mysqli::real_connect

mysqli_real_connect

(PHP 5, PHP 7)

mysqli::real_connect -- mysqli_real_connectOpens a connection to a mysql server

Opis

Styl obiektowy

mysqli::real_connect ([ string $host [, string $username [, string $passwd [, string $dbname [, int $port [, string $socket [, int $flags ]]]]]]] ) : bool

Styl proceduralny

mysqli_real_connect ( mysqli $link [, string $host [, string $username [, string $passwd [, string $dbname [, int $port [, string $socket [, int $flags ]]]]]]] ) : bool

Establish a connection to a MySQL database engine.

This function differs from mysqli_connect():

  • mysqli_real_connect() needs a valid object which has to be created by function mysqli_init().

  • With the mysqli_options() function you can set various options for connection.

  • There is a flags parameter.

Parametry

połączenie

Tylko styl proceduralny: Identyfikator połączenia zwrócony przez mysqli_connect() lub mysqli_init()

host

Can be either a host name or an IP address. Passing the NULL value or the string "localhost" to this parameter, the local host is assumed. When possible, pipes will be used instead of the TCP/IP protocol.

username

The MySQL user name.

passwd

If provided or NULL, the MySQL server will attempt to authenticate the user against those user records which have no password only. This allows one username to be used with different permissions (depending on if a password as provided or not).

dbname

If provided will specify the default database to be used when performing queries.

port

Specifies the port number to attempt to connect to the MySQL server.

socket

Specifies the socket or named pipe that should be used.

Informacja:

Specifying the socket parameter will not explicitly determine the type of connection to be used when connecting to the MySQL server. How the connection is made to the MySQL database is determined by the host parameter.

flags

With the parameter flags you can set different connection options:

Supported flags
Name Description
MYSQLI_CLIENT_COMPRESS Use compression protocol
MYSQLI_CLIENT_FOUND_ROWS return number of matched rows, not the number of affected rows
MYSQLI_CLIENT_IGNORE_SPACE Allow spaces after function names. Makes all function names reserved words.
MYSQLI_CLIENT_INTERACTIVE Allow interactive_timeout seconds (instead of wait_timeout seconds) of inactivity before closing the connection
MYSQLI_CLIENT_SSL Use SSL (encryption)
MYSQLI_CLIENT_SSL_DONT_VERIFY_SERVER_CERT Like MYSQLI_CLIENT_SSL, but disables validation of the provided SSL certificate. This is only for installations using MySQL Native Driver and MySQL 5.6 or later.

Informacja:

For security reasons the MULTI_STATEMENT flag is not supported in PHP. If you want to execute multiple queries use the mysqli_multi_query() function.

Rejestr zmian

Wersja Opis
5.6.16 Added the MYSQLI_CLIENT_SSL_DONT_VERIFY_SERVER_CERT flag for MySQL Native Driver

Zwracane wartości

Zwraca TRUE w przypadku powodzenia, FALSE w przypadku błędu.

Przykłady

Przykład #1 mysqli::real_connect() example

Styl obiektowy

<?php

$mysqli 
mysqli_init();
if (!
$mysqli) {
    die(
'mysqli_init failed');
}

if (!
$mysqli->options(MYSQLI_INIT_COMMAND'SET AUTOCOMMIT = 0')) {
    die(
'Setting MYSQLI_INIT_COMMAND failed');
}

if (!
$mysqli->options(MYSQLI_OPT_CONNECT_TIMEOUT5)) {
    die(
'Setting MYSQLI_OPT_CONNECT_TIMEOUT failed');
}

if (!
$mysqli->real_connect('localhost''my_user''my_password''my_db')) {
    die(
'Connect Error (' mysqli_connect_errno() . ') '
            
mysqli_connect_error());
}

echo 
'Success... ' $mysqli->host_info "\n";

$mysqli->close();
?>

Styl obiektowy when extending mysqli class

<?php

class foo_mysqli extends mysqli {
    public function 
__construct($host$user$pass$db) {
        
parent::init();

        if (!
parent::options(MYSQLI_INIT_COMMAND'SET AUTOCOMMIT = 0')) {
            die(
'Setting MYSQLI_INIT_COMMAND failed');
        }

        if (!
parent::options(MYSQLI_OPT_CONNECT_TIMEOUT5)) {
            die(
'Setting MYSQLI_OPT_CONNECT_TIMEOUT failed');
        }

        if (!
parent::real_connect($host$user$pass$db)) {
            die(
'Connect Error (' mysqli_connect_errno() . ') '
                    
mysqli_connect_error());
        }
    }
}

$db = new foo_mysqli('localhost''my_user''my_password''my_db');

echo 
'Success... ' $db->host_info "\n";

$db->close();
?>

Styl proceduralny

<?php

$link 
mysqli_init();
if (!
$link) {
    die(
'mysqli_init failed');
}

if (!
mysqli_options($linkMYSQLI_INIT_COMMAND'SET AUTOCOMMIT = 0')) {
    die(
'Setting MYSQLI_INIT_COMMAND failed');
}

if (!
mysqli_options($linkMYSQLI_OPT_CONNECT_TIMEOUT5)) {
    die(
'Setting MYSQLI_OPT_CONNECT_TIMEOUT failed');
}

if (!
mysqli_real_connect($link'localhost''my_user''my_password''my_db')) {
    die(
'Connect Error (' mysqli_connect_errno() . ') '
            
mysqli_connect_error());
}

echo 
'Success... ' mysqli_get_host_info($link) . "\n";

mysqli_close($link);
?>

Powyższe przykłady wyświetlą:

Success... MySQL host info: localhost via TCP/IP

Notatki

Informacja:

MySQLnd zawsze przyjmuje domyślne kodowanie znaków serwera. To kodowanie jest przesyłane podczas połączenia hand-shake/authentication, którego używa mysqlnd.

Libmysql używa domyślnego kodowania znaków ustawionego w pliku my.cnf lub przez jawne wywołanie funkcji mysqli_options() przed wywołaniem mysqli_real_connect(), ale po wywołaniu mysqli_init().

Zobacz też:

add a note add a note

User Contributed Notes 2 notes

up
0
php-nospam325123 at brainpower dot no-ip dot org
9 years ago
this is because it tries to use sockets with the string localhost this is documented en known
up
0
Pom
10 years ago
Notice that when using "localhost" as hostname the port option might be ignored.

If you wish to connect thru a different port than default, substitute "127.0.0.1" for localhost.
To Top