postgresql error code

hey 
i want to see database error code in postgresql when some  database connection values are wrong.
i use  $this->db->error() but postgresql not showing error code.
in postgre_driver.php has that function 

PHP Code:

public function error()
    {
        return array('code' => '', 'message' => pg_last_error($this->conn_id));
    } 


i used pg_result_error function but it didnot show me the error codes. 
how can i see error code or how can i set error code in posgresql ?

thanks for helping

@makif,

These links might help you.
https://forum.codeigniter.com/thread-68046.html
https://stackoverflow.com/questions/1248...o-database

@makif,

These links might help you.
https://forum.codeigniter.com/thread-68046.html
https://stackoverflow.com/questions/1248...o-database

@php_rocs thanks for fast reply but it didnot work.
i got error code if i use mysql database but i dont get codes in postgresql

@makif,

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

@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

@makif

According to the documentation ( https://codeigniter.com/user_guide/datab...-of-values ) your setting for db_debug should be TRUE.

@makif

According to the documentation ( https://codeigniter.com/user_guide/datab...-of-values ) your setting for db_debug should be TRUE.

thanks for replying
i tried but not working
also i dont think its about de_debug because i set false in mysql and it shows me error code