问题
Codeigniter 2 to 3 version after upgrading, I get this error.. Why would that be?
An uncaught Exception was encountered
Type: Exception
Message: Configured database connection is persistent. Aborting.
Filename: /var/www/vhosts/xxx.com/app/system/libraries/Session/drivers/Session_database_driver.php
Line Number: 94
Backtrace:
File: /var/www/vhosts/xxx.com/app/application/core/MY_Controller.php Line: 11 Function: __construct
File: /var/www/vhosts/xxx.com/app/application/core/MY_Controller.php Line: 52 Function: __construct
File: /var/www/vhosts/xxx.com/app/application/controllers/Dashboard.php Line: 7 Function: __construct
File: /var/www/vhosts/xxx.com/application/index.php Line: 293 Function: require_once
回答1:
I had the same issue, and found that it was just a matter of changing a setting:
Modify your database.php config file and turn 'pconnect' to false. As part of the CI 3 Framework, it would be part of this array:
$db['default'] = array(
'pconnect' => FALSE // This value
);
Or if your config file looks more like the CI 2 version:
$db['default']['pconnect'] = FALSE;
A bit of searching seems to suggest that the database doesn't like a persistent connection, possible because of security reasons.
回答2:
Disable caching in database.php file, define caching folder in database.php by
'cachedir' => APPPATH.'cache/db/',
setting and only use
$this->db->cache_on();
command where you want your database query being cached.
Don't forget to use
$this->db->cache_off();
after select queries for unwanted cached results.
回答3:
It seems like codeigniter 3.0 doesn't support sessions using database, when persistent is enabled. form: http://www.codeigniter.com/user_guide/libraries/sessions.html?highlight=session#session-preferences
However, there are some conditions that must be met:
Only your default database connection (or the one that you access as $this->db from your controllers) can be used. You must have the Query Builder enabled. You can NOT use a persistent connection. You can NOT use a connection with the cache_on setting enabled.
回答4:
You need to ensure that FALSE goes out without quotes.If you use 'FALSE', the database driver will take that as a true boolean. The system expects you to use FALSE directly, without quotes. So, unset pconnect instead of using 'FALSE' in order to default to FALSE, or use FALSE as a value if you like to keep things ordered :)
* Persistent connection flag
*
* @var bool
*/
public $pconnect = FALSE;
来源：https://stackoverflow.com/questions/29446898/message-configured-database-connection-is-persistent-aborting