(TTL indexesare special indexes that MongoDB can use to automatically remove documents from a collection after a certain amount of time. This is ideal for certain types of information like machine generated even
2、简单查找 查找文档:db.test_mac_id.find({'a': 'b'}) 删除文档:db.test_mac_id.remove({'a': 'b'}) 查找找到某一天的数据: db.a.find({'D' : ISODate('2014-04-21T00:00:00Z')}) 或者 db.a.find({'D' : ISODate('2014-04-21')}) 删除某一天的数据: db.region_mac_id_resul...
这是MongoDB官方文档。了解如何在灵活的文档中存储数据、创建MongoDB Atlas部署以及使用工具和集成的生态系统。
4,只删除第一个符合query filter的doc,设置justOne 参数为true db.users.remove({age:{$gt:21}},{justOne:true}) 5,以原子操作删除所有符合query filter的doc,即在一个原子操作中奖多个doc删除 db.users.remove({age:{$gte:21},$isolated:1}) 参考doc: Delete Documents...
https://docs.mongodb.com/manual/tutorial/update-documents/ #其他的也是如此,点击页面最下面,右击就能看到这个此操作详细的参数说明。 updateOne() 的参数: db.collection.updateOne( <filter>, <update>, { upsert: <boolean>, writeConcern: <document>, ...
删除集合 db.COLLECTION_NAME.drop() db.user.drop() 1、查找命令 //查找name等于zhangsan且age等于20的数据 db.user.find("name":"zhangsan","age": 20) //查找age大于等于24且age小于等于30的记录 db.user.find("age":{$gte:24,$lte:30}) ...
To remove all documents in a collection, call the remove method with an empty query document {}. The following operation deletes all documents from the bios collection: db.bios.remove( { } ) This operation is not equivalent to the drop() method. To remove all documents from a collection...
The deleteOne() method deletes a single document. If the query filter matches more than one document, the method will remove the first occurrence of a match in the collection. The deleteMany() method deletes all documents that match the query filter. The findOneAndDelete() method atomically ...
The said query that written will return all the documents in the restaurants collection in the current database in MongoDB. To get a formatted output in a more readable way the pretty() method can be used. This will display the documents in a formatted and easy-to-read way. ...
对于update操作,如果设置 multi:True,那么操作也可能在orphaned documents.上执行,这样也会产生多余的change stream,应用可能需要处理这种情侣。BTW,ofphaned document是很令人头疼的问题。 另外,MongoDB3.6只能针对单个collection进行watch,这样如果要关注多个collection或者多个db的write event时,需要分别建立连接进行watch,在...