What is the exception handling function of mysqli? -PHP source code

Ec (2); what is the exception handling function of mysqli? Classcheck {& nbsp; & nbsp; private $ host; & nbsp; & script ec (2); script

What is the exception handling function of mysqli?
Class check {
Private $ host;
Private $ name;
Private $ paw;
Public $ res;
Function connect ($ host, $ name, $ paw ){
// Var_dump ($ host, $ name, $ paw); exit ();
$ This-> res = @ new mysqli ($ host, $ name, $ paw );
//
If (! $ This-> res ){
Throw new Exception ("MySQL connect is error! ");
}
}

}

Try {
$ A = new check ();
$ A-> connect ("localhost", "root", "123 jodjg ");

} Catch (Exception $ e ){
Echo $ e-> getMessage ();
}

This is the code. If mysqli is not used. It's okay to use functions like mysql_connect.