$addFieldsappends new fields to existing documents. You can include one or more$addFieldsstages in an aggregation operation. To add field or fields to embedded documents (including documents in arrays) use the dot notation. Seeexample. To add an element to an existing array field with$addFields...
demo.deleteMany( filter, <optional params> ) - delete all matching documents, optional parameters are: w, wtimeout, j db.demo.distinct( key, query, <optional params> ) - e.g. db.demo.distinct( 'x' ), optional parameters are: maxTimeMS db.demo.drop() drop the collection db.demo....
indexes支持strings,numbers和nested documents 地理空间索引(Geospatial Index) 针对地理空间坐标数据创建索引。 2dsphere索引,用于存储和查找球面上的点 2d索引,用于存储和查找平面上的点 全文索引 MongoDB提供了针对string内容的文本查询,Text Index支持任意属性值为string或string数组元素的 索引查询。注意:一个集合仅支持...
ReplicaSetName=ReplicaSetName};// Credentialsettings.Credential=MongoCredential.CreateCredential(AuthDatabaseName,UserName,Password);// ServersvarmongoServers=Servers.Split(",",StringSplitOptions.RemoveEmptyEntries).ToList();if(mongoServers.Count
Mysql MongoDB 数据表 table Collections 数据行 row Documents 数据列 字段 Field 1. 2. 3. 4.1. 创建及查看库 1. 有则使用这个数据库没有则创建 use DATABASE_NAME 2. 查看当前选择的数据库, 默认是test db 3. 查看数据库,默认有admin、local和"test",如果数据库生成但是没有集合(下面会讲)所以此时...
To edit a field name, value, or type, click on the field name, value, or type. 4 ClickInsert. Insert Multiple Documents 1 Go to theFindtab in the Atlas UI. Select the collection and go to theFindtab. 2 ClickInsert Document.
}, _id: {$ne:'2'}}, {$push: {hobby: 'drinking'}})// WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })（7）$set{ $set: { <field1>: <value1>, ... } }设置字段的第一层的值（Set Top-Level Fields）设置嵌套字段的值 （Set Fields in Embedded Documents...
通过使用$add给pageViews字段的值加10,然后将结果赋值给一个新的字段:doctoredPageViews 注:必须将$add计算表达式放到中括号里面 除此之外使用$project还可以重命名字段名和子文档的字段名: db.article.aggregate( { $project : { title : 1 , page_views : "$pageViews" , ...
Learn about the $sort aggregation operator, which sorts all input documents and returns them to the pipeline in sorted order.
Task AddCommandAsync(Func<IClientSessionHandle, Task> func); /// /// 提交更改并返回受影响的行数 /// TODO:MongoDB单机服务器不支持事务【使用MongoDB事务会报错:Standalone servers do not support transactions】,只有在集群情况下才支持事务 /// 原因...