Accessing a database through codeigniter based on login - database

Question

I have a functionality as follows:
When Any user logs in I want to connect to a particular DB based on login credentials
.
I tried with
$this->db->close();
and this->db->reconnect();
but it did not help

Answer 1

In your application/config/database.php you can define more than one database connection by doing
$db['database1']['hostname'] = 'localhost';
$db['database1']['username'] = 'db1_root';
$db['database1']['password'] = 'xxxxxx';
$db['database1']['database'] = 'database1_name';
$db['database1']['db_debug'] = false; //Important
$db['database2']['hostname'] = 'localhost';
$db['database2']['username'] = 'db2_root';
$db['database2']['password'] = 'xxxxxx';
$db['database2']['database'] = 'database2_name';
$db['database2']['db_debug'] = false; //Important
Then you can load specific databases by doing
$database1 = $this->load->database('database1', true);
$database2 = $this->load->database('database2', true);
Then rather than doing
$this->db->query();
You will need to do either
$database1->query();
$database2->query();

Answer 2

You can connect using a dynamic config in your controller/model/library/whatever by passing a config array to $this->load->database().
$config['hostname'] = "localhost";
$config['username'] = $user_name;
$config['password'] = $user_password;
$config['database'] = $user_database;
$config['dbdriver'] = "mysql";
$config['dbprefix'] = "";
$config['pconnect'] = FALSE;
$config['db_debug'] = TRUE;
$config['cache_on'] = FALSE;
$config['cachedir'] = "";
$config['char_set'] = "utf8";
$config['dbcollat'] = "utf8_general_ci";
$user_db = $this->load->database($config, true);

Answer 3

I figured out my answer.. Coded as follows:
in the database.php file i have added a new database config:
$db['db2']=$db['default'];
$db['db2']['database'] = 'new_db2';
and then in all the models constructor function i have put the following code:
$new_db = $this->load->database('db2', TRUE );
$this->db = $new_db;
So in this case i don't need to change all my queries. Hurray!!! :)