protectedoverridevoidExecute(IMongoCollection<BsonDocument> collection,boolasync){if(async) { collection.CountAsync(_filter, _options).GetAwaiter().GetResult(); }else{ collection.Count(_filter, _options); } } 开发者ID:RavenZZ,项目名称:MDRelation,代码行数:11,代码来源:CountTest.cs 示例4: Creat...
$group: { _id: <expression>, <field1>: { <accumulator1> : <expression1> }, ... # 按什么字段分组,注意所有字段名前面都要加$,否则mongodb就为以为不加$的是普通常量,其中accumulator又包括以下几个操作符 # $sum,$avg,$first,$last,$max,$min,$push,$addToSet #如果group by null就是 count(...