Attempt to debug Oracle

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

@@ -0,0 +1,47 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Doctrine\Tests\DBAL\Functional;
+
+use Doctrine\DBAL\Logging\SQLLogger;
+
+use function microtime;
+
+class LockModeSQLLogger implements SQLLogger
+{
+    /** @var int */
+    private $cid;
+
+    /** @var list<array{cid: int, time: float, sql: string}> */
+    private $queries = [];
+
+    public function __construct(int $cid)
+    {
+        $this->cid = $cid;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function startQuery($sql, ?array $params = null, ?array $types = null): void
+    {
+        $this->queries[] = [
+            'cid' => $this->cid,
+            'time' => microtime(true),
+            'sql' => $sql,
+        ];
+    }
+
+    public function stopQuery(): void
+    {
+    }
+
+    /**
+     * @return list<array{cid: int, time: float, sql: string}>
+     */
+    public function getQueries(): array
+    {
+        return $this->queries;
+    }
+}

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

@@ -13,6 +13,9 @@
 use Doctrine\Tests\DbalTestCase;
 use Doctrine\Tests\TestUtil;
 
+use function array_merge;
+use function usort;
+
 class LockModeTest extends DbalTestCase
 {
     /** @var Connection */
@@ -21,11 +24,20 @@ class LockModeTest extends DbalTestCase
     /** @var Connection */
     private $c2;
 
+    /** @var LockModeSQLLogger */
+    private $c1Logger;
+
+    /** @var LockModeSQLLogger */
+    private $c2Logger;
+
     public function setUp(): void
     {
         $this->c1 = TestUtil::getConnection();
         $this->c2 = TestUtil::getConnection();
 
+        $this->c1->getConfiguration()->setSQLLogger($this->c1Logger = new LockModeSQLLogger(1));
+        $this->c2->getConfiguration()->setSQLLogger($this->c2Logger = new LockModeSQLLogger(2));
+
         $table = new Table('users');
         $table->addColumn('id', 'integer');
 
@@ -48,10 +60,27 @@ public function tearDown(): void
 
         $this->c1->close();
         $this->c2->close();
+
+        $queries = array_merge(
+            $this->c1Logger->getQueries(),
+            $this->c2Logger->getQueries()
+        );
+
+        usort($queries, static function (array $a, array $b) {
+            return $a['time'] - $b['time'];
+        });
+
+        echo "\n";
+
+        foreach ($queries as $query) {
+            echo 'C' . $query['cid'] . ': ' . $query['sql'] . "\n";
+        }
     }
 
     public function testLockModeNoneDoesNotBreakTransactionIsolation(): void
     {
+        $this->c1->getConfiguration()->setSQLLogger();
+
         try {
             $this->c1->setTransactionIsolation(TransactionIsolationLevel::READ_COMMITTED);
             $this->c2->setTransactionIsolation(TransactionIsolationLevel::READ_COMMITTED);