(PHP 5)
mysqli::real_connect -- mysqli_real_connect — Opens a connection to a mysql server
Stile orientato agli oggetti
$host
[, string $username
[, string $passwd
[, string $dbname
[, int $port
[, string $socket
[, int $flags
]]]]]]] )Stile procedurale
$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.
linkSolo 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
socketparameter 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 thehostparameter.
flags
With the parameter flags you can set different
connection options:
| 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_STATEMENTflag is not supported in PHP. If you want to execute multiple queries use the mysqli_multi_query() function.
Restituisce TRUE in caso di successo, FALSE in caso di fallimento.
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_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";
$mysqli->close();
?>
Stile orientato agli oggetti when extending mysqli class
<?php
class foo_mysqli extends mysqli {
public function __construct($host, $user, $pass, $db) {
parent::init();
if (!parent::options(MYSQLI_INIT_COMMAND, 'SET AUTOCOMMIT = 0')) {
die('Setting MYSQLI_INIT_COMMAND failed');
}
if (!parent::options(MYSQLI_OPT_CONNECT_TIMEOUT, 5)) {
die('Setting MYSQLI_OPT_CONNECT_TIMEOUT failed');
}
if (!parent::real_connect($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();
?>
Stile procedurale
<?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);
?>
I precedenti esempi visualizzeranno:
Success... MySQL host info: localhost via TCP/IP
Nota:
MySQLnd utilizza sempre il set di caratteri di default del sistema. Questo set di caratteri รจ inviato durante l'handshaking/autenticazione alla connessione.
Libmysql 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().