How to Ensure the Success of CRUD Queries in CodeIgniter?

Detecting the Success of CRUD Queries in CodeIgniter

Problem:

Determining the success or failure of create, update, and delete queries in CodeIgniter can be challenging. Users may face situations where queries do not produce visible changes in the database or return unexpected results.

Solution:

1. Server-Side Data Transmission:

• Avoid passing user IDs or other sensitive data through the URL. Instead, use HTTP POST requests to securely transfer data to the server.
• For instance, in the delete controller method:

<code class="php">public function softDeleteUser(): void
{
    $userId = $this->input->post('user_id');
    // ... (code continues)
}</code>

2. Query Execution and Result Checking:

• Perform queries solely within the model to maintain code organization and consistency.

• Check query results at two points:

  • Verify if the query was executed successfully without any syntax errors.
  • Determine the number of affected rows to ensure that the query made intended changes.

<code class="php">public function update(int $userId, array $newData): int
{
    if ($this->db->update('user_tablename', $newData, ['user_id' => $userId])) {
        $affectedRows = $this->db->affected_rows();
        if ($affectedRows) {
            // ... (code continues)
        }
    }
    return $affectedRows;
}</code>

• If the affected row count is 0, the query either did not find the intended record or made no changes to its existing data.

3. Exceptions and Error Handling:

• In case of query failures (e.g., syntax errors), the CodeIgniter error log should provide more details for debugging and troubleshooting.
• Implement custom error handling mechanisms within your application to catch and report any runtime issues.

4. Additional Considerations:

• Avoid modifying primary key fields (e.g., user IDs) during updates.
• Consider using logical deletion flags (e.g., 'deleted' column) instead of physical deletions for maintaining soft-deleted records.
• Implement user authentication and authorization checks to restrict sensitive operations to privileged users.

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