mongoexport -d dbname -c collectionname -o file --type json/csv -f field 参数说明: -d :数据库名 -c :collection名 -o :输出的文件名file --type : 输出的格式,默认为json -f :输出的字段,如果-type为csv,则需要加上-f "字段名"fileld 示例: mongoexport -d mongotest -c users -o D:/...
在MongoDB中,你可以直接通过use dbname来切换到这个数据库上下文下面,系统会自动延迟创建该数据库,例如: show dbs local 0.078GB use LuceneIndexDB switched to db LuceneIndexDB show dbs local 0.078GB db LuceneIndexDB db.storeCollection.save({'version':'3.5', 'segment':'e3ol6'}) WriteResult({ "nI...
> db.col.insert(document) WriteResult({ "nInserted" : 1 }) > 插入文档你也可以使用db.col.save(document)命令。如果不指定_id字段save()方法类似于insert()方法。如果指定_id字段,则会更新该_id的数据。 3.2 版本后还有以下几种语法可用于插入文档: db.collection.insertOne():向指定集合中插入一条文档...
> db.users.find() { "_id" : 1, "username" : "mengday8" } { "_id" : 2, "username" : "mengday8" } > db.users.save({ "_id" : 3, "mengday9" : 20}) WriteResult({ "nMatched" : 0, "nUpserted" : 1, "nModified" : 0, "_id" : 3 }) > db.users.save({ "_id...
As a result, saving and retrieving data in relational format is expensive compared with storing it in the cloud. The demand for continuous data delivery is on the rise, with more applications expecting real-time data from your data storage. MongoDB allows you to save ob...
Save the content to a filemongodb-windows-x86_64-8.0.4-signed.msi.sha256in your Downloads folder. 3 Compare the signature file to the MongoDB installer hash. To compare the signature file to the hash of the MongoDB binary, invoke this Powershell script: ...
方法: MongoDB中的集合查询(获取一组文档中某个字段的不同值列表) 运用方法:DBCollection对象方法中的 distinct() 语句: 语句结构:distinct(key,[query]) key字符串,指定获取哪个字段的不同值;query:包含标准查询选项的对象,指定了要从哪个文档中获取不同的字段值 ...
默认为false。DBCollection.prototype.save保存文档。如果DOC没有_id或集合中无该_id值的文档,则插入文档;否则更新该_id值的文档。var WRITERESULT = DBCOLLECTION.save(DOC);返回WriteResult类型。DBCollection.prototype.stats查看集合的状态。var OBJ = DBCOLLECTION.stats(<SCALE_FACTOR>);...
As a result, fetching the data means connecting first to the MongoDB server, then to the test database, then finding the collection “things.” This is what the first four lines inFigure 5do—create a Mongo object that represents the connection, connects to the server, connects to the tes...
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