How to Ensure Transaction Rollback in CodeIgniter When Calling External Functions?

CodeIgniter Transactions

CodeIgniter transactions provide a mechanism to execute multiple database operations as part of a single transaction. This ensures that all operations are completed successfully or all are rolled back if an error occurs.

In your scenario, you are calling external functions within the transaction block, but if these functions encounter errors, the transaction will not be rolled back as desired. This is because your external functions do not have access to the transaction state.

One solution is to catch errors in your external functions and manually perform a rollback if necessary. For example:

<code class="php">try {
    $this->db->trans_start();
    $this->utils->insert_function($data);
    $this->utils->update_function2($test);
    $this->db->trans_complete();
} catch (Exception $e) {
    $this->db->trans_rollback();
}</code>

However, a more robust solution is to encapsulate your database operations within individual model methods. This allows for better organization and centralized error handling. In this case, you could move your insert_function and update_function2 functions into a model and handle transactions within the model methods:

TransactionExampleModel.php

<code class="php">class TransactionExampleModel extends CI_Model {
    public function insertData($data) {
        $this->db->trans_start();
        $this->db->insert('table_name', $data);
        if ($this->db->trans_status() === FALSE) {
            $this->db->trans_rollback();
            return FALSE;
        }
        $this->db->trans_commit();
        return TRUE;
    }

    public function updateData($data, $id) {
        $this->db->trans_start();
        $this->db->where('id', $id);
        $this->db->update('table_name', $data);
        if ($this->db->trans_status() === FALSE) {
            $this->db->trans_rollback();
            return FALSE;
        }
        $this->db->trans_commit();
        return TRUE;
    }
}</code>

Then, in your controller, you can call the model methods within the transaction block:

<code class="php">$this->load->model('TransactionExampleModel');

$this->db->trans_start();
$result1 = $this->TransactionExampleModel->insertData($data);
$result2 = $this->TransactionExampleModel->updateData($test, $id);
$this->db->trans_complete();</code>

This approach provides a more centralized and robust way to manage transactions in your CodeIgniter application.

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