mongodb deleteone

the "Increase", "Change", "check" the function, next we look at the "delete" this function. MongoDB provides three APIs for delete operations, namely: Db.collection.deleteOne () Db.collection.deleteMany () 3.2 version added Db.collection.remove () 3.2 version added Each of the three APIs supports a filter condition parameter that matches the document that satisfies the criteria and then deletes the operation.From the literal m

OverviewMongoDB provides clients the ability to perform write operations in bulk. Bulk write operations affect a single collection. MongoDB allows applications to determine the acceptable level of acknowledgement required for bulk write operations.New in version 3.2.The Db.collection.bulkWrite () method provides the ability to perform bulk INSERT, update, and remove operations. MongoDB also supports BULK in

\Desktop\node>var MongoClient = require(‘mongodb‘).MongoClient;var url = "mongodb://127.0.0.1:27017/mingming"; // 连接的urlMongoClient.connect(url, { useNewUrlParser: true }, (err, db) => { // 调用封装好的connect按照url建立和MongoDB之间的连接 if (err) { throw err; } var dbo = db.db(‘mingming‘); var whereStr = {"name":"mingming"}; // 查询条件 var updateStr = {$set

MongoDB Study Notes (1) -- install MongoDB in Windows and take mongodb Study Notes First, download the windows Installation Package for mongodb from the official website, select a 32-bit or 64-bit version based on your system type, and then follow the prompts to complete the next step. If the installation directory is

Mongoclient.connect (urls,function (err,db) { //Get Connection 9 assert.equal (null,err); Use the assertion module instead of the previous if to determine the data of the db.collection ("T1"). Find ({"name": "Xiaoming"}). ToArray (Function ( Err,result) { assert.equal (null,err); console.log (result); db.close ()) 18 19 20});Run, successfully finds the data inserted in the previous stepDelete using Deleteone to delete a piece of

8Mongoclient.connect (Urls,function(ERR,DB) {//Get Connections9Assert.equal (NULL, err);//use assertion module instead of previous if judgmentTen One A //Find Data -Db.collection ("T1"). Find ({"name": "Xiaoming"}). ToArray (function(err,result) { -Assert.equal (NULL, err); the Console.log (result); - db.close (); - }) - + -});Run, successfully finds the data inserted in the previous stepDelete using Deleteone to delete a piece of dat

(i + = Id = = "365", person);//Deletecollection. Deleteone(i + = Id = = "365"); Because LINQ is supported, it is very convenient to use. Of course, you can also use the query function of MongoDB itself. //Enquiryresult = collection. Find(Buildersperson);. Filter. Eq(i=>i.Name, "Jack"). ToList();//UpdateCollection. replaceone(Buildersperson). Filter. Eq(i + =Id, "365"), person);//Update Partial f

Mongodb series: first recognized by Mongodb and first recognized by mongodb Series I. background: We are honored to have taken part in the examination system maintenance at the beginning of the month. (For more information, see the activities we attended in those years: System Maintenance summary for the first half of the 15 years.) It is mainly responsible for s

[Learning MongoDB step by step]-Brief Introduction to MongoDB (1), brief introduction to mongodb In the previous blog, we spoke about NoSQL. We have a comprehensive understanding of NoSQL. Starting from this blog, we will take everyone into the MongoDB world. Next we will introduce

One of the primary MongoDB series: MongoDB installation and recommended configuration; Primary mongodb Analysis The first time I heard about apsaradb for MongoDB, I must have heard a lot about it before I decided to learn about it. No matter what purpose you start to embark on this learning journey, I am also happy to

Mongodb advanced 3: mongodb management and mongodb advanced management Http://blog.csdn.net/stronglyh/article/details/46827141 Usually, there are many win development environments, but the production environment should be put on unix. I. Command There will be a lot of installation, there are a lot of information on the Internet, the following are some parametersQ

); //DeleteCollection. Deleteone (i = i.id = ="365");Because LINQ is supported, it is very convenient to use. Of course, you can also use the query function of MongoDB itself.//Enquiryresult = collection. Find (BUILDERS"Jack")). ToList ();//UpdateCollection. Replaceone (BUILDERS"365"), person); //Update Partial fieldsCollection. Updateone (BUILDERS"365"), Builders -)); //DeleteCollection.

[MongoDB] Build a mongodb sharding cluster on the windows platform (2). mongodb Cluster In the previous blog, we talked about the main principles of Mongodb sharding clusters. In this blog, we will mainly describe how to build a sharded cluster. There are two steps to configure a sharding cluster: first, start all the

Mongodb advanced 2: mongodb aggregation and mongodb advanced AggregationIn the previous article we talked about mongodb's advanced query: http://blog.csdn.net/stronglyh/article/details/46817789 This article introduces mongodb aggregation. I. mongodb has many aggregation fram

Tags: index XA requires action set x86 read and Write permissions God BPAinstallation :1 Download Linux installation package 2 on the official website in Linux decompression 3 will unzip the directory MV to the specified installation directoryMV mongodb-linux-x86_64-rhel70-3.6. 5//usr/local/mongodb4 CD to the bin directory, execute the following command to add the environment variable:Export path= $PATH:/usr/local/

MongoDB learning notes 01 MongoDB installation and use, mongodb learning notes Recently, due to work needs, I began to contact mongodb, so I began to study mongodb. The first step of the study was naturally from installation and use. there will certainly be more research and