SunshinePHP Developer Conference 2015

mysqli::real_connect

mysqli_real_connect

(PHP 5)

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

Descrizione

Stile orientato agli oggetti

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

Stile procedurale

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

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.

Elenco dei parametri

link

Solo nello stile procedurale: un identificatore restituito da mysqli_connect() o 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.

Nota:

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)

Nota:

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.

Valori restituiti

Restituisce TRUE in caso di successo, FALSE in caso di fallimento.

Esempi

Example #1 mysqli::real_connect() example

Stile orientato agli oggetti

<?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();
?>

Stile orientato agli oggetti 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();
?>

Stile procedurale

<?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);
?>

I precedenti esempi visualizzeranno:

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

Note

Nota:

MySQLnd utilizza sempre il set di caratteri di default del sistema. Questo set di caratteri รจ inviato durante l'handshaking/autenticazione alla connessione.

Libmysqlclient usa il set di caratteri di default impostato nel file my.cnf o attraverso una chiamata esplicita a mysqli_options() prima di chiamare mysqli_real_connect(), ma dopo mysqli_init().

Vedere anche:

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User Contributed Notes 2 notes

up
2
Pom
4 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.
up
1
php-nospam325123 at brainpower dot no-ip dot org
3 years ago
this is because it tries to use sockets with the string localhost this is documented en known
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