How I can set a session in codeigniter 3 database?

问题:

I'm using the new version(3.0.0). of CodeIgniter and I have a new problem, my sessions doesn't work. I mean, the code in the controller is correct because there are not errors but, when I try to print a PHP variable in a view there is nothing.

I checked my table in the MySQL Server, and nothing, I don't now what is the problem. I put my code of config.php. (I don't understand a lot of things in this new version)

$config['sess_table_name']              = 'ci_sessions';
$config['sess_driver']              = 'database';
$config['sess_cookie_name']             = 'ci_session';
$config['sess_expiration']          = 7200;
$config['sess_save_path']               = NULL;
$config['sess_match_ip']                = FALSE;
$config['sess_time_to_update']      = 300;
$config['sess_regenerate_destroy']  = FALSE;

I have to add the first line to "make" sessions works, I don't know if that configuration is correct to make sessions in a database.

If somebody has the same problem, help me please :( . My Session class has not been edited.

回答1:

First of all CI3 session table and CI2 session table( Saving Session Data to a Database)structure is different

New session table structure

 CREATE TABLE IF NOT EXISTS `ci_sessions` (
    `id` varchar(40) NOT NULL,
    `ip_address` varchar(45) NOT NULL,
    `timestamp` int(10) unsigned DEFAULT 0 NOT NULL,
    `data` blob NOT NULL,
    PRIMARY KEY (id),
    KEY `ci_sessions_timestamp` (`timestamp`)
);

Second They support old configuration variables with new configuration but it is better to use new configuration

$config['sess_driver'] = 'database';
$config['sess_cookie_name'] = 'ci_sessions';
$config['sess_expiration'] = 7200;
$config['sess_save_path'] = 'ci_sessions';//its your table name name
$config['sess_match_ip'] = FALSE;
$config['sess_time_to_update'] = 300;

See more details at their docs

Few new feature(function) available for session library.

Remember Don't forget it to load via autoload.php or loading $this->load->library('session'); before use it.

回答2:

If you added the "first line" (i.e. sess_table_name) to make it work, that is because your sess_driver value is set to database. Take a look at the list of supported drivers and you will see that for file based sessions, it will default to that. In other words, if you remove these lines, it should work:

$config['sess_table_name']          = 'ci_sessions';
$config['sess_driver']              = 'database';