Lazy Transactions Example

code.php

<?php

public function controllerAction($param1, $param2) {
    $transactionStarted = false;
    try {
        $data = $this->modelCall($param1, $param2, $transactionStarted);
        if($transactionStarted) {
            $this->db->commit();
        }
    }
    catch(\Exception $e) {
        if($transactionStarted) {
            $this->db->rollBack();
        }
    }
    return $data;
}

public function modelCall($param1, $param2, &$transactionStarted) {
    $data = $this->repo->getSomeData();
    if($data == $somethingThatRequiresAChange) {
        if(!$transactionStarted) {
            $this->db->beginTransaction();
            $transactionStarted = true;
        }
        $this->doSomeWriteThing();
    }
    return $data;
}