Hai, when we learn about PHP specialy CI Framework on scholl we always introduce with mysql as database. now I will share my little knowledge. how to connect CI framework with postgresql lets open database.php at folder application/config/ //Connection to Postgre $db['default']['hostname'] = 'localhost'; $db['default']['username'] = 'postgres'; // Your User at Postgresql $db['default']['password'] = ''; // Your password at Postgresql $db['default']['database'] = 'datane'; // database postgresql $db['default']['dbdriver'] = 'postgre'; //db driver from default mysql or mysqli change to postgre $db['default']['dbprefix'] = ''; $db['default']['pconnect'] = TRUE; $db['default']['db_debug'] = TRUE; $db['default']['cache_on'] = FALSE; $db['default']['cachedir'] = '...