PHP Dokumentation: Mysqli real-connect
12. Januar 2010 von werner
mysqli::real_connect
mysqli_real_connect
(PHP 5)
mysqli::real_connect — mysqli_real_connect — Opens a connection to a mysql server
Beschreibung
Object oriented style (method)
Procedural style
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
- link
Nur bei prozeduralem Aufruf: Ein vonmysqli_connect() oder mysqli_init()zurückgegebenes Verbindungsobjekt.
- 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 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) 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. Im Fehlerfall wird FALSE zurückgegeben.
Beispiele
Beispiel #1 Object oriented style
<?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();
?>Beispiel #2 Object oriented style when extending mysqli class
<?phpclass 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();
?>Beispiel #3 Procedural style
<?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);
?>Das oben gezeigte Beispiel erzeugt folgendeAusgabe:
Success... MySQL host info: localhost via TCP/IP
Siehe auch
- mysqli_connect() – Open a new connection to the MySQL server
- mysqli_init() – Initializes MySQLi and returns a resource for use with mysqli_real_connect()
- mysqli_options() – Set options
- mysqli_ssl_set() – Used for establishing secure connections using SSL
- mysqli_close() – Closes a previously opened database connection
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