getSession

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getSession — Connect to a MySQL server

Опис

mysql_xdevapi\getSession(string $uri): mysql_xdevapi\Session

Connects to the MySQL server.

Параметри

uri

The URI to the MySQL server, such as mysqlx://user:password@host.

URI format:

scheme://[user[:[password]]@]target[:port][?attribute1=value1&attribute2=value2...

scheme: required, the connection protocol

In mysql_xdevapi it is always 'mysqlx' (for X Protocol)
user: optional, the MySQL user account for authentication
password: optional, the MySQL user's password for authentication
target: required, the server instance the connection refers to:

* TCP connection (host name, IPv4 address, or IPv6 address)

* Unix socket path (local file path)

* Windows named-pipe (local file path)
port: optional, network port of MySQL server.

by default port for X Protocol is 33060
?attribute=value: this element is optional and specifies a data dictionary that contains different options, including:
- The auth (authentication mechanism) attribute as it relates to encrypted connections. For additional information, see » Command Options for Encrypted Connections. The following 'auth' values are supported: plain, mysql41, external, and sha256_mem.
- The connect-timeout attribute affects the connection and not subsequent operations. It is set per connection whether on a single or multiple hosts.
  
  Pass in a positive integer to define the connection timeout in seconds, or pass in 0 (zero) to disable the timeout (infinite). Not defining connect-timeout uses the default value of 10.
  
  Related, the MYSQLX_CONNECTION_TIMEOUT (timeout in seconds) and MYSQLX_TEST_CONNECTION_TIMEOUT (used while running tests) environment variables can be set and used instead of connect-timeout in the URI. The connect-timeout URI option has precedence over these environment variables.
- The optional compression attribute accepts these values: preferred (client negotiates with server to find a supported algorithm; connection is uncompressed if a mutually supported algorithm is not found), required (like "preferred", but connection is terminated if a mutually supported algorithm is not found), or disabled (connection is uncompressed). Defaults to preferred.
  
  This option was added in version 8.0.20.
- The optional compression-algorithms attribute defines the desired compression algorithms (and their preferred usage order): zstd_stream (alias: zstd), lz4_message (alias: lz4), or deflate_stream (aliases: deflate or zlib). By default, the order used (depending on system availability) is lz4_message, zstd_stream, then deflate_stream. For example, passing in compression-algorithms=[lz4,zstd_stream] uses lz4 if it's available, otherwise zstd_stream is used. If both are unavailable then behavior depends on the compression value e.g., if compression=required then it'll fail with an error.
  
  This option was added in version 8.0.22.

Приклад #1 URI examples

mysqlx://foobar
mysqlx://root@localhost?socket=%2Ftmp%2Fmysqld.sock%2F
mysqlx://foo:bar@localhost:33060
mysqlx://foo:bar@localhost:33160?ssl-mode=disabled
mysqlx://foo:bar@localhost:33260?ssl-mode=required
mysqlx://foo:bar@localhost:33360?ssl-mode=required&auth=mysql41
mysqlx://foo:bar@(/path/to/socket)
mysqlx://foo:bar@(/path/to/socket)?auth=sha256_mem
mysqlx://foo:bar@[localhost:33060, 127.0.0.1:33061]
mysqlx://foobar?ssl-ca=(/path/to/ca.pem)&ssl-crl=(/path/to/crl.pem)
mysqlx://foo:bar@[localhost:33060, 127.0.0.1:33061]?ssl-mode=disabled
mysqlx://foo:bar@localhost:33160/?connect-timeout=0
mysqlx://foo:bar@localhost:33160/?connect-timeout=10&compression=required
mysqlx://foo:bar@localhost:33160/?connect-timeout=10&compression=required&compression-algorithms=[lz4,zstd_stream]

For related information, see MySQL Shell's » Connecting using a URI String.

Значення, що повертаються

A Session object.

Помилки/виключення

A connection failure throws an Exception.

Приклади

Приклад #2 mysql_xdevapi\getSession() example

<?php
try {
    $session = mysql_xdevapi\getSession("mysqlx://user:password@host");
} catch(Exception $e) {
    die("Connection could not be established: " . $e->getMessage());
}

$schemas = $session->getSchemas();
print_r($schemas);

$mysql_version = $session->getServerVersion();
print_r($mysql_version);

var_dump($collection->find("name = 'Alfred'")->execute()->fetchOne());
?>

Поданий вище приклад виведе щось схоже на:

Array
(
    [0] => mysql_xdevapi\Schema Object
        (
            [name] => helloworld
        )
    [1] => mysql_xdevapi\Schema Object
        (
            [name] => information_schema
        )
    [2] => mysql_xdevapi\Schema Object
        (
            [name] => mysql
        )
    [3] => mysql_xdevapi\Schema Object
        (
            [name] => performance_schema
        )
    [4] => mysql_xdevapi\Schema Object
        (
            [name] => sys
        )
)

80012

array(4) {
  ["_id"]=>
  string(28) "00005ad66abf0001000400000003"
  ["age"]=>
  int(42)
  ["job"]=>
  string(7) "Butler"
  ["name"]=>
  string(4) "Alfred"
}