Make classes final where applicable.

UPGRADE.md

@@ -44,6 +44,39 @@ If you are using any of the legacy versions, you have to upgrade to newer MariaD
 
 Table columns are no longer indexed by column name. Use the `name` attribute of the column instead.
 
+## BC BREAK: Classes made final
+
+- Class constant `SQLSrvStatement::LAST_INSERT_ID_SQL` was changed from public to private.
+- Class `Doctrine\DBAL\Sharding\ShardChoser\MultiTenantShardChoser` was made final.
+- Class `Doctrine\DBAL\Sharding\SQLAzure\Schema\MultiTenantVisitor` was made final.
+- Class `Doctrine\DBAL\Sharding\SQLAzure\SQLAzureFederationsSynchronizer` was made final.
+- Class `Doctrine\DBAL\Sharding\PoolingShardManager` was made final.
+- Class `Doctrine\DBAL\Id\TableGeneratorSchemaVisitor` was made final.
+- Class `Doctrine\DBAL\Driver\OCI8\Driver` was made final.
+- Class `Doctrine\DBAL\Driver\Mysqli\Driver` was made final.
+- Class `Doctrine\DBAL\Driver\Mysqli\MysqliStatement` was made final.
+- Class `Doctrine\DBAL\Driver\PDOSqlsrv\Driver` was made final.
+- Class `Doctrine\DBAL\Driver\PDOSqlsrv\Statement` was made final.
+- Class `Doctrine\DBAL\Driver\PDOMySql\Driver` was made final.
+- Class `Doctrine\DBAL\Driver\IBMDB2\DB2Connection` was made final.
+- Class `Doctrine\DBAL\Driver\IBMDB2\DB2Statement` was made final.
+- Class `Doctrine\DBAL\Driver\IBMDB2\DB2Driver` was made final.
+- Class `Doctrine\DBAL\Driver\SQLSrv\SQLSrvStatement` was made final.
+- Class `Doctrine\DBAL\Driver\SQLSrv\Driver` was made final.
+- Class `Doctrine\DBAL\Driver\SQLSrv\SQLSrvConnection` was made final.
+- Class `Doctrine\DBAL\Driver\SQLAnywhere\SQLAnywhereConnection` was made final.
+- Class `Doctrine\DBAL\Driver\SQLAnywhere\Driver` was made final.
+- Class `Doctrine\DBAL\Driver\SQLAnywhere\SQLAnywhereStatement` was made final.
+- Class `Doctrine\DBAL\Driver\PDOPgSql\Driver` was made final.
+- Class `Doctrine\DBAL\Driver\PDOOracle\Driver` was made final.
+- Class `Doctrine\DBAL\Driver\PDOSqlite\Driver` was made final.
+- Class `Doctrine\DBAL\Driver\StatementIterator` was made final.
+- Class `Doctrine\DBAL\Cache\ResultCacheStatement` was made final.
+- Class `Doctrine\DBAL\Cache\ArrayStatement` was made final.
+- Class `Doctrine\DBAL\Schema\Synchronizer\SingleDatabaseSynchronizer` was made final.
+- Class `Doctrine\DBAL\Schema\Visitor\RemoveNamespacedAssets` was made final.
+- Class `Doctrine\DBAL\Portability\Statement` was made final.
+
 ## BC BREAK: Changes in the `Doctrine\DBAL\Schema` API
 
 - Column precision no longer defaults to 10. The default value is NULL.

lib/Doctrine/DBAL/Cache/ArrayStatement.php

@@ -17,7 +17,7 @@ use function count;
 use function reset;
 use function sprintf;
 
-class ArrayStatement implements IteratorAggregate, ResultStatement
+final class ArrayStatement implements IteratorAggregate, ResultStatement
 {
     /** @var mixed[] */
     private $data;

lib/Doctrine/DBAL/Cache/ResultCacheStatement.php

@@ -30,7 +30,7 @@ use function reset;
  * Also you have to realize that the cache will load the whole result into memory at once to ensure 2.
  * This means that the memory usage for cached results might increase by using this feature.
  */
-class ResultCacheStatement implements IteratorAggregate, ResultStatement
+final class ResultCacheStatement implements IteratorAggregate, ResultStatement
 {
     /** @var Cache */
     private $resultCache;

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

@@ -22,10 +22,10 @@ use function db2_prepare;
 use function db2_rollback;
 use function db2_server_info;
 
-class DB2Connection implements ServerInfoAwareConnection
+final class DB2Connection implements ServerInfoAwareConnection
 {
     /** @var resource */
-    private $conn = null;
+    private $conn;
 
     /**
      * @param array<string, mixed> $params

lib/Doctrine/DBAL/Driver/IBMDB2/DB2Driver.php

@@ -14,7 +14,7 @@ use function sprintf;
 /**
  * IBM DB2 Driver.
  */
-class DB2Driver extends AbstractDB2Driver
+final class DB2Driver extends AbstractDB2Driver
 {
     /**
      * {@inheritdoc}

lib/Doctrine/DBAL/Driver/IBMDB2/DB2Statement.php

@@ -48,7 +48,7 @@ use function stream_get_meta_data;
 use function strtolower;
 use function tmpfile;
 
-class DB2Statement implements IteratorAggregate, Statement
+final class DB2Statement implements IteratorAggregate, Statement
 {
     /** @var resource */
     private $stmt;
@@ -128,21 +128,6 @@ class DB2Statement implements IteratorAggregate, Statement
         }
     }
 
-    /**
-     * @param int   $position Parameter position
-     * @param mixed $variable
-     *
-     * @throws DB2Exception
-     */
-    private function bind(int $position, &$variable, int $parameterType, int $dataType) : void
-    {
-        $this->bindParam[$position] =& $variable;
-
-        if (! db2_bind_param($this->stmt, $position, 'variable', $parameterType, $dataType)) {
-            throw DB2Exception::fromStatementError($this->stmt);
-        }
-    }
-
     /**
      * {@inheritdoc}
      */
@@ -336,6 +321,21 @@ class DB2Statement implements IteratorAggregate, Statement
         return @db2_num_rows($this->stmt) ? : 0;
     }
 
+    /**
+     * @param int   $position Parameter position
+     * @param mixed $variable
+     *
+     * @throws DB2Exception
+     */
+    private function bind(int $position, &$variable, int $parameterType, int $dataType) : void
+    {
+        $this->bindParam[$position] =& $variable;
+
+        if (! db2_bind_param($this->stmt, $position, 'variable', $parameterType, $dataType)) {
+            throw DB2Exception::fromStatementError($this->stmt);
+        }
+    }
+
     /**
      * Casts a stdClass object to the given class name mapping its' properties.
      *

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

@@ -8,7 +8,7 @@ use Doctrine\DBAL\DBALException;
 use Doctrine\DBAL\Driver\AbstractMySQLDriver;
 use Doctrine\DBAL\Driver\Connection;
 
-class Driver extends AbstractMySQLDriver
+final class Driver extends AbstractMySQLDriver
 {
     /**
      * {@inheritdoc}

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

@@ -12,7 +12,7 @@ use const OCI_DEFAULT;
 /**
  * A Doctrine DBAL driver for the Oracle OCI8 PHP extensions.
  */
-class Driver extends AbstractOracleDriver
+final class Driver extends AbstractOracleDriver
 {
     /**
      * {@inheritdoc}
@@ -27,7 +27,7 @@ class Driver extends AbstractOracleDriver
             return new OCI8Connection(
                 $username,
                 $password,
-                $this->_constructDsn($params),
+                $this->constructDsn($params),
                 $params['charset'] ?? '',
                 $params['sessionMode'] ?? OCI_DEFAULT,
                 $params['persistent'] ?? false
@@ -44,7 +44,7 @@ class Driver extends AbstractOracleDriver
      *
      * @return string The DSN.
      */
-    protected function _constructDsn(array $params) : string
+    private function constructDsn(array $params) : string
     {
         return $this->getEasyConnectString($params);
     }

lib/Doctrine/DBAL/Driver/PDOMySql/Driver.php

@@ -14,7 +14,7 @@ use PDO;
 /**
  * PDO MySql driver.
  */
-class Driver extends AbstractMySQLDriver
+final class Driver extends AbstractMySQLDriver
 {
     /**
      * {@inheritdoc}
@@ -50,7 +50,7 @@ class Driver extends AbstractMySQLDriver
      *
      * @return string The DSN.
      */
-    protected function constructPdoDsn(array $params) : string
+    private function constructPdoDsn(array $params) : string
     {
         $dsn = 'mysql:';
         if (isset($params['host']) && $params['host'] !== '') {

lib/Doctrine/DBAL/Driver/PDOOracle/Driver.php

@@ -19,7 +19,7 @@ use PDO;
  * which leads us to the recommendation to use the "oci8" driver to connect
  * to Oracle instead.
  */
-class Driver extends AbstractOracleDriver
+final class Driver extends AbstractOracleDriver
 {
     /**
      * {@inheritdoc}

lib/Doctrine/DBAL/Driver/PDOPgSql/Driver.php

@@ -15,7 +15,7 @@ use function defined;
 /**
  * Driver that connects through pdo_pgsql.
  */
-class Driver extends AbstractPostgreSQLDriver
+final class Driver extends AbstractPostgreSQLDriver
 {
     /**
      * {@inheritdoc}
@@ -32,7 +32,7 @@ class Driver extends AbstractPostgreSQLDriver
 
         try {
             $connection = new PDOConnection(
-                $this->_constructPdoDsn($params),
+                $this->constructPdoDsn($params),
                 $username,
                 $password,
                 $driverOptions
@@ -67,7 +67,7 @@ class Driver extends AbstractPostgreSQLDriver
      *
      * @return string The DSN.
      */
-    private function _constructPdoDsn(array $params) : string
+    private function constructPdoDsn(array $params) : string
     {
         $dsn = 'pgsql:';
 

lib/Doctrine/DBAL/Driver/PDOSqlite/Driver.php

@@ -15,10 +15,10 @@ use function array_merge;
 /**
  * The PDO Sqlite driver.
  */
-class Driver extends AbstractSQLiteDriver
+final class Driver extends AbstractSQLiteDriver
 {
     /** @var mixed[] */
-    protected $_userDefinedFunctions = [
+    private $userDefinedFunctions = [
         'sqrt' => ['callback' => [SqlitePlatform::class, 'udfSqrt'], 'numArgs' => 1],
         'mod'  => ['callback' => [SqlitePlatform::class, 'udfMod'], 'numArgs' => 2],
         'locate'  => ['callback' => [SqlitePlatform::class, 'udfLocate'], 'numArgs' => -1],
@@ -34,8 +34,8 @@ class Driver extends AbstractSQLiteDriver
         array $driverOptions = []
     ) : Connection {
         if (isset($driverOptions['userDefinedFunctions'])) {
-            $this->_userDefinedFunctions = array_merge(
-                $this->_userDefinedFunctions,
+            $this->userDefinedFunctions = array_merge(
+                $this->userDefinedFunctions,
                 $driverOptions['userDefinedFunctions']
             );
             unset($driverOptions['userDefinedFunctions']);
@@ -43,7 +43,7 @@ class Driver extends AbstractSQLiteDriver
 
         try {
             $connection = new PDOConnection(
-                $this->_constructPdoDsn($params),
+                $this->constructPdoDsn($params),
                 $username,
                 $password,
                 $driverOptions
@@ -54,7 +54,7 @@ class Driver extends AbstractSQLiteDriver
 
         $pdo = $connection->getWrappedConnection();
 
-        foreach ($this->_userDefinedFunctions as $fn => $data) {
+        foreach ($this->userDefinedFunctions as $fn => $data) {
             $pdo->sqliteCreateFunction($fn, $data['callback'], $data['numArgs']);
         }
 
@@ -68,7 +68,7 @@ class Driver extends AbstractSQLiteDriver
      *
      * @return string The DSN.
      */
-    protected function _constructPdoDsn(array $params) : string
+    private function constructPdoDsn(array $params) : string
     {
         $dsn = 'sqlite:';
         if (isset($params['path'])) {

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

@@ -13,7 +13,7 @@ use function sprintf;
 /**
  * The PDO-based Sqlsrv driver.
  */
-class Driver extends AbstractSQLServerDriver
+final class Driver extends AbstractSQLServerDriver
 {
     /**
      * {@inheritdoc}
@@ -39,7 +39,7 @@ class Driver extends AbstractSQLServerDriver
         }
 
         return new Connection(
-            $this->_constructPdoDsn($params, $dsnOptions),
+            $this->constructPdoDsn($params, $dsnOptions),
             $username,
             $password,
             $pdoOptions
@@ -54,7 +54,7 @@ class Driver extends AbstractSQLServerDriver
      *
      * @return string The DSN.
      */
-    private function _constructPdoDsn(array $params, array $connectionOptions) : string
+    private function constructPdoDsn(array $params, array $connectionOptions) : string
     {
         $dsn = 'sqlsrv:server=';
 

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

@@ -11,7 +11,7 @@ use PDO;
 /**
  * PDO SQL Server Statement
  */
-class Statement extends PDOStatement
+final class Statement extends PDOStatement
 {
     /**
      * {@inheritdoc}

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

@@ -16,7 +16,7 @@ use function sprintf;
 /**
  * A Doctrine DBAL driver for the SAP Sybase SQL Anywhere PHP extension.
  */
-class Driver extends AbstractSQLAnywhereDriver
+final class Driver extends AbstractSQLAnywhereDriver
 {
     /**
      * {@inheritdoc}

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

@@ -23,7 +23,7 @@ use function sasql_set_option;
 /**
  * SAP Sybase SQL Anywhere implementation of the Connection interface.
  */
-class SQLAnywhereConnection implements ServerInfoAwareConnection
+final class SQLAnywhereConnection implements ServerInfoAwareConnection
 {
     /** @var resource The SQL Anywhere connection resource. */
     private $connection;

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

@@ -40,7 +40,7 @@ use function sprintf;
 /**
  * SAP SQL Anywhere implementation of the Statement interface.
  */
-class SQLAnywhereStatement implements IteratorAggregate, Statement
+final class SQLAnywhereStatement implements IteratorAggregate, Statement
 {
     /** @var resource The connection resource. */
     private $conn;

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

@@ -10,7 +10,7 @@ use Doctrine\DBAL\Driver\Connection;
 /**
  * Driver for ext/sqlsrv.
  */
-class Driver extends AbstractSQLServerDriver
+final class Driver extends AbstractSQLServerDriver
 {
     /**
      * {@inheritdoc}

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

@@ -20,13 +20,13 @@ use function str_replace;
 /**
  * SQL Server implementation for the Connection interface.
  */
-class SQLSrvConnection implements ServerInfoAwareConnection
+final class SQLSrvConnection implements ServerInfoAwareConnection
 {
     /** @var resource */
-    protected $conn;
+    private $conn;
 
     /** @var LastInsertId */
-    protected $lastInsertId;
+    private $lastInsertId;
 
     /**
      * @param array<string, mixed> $connectionOptions

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

@@ -37,7 +37,7 @@ use function stripos;
 /**
  * SQL Server Statement.
  */
-class SQLSrvStatement implements IteratorAggregate, Statement
+final class SQLSrvStatement implements IteratorAggregate, Statement
 {
     /**
      * The SQLSRV Resource.
@@ -232,51 +232,6 @@ class SQLSrvStatement implements IteratorAggregate, Statement
         $this->result = true;
     }
 
-    /**
-     * Prepares SQL Server statement resource
-     *
-     * @return resource
-     *
-     * @throws SQLSrvException
-     */
-    private function prepare()
-    {
-        $params = [];
-
-        foreach ($this->variables as $column => &$variable) {
-            switch ($this->types[$column]) {
-                case ParameterType::LARGE_OBJECT:
-                    $params[$column - 1] = [
-                        &$variable,
-                        SQLSRV_PARAM_IN,
-                        SQLSRV_PHPTYPE_STREAM(SQLSRV_ENC_BINARY),
-                        SQLSRV_SQLTYPE_VARBINARY('max'),
-                    ];
-                    break;
-
-                case ParameterType::BINARY:
-                    $params[$column - 1] = [
-                        &$variable,
-                        SQLSRV_PARAM_IN,
-                        SQLSRV_PHPTYPE_STRING(SQLSRV_ENC_BINARY),
-                    ];
-                    break;
-
-                default:
-                    $params[$column - 1] =& $variable;
-                    break;
-            }
-        }
-
-        $stmt = sqlsrv_prepare($this->conn, $this->sql, $params);
-
-        if (! $stmt) {
-            throw SQLSrvException::fromSqlSrvErrors();
-        }
-
-        return $stmt;
-    }
-
     /**
      * {@inheritdoc}
      */
@@ -399,4 +354,49 @@ class SQLSrvStatement implements IteratorAggregate, Statement
 
         return sqlsrv_rows_affected($this->stmt) ?: 0;
     }
+
+    /**
+     * Prepares SQL Server statement resource
+     *
+     * @return resource
+     *
+     * @throws SQLSrvException
+     */
+    private function prepare()
+    {
+        $params = [];
+
+        foreach ($this->variables as $column => &$variable) {
+            switch ($this->types[$column]) {
+                case ParameterType::LARGE_OBJECT:
+                    $params[$column - 1] = [
+                        &$variable,
+                        SQLSRV_PARAM_IN,
+                        SQLSRV_PHPTYPE_STREAM(SQLSRV_ENC_BINARY),
+                        SQLSRV_SQLTYPE_VARBINARY('max'),
+                    ];
+                    break;
+
+                case ParameterType::BINARY:
+                    $params[$column - 1] = [
+                        &$variable,
+                        SQLSRV_PARAM_IN,
+                        SQLSRV_PHPTYPE_STRING(SQLSRV_ENC_BINARY),
+                    ];
+                    break;
+
+                default:
+                    $params[$column - 1] =& $variable;
+                    break;
+            }
+        }
+
+        $stmt = sqlsrv_prepare($this->conn, $this->sql, $params);
+
+        if (! $stmt) {
+            throw SQLSrvException::fromSqlSrvErrors();
+        }
+
+        return $stmt;
+    }
 }

lib/Doctrine/DBAL/Driver/StatementIterator.php

@@ -6,7 +6,7 @@ namespace Doctrine\DBAL\Driver;
 
 use IteratorAggregate;
 
-class StatementIterator implements IteratorAggregate
+final class StatementIterator implements IteratorAggregate
 {
     /** @var ResultStatement */
     private $statement;

lib/Doctrine/DBAL/Id/TableGeneratorSchemaVisitor.php

@@ -12,7 +12,7 @@ use Doctrine\DBAL\Schema\Sequence;
 use Doctrine\DBAL\Schema\Table;
 use Doctrine\DBAL\Schema\Visitor\Visitor;
 
-class TableGeneratorSchemaVisitor implements Visitor
+final class TableGeneratorSchemaVisitor implements Visitor
 {
     /** @var string */
     private $generatorTableName;

lib/Doctrine/DBAL/Portability/Statement.php

@@ -18,7 +18,7 @@ use function rtrim;
 /**
  * Portability wrapper for a Statement.
  */
-class Statement implements IteratorAggregate, DriverStatement
+final class Statement implements IteratorAggregate, DriverStatement
 {
     /** @var int */
     private $portability;
@@ -164,34 +164,6 @@ class Statement implements IteratorAggregate, DriverStatement
         return $rows;
     }
 
-    /**
-     * @param mixed $row
-     *
-     * @return mixed
-     */
-    protected function fixRow($row, bool $iterateRow, bool $fixCase)
-    {
-        if (! $row) {
-            return $row;
-        }
-
-        if ($fixCase) {
-            $row = array_change_key_case($row, $this->case);
-        }
-
-        if ($iterateRow) {
-            foreach ($row as $k => $v) {
-                if (($this->portability & Connection::PORTABILITY_EMPTY_TO_NULL) && $v === '') {
-                    $row[$k] = null;
-                } elseif (($this->portability & Connection::PORTABILITY_RTRIM) && is_string($v)) {
-                    $row[$k] = rtrim($v);
-                }
-            }
-        }
-
-        return $row;
-    }
-
     /**
      * {@inheritdoc}
      */
@@ -219,4 +191,32 @@ class Statement implements IteratorAggregate, DriverStatement
 
         return $this->stmt->rowCount();
     }
+
+    /**
+     * @param mixed $row
+     *
+     * @return mixed
+     */
+    private function fixRow($row, bool $iterateRow, bool $fixCase)
+    {
+        if (! $row) {
+            return $row;
+        }
+
+        if ($fixCase) {
+            $row = array_change_key_case($row, $this->case);
+        }
+
+        if ($iterateRow) {
+            foreach ($row as $k => $v) {
+                if (($this->portability & Connection::PORTABILITY_EMPTY_TO_NULL) && $v === '') {
+                    $row[$k] = null;
+                } elseif (($this->portability & Connection::PORTABILITY_RTRIM) && is_string($v)) {
+                    $row[$k] = rtrim($v);
+                }
+            }
+        }
+
+        return $row;
+    }
 }

lib/Doctrine/DBAL/Schema/Synchronizer/SingleDatabaseSynchronizer.php

@@ -14,7 +14,7 @@ use function count;
 /**
  * Schema Synchronizer for Default DBAL Connection.
  */
-class SingleDatabaseSynchronizer extends AbstractSchemaSynchronizer
+final class SingleDatabaseSynchronizer extends AbstractSchemaSynchronizer
 {
     /** @var AbstractPlatform */
     private $platform;

lib/Doctrine/DBAL/Schema/Visitor/RemoveNamespacedAssets.php

@@ -20,7 +20,7 @@ use Doctrine\DBAL\Schema\Table;
  * This visitor filters all these non-default namespaced tables and sequences
  * and removes them from the SChema instance.
  */
-class RemoveNamespacedAssets extends AbstractVisitor
+final class RemoveNamespacedAssets extends AbstractVisitor
 {
     /** @var Schema */
     private $schema;

tests/Doctrine/Tests/DBAL/Driver/StatementIteratorTest.php

@@ -4,35 +4,14 @@ declare(strict_types=1);
 
 namespace Doctrine\Tests\DBAL\Driver;
 
-use Doctrine\DBAL\Driver\IBMDB2\DB2Statement;
-use Doctrine\DBAL\Driver\Mysqli\MysqliStatement;
-use Doctrine\DBAL\Driver\OCI8\OCI8Statement;
-use Doctrine\DBAL\Driver\SQLAnywhere\SQLAnywhereStatement;
-use Doctrine\DBAL\Driver\SQLSrv\SQLSrvStatement;
 use Doctrine\DBAL\Driver\Statement;
 use Doctrine\DBAL\Driver\StatementIterator;
-use Doctrine\DBAL\Portability\Statement as PortabilityStatement;
 use Doctrine\Tests\DbalTestCase;
-use IteratorAggregate;
 use PHPUnit\Framework\MockObject\MockObject;
-use function extension_loaded;
+use Traversable;
 
 class StatementIteratorTest extends DbalTestCase
 {
-    /**
-     * @dataProvider statementProvider()
-     */
-    public function testGettingIteratorDoesNotCallFetch(string $class) : void
-    {
-        /** @var IteratorAggregate|MockObject $stmt */
-        $stmt = $this->createPartialMock($class, ['fetch', 'fetchAll', 'fetchColumn']);
-        $stmt->expects($this->never())->method('fetch');
-        $stmt->expects($this->never())->method('fetchAll');
-        $stmt->expects($this->never())->method('fetchColumn');
-
-        $stmt->getIterator();
-    }
-
     public function testIteratorIterationCallsFetchOncePerStep() : void
     {
         $stmt = $this->createMock(Statement::class);
@@ -45,20 +24,6 @@ class StatementIteratorTest extends DbalTestCase
         $this->assertIterationCallsFetchOncePerStep($stmtIterator, $calls);
     }
 
-    /**
-     * @dataProvider statementProvider()
-     */
-    public function testStatementIterationCallsFetchOncePerStep(string $class) : void
-    {
-        /** @var iterable<int, mixed>|MockObject $stmt */
-        $stmt = $this->createPartialMock($class, ['fetch']);
-
-        $calls = 0;
-        $this->configureStatement($stmt, $calls);
-
-        $this->assertIterationCallsFetchOncePerStep($stmt, $calls);
-    }
-
     private function configureStatement(MockObject $stmt, int &$calls) : void
     {
         $values = ['foo', '', 'bar', '0', 'baz', 0, 'qux', null, 'quz', false, 'impossible'];
@@ -74,33 +39,7 @@ class StatementIteratorTest extends DbalTestCase
             });
     }
 
-    /**
-     * @return string[][]
-     */
-    public static function statementProvider() : iterable
-    {
-        if (extension_loaded('ibm_db2')) {
-            yield [DB2Statement::class];
-        }
-
-        yield [MysqliStatement::class];
-
-        if (extension_loaded('oci8')) {
-            yield [OCI8Statement::class];
-        }
-
-        yield [PortabilityStatement::class];
-        yield [SQLAnywhereStatement::class];
-
-        if (extension_loaded('sqlsrv')) {
-            yield [SQLSrvStatement::class];
-        }
-    }
-
-    /**
-     * @param iterable<int, mixed> $iterator
-     */
-    private function assertIterationCallsFetchOncePerStep(iterable $iterator, int &$calls) : void
+    private function assertIterationCallsFetchOncePerStep(Traversable $iterator, int &$calls) : void
     {
         foreach ($iterator as $i => $_) {
             $this->assertEquals($i + 1, $calls);