(PHP 5, PHP 7)
mysqli::__construct -- mysqli::connect -- mysqli_connect — Open a new connection to the MySQL server
Nesne yönelimli kullanım
$host
= ini_get("mysqli.default_host")
, string $username
= ini_get("mysqli.default_user")
, string $passwd
= ini_get("mysqli.default_pw")
, string $dbname
= ""
, int $port
= ini_get("mysqli.default_port")
, string $socket
= ini_get("mysqli.default_socket")
)$host
= ini_get("mysqli.default_host")
, string $username
= ini_get("mysqli.default_user")
, string $passwd
= ini_get("mysqli.default_pw")
, string $dbname
= ""
, int $port
= ini_get("mysqli.default_port")
, string $socket
= ini_get("mysqli.default_socket")
) : voidYordamsal kullanım
$host
= ini_get("mysqli.default_host")
, string $username
= ini_get("mysqli.default_user")
, string $passwd
= ini_get("mysqli.default_pw")
, string $dbname
= ""
, int $port
= ini_get("mysqli.default_port")
, string $socket
= ini_get("mysqli.default_socket")
) : mysqli|falseOpens a connection to the MySQL Server.
host
Can be either a host name or an IP address. The local host is
assumed when passing the null
value or the string "localhost" to this parameter.
When possible, pipes will be used instead of the TCP/IP protocol.
The TCP/IP protocol is used if a host name and port number are provided together e.g. localhost:3308
.
Prepending host by p:
opens a persistent connection.
mysqli_change_user() is automatically called on
connections opened from the connection pool.
username
The MySQL user name.
passwd
If not 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 is 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.
Bilginize:
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.
mysqli::__construct() always returns an object which represents the connection to a MySQL Server, regardless of it being successful or not.
mysqli_connect() returns an object which represents the connection to a MySQL Server,
başarısızlık durumunda false
döner.
mysqli::connect() returns null
on success başarısızlık durumunda false
döner.
If MYSQLI_REPORT_STRICT
is enabled and the attempt to connect
to the requested database fails, a mysqli_sql_exception is thrown.
Örnek 1 mysqli::__construct() example
Nesne yönelimli kullanım
<?php
/* You should enable error reporting for mysqli before attempting to make a connection */
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$mysqli = new mysqli('localhost', 'my_user', 'my_password', 'my_db');
/* Set the desired charset after establishing a connection */
$mysqli->set_charset('utf8mb4');
printf("Success... %s\n", $mysqli->host_info);
Yordamsal kullanım
<?php
/* You should enable error reporting for mysqli before attempting to make a connection */
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$mysqli = mysqli_connect('localhost', 'my_user', 'my_password', 'my_db');
/* Set the desired charset after establishing a connection */
mysqli_set_charset($mysqli, 'utf8mb4');
printf("Success... %s\n", mysqli_get_host_info($mysqli));
The above examples will output something similar to:
Success... localhost via TCP/IP
Örnek 2 Extending mysqli class
<?php
class FooMysqli extends mysqli {
public function __construct($host, $user, $pass, $db, $port, $socket, $charset) {
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
parent::__construct($host, $user, $pass, $db, $port, $socket);
$this->set_charset($charset);
}
}
$db = new FooMysqli('localhost', 'my_user', 'my_password', 'my_db', 3306, null, 'utf8mb4');
Örnek 3 Manual error handling
If error reporting is disabled, the developer is responsible for checking and handling failures
Nesne yönelimli kullanım
<?php
error_reporting(0);
mysqli_report(MYSQLI_REPORT_OFF);
$mysqli = new mysqli('localhost', 'my_user', 'my_password', 'my_db');
if ($mysqli->connect_errno) {
throw new RuntimeException('mysqli connection error: ' . $mysqli->connect_error);
}
/* Set the desired charset after establishing a connection */
$mysqli->set_charset('utf8mb4');
if ($mysqli->errno) {
throw new RuntimeException('mysqli error: ' . $mysqli->error);
}
Yordamsal kullanım
<?php
error_reporting(0);
mysqli_report(MYSQLI_REPORT_OFF);
$mysqli = mysqli_connect('localhost', 'my_user', 'my_password', 'my_db');
if (mysqli_connect_errno()) {
throw new RuntimeException('mysqli connection error: ' . mysqli_connect_error());
}
/* Set the desired charset after establishing a connection */
mysqli_set_charset($mysqli, 'utf8mb4');
if (mysqli_errno($mysqli)) {
throw new RuntimeException('mysqli error: ' . mysqli_error($mysqli));
}
Bilginize:
MySQLnd daima sunucunun öntanımlı bir karakter kümesi olduğunu varsayar. Bu karakter kümesi, mysqlnd'nin kullanacağı uzlaşım/kimlik doğrulama bağlantısı sırasında gönderilir.
Libmysqlclient, ya my.cnf dosyasındaki öntanımlı karakter kümesini ya da mysqli_init() çağrısından sonraki ilk mysqli_real_connect() çağrısından önce çağrılan mysqli_options() işlevinde belirtilen karakter kümesini kullanır.
Bilginize:
Nesne yönelimli kullanım only: If the connection fails, an object is still returned. To check whether the connection failed, use either the mysqli_connect_error() function or the mysqli->connect_error property as in the preceding examples.
Bilginize:
If it is necessary to set options, such as the connection timeout, mysqli_real_connect() must be used instead.
Bilginize:
Calling the constructor with no parameters is the same as calling mysqli_init().
Bilginize:
Error "Can't create TCP/IP socket (10106)" usually means that the variables_order configure directive doesn't contain character
E
. On Windows, if the environment is not copied theSYSTEMROOT
environment variable won't be available and PHP will have problems loading Winsock.