mysqli::real_connect
mysqli_real_connect
(PHP 5, PHP 7, PHP 8)
mysqli::real_connect -- mysqli_real_connect — Opens a connection to a mysql server
Beschreibung
Objektorientierter Stil
string
$host
= ?,string
$username
= ?,string
$passwd
= ?,string
$dbname
= ?,int
$port
= ?,string
$socket
= ?,int
$flags
= ?): bool
Prozeduraler Stil
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.
Parameter-Liste
-
mysql
-
Nur bei prozeduralem Aufruf: Ein von mysqli_connect() oder mysqli_init() zurückgegebenes mysqli-Objekt.
-
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.
Hinweis:
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 thehost
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 ofwait_timeout
seconds) of inactivity before closing the connectionMYSQLI_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.Hinweis:
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.
Rückgabewerte
Gibt bei Erfolg true
zurück. Bei einem Fehler wird false
zurückgegeben.
Beispiele
Beispiel #1 mysqli::real_connect() example
Objektorientierter Stil
<?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_TIMEOUT, 5)) {
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";
$mysqli->close();
?>
Objektorientierter Stil when extending mysqli class
<?php
class foo_mysqli extends mysqli {
public function __construct($host, $user, $pass, $db) {
parent::init();
if (!parent::options(MYSQLI_INIT_COMMAND, 'SET AUTOCOMMIT = 0')) {
die('Setting MYSQLI_INIT_COMMAND failed');
}
if (!parent::options(MYSQLI_OPT_CONNECT_TIMEOUT, 5)) {
die('Setting MYSQLI_OPT_CONNECT_TIMEOUT failed');
}
if (!parent::real_connect($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();
?>
Prozeduraler Stil
<?php
$link = mysqli_init();
if (!$link) {
die('mysqli_init failed');
}
if (!mysqli_options($link, MYSQLI_INIT_COMMAND, 'SET AUTOCOMMIT = 0')) {
die('Setting MYSQLI_INIT_COMMAND failed');
}
if (!mysqli_options($link, MYSQLI_OPT_CONNECT_TIMEOUT, 5)) {
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);
?>
Die obigen Bespiele erzeugen folgende Ausgabe:
Success... MySQL host info: localhost via TCP/IP
Anmerkungen
Hinweis:
MySQLnd nimmt immer den Standardzeichensatz des Servers an. Dieser Zeichensatz wird während des Aufbaus der Verbindung bzw. der Authentifizierung übermittelt und danach von MySQLnd verwendet.
Libmysqlclient verwendet als Standardzeichensatz den, der in der Datei my.cnf angegeben oder durch einen Aufruf von mysqli_options() vor dem Aufruf von mysqli_real_connect() aber nach mysqli_init() gesetzt wurde.
Siehe auch
- mysqli_connect() - Alias von mysqli::__construct
- mysqli_init() - Initializes MySQLi and returns an object for use with mysqli_real_connect()
- mysqli_options() - Set options
- mysqli_ssl_set() - Used for establishing secure connections using SSL
- mysqli_close() - Schließt die zuvor geöffnete Datenbankverbindung