-f name,age --fieldFile arg file with fields names - 1 per line -q [ --query ] arg query filter, as a JSON string --csv export to csv instead of json -o [ --out ] arg output file; if not specified, stdout is used --jsonArray output to a json array rather than one object...
--numInsertionWorkers= number of insert operations to run concurrently (defaults to 1) --stopOnError stop importing at first insert/upsert error --upsert insert or update objects that already exist --upsertFields= comma-separated fields for the query part of the upsert --writeConcern= write co...
or group of fields. The group key can also be the result of an expression. Use the _id field in the $group pipeline stage to set the group key.
db.mycoll.totalSize() - storage allocated for all data and indexes db.mycoll.update(query, object[, upsert_bool, multi_bool]) - instead of two flags, you can pass an object with fields: upsert, multi db.mycoll.validate( <full> ) - SLOW db.mycoll.getShardVersion() - only for use...
$group:将集合中的文档分组,可用于统计结果。 db.col.aggregate([{$group : {_id : "$by_user", ...}}]) 表达式 描述 实例 $sum 计算总和。 db.col.aggregate([{$group : {_id : "$by_user", num_tutorial : {$sum : "$likes"}}}]) $avg 计算平均值 db.col.aggregate([{$group : ...
db.mycoll.find([query],[fields]) - query is an optional query filter. fields is optional set of fields to return. e.g. db.mycoll.find( {x:77} , {name:1, x:1} ) db.mycoll.find(...).count() db.mycoll.find(...).limit(n) ...
--setparameter <options> specifies one of the mongodb parameters described in mongodb server parameters for a self-managed deployment . you can specify multiple setparameter fields. --nounixsocket disables listening on the unix domain socket. --nounixsocket applies only to unix-based systems. the...
() db.php.group( { key : ..., initial: ..., reduce : ...[, cond: ...] } ) db.php.insert(obj) db.php.insertOne( obj, ) - insert a document, optional parameters are: w, wtimeout, j db.php.insertMany( [objects], ) - insert multiple documents, optional parameters are: ...
数据类型描述String字符串。存储数据常用的数据类型。在 MongoDB 中,UTF-8 编码的字符串才是合法的。Integer整型数值。用于存储数值。根据你所采用的服务器,可分为 32 位或 64 位。Boolean布尔值。用于存储布尔值(真/假)。Double双精度浮点值。用于存储浮点值。Min/Max keys将一个值与BSON(二进制的 JSON)元素...
$group $setWindowFields $sortwhen the sort operation is not supported by an index $sortByCount Note Pipeline stages operate on streams of documents with each pipeline stage taking in documents, processing them, and then outputting the resulting documents. ...