mongodb shell tutorial

Tags: http io os ar sp file data on CTIRemove () methodThe Remove () method of MongoDB is used to remove a document from the collection. The Remove () method accepts two parameters. The first one is to delete the criteria, the second is the JUSTONE flag: Deletion criteria: (optional) Delete the standard, depending on the file will be deleted. Justone: (optional) If set to TRUE or 1, then delete only one file. Grammar:The basic syntax

configuration is successful, you will see the following screen:In the browser input: http://localhost:27017/, you can see the following prompt:You is trying to access MongoDB on the native driver port. For HTTP diagnostic access, add the port numberThus, the MongoDB database service has been successfully started.To test a simple JavaScript statement with Mongo.exe:D:\mondb>mongo>3+36>db>test> Db.foo.insert

Label:Here, I simply record the basic commands MongoDB uses in the shell client, such as creating/displaying a database, creating a collection, deleting a collection, and so on. First, start MongoDB and connect to the shell client Use the Mongod.exe and Mongo.exe commands to start and connect to the database s

。update : update的对象和一些更新的操作符（如$,$inc...）等，也可以理解为sql update查询内set后面的upsert : 可选，这个参数的意思是，如果不存在update的记录，是否插入objNew,true为插入，默认是false，不插入。multi : 可选，mongodb 默认是false,只更新找到的第一条记录，如果这个参数为true,就把按条件查出来多条记录全部更新。writeConcern :可选，抛出异常的级别。Example:db.col.update({‘title‘: "个人主页"}, {$set:{‘title‘: "BerMaker"}})Save () methodThe syntax format is as follows:db.collection.save( Parameter description:document : 文档数据。writeConcern :可选，抛出异常的级别。Example:db.col.save({"_id

Tags: MongoDB automatic installationVim mongodb_install.sh#!/bin/bash cd/opt/echo "Downloadmongdbsoftware ..." wgethttps://fastdl.mongodb.org/ Linux/mongodb-linux-x86_64-ubuntu1404-3.0.4.tgz echo "mongdbsoftware ..." tar-zxf Mongodb-linux*.tgz Mkdirsoftware Mvmongodb-linux-*.tgzsoftware mvmongodb-linux* MongoDB cdmongo

phone number , Field2,field3,fiel D4,field5,field6,field7--file/data/test.txtmongoexport-d test_dbtsv-c test_table--csv-u zhou-p 123-f mobile phone number , Field2,field3,field4,field7-o/data/test . txtExport data to specify fieldsThe two platforms are mainly local file path is different, if you want to log in with the user name password to write the corresponding parameters (-u-p)! The prerequisite for user authentication is to assign the account password to the database test_dbcsv in advance:

What is a MongoDB shell?The Mongdb shell is a fully functional JavaScript interpreter that can run JavaScript programs.However, the role of the shell is much more than this, it is mainly used to connect the MongoDB server, execute the script, the database operation. Administ

PHP Simple Operation MongoDB Method (installation and additions and deletions to change), MongoDB additions and deletions This article describes the simple operation of the MongoDB method of PHP. Share to everyone for your reference, as follows: PHP operation MongoDB Words first from the Internet to download

Myurl="http://see.xidian.edu.cn/cpp/shell/" ReadOnly Myurl Myurl="http://see.xidian.edu.cn/cpp/danpianji/" Run the script with the following results:/bin/sh:name:this variable is read only.Delete a variableUse the unset command to delete a variable . Grammar: Unset variable_name The variable cannot be used again after it has been deleted; The unset command cannot delete a read-only variable.As an example:

collection is empty, MongoDB will create an index when using shardcollection ().3.7 Adding 200,000 data to the user collectionAdd 200,000 data to the user collection to see how the collection is so fragmented for (var i = 0; I Use Sh.status () to view shard conditions ---sharding Status--- sharding version: { "_id": 1, "mincompatibleversion": 5, "CurrentVersion": 6, We can see that the collection of data is divided into a shard named Shardrep

for critical data, it is better to use W:1 J:true. It is important to note that journal is recommended to open anyway, set j:true, just say driver call GetLastError () to wait for journal write to complete before returning. This is not to say that the server-side journal is closed without setting j:true. About GetLastError ()In general, developers write code, do not need to call the Db.getlasterror () function, driver after each write operation, will automatically call the method immediately.

Edit session. in themongo shell, typemyfunction to See the function definition: myFunction The result should is the changes from your saved edit: function Myfun Ction () {print ("This is edited");} Note: As MONGO Shell interprets code edited in a external editor, it may modify code in functions, depending on the Ja Vascript compiler. For MONGO could convert to 2 or remove comment

I have been busy deploying MongoDB clusters recently, and I feel it is quite troublesome to deploy them in parts. There are no MongoDB O M tools on the Internet, so it took two days to write a shell script to start and stop the MongoDB cluster, hoping to save time and effort when