect('master');
 
-        return parent::delete($tableName, $identifier, $types);
+        return parent::delete($table, $identifier, $types);
     }
 
     /**
      * {@inheritDoc}
      */
-    public function close()
+    public function close() : void
     {
         unset($this->connections['master'], $this->connections['slave']);
 
@@ -285,21 +283,21 @@ class MasterSlaveConnection extends Connection
     /**
      * {@inheritDoc}
      */
-    public function update($tableName, array $data, array $identifier, array $types = [])
+    public function update(string $table, array $data, array $identifier, array $types = []) : int
     {
         $this->connect('master');
 
-        return parent::update($tableName, $data, $identifier, $types);
+        return parent::update($table, $data, $identifier, $types);
     }
 
     /**
      * {@inheritDoc}
      */
-    public function insert($tableName, array $data, array $types = [])
+    public function insert(string $table, array $data, array $types = []) : int
     {
         $this->connect('master');
 
-        return parent::insert($tableName, $data, $types);
+        return parent::insert($table, $data, $types);
     }
 
     /**
@@ -315,7 +313,7 @@ class MasterSlaveConnection extends Connection
     /**
      * {@inheritDoc}
      */
-    public function createSavepoint($savepoint)
+    public function createSavepoint(string $savepoint) : void
     {
         $this->connect('master');
 
@@ -325,7 +323,7 @@ class MasterSlaveConnection extends Connection
     /**
      * {@inheritDoc}
      */
-    public function releaseSavepoint($savepoint)
+    public function releaseSavepoint(string $savepoint) : void
     {
         $this->connect('master');
 
@@ -335,7 +333,7 @@ class MasterSlaveConnection extends Connection
     /**
      * {@inheritDoc}
      */
-    public function rollbackSavepoint($savepoint)
+    public function rollbackSavepoint(string $savepoint) : void
     {
         $this->connect('master');
 

lib/Doctrine/DBAL/Driver.php

@@ -48,7 +48,7 @@ interface Driver
     /**
      * Gets the name of the database connected to for this driver.
      *
-     * @return string The name of the database or NULL if no database is currently selected.
+     * @return string|null The name of the database or NULL if no database is currently selected.
      */
     public function getDatabase(Connection $conn) : ?string;
 }

lib/Doctrine/DBAL/Driver/Connection.php

@@ -40,12 +40,8 @@ interface Connection
 
     /**
      * Returns the ID of the last inserted row or sequence value.
-     *
-     * @param string|null $name
-     *
-     * @return string
      */
-    public function lastInsertId($name = null);
+    public function lastInsertId(?string $name = null) : string;
 
     /**
      * Initiates a transaction.

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

@@ -29,18 +29,14 @@ class DB2Connection implements Connection, ServerInfoAwareConnection
     private $conn = null;
 
     /**
-     * @param mixed[] $params
-     * @param string  $username
-     * @param string  $password
-     * @param mixed[] $driverOptions
+     * @param array<string, mixed> $params
+     * @param array<string, mixed> $driverOptions
      *
      * @throws DB2Exception
      */
-    public function __construct(array $params, $username, $password, $driverOptions = [])
+    public function __construct(array $params, string $username, string $password, array $driverOptions = [])
     {
-        $isPersistent = (isset($params['persistent']) && $params['persistent'] === true);
-
-        if ($isPersistent) {
+        if (isset($params['persistent']) && $params['persistent'] === true) {
             $conn = db2_pconnect($params['dbname'], $username, $password, $driverOptions);
         } else {
             $conn = db2_connect($params['dbname'], $username, $password, $driverOptions);
@@ -56,7 +52,7 @@ class DB2Connection implements Connection, ServerInfoAwareConnection
     /**
      * {@inheritdoc}
      */
-    public function getServerVersion()
+    public function getServerVersion() : string
     {
         /** @var stdClass $serverInfo */
         $serverInfo = db2_server_info($this->conn);
@@ -67,7 +63,7 @@ class DB2Connection implements Connection, ServerInfoAwareConnection
     /**
      * {@inheritdoc}
      */
-    public function requiresQueryForServerVersion()
+    public function requiresQueryForServerVersion() : bool
     {
         return false;
     }
@@ -121,7 +117,7 @@ class DB2Connection implements Connection, ServerInfoAwareConnection
     /**
      * {@inheritdoc}
      */
-    public function lastInsertId($name = null)
+    public function lastInsertId(?string $name = null) : string
     {
         return db2_last_insert_id($this->conn);
     }

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

@@ -39,14 +39,12 @@ class MysqliConnection implements Connection, PingableConnection, ServerInfoAwar
     private $conn;
 
     /**
-     * @param mixed[] $params
-     * @param string  $username
-     * @param string  $password
-     * @param mixed[] $driverOptions
+     * @param array<string, mixed> $params
+     * @param array<int, mixed>    $driverOptions
      *
      * @throws MysqliException
      */
-    public function __construct(array $params, $username, $password, array $driverOptions = [])
+    public function __construct(array $params, string $username, string $password, array $driverOptions = [])
     {
         $port = $params['port'] ?? (int) ini_get('mysqli.default_port');
 
@@ -70,7 +68,8 @@ class MysqliConnection implements Connection, PingableConnection, ServerInfoAwar
         $this->setSecureConnection($params);
         $this->setDriverOptions($driverOptions);
 
-        set_error_handler(static function () {
+        set_error_handler(static function () : bool {
+            return true;
         });
         try {
             if (! $this->conn->real_connect($host, $username, $password, $dbname, $port, $socket, $flags)) {
@@ -91,10 +90,8 @@ class MysqliConnection implements Connection, PingableConnection, ServerInfoAwar
      * Retrieves mysqli native resource handle.
      *
      * Could be used if part of your application is not using DBAL.
-     *
-     * @return mysqli
      */
-    public function getWrappedResourceHandle()
+    public function getWrappedResourceHandle() : mysqli
     {
         return $this->conn;
     }
@@ -107,7 +104,7 @@ class MysqliConnection implements Connection, PingableConnection, ServerInfoAwar
      *
      * @link https://jira.mariadb.org/browse/MDEV-4088
      */
-    public function getServerVersion()
+    public function getServerVersion() : string
     {
         $serverInfos = $this->conn->get_server_info();
         if (stripos($serverInfos, 'mariadb') !== false) {
@@ -124,7 +121,7 @@ class MysqliConnection implements Connection, PingableConnection, ServerInfoAwar
     /**
      * {@inheritdoc}
      */
-    public function requiresQueryForServerVersion()
+    public function requiresQueryForServerVersion() : bool
     {
         return false;
     }
@@ -171,9 +168,9 @@ class MysqliConnection implements Connection, PingableConnection, ServerInfoAwar
     /**
      * {@inheritdoc}
      */
-    public function lastInsertId($name = null)
+    public function lastInsertId(?string $name = null) : string
     {
-        return $this->conn->insert_id;
+        return (string) $this->conn->insert_id;
     }
 
     /**
@@ -207,12 +204,12 @@ class MysqliConnection implements Connection, PingableConnection, ServerInfoAwar
     /**
      * Apply the driver options to the connection.
      *
-     * @param mixed[] $driverOptions
+     * @param array<int, mixed> $driverOptions
      *
      * @throws MysqliException When one of of the options is not supported.
      * @throws MysqliException When applying doesn't work - e.g. due to incorrect value.
      */
-    private function setDriverOptions(array $driverOptions = [])
+    private function setDriverOptions(array $driverOptions = []) : void
     {
         $supportedDriverOptions = [
             MYSQLI_OPT_CONNECT_TIMEOUT,
@@ -262,11 +259,11 @@ class MysqliConnection implements Connection, PingableConnection, ServerInfoAwar
     /**
      * Establish a secure connection
      *
-     * @param mixed[] $params
+     * @param array<string, mixed> $params
      *
      * @throws MysqliException
      */
-    private function setSecureConnection(array $params)
+    private function setSecureConnection(array $params) : void
     {
         if (! isset($params['ssl_key']) &&
             ! isset($params['ssl_cert']) &&

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

@@ -37,22 +37,15 @@ class OCI8Connection implements Connection, ServerInfoAwareConnection
     /**
      * Creates a Connection to an Oracle Database using oci8 extension.
      *
-     * @param string $username
-     * @param string $password
-     * @param string $db
-     * @param string $charset
-     * @param int    $sessionMode
-     * @param bool   $persistent
-     *
      * @throws OCI8Exception
      */
     public function __construct(
-        $username,
-        $password,
-        $db,
-        $charset = '',
-        $sessionMode = OCI_DEFAULT,
-        $persistent = false
+        string $username,
+        string $password,
+        string $db,
+        string $charset = '',
+        int $sessionMode = OCI_DEFAULT,
+        bool $persistent = false
     ) {
         $dbh = $persistent
             ? @oci_pconnect($username, $password, $db, $charset, $sessionMode)
@@ -71,7 +64,7 @@ class OCI8Connection implements Connection, ServerInfoAwareConnection
      * @throws UnexpectedValueException If the version string returned by the database server
      *                                  does not contain a parsable version number.
      */
-    public function getServerVersion()
+    public function getServerVersion() : string
     {
         $version = oci_server_version($this->dbh);
 
@@ -95,7 +88,7 @@ class OCI8Connection implements Connection, ServerInfoAwareConnection
     /**
      * {@inheritdoc}
      */
-    public function requiresQueryForServerVersion()
+    public function requiresQueryForServerVersion() : bool
     {
         return false;
     }
@@ -141,10 +134,10 @@ class OCI8Connection implements Connection, ServerInfoAwareConnection
     /**
      * {@inheritdoc}
      */
-    public function lastInsertId($name = null)
+    public function lastInsertId(?string $name = null) : string
     {
         if ($name === null) {
-            return false;
+            throw new OCI8Exception('The driver does not support identity columns.');
         }
 
         $sql    = 'SELECT ' . $name . '.CURRVAL FROM DUAL';
@@ -155,15 +148,13 @@ class OCI8Connection implements Connection, ServerInfoAwareConnection
             throw new OCI8Exception('lastInsertId failed: Query was executed but no result was returned.');
         }
 
-        return (int) $result;
+        return $result;
     }
 
     /**
      * Returns the current execution mode.
-     *
-     * @return int
      */
-    public function getExecuteMode()
+    public function getExecuteMode() : int
     {
         return $this->executeMode;
     }

lib/Doctrine/DBAL/Driver/PDOConnection.php

@@ -18,17 +18,14 @@ class PDOConnection implements Connection, ServerInfoAwareConnection
     private $connection;
 
     /**
-     * @param string       $dsn
-     * @param string|null  $user
-     * @param string|null  $password
-     * @param mixed[]|null $options
+     * @param array<int, mixed> $options
      *
      * @throws PDOException In case of an error.
      */
-    public function __construct($dsn, $user = null, $password = null, ?array $options = null)
+    public function __construct(string $dsn, string $username = '', string $password = '', array $options = [])
     {
         try {
-            $this->connection = new PDO($dsn, (string) $user, (string) $password, (array) $options);
+            $this->connection = new PDO($dsn, $username, $password, $options);
             $this->connection->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
         } catch (\PDOException $exception) {
             throw new PDOException($exception);
@@ -50,7 +47,7 @@ class PDOConnection implements Connection, ServerInfoAwareConnection
     /**
      * {@inheritdoc}
      */
-    public function getServerVersion()
+    public function getServerVersion() : string
     {
         return $this->connection->getAttribute(PDO::ATTR_SERVER_VERSION);
     }
@@ -95,7 +92,7 @@ class PDOConnection implements Connection, ServerInfoAwareConnection
     /**
      * {@inheritdoc}
      */
-    public function lastInsertId($name = null)
+    public function lastInsertId(?string $name = null) : string
     {
         try {
             if ($name === null) {
@@ -111,7 +108,7 @@ class PDOConnection implements Connection, ServerInfoAwareConnection
     /**
      * {@inheritdoc}
      */
-    public function requiresQueryForServerVersion()
+    public function requiresQueryForServerVersion() : bool
     {
         return false;
     }

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

@@ -17,7 +17,7 @@ class Connection extends PDOConnection
     /**
      * {@inheritDoc}
      */
-    public function lastInsertId($name = null)
+    public function lastInsertId(?string $name = null) : string
     {
         if ($name === null) {
             return parent::lastInsertId($name);

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

@@ -37,7 +37,7 @@ class SQLAnywhereConnection implements Connection, ServerInfoAwareConnection
      *
      * @throws SQLAnywhereException
      */
-    public function __construct($dsn, $persistent = false)
+    public function __construct(string $dsn, bool $persistent = false)
     {
         $this->connection = $persistent ? @sasql_pconnect($dsn) : @sasql_connect($dsn);
 
@@ -97,7 +97,7 @@ class SQLAnywhereConnection implements Connection, ServerInfoAwareConnection
     /**
      * {@inheritdoc}
      */
-    public function getServerVersion()
+    public function getServerVersion() : string
     {
         $version = $this->query("SELECT PROPERTY('ProductVersion')")->fetchColumn();
 
@@ -109,7 +109,7 @@ class SQLAnywhereConnection implements Connection, ServerInfoAwareConnection
     /**
      * {@inheritdoc}
      */
-    public function lastInsertId($name = null)
+    public function lastInsertId(?string $name = null) : string
     {
         if ($name === null) {
             return sasql_insert_id($this->connection);
@@ -148,7 +148,7 @@ class SQLAnywhereConnection implements Connection, ServerInfoAwareConnection
     /**
      * {@inheritdoc}
      */
-    public function requiresQueryForServerVersion()
+    public function requiresQueryForServerVersion() : bool
     {
         return true;
     }

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

@@ -9,21 +9,15 @@ namespace Doctrine\DBAL\Driver\SQLSrv;
  */
 class LastInsertId
 {
-    /** @var int */
+    /** @var string|null */
     private $id;
 
-    /**
-     * @param int $id
-     */
-    public function setId($id)
+    public function setId(?string $id) : void
     {
         $this->id = $id;
     }
 
-    /**
-     * @return int
-     */
-    public function getId()
+    public function getId() : ?string
     {
         return $this->id;
     }

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

@@ -30,12 +30,11 @@ class SQLSrvConnection implements Connection, ServerInfoAwareConnection
     protected $lastInsertId;
 
     /**
-     * @param string  $serverName
-     * @param mixed[] $connectionOptions
+     * @param array<string, mixed> $connectionOptions
      *
      * @throws SQLSrvException
      */
-    public function __construct($serverName, $connectionOptions)
+    public function __construct(string $serverName, array $connectionOptions)
     {
         if (! sqlsrv_configure('WarningsReturnAsErrors', 0)) {
             throw SQLSrvException::fromSqlSrvErrors();
@@ -54,7 +53,7 @@ class SQLSrvConnection implements Connection, ServerInfoAwareConnection
     /**
      * {@inheritdoc}
      */
-    public function getServerVersion()
+    public function getServerVersion() : string
     {
         $serverInfo = sqlsrv_server_info($this->conn);
 
@@ -64,7 +63,7 @@ class SQLSrvConnection implements Connection, ServerInfoAwareConnection
     /**
      * {@inheritdoc}
      */
-    public function requiresQueryForServerVersion()
+    public function requiresQueryForServerVersion() : bool
     {
         return false;
     }
@@ -119,7 +118,7 @@ class SQLSrvConnection implements Connection, ServerInfoAwareConnection
     /**
      * {@inheritDoc}
      */
-    public function lastInsertId($name = null)
+    public function lastInsertId(?string $name = null) : string
     {
         if ($name !== null) {
             $stmt = $this->prepare('SELECT CONVERT(VARCHAR(MAX), current_value) FROM sys.sequences WHERE name = ?');

lib/Doctrine/DBAL/Driver/ServerInfoAwareConnection.php

@@ -11,15 +11,13 @@ interface ServerInfoAwareConnection
 {
     /**
      * Returns the version number of the database server connected to.
-     *
-     * @return string
      */
-    public function getServerVersion();
+    public function getServerVersion() : string;
 
     /**
      * Checks whether a query is required to retrieve the database server version.
      *
      * @return bool True if a query is required to retrieve the database server version, false otherwise.
      */
-    public function requiresQueryForServerVersion();
+    public function requiresQueryForServerVersion() : bool;
 }

lib/Doctrine/DBAL/Portability/Connection.php

@@ -82,18 +82,12 @@ class Connection extends \Doctrine\DBAL\Connection
         }
     }
 
-    /**
-     * @return int
-     */
-    public function getPortability()
+    public function getPortability() : int
     {
         return $this->portability;
     }
 
-    /**
-     * @return int
-     */
-    public function getFetchCase()
+    public function getFetchCase() : ?int
     {
         return $this->case;
     }

lib/Doctrine/DBAL/Schema/AbstractSchemaManager.php

@@ -957,7 +957,13 @@ abstract class AbstractSchemaManager
      */
     public function getSchemaSearchPaths() : array
     {
-        return [$this->_conn->getDatabase()];
+        $database = $this->_conn->getDatabase();
+
+        if ($database !== null) {
+            return [$database];
+        }
+
+        return [];
     }
 
     /**

lib/Doctrine/DBAL/Schema/DB2SchemaManager.php

@@ -8,9 +8,7 @@ use Doctrine\DBAL\Platforms\DB2Platform;
 use Doctrine\DBAL\Types\Type;
 use const CASE_LOWER;
 use function array_change_key_case;
-use function assert;
 use function is_resource;
-use function is_string;
 use function preg_match;
 use function str_replace;
 use function strpos;
@@ -30,12 +28,9 @@ class DB2SchemaManager extends AbstractSchemaManager
      */
     public function listTableNames() : array
     {
-        $username = $this->_conn->getUsername();
-        assert(is_string($username));
+        $sql = $this->_platform->getListTablesSQL() . ' AND CREATOR = CURRENT_USER';
 
-        $sql = $this->_platform->getListTablesSQL() . ' AND CREATOR = UPPER(?)';
-
-        $tables = $this->_conn->fetchAll($sql, [$username]);
+        $tables = $this->_conn->fetchAll($sql);
 
         return $this->filterAssetNames($this->_getPortableTablesList($tables));
     }

lib/Doctrine/DBAL/Sharding/PoolingShardConnection.php

@@ -53,13 +53,13 @@ use function sprintf;
  */
 class PoolingShardConnection extends Connection
 {
-    /** @var DriverConnection[] */
+    /** @var array<int, DriverConnection>|array<string, DriverConnection> */
     private $activeConnections = [];
 
     /** @var string|int|null */
     private $activeShardId;
 
-    /** @var mixed[] */
+    /** @var array<int, array<string, mixed>>|array<string, array<string, mixed>> */
     private $connectionParameters = [];
 
     /**
@@ -67,8 +67,12 @@ class PoolingShardConnection extends Connection
      *
      * @throws InvalidArgumentException
      */
-    public function __construct(array $params, Driver $driver, ?Configuration $config = null, ?EventManager $eventManager = null)
-    {
+    public function __construct(
+        array $params,
+        Driver $driver,
+        ?Configuration $config = null,
+        ?EventManager $eventManager = null
+    ) {
         if (! isset($params['global'], $params['shards'])) {
             throw new InvalidArgumentException('Connection Parameters require "global" and "shards" configurations.');
         }
@@ -119,51 +123,11 @@ class PoolingShardConnection extends Connection
     /**
      * {@inheritdoc}
      */
-    public function getParams()
+    public function getParams() : array
     {
         return $this->activeShardId ? $this->connectionParameters[$this->activeShardId] : $this->connectionParameters[0];
     }
 
-    /**
-     * {@inheritdoc}
-     */
-    public function getHost()
-    {
-        $params = $this->getParams();
-
-        return $params['host'] ?? parent::getHost();
-    }
-
-    /**
-     * {@inheritdoc}
-     */
-    public function getPort()
-    {
-        $params = $this->getParams();
-
-        return $params['port'] ?? parent::getPort();
-    }
-
-    /**
-     * {@inheritdoc}
-     */
-    public function getUsername()
-    {
-        $params = $this->getParams();
-
-        return $params['user'] ?? parent::getUsername();
-    }
-
-    /**
-     * {@inheritdoc}
-     */
-    public function getPassword()
-    {
-        $params = $this->getParams();
-
-        return $params['password'] ?? parent::getPassword();
-    }
-
     /**
      * Connects to a given shard.
      *
@@ -207,10 +171,8 @@ class PoolingShardConnection extends Connection
      * Connects to a specific connection.
      *
      * @param string|int $shardId
-     *
-     * @return \Doctrine\DBAL\Driver\Connection
      */
-    protected function connectTo($shardId)
+    protected function connectTo($shardId) : DriverConnection
     {
         $params = $this->getParams();
 
@@ -226,10 +188,8 @@ class PoolingShardConnection extends Connection
 
     /**
      * @param string|int|null $shardId
-     *
-     * @return bool
      */
-    public function isConnected($shardId = null)
+    public function isConnected($shardId = null) : bool
     {
         if ($shardId === null) {
             return $this->_conn !== null;
@@ -238,10 +198,7 @@ class PoolingShardConnection extends Connection
         return isset($this->activeConnections[$shardId]);
     }
 
-    /**
-     * @return void
-     */
-    public function close()
+    public function close() : void
     {
         $this->_conn             = null;
         $this->activeConnections = [];

tests/Doctrine/Tests/DBAL/ConnectionTest.php

@@ -38,13 +38,13 @@ class ConnectionTest extends DbalTestCase
     /** @var Connection */
     private $connection;
 
-    /** @var string[] */
+    /** @var array<string, mixed> */
     protected $params = [
         'driver' => 'pdo_mysql',
         'host' => 'localhost',
         'user' => 'root',
         'password' => 'password',
-        'port' => '1234',
+        'port' => 1234,
     ];
 
     protected function setUp() : void
@@ -114,26 +114,6 @@ class ConnectionTest extends DbalTestCase
         self::assertInstanceOf(Configuration::class, $config);
     }
 
-    public function testGetHost() : void
-    {
-        self::assertEquals('localhost', $this->connection->getHost());
-    }
-
-    public function testGetPort() : void
-    {
-        self::assertEquals('1234', $this->connection->getPort());
-    }
-
-    public function testGetUsername() : void
-    {
-        self::assertEquals('root', $this->connection->getUsername());
-    }
-
-    public function testGetPassword() : void
-    {
-        self::assertEquals('password', $this->connection->getPassword());
-    }
-
     public function testGetDriver() : void
     {
         self::assertInstanceOf(\Doctrine\DBAL\Driver\PDOMySql\Driver::class, $this->connection->getDriver());

tests/Doctrine/Tests/DBAL/Functional/Driver/OCI8/OCI8ConnectionTest.php

@@ -49,6 +49,6 @@ class OCI8ConnectionTest extends DbalFunctionalTestCase
         $schema   = $this->connection->getDatabase();
         $sequence = $platform->getIdentitySequenceName($schema . '.DBAL2595', 'id');
 
-        self::assertSame(1, $this->driverConnection->lastInsertId($sequence));
+        self::assertEquals(1, $this->driverConnection->lastInsertId($sequence));
     }
 }

tests/Doctrine/Tests/DBAL/Functional/Schema/OracleSchemaManagerTest.php

@@ -237,7 +237,7 @@ class OracleSchemaManagerTest extends SchemaManagerFunctionalTestCase
         $otherTable->addColumn('id', Types::STRING);
         TestUtil::getTempConnection()->getSchemaManager()->dropAndCreateTable($otherTable);
 
-        $columns = $this->schemaManager->listTableColumns($table->getName(), $this->connection->getUsername());
+        $columns = $this->schemaManager->listTableColumns($table->getName(), $this->connection->getDatabase());
         self::assertCount(7, $columns);
     }
 

tests/Doctrine/Tests/DBAL/Functional/WriteTest.php

@@ -190,7 +190,8 @@ class WriteTest extends DbalFunctionalTestCase
             $this->markTestSkipped("Test only works consistently on platforms that support sequences and don't support identity columns.");
         }
 
-        self::assertFalse($this->lastInsertId());
+        $this->expectException(DriverException::class);
+        $this->lastInsertId();
     }
 
     /**

tests/Doctrine/Tests/DBAL/Schema/DB2SchemaManagerTest.php

@@ -33,14 +33,10 @@ final class DB2SchemaManagerTest extends TestCase
         $platform     = $this->createMock(DB2Platform::class);
         $this->conn   = $this
             ->getMockBuilder(Connection::class)
-            ->onlyMethods(['fetchAll', 'getUsername'])
+            ->onlyMethods(['fetchAll'])
             ->setConstructorArgs([['platform' => $platform], $driverMock, new Configuration(), $eventManager])
             ->getMock();
 
-        $this->conn->expects($this->any())
-            ->method('getUsername')
-            ->willReturn('db2inst1');
-
         $this->manager = new DB2SchemaManager($this->conn);
     }
 

tests/Doctrine/Tests/DBAL/Sharding/PoolingShardConnectionTest.php

@@ -243,80 +243,4 @@ class PoolingShardConnectionTest extends TestCase
             'host' => 'foo',
         ], $conn->getParams());
     }
-
-    public function testGetHostOverride() : void
-    {
-        $conn = DriverManager::getConnection([
-            'wrapperClass' => PoolingShardConnection::class,
-            'driver' => 'pdo_sqlite',
-            'host' => 'localhost',
-            'global' => ['memory' => true],
-            'shards' => [
-                ['id' => 1, 'memory' => true, 'host' => 'foo'],
-            ],
-            'shardChoser' => MultiTenantShardChoser::class,
-        ]);
-
-        self::assertEquals('localhost', $conn->getHost());
-
-        $conn->connect(1);
-        self::assertEquals('foo', $conn->getHost());
-    }
-
-    public function testGetPortOverride() : void
-    {
-        $conn = DriverManager::getConnection([
-            'wrapperClass' => PoolingShardConnection::class,
-            'driver' => 'pdo_sqlite',
-            'port' => 3306,
-            'global' => ['memory' => true],
-            'shards' => [
-                ['id' => 1, 'memory' => true, 'port' => 3307],
-            ],
-            'shardChoser' => MultiTenantShardChoser::class,
-        ]);
-
-        self::assertEquals(3306, $conn->getPort());
-
-        $conn->connect(1);
-        self::assertEquals(3307, $conn->getPort());
-    }
-
-    public function testGetUsernameOverride() : void
-    {
-        $conn = DriverManager::getConnection([
-            'wrapperClass' => PoolingShardConnection::class,
-            'driver' => 'pdo_sqlite',
-            'user' => 'foo',
-            'global' => ['memory' => true],
-            'shards' => [
-                ['id' => 1, 'memory' => true, 'user' => 'bar'],
-            ],
-            'shardChoser' => MultiTenantShardChoser::class,
-        ]);
-
-        self::assertEquals('foo', $conn->getUsername());
-
-        $conn->connect(1);
-        self::assertEquals('bar', $conn->getUsername());
-    }
-
-    public function testGetPasswordOverride() : void
-    {
-        $conn = DriverManager::getConnection([
-            'wrapperClass' => PoolingShardConnection::class,
-            'driver' => 'pdo_sqlite',
-            'password' => 'foo',
-            'global' => ['memory' => true],
-            'shards' => [
-                ['id' => 1, 'memory' => true, 'password' => 'bar'],
-            ],
-            'shardChoser' => MultiTenantShardChoser::class,
-        ]);
-
-        self::assertEquals('foo', $conn->getPassword());
-
-        $conn->connect(1);
-        self::assertEquals('bar', $conn->getPassword());
-    }
 }

tests/Doctrine/Tests/DBAL/Sharding/PoolingShardManagerTest.php

@@ -48,7 +48,14 @@ class PoolingShardManagerTest extends TestCase
     public function testSelectGlobal() : void
     {
         $conn = $this->createConnectionMock();
-        $conn->expects($this->once())->method('connect')->with($this->equalTo(0));
+        $conn->expects($this->at(0))
+            ->method('getParams')
+            ->will(
+                $this->returnValue([
+                    'shardChoser' => $this->createMock(ShardChoser::class),
+                ])
+            );
+        $conn->expects($this->at(1))->method('connect')->with($this->equalTo(0));
         $conn->method('getParams')
             ->willReturn([
                 'shardChoser' => $this->createMock(ShardChoser::class),