fix: encapsulation violation in BasePreparedQuery class

system/Database/BaseConnection.php

@@ -652,9 +652,7 @@ public function query(string $sql, $binds = null, bool $setEscapeFlags = true, s
             $query->setDuration($startTime, $startTime);
 
             // This will trigger a rollback if transactions are being used
-            if ($this->transDepth !== 0) {
-                $this->transStatus = false;
-            }
+            $this->handleTransStatus();
 
             if (
                 $this->DBDebug
@@ -904,6 +902,18 @@ public function resetTransStatus(): static
         return $this;
     }
 
+    /**
+     * Handle transaction status when a query fails
+     *
+     * @internal This method is for internal database component use only
+     */
+    public function handleTransStatus(): void
+    {
+        if ($this->transDepth !== 0) {
+            $this->transStatus = false;
+        }
+    }
+
     /**
      * Begin Transaction
      */

system/Database/BasePreparedQuery.php

@@ -134,9 +134,7 @@ public function execute(...$data)
             $query->setDuration($startTime, $startTime);
 
             // This will trigger a rollback if transactions are being used
-            if ($this->db->transDepth !== 0) {
-                $this->db->transStatus = false;
-            }
+            $this->db->handleTransStatus();
 
             if ($this->db->DBDebug) {
                 // We call this function in order to roll-back queries

tests/system/Database/Live/PreparedQueryTest.php

@@ -304,4 +304,44 @@ public function testInsertBinaryData(): void
 
         $this->assertSame(strlen($fileContent), strlen($file));
     }
+
+    public function testHandleTransStatusMarksTransactionFailedDuringTransaction(): void
+    {
+        $this->db->transStart();
+
+        // Verify we're in a transaction
+        $this->assertSame(1, $this->db->transDepth);
+
+        // Prepare a query that will fail (duplicate key)
+        $this->query = $this->db->prepare(static fn ($db) => $db->table('without_auto_increment')->insert([
+            'key'   => 'a',
+            'value' => 'b',
+        ]));
+
+        $this->disableDBDebug();
+
+        $this->assertTrue($this->query->execute('test_key', 'test_value'));
+        $this->assertTrue($this->db->transStatus());
+
+        $this->seeInDatabase($this->db->DBPrefix . 'without_auto_increment', [
+            'key'   => 'test_key',
+            'value' => 'test_value'
+        ]);
+
+        $this->assertFalse($this->query->execute('test_key', 'different_value'));
+        $this->assertFalse($this->db->transStatus());
+
+        $this->enableDBDebug();
+
+        // Complete the transaction - should rollback due to failed status
+        $this->assertFalse($this->db->transComplete());
+
+        // Verify the first insert was rolled back
+        $this->dontSeeInDatabase($this->db->DBPrefix . 'without_auto_increment', [
+            'key'   => 'test_key',
+            'value' => 'test_value'
+        ]);
+
+        $this->db->resetTransStatus();
+    }
 }

user_guide_src/source/changelogs/v4.6.2.rst

@@ -37,6 +37,7 @@ Bugs Fixed
 
 - **Cache:** Fixed a bug where a corrupted or unreadable cache file could cause an unhandled exception in ``FileHandler::getItem()``.
 - **Database:** Fixed a bug where ``when()`` and ``whenNot()`` in ``ConditionalTrait`` incorrectly evaluated certain falsy values (such as ``[]``, ``0``, ``0.0``, and ``'0'``) as truthy, causing callbacks to be executed unexpectedly. These methods now cast the condition to a boolean using ``(bool)`` to ensure consistent behavior with PHP's native truthiness.
+- **Database:** Fixed encapsulation violation in ``BasePreparedQuery`` when accessing ``BaseConnection::transStatus`` protected property.
 - **Email:** Fixed a bug where ``Email::getHostname()`` failed to use ``$_SERVER['SERVER_ADDR']`` when ``$_SERVER['SERVER_NAME']`` was not set.
 - **Security:** Fixed a bug where the ``sanitize_filename()`` function from the Security helper would throw an error when used in CLI requests.
 - **Session:** Fixed a bug where using the ``DatabaseHandler`` with an unsupported database driver (such as ``SQLSRV``, ``OCI8``, or ``SQLite3``) did not throw an appropriate error.