Help me abount transaction (begin, commit, rollback) in cakephp 3 version

Hi,

I am coded from ref link - http://book.cakephp.org/3.0/en/orm/database-basics.html#using-transactions.
But my code is running perfectly. But data is not updated or inserted into database.

Below is my code (controller) -

$conn = ConnectionManager::get('default');

$conn->begin();
try {
   
    // here is my code //

    $conn->commit();
} catch(Exception $e) {
    // do exception handling
    $conn->rollback();
}       


When I used exit before commit line the database is updated and as well as insert values. But when the exit remove the rollback is working (I think).

Please help or guide me.

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