MongoDB\Driver\WriteConcern::isDefault

(mongodb >=1.3.0)

MongoDB\Driver\WriteConcern::isDefault — Checks if this is the default write concern

说明

final public MongoDB\Driver\WriteConcern::isDefault(): bool

Returns whether this is the default write concern (i.e. no options are specified). This method is primarily intended to be used in conjunction with MongoDB\Driver\Manager::getWriteConcern() to determine whether the Manager has been constructed without any write concern options.

The driver will not include a default write concern in its write operations (e.g. MongoDB\Driver\Manager::executeBulkWrite()) in order to allow the server to apply its own default, which may have been » modified. Libraries that access the Manager's write concern to include it in their own write commands should use this method to ensure that default write concerns are left unset.

参数

此函数没有参数。

返回值

Returns true if this is the default write concern and false otherwise.

错误／异常

Throws MongoDB\Driver\Exception\InvalidArgumentException on argument parsing errors.

范例

示例 #1 MongoDB\Driver\WriteConcern::isDefault() example


<?php

$wc = new MongoDB\Driver\WriteConcern(1);
var_dump($wc->isDefault());

$manager = new MongoDB\Driver\Manager('mongodb://127.0.0.1/?w=majority');
$wc = $manager->getWriteConcern();
var_dump($wc->isDefault());

$manager = new MongoDB\Driver\Manager('mongodb://127.0.0.1/');
$wc = $manager->getWriteConcern();
var_dump($wc->isDefault());

?>

以上例程会输出：

bool(false)
bool(false)
bool(true)

参见

MongoDB\Driver\Manager::getWriteConcern() - Return the WriteConcern for the Manager
» Modify Default Write Concern in the MongoDB manual
» Write Concern reference

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/mongodb-driver-writeconcern.isdefault.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 JAVA NoSQL 数据库面试 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 array_multisort() 多字段排序 PHPMailer设置utf8 PHPMailer字符集CharSet ADORecordSet对象 adodb手册 PHP 8.1 [鸟哥]PHP_INT_MIN 和 -9223372036854775808 opcache预加载 Composer的Packagist资源 mysql面试题 [鸟哥]PHP FFI详解 - 一种全新的PHP扩展方式 PHP7添加redis扩展 PHPstorm 里面Terminal 不能使用 esc键吗退出编辑模式吗 php设置cookie为httponly防止xss攻击 PHP mkdir()写出来的权限与mode值不符合 Packagist / Composer 中国全量镜像 laravel框架查看sql语句方式

略微加速

PHP官方手册 - 互联网笔记

MongoDB\Driver\WriteConcern::isDefault

说明

参数

返回值

错误／异常

范例

参见

User Contributed Notes