php - PDO::setAttribute() doesn't seems to affect new PDO()? -

i have code

try {     $dbh = new pdo('mysql:host=localhost;dbname=db_informations', 'root', '');     $dbh->setattribute(pdo::attr_errmode, pdo::errmode_exception); } catch (pdoexception $e) {     echo $e->getmessage(); } 

and gives me exception message:

sqlstate[hy000] [1049] unknown database 'db_informations'

because correct name of database db_information only.

my question is, if don't include line:

$dbh->setattribute(pdo::attr_errmode, pdo::errmode_exception); 

i still same exception , think it's not necessary use it? it?

this because that's behaviour of pdo::__construct() can read in manual:

pdo::__construct() throws pdoexception if attempt connect requested database fails.

but if don't set error mode exception , do:

try {     $dbh = new pdo('mysql:host=localhost;dbname=db_informations', 'root', '');     $dbh->query("select * atablewhichdoesnotexists"); } catch(pdoexception $e) {     echo $e->getmessage(); } 

you won't excpetion message or error, because didn't set error mode. need this:

try {     $dbh = new pdo('mysql:host=localhost;dbname=db_informations', 'root', '');     $dbh->setattribute(pdo::attr_errmode, pdo::errmode_exception);     $dbh->query("select * atablewhichdoesnotexists"); } catch(pdoexception $e) {     echo $e->getmessage(); } 

to receive exception, can catch:

sqlstate[42s02]: base table or view not found: 1146 table 'test.atablewhichdoesnotexists' doesn't exist

---

also if think logically:

setattribute() needs used ->, means need instance of class call method. how able call method, if instance couldn't created correctly?

(so mean setattribute() have bee static, can set something/call before take instance of class)