Fix final class member names according to the coding standard

phpstan.neon.dist

@@ -32,7 +32,7 @@ parameters:
             path: %currentWorkingDirectory%/tests/Functional/DataAccessTest.php
 
         # https://github.com/JetBrains/phpstorm-stubs/pull/766
-        - '~^Method Doctrine\\DBAL\\Driver\\Mysqli\\MysqliStatement::_fetch\(\) never returns null so it can be removed from the return typehint\.$~'
+        - '~^Method Doctrine\\DBAL\\Driver\\Mysqli\\MysqliStatement::fetch\(\) never returns null so it can be removed from the return typehint\.$~'
 
         # The ReflectionException in the case when the class does not exist is acceptable and does not need to be handled
         - '~^Parameter #1 \$argument of class ReflectionClass constructor expects class-string<T of object>\|T of object, string given\.$~'

src/Driver/Mysqli/MysqliStatement.php

@@ -301,7 +301,7 @@ final class MysqliStatement implements Statement
     /**
      * @return mixed[]|false|null
      */
-    private function _fetch()
+    private function fetch()
     {
         $ret = $this->stmt->fetch();
 
@@ -328,7 +328,7 @@ final class MysqliStatement implements Statement
             return false;
         }
 
-        $values = $this->_fetch();
+        $values = $this->fetch();
 
         if ($values === null) {
             return false;

src/Driver/OCI8/OCI8Connection.php

@@ -27,7 +27,7 @@ use const OCI_NO_AUTO_COMMIT;
 final class OCI8Connection implements Connection, ServerInfoAwareConnection
 {
     /** @var resource */
-    protected $dbh;
+    private $connection;
 
     /** @var ExecutionMode */
     private $executionMode;
@@ -45,15 +45,17 @@ final class OCI8Connection implements Connection, ServerInfoAwareConnection
         int $sessionMode = OCI_NO_AUTO_COMMIT,
         bool $persistent = false
     ) {
-        $dbh = $persistent
-            ? @oci_pconnect($username, $password, $db, $charset, $sessionMode)
-            : @oci_connect($username, $password, $db, $charset, $sessionMode);
+        if ($persistent) {
+            $connection = @oci_pconnect($username, $password, $db, $charset, $sessionMode);
+        } else {
+            $connection = @oci_connect($username, $password, $db, $charset, $sessionMode);
+        }
 
-        if ($dbh === false) {
+        if ($connection === false) {
             throw OCI8Exception::fromErrorInfo(oci_error());
         }
 
-        $this->dbh           = $dbh;
+        $this->connection    = $connection;
         $this->executionMode = new ExecutionMode();
     }
 
@@ -65,10 +67,10 @@ final class OCI8Connection implements Connection, ServerInfoAwareConnection
      */
     public function getServerVersion() : string
     {
-        $version = oci_server_version($this->dbh);
+        $version = oci_server_version($this->connection);
 
         if ($version === false) {
-            throw OCI8Exception::fromErrorInfo(oci_error($this->dbh));
+            throw OCI8Exception::fromErrorInfo(oci_error($this->connection));
         }
 
         if (preg_match('/\s+(\d+\.\d+\.\d+\.\d+\.\d+)\s+/', $version, $matches) === 0) {
@@ -86,7 +88,7 @@ final class OCI8Connection implements Connection, ServerInfoAwareConnection
 
     public function prepare(string $sql) : DriverStatement
     {
-        return new OCI8Statement($this->dbh, $sql, $this->executionMode);
+        return new OCI8Statement($this->connection, $sql, $this->executionMode);
     }
 
     public function query(string $sql) : ResultStatement
@@ -132,8 +134,8 @@ final class OCI8Connection implements Connection, ServerInfoAwareConnection
 
     public function commit() : void
     {
-        if (! oci_commit($this->dbh)) {
-            throw OCI8Exception::fromErrorInfo(oci_error($this->dbh));
+        if (! oci_commit($this->connection)) {
+            throw OCI8Exception::fromErrorInfo(oci_error($this->connection));
         }
 
         $this->executionMode->enableAutoCommit();
@@ -141,8 +143,8 @@ final class OCI8Connection implements Connection, ServerInfoAwareConnection
 
     public function rollBack() : void
     {
-        if (! oci_rollback($this->dbh)) {
-            throw OCI8Exception::fromErrorInfo(oci_error($this->dbh));
+        if (! oci_rollback($this->connection)) {
+            throw OCI8Exception::fromErrorInfo(oci_error($this->connection));
         }
 
         $this->executionMode->enableAutoCommit();

src/Driver/OCI8/OCI8Statement.php

@@ -41,16 +41,16 @@ use const SQLT_CHR;
 final class OCI8Statement implements Statement
 {
     /** @var resource */
-    protected $_dbh;
+    private $connection;
 
     /** @var resource */
-    protected $_sth;
+    private $statement;
 
     /** @var ExecutionMode */
-    protected $executionMode;
+    private $executionMode;
 
     /** @var string[] */
-    protected $_paramMap = [];
+    private $parameterMap = [];
 
     /**
      * Holds references to bound parameter values.
@@ -78,14 +78,14 @@ final class OCI8Statement implements Statement
      */
     public function __construct($dbh, string $query, ExecutionMode $executionMode)
     {
-        [$query, $paramMap] = (new ConvertPositionalToNamedPlaceholders())($query);
+        [$query, $parameterMap] = (new ConvertPositionalToNamedPlaceholders())($query);
 
-        $stmt = oci_parse($dbh, $query);
-        assert(is_resource($stmt));
+        $statement = oci_parse($dbh, $query);
+        assert(is_resource($statement));
 
-        $this->_sth          = $stmt;
-        $this->_dbh          = $dbh;
-        $this->_paramMap     = $paramMap;
+        $this->statement     = $statement;
+        $this->connection    = $dbh;
+        $this->parameterMap  = $parameterMap;
         $this->executionMode = $executionMode;
     }
 
@@ -103,15 +103,15 @@ final class OCI8Statement implements Statement
     public function bindParam($param, &$variable, int $type = ParameterType::STRING, ?int $length = null) : void
     {
         if (is_int($param)) {
-            if (! isset($this->_paramMap[$param])) {
+            if (! isset($this->parameterMap[$param])) {
                 throw new OCI8Exception(sprintf('Could not find variable mapping with index %d, in the SQL statement', $param));
             }
 
-            $param = $this->_paramMap[$param];
+            $param = $this->parameterMap[$param];
         }
 
         if ($type === ParameterType::LARGE_OBJECT) {
-            $lob = oci_new_descriptor($this->_dbh, OCI_D_LOB);
+            $lob = oci_new_descriptor($this->connection, OCI_D_LOB);
 
             $class = 'OCI-Lob';
             assert($lob instanceof $class);
@@ -124,13 +124,13 @@ final class OCI8Statement implements Statement
         $this->boundValues[$param] =& $variable;
 
         if (! oci_bind_by_name(
-            $this->_sth,
+            $this->statement,
             $param,
             $variable,
             $length ?? -1,
             $this->convertParameterType($type)
         )) {
-            throw OCI8Exception::fromErrorInfo(oci_error($this->_sth));
+            throw OCI8Exception::fromErrorInfo(oci_error($this->statement));
         }
     }
 
@@ -158,14 +158,14 @@ final class OCI8Statement implements Statement
             return;
         }
 
-        oci_cancel($this->_sth);
+        oci_cancel($this->statement);
 
         $this->result = false;
     }
 
     public function columnCount() : int
     {
-        $count = oci_num_fields($this->_sth);
+        $count = oci_num_fields($this->statement);
 
         if ($count !== false) {
             return $count;
@@ -197,9 +197,9 @@ final class OCI8Statement implements Statement
             $mode = OCI_NO_AUTO_COMMIT;
         }
 
-        $ret = @oci_execute($this->_sth, $mode);
+        $ret = @oci_execute($this->statement, $mode);
         if (! $ret) {
-            throw OCI8Exception::fromErrorInfo(oci_error($this->_sth));
+            throw OCI8Exception::fromErrorInfo(oci_error($this->statement));
         }
 
         $this->result = true;
@@ -207,7 +207,7 @@ final class OCI8Statement implements Statement
 
     public function rowCount() : int
     {
-        $count = oci_num_rows($this->_sth);
+        $count = oci_num_rows($this->statement);
 
         if ($count !== false) {
             return $count;
@@ -276,7 +276,7 @@ final class OCI8Statement implements Statement
         }
 
         return oci_fetch_array(
-            $this->_sth,
+            $this->statement,
             $mode | OCI_RETURN_NULLS | OCI_RETURN_LOBS
         );
     }
@@ -293,7 +293,7 @@ final class OCI8Statement implements Statement
         }
 
         oci_fetch_all(
-            $this->_sth,
+            $this->statement,
             $result,
             0,
             -1,