postgresql error code

@makif,

What kind of connection are you using to connect to the database? PDO? Can we see your database config settings (minus the password)?

PHP Code:

$db['master'] = array(
    'dsn'    => '',
    'hostname' => $db_info_master["hostname"],
    'username' => $db_info_master["username"],
    'password' => $db_info_master["password"],
    'database' => $db_info_master["database"],
    'port'  => $db_info_master["port"],
    'dbdriver' => 'postgre',
    'dbprefix' => '',
    'pconnect' => FALSE,
    'db_debug' => FALSE,
    'cache_on' => FALSE,
    'cachedir' => 'application/cache',
    'char_set' => 'utf8',
    'dbcollat' => 'utf8_general_ci',
    'swap_pre' => '',
    'encrypt' => FALSE,
    'compress' => FALSE,
    'stricton' => FALSE,
    'failover' => array(),
    'save_queries' => TRUE    
); 


i guess we missunderstanding, i can connect the database, but if i set some value wrong,i want to see error code as mysql in codeigniter. 
for example  2002 hostname error in mysql, 1045 username or password, 1049 database name error, i can see this error code in mysql, but i dont see in postgresql,  if user set wrong value to database, how can i see postgresql's  database error codes