Collation Locales and Default Parameters排序规则区域设置和默认参数¶

Behavior行为¶

Some collation locales have variants, which employ special language-specific rules. 一些排序规则区域设置有变体，它们使用特定于语言的特殊规则。To specify a locale variant, use the following syntax:要指定区域设置变量，请使用以下语法：

{ "locale" : "<locale code>@collation=<variant>" }

For example, to use the unihan variant of the Chinese collation:例如，要使用中文排序规则的unihan变体：

{ "locale" : "zh@collation=unihan" }

See the collation page for a full description of collation behavior and syntax.有关排序规则行为和语法的完整描述，请参阅排序规则页面。

Supported Languages and Locales支持的语言和地区¶

MongoDB’s collation feature supports the following languages. MongoDB的排序规则功能支持以下语言。The following table lists the supported languages and the associated locales as defined by ICU Locale ID. 下表列出了受支持的语言以及ICU Locale ID定义的相关语言环境。[1]

Collation Default Parameters排序规则默认参数¶

A collation document contains several optional parameters in addition to the required locale parameter. 除了必需的locale参数外，排序规则文档还包含几个可选参数。Depending on which locale you use, the default parameters may be different. 根据您使用的默认locale参数可能不同。See the collation page for a full description of collation syntax.有关排序规则语法的完整描述，请参阅排序规则页面。

The following default parameters are consistent across all locales:以下默认参数在所有地区都是一致的：

• caseLevel : false
• strength : 3
• numericOrdering : false
• maxVariable : punct

The following table shows the default collation parameters which may vary across different locales:下表显示了默认排序规则参数，这些参数在不同的地区可能有所不同：