MongoDB

MongoDB Download: https://www.mongodb.com/download-center#communityInstall into the C packing directoryCreate Data CatalogMongoDB stores the data directory in the DB directory. However, this data directory is not actively created, and we need to

Batch array update $addToSet combined with $eachDb.text.update ({_id:1000},{$addToSet: {books:{$each: ["JS", "DB"]}})$each will loop the following array to $addtoset each valueAllocation and query efficiency existWhen the document is created, the DB

ObjectiveMongoDB is needed in recent projects, and this is a time to learn how to use the database.Here I first briefly introduce what is MongoDB, the following will be described in detail:MongoDB is a universal document-oriented database, with

Reference: http://blog.csdn.net/adparking/article/details/38727911MongoDB's application in the online search, very little about the traditional application of information on how to use MongoDB database content, more or to introduce the log

1. Download MongoDBAddress: "Https://www.mongodb.com/download-center?jmp=nav#atlas" seems to need to register, you can download from below"Http://dl.mongodb.org/dl/win32/x86_64"2. Installing MongoDB3. Create a database folder under the installation

I. Database-level locksMongoDB's lock mechanism and general relational database such as MySQL (InnoDB), Oracle is very different, InnoDB and Oracle can provide row-level granularity lock, and MongoDB 2.x can only provide library-level granularity

Win10 under MongoDB InstallationMongoDB is a product between a relational database and a non-relational database, and is the most versatile and most like relational database in a non-relational database.MongoDB Platforms:

//View all DatabasesShow DBS//Amdin 0.000GB//Local 0.000GB//Working with DatabasesUse admin//switched to DB admin//Create a database: Insert a record into the databaseDb.user.insert ({' name ': ' Wangxi ') })//Writeresult ({"ninserted": 1})//Show

History:MongoDB is a document-oriented database. It provides document-oriented storage.The concept of no relationship in MongoDBFunctional Features:1, support special query support regular expression search2. You can index any field in the document3,

MongoDB 3.x stores binary data in a way that is not base64, although the query results in the MONGO client are displayed in base64 manner, please feel free to use. The following analysis stores the contents of the stored file. Base64 encoded data

Here are some of the basic concepts of MongoDB: A document is a basic unit of data in MongoDB, similar to a row in a relational database. Collection, which is a container for storing documents, similar to a table in a relational

MongoDB for real-time locationDb. Callrecordinfo.find (). Count ()Db. Sendinfo.find (). Count ()Db. Riderreatimepositon.find (). Count ()Db. Distributeorderrecord.find (). Count ()Data that is greater than a certain timeDb. Riderreatimepositon.find (

Create a Student information sheet (at least includes: name, gender, score, age)1. Write 15 different data db.students.insertmany ( [ {name: "Bob", Age:16, Sex: "Male", grade:95}, {name: "Ahn", a ge:18, Sex: "Female", grade:45}, {name: "Xi", age:15

Delete data, collection, database:To delete a document:Db.media.deleteOne ({"Name": "Sky"})To delete multiple documents:Db.media.deleteMany ({"Name": "Sky"})Db.media.remove ({"Name": "Sky"})To delete a collection:Db.media.drop ()To delete a database:

Match the complete array:Create a collection (containing arrays)Db. Arraytest.insert ({name: "Sky", Address: [{"Street": "Jingke", Num:12, code:200101},{"street": "Guanglan", num:1, cod E:222201}]})Db. Arraytest.insert ({name: "Bill", Address:

1. Install after unpacking the installation packageInstallation Note: 1. Select Customs 2. Path Select a drive letter other than C driveAfter the installation is complete:2. Create a new data, log folder in the bin's sibling directory3. Create a new

Dbref:There are two ways to model MongoDB, one is inline (Embed), and the other is connection (link). Inline is a good understanding, that is, the field content is a group, the array contains the document, and we are today to introduce another,

Create the file mg.conf in the bin directory sibling directory and write the following:Dbpath=d:\program Files\mongodb\server\3.2\data #数据库路径Logpath=d:\program Files\mongodb\server\3.2\logs\mongo.log #日志输出文件路径Logappend=true #错误日志采用追加模式Journal=true

A fixed set of MongoDB fixed set refers to the pre-created, and fixed-size set. That is, if a set is fixed to 100, and then a document is added, the first document will be removed, leaving only 100 data. Fixed set properties: Fixed sets are much

Aggregation Pipeline:Common operators introduce:$project: Include, exclude, rename, and display fields$match: query, need the same parameters as find ()$limit: Limit the number of results$skip: Ignore the number of results$sort: Sort results by a