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mysqli_real_connect

(PHP 5)

mysqli_real_connect

(no version information, might be only in CVS)

mysqli->real_connect() -- Opens a connection to a mysql server

说明

Procedural style

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

Object oriented style (method)

class mysqli {

bool real_connect ( [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 function mysqli_options() you can set various options for connection.

  • There is a flags parameter.

参数

link

Procedural style only: A link identifier returned by mysqli_connect() or 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.

注意: 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:

表 1. Supported flags

NameDescription
MYSQLI_CLIENT_COMPRESSUse compression protocol
MYSQLI_CLIENT_FOUND_ROWSreturn number of matched rows, not the number of affected rows
MYSQLI_CLIENT_IGNORE_SPACEAllow 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_SSLUse SSL (encryption)

注意: 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.

返回值

如果成功则返回 TRUE，失败则返回 FALSE。

范例

例 1. Object oriented style

<?php

/* create a connection object which is not connected */
$mysqli = mysqli_init();

/* set connection options */
$mysqli->options(MYSQLI_INIT_COMMAND, "SET AUTOCOMMIT=0");
$mysqli->options(MYSQLI_OPT_CONNECT_TIMEOUT, 5);

/* connect to server */
$mysqli->real_connect('localhost', 'my_user', 'my_password', 'world');

/* check connection */
if (mysqli_connect_errno()) {
    printf("Connect failed: %s\n", mysqli_connect_error());
    exit();
}

printf ("Connection: %s\n.", $mysqli->host_info);

$mysqli->close();
?>

例 2. Procedural style

<?php

/* create a connection object which is not connected */
$link = mysqli_init();

/* set connection options */
mysqli_options($link, MYSQLI_INIT_COMMAND, "SET AUTOCOMMIT=0");
mysqli_options($link, MYSQLI_OPT_CONNECT_TIMEOUT, 5);

/* connect to server */
mysqli_real_connect($link, 'localhost', 'my_user', 'my_password', 'world');

/* check connection */
if (mysqli_connect_errno()) {
    printf("Connect failed: %s\n", mysqli_connect_error());
    exit();
}

printf ("Connection: %s\n.", mysqli_get_host_info($link));

mysqli_close($link);
?>

上例将输出：

Connection: Localhost via UNIX socket

参见

mysqli_connect()
mysqli_init()
mysqli_options()
mysqli_ssl_set()
mysqli_close()



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