Database

Connection

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Active Record

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Error Handling

The examples in the user guide enable database debugging. In this mode, database errors are handled by CodeIgniter and error are displayed. Generally this is not what you want in a production site. To disable debuggin change the following line in config/database.php file:

 $db['default']['db_debug'] = TRUE;

to

 $db['default']['db_debug'] = FALSE;

After setting this, you can use the return value of database operation methods. Example:

if ($this->USER->insert($id, $name, $password) === FALSE) {
      $data['result'] = 'failed';
    } else {
      $data['result'] = 'successful';
}

See: http://codeigniter.com/forums/viewthread/49739/#243753