MongoDB

MongoDB has two roles 1 dedicated to managing User 2 Management Operations 1 MongoDB installation from the official Web download MongoDB MSI file (http://www.mongodb.org/downloads), the version I currently use is 3.0.3 (window). Double-click the MSI

#MongoDB中有三元素: A database, a collection, a document, where "set" is the "table" in the corresponding relational database, and "document" corresponds to "row". #创建数据库testdb数据库, mongos> use testdb; #查询数据库 with the following statement to show that the

Blog posts and comments For example, the blog post has a title content, corresponding to a number of comments, comments have comments, comments and other content. (1) Insert a blog post: Db.blog.insert ({'_id':' One','title':'This is blog

For the rest of the day, I will learn about MongoDB, and I will take a detailed note of the learning process. What is MongoDB? I don't think I need to explain that much. Okay, nonsense, let's go straight to the topic and see how the MongoDB

MongoDB DownloadMongoDB provides precompiled binary packages for 32-bit and 64-bit systems that you can download from the MongoDB official website, MongoDB precompiled binary package:Http://www.mongodb.org/downloads DecompressionAfter downloading

Start Mongo\bin\mongo.exe1. Add>use admin# Switch to the MONGODB database user table>db.adduser ("Name", "Password") #创建读写权限用户>db.adduser ("Name", "Password", True) #创建只读权限用户>show users# Show all users of the current libraryNote: Users of a single

Linux Platform installation MongoDB downloadMongoDB offers 32-bit and 64-bit installation packages on the Linux platform, which you can download on the website.: Http://www.mongodb.org/downloadsInstallationAfter the download is complete, unzip the

Definition:Create a database new user with the Db.createuser () method and return a user repeat error if the user exists. Syntax:db.createuser (user, Writeconcern)User This document creates identity authentication and access information about

AerospikeC client manual --- Benchmarks Benchmarks The Aerospike C client function library comes with a benchmark tool, which is built using the C client function library. Using this benchmark tool, you can:Write and read data to the database at a

AerospikeC client manual-transaction-level consistency assuranceZookeeperTransaction-level consistency is guaranteed as a distributed database. Aerospike supports automatic data replication. Most often, the database is configured to maintain two

Redis data structure (2) Dictionary The Redis dictionary is actually a Hash table. Its implementation is similar to the hashmap structure in JAVA. Key-Value pairs are stored in Key-Value mode, but there are some differences.The hashmap structure in

One-to-one and one-to-many implementations of Mybatis association query This article mainly describes how to use Mybatis to implement Association queries. There are one-to-one and one-to-many cases. Finally, we will briefly describe ResultMap.I.

ADO. NET -- DataAdapter object DataAdapter object Source and function: In the ADO. NET object I introduced earlier, such as the Connection object, Command object, and DataReader object, all of these objects belong to the Data Provider and are

Mongodb learning (Set Operations + small vue) Here, I first enter mongod--dbpath D: \ mongodbData to open the mongodb service. Enter mongo 127.0.0.1: 27017/admin to open the client. Next, I will perform the following operations:1. delete a

Solve mysql Chinese display 1. view the mysql character setting method, as shown in. If it is not gbk, perform related settings. Mysql> SET character_set_client = gbk;Mysql> SET character_set_connection = gbk;Mysql> SET character_set_database =

Obtain different scn information from controlfile and datafileheader Database checkpoint scn -- The following dump from control file: Database checkpoint: Thread=1 scn: 0x0000.0006b6fe Datafile checkpoint scn -- The following is the dump of control

PowerDesigner15.1 tips 4 PowerDesigner15.1 tips 4Read first PowerDesigner15.1 tips (1)PowerDesigner15.1 tips (2)-how to find official resourcesPowerDesigner defines cdm, ldm, and pdmThe data structure of a table is represented by a tree

Two problems encountered during impdp Import Two days ago, you need to import the data dump exported from a remote test database using expdp to a local test environment. Some problems are encountered, which is worth a summary. Environment

Generate Report statistical charts in batches In a report application, multiple statistical charts are usually displayed in a report. For example, a Statistical Chart is expanded according to a level-1 classification, and then a Statistical Chart

Getting started with Hibernate41. download the latest Hibernate2. install the Hibernate tool plug-in eclipse. Download the latest luna plug-inAfter installation, the new menu should include:3. Create a New java Project Add all jar packages in the