PHP - Manual: MongoDB\Driver\ReadPreference

2024-12-21

MongoDB\Driver\ReadPreference::bsonSerialize »

« MongoDB\Driver\WriteConcern::unserialize

The MongoDB\Driver\ReadPreference class

(mongodb >=1.0.0)

简介

类摘要

final class MongoDB\Driver\ReadPreference implements MongoDB\BSON\Serializable, Serializable {

/* Constants */

const int RP_PRIMARY = 1;

const int RP_PRIMARY_PREFERRED = 5;

const int RP_SECONDARY = 2;

const int RP_SECONDARY_PREFERRED = 6;

const int RP_NEAREST = 10;

const string PRIMARY = primary;

const string PRIMARY_PREFERRED = primaryPreferred;

const string SECONDARY = secondary;

const string SECONDARY_PREFERRED = secondaryPreferred;

const string NEAREST = nearest;

const int NO_MAX_STALENESS = -1;

const int SMALLEST_MAX_STALENESS_SECONDS = 90;

/* 方法 */

final public bsonSerialize(): object

final public __construct(string|int $mode, array $tagSets = null, array $options = array())

final public getHedge(): ?object

final public getMaxStalenessSeconds(): int

final public getMode(): int

final public getModeString(): string

final public getTagSets(): array

final public serialize(): string

final public unserialize(string $serialized): void

}

预定义常量

MongoDB\Driver\ReadPreference::RP_PRIMARY: All operations read from the current replica set primary. This is the default read preference for MongoDB.
MongoDB\Driver\ReadPreference::RP_PRIMARY_PREFERRED: In most situations, operations read from the primary but if it is unavailable, operations read from secondary members.
MongoDB\Driver\ReadPreference::RP_SECONDARY: All operations read from the secondary members of the replica set.
MongoDB\Driver\ReadPreference::RP_SECONDARY_PREFERRED: In most situations, operations read from secondary members but if no secondary members are available, operations read from the primary.
MongoDB\Driver\ReadPreference::RP_NEAREST: Operations read from member of the replica set with the least network latency, irrespective of the member's type.
MongoDB\Driver\ReadPreference::PRIMARY: All operations read from the current replica set primary. This is the default read preference for MongoDB.
MongoDB\Driver\ReadPreference::PRIMARY_PREFERRED: In most situations, operations read from the primary but if it is unavailable, operations read from secondary members.
MongoDB\Driver\ReadPreference::SECONDARY: All operations read from the secondary members of the replica set.
MongoDB\Driver\ReadPreference::SECONDARY_PREFERRED: In most situations, operations read from secondary members but if no secondary members are available, operations read from the primary.
MongoDB\Driver\ReadPreference::NEAREST: Operations read from member of the replica set with the least network latency, irrespective of the member's type.
MongoDB\Driver\ReadPreference::NO_MAX_STALENESS: The default value for the "maxStalenessSeconds" option is to specify no limit on maximum staleness, which means that the driver will not consider a secondary's lag when choosing where to direct a read operation.
MongoDB\Driver\ReadPreference::SMALLEST_MAX_STALENESS_SECONDS: The minimum value for the "maxStalenessSeconds" option is 90 seconds. The driver estimates secondaries' staleness by periodically checking the latest write date of each replica set member. Since these checks are infrequent, the staleness estimate is coarse. Thus, the driver cannot enforce a max staleness value of less than 90 seconds.

更新日志

版本说明

PECL mongodb 1.7.0

版本	说明
PECL mongodb 1.7.0	Added the `MongoDB\Driver\ReadPreference::PRIMARY`, `MongoDB\Driver\ReadPreference::PRIMARY_PREFERRED`, `MongoDB\Driver\ReadPreference::SECONDARY`, `MongoDB\Driver\ReadPreference::SECONDARY_PREFERRED`, `MongoDB\Driver\ReadPreference::NEAREST` constants. Implements Serializable.
PECL mongodb 1.2.0	Added the `MongoDB\Driver\ReadPreference::NO_MAX_STALENESS` and `MongoDB\Driver\ReadPreference::SMALLEST_MAX_STALENESS_SECONDS` constants. Implements MongoDB\BSON\Serializable.

Added the MongoDB\Driver\ReadPreference::PRIMARY, MongoDB\Driver\ReadPreference::PRIMARY_PREFERRED, MongoDB\Driver\ReadPreference::SECONDARY, MongoDB\Driver\ReadPreference::SECONDARY_PREFERRED, MongoDB\Driver\ReadPreference::NEAREST constants.

Implements Serializable.

PECL mongodb 1.2.0

Added the MongoDB\Driver\ReadPreference::NO_MAX_STALENESS and MongoDB\Driver\ReadPreference::SMALLEST_MAX_STALENESS_SECONDS constants.

Implements MongoDB\BSON\Serializable.

MongoDB\Driver\ReadPreference::bsonSerialize — Returns an object for BSON serialization
MongoDB\Driver\ReadPreference::__construct — Create a new ReadPreference
MongoDB\Driver\ReadPreference::getHedge — Returns the ReadPreference's "hedge" option
MongoDB\Driver\ReadPreference::getMaxStalenessSeconds — Returns the ReadPreference's "maxStalenessSeconds" option
MongoDB\Driver\ReadPreference::getMode — Returns the ReadPreference's "mode" option
MongoDB\Driver\ReadPreference::getModeString — Returns the ReadPreference's "mode" option as a string
MongoDB\Driver\ReadPreference::getTagSets — Returns the ReadPreference's "tagSets" option
MongoDB\Driver\ReadPreference::serialize — Serialize a ReadPreference
MongoDB\Driver\ReadPreference::unserialize — Unserialize a ReadPreference

add a note

User Contributed Notes

There are no user contributed notes for this page.

官方地址：https://www.php.net/manual/en/class.mongodb-driver-readpreference.php

有任何技术问题请点击这里网站运营推广招聘

IT PHP 编程语言 Linux 开发编程科技 Elasticsearch HTML/CSS/XML 网络数据库 JAVA 面试 NoSQL C/C++ Golang Git 算法操作系统正则表达式 Redis 互联网 MySql JavaScript 运维软件国际架构设计 Mac OS TCP/IP Excel Vim Windows Socket Oracle VR MongoDB Python 运营 MemCache 商业硬件电子娱乐设计 nginx 摄影游戏 WordPress HTTP 团建数码电器

php7 安装fileinfo扩展 preg_split — 通过一个正则表达式分隔字符串 php位值,解决 PHP 中 usort 在值相同时改变原始位置的问题 [PHP] inet_pton/inet_ntop IP地址转换函数 [鸟哥]PHP_INT_MIN 和 -9223372036854775808 PHP 8.1 ADORecordSet对象 adodb手册 opcache预加载 Composer的Packagist资源 array_multisort() 多字段排序 PHPMailer设置utf8 PHPMailer字符集CharSet mysql面试题 PHP json解析（json_decode）页面工具 [原创]诡异的php-fpm超时问题 php中几种注释规范纯php实现DES以及TripleDES加密算法 php 修改图片大小 PHP5 扩展SOAP 调用 webservice [鸟哥]PHP FFI详解 - 一种全新的PHP扩展方式

略微加速

PHP官方手册 - 互联网笔记

The MongoDB\Driver\ReadPreference class

简介

类摘要

预定义常量

更新日志

目录

User Contributed Notes