How to manage database errors

Hi, I'm using the below code to insert data and if anything is missing or failed to insert I get proper error MSGs (via session)

PHP Code:

if($db->insert($postData)){
 return redirect()->to('xxxxxx');
 } else{
 return redirect()->back()
 ->with('errors',(object)$db->errors())
 ->with('warning','Please validate the data')
 ->withInput();
 } 


But when rules are set on an attribute to be unique, CI just throw a system error as below

Code:

mysqli_sql_exception #1062
Duplicate entry '2222' for key 'barcode' search →

Code:

SYSTEMPATH\Database\MySQLi\Connection.php at line 295

288             $this->connID->next_result();
289             if ($res = $this->connID->store_result()) {
290                 $res->free();
291             }
292         }
293
294         try {
295             return $this->connID->query($this->prepQuery($sql), $this->resultMode);
296         } catch (mysqli_sql_exception $e) {
297             log_message('error', (string) $e);
298
299             if ($this->DBDebug) {
300                 throw new DatabaseException($e->getMessage(), $e->getCode(), $e);
301             }
302         }

How can I get the warnings via the session like the above.
Hope my situation is clear.

---

My Bad, I found the solution.

If anybody get this issue read this
https://www.codeigniter.com/user_guide/l...=is_unique