It first uses thedistinctquery to ask MongoDB for an array of distinct values for theidfield. A special case is to use'0'when this returns an empty array. In theelsesection we're dealing with the usual case of generating the next value forid. Because this particular API specifiesidas as...
Between its Android platform, Office Suite, Mail Services, Blog Hosting and Video acquisition, there is no field untouched by Google’s reach. Today I want to talk a little about my experience using Gmail for corporate email.Dec 8, 2008 Post-Dating Blog Entries in Wordpress (or, the ...
MongoDB Manual / 参考 / 操作符 / 聚合管道操作符 定义 $getField 版本5.0 中的新增功能。 从文档中返回指定字段的值。如果未指定对象,$getField会返回$CURRENT中的字段值。 您可以使用$getField检索名称中包含句点 (.) 或以美元符号 ($) 开头的字段的值。
我们在本文中使用的NoSQL是MongoDB，它是一种开源的文档数据库系统，开发语言为C++。它提供 ...
mongodb 获取documentField mongodb getcollection,/*Collection集合操作*/(1)创建一个集合db.createCollection("collName",{size:20,capped:true,max:100});db.collName.isCapped();//判断集合是否为定容量(2)得到指定名称的集合db.getCollection("account");(3)得
1. Retrieve Distinct Values of Field As we mentioned the distinct method allows us to retrieve the distinct values for a specific field in a MongoDB collection. Following is the syntax of the method. # Syntax of distinct() db.collection.distinct(field, query) ...
方法名:getField WriteResult.getField介绍 暂无 代码示例 代码示例来源:origin: net.vz.mongodb.jackson/mongo-jackson-mapper /** * Gets a field * * @param name field name * @return The value */ publicObjectgetField(Stringname){ returnwriteResult.getField(name); ...
If an update/replace operation results in no change to the document (e.g. setting the value of a field to its current value), the modified count may be less than the value returned by getMatchedCount(). Return Values The total number of documents that were modified by all update ...
方法名:getField WriteResult.getField介绍 暂无 代码示例 代码示例来源:origin: net.vz.mongodb.jackson/mongo-jackson-mapper /** * Gets a field * * @param name field name * @return The value */ publicObjectgetField(Stringname){ returnwriteResult.getField(name); ...
The Action field for this API is GetMonitorData. Parameter Required Type Description namespace Yes String Namespace. Each Tencent Cloud service has a namespace. There are two namespaces for CLB: qce/lb_public for public network CLB and qce/lb_private for private network CLB. metricName Yes ...