mongodb array not empty

The blog has moved Https://www.tianmingxing.com MongoDB is an open-source, document-oriented NoSQL (not only SQL) database written using C + +, and one of the most popular NoSQL databases. NoSQL Introduction NoSQL means "Not just SQL", is the

Copy Code code as follows: /** * PHP Operation MongoDB Learning Notes */ //************************* * * Connect MongoDB database **// //************************* Format => ("mongodb://Username: password @ address: Port/default

official website http://www.mongodb.org1, download Mongodb-win32-i386-latest.zip decompressionMongoDB 3.1.5 requires win7 to download and install memory patches HTTPS://SUPPORT.MICROSOFT.COM/ZH-CN/HOTFIX/KBHOTFIX?KBNUM=2731284KBLN=ZH-CN2, extract to

MongoDB is a document database, and each document (DOC) represents a record of the data. Instead of the relational DB row can only use simple data types, doc can use complex data types: inline doc, arrays. An array of MongoDB is a collection of

When it comes to MongoDB's architecture, it is inevitable to compare it with relational databases. Here we take MySQL for example, we make some comparisons:From the logical structure of the comparison: MySQL Hierarchy concept

MongoDBIt is a high-performance, open-source, non-pattern document-type database developed using C ++. It is a popular nosql database, in many scenarios, it can be used to replace traditional relational databases or key/value storage

MongoDB Practice Notes for beginners-install, create databases, save and query data, and learn mongodb MongoDB is a scalable and High-Performance Distributed Document storage database written in C. It is designed to provide scalable and

ConceptMongoDB is a cross-platform, document-oriented database that delivers high performance, high availability, and scalability. MongoDB work in the collection and document concept. What is NoSQL?NOSQL, the full name is not just SQL, refers to

In the previous article, we talked about MongoDB installation and management, which involves some concepts, data structures, and some API calls. It doesn't matter if you don't know it. It's actually very simple. This article will briefly introduce

I. Description 1, the study of the series MongoDB learning environment using the MongoDB version of mongodb-win32-i386-2.4.6, operating system for Win7. Second, installation 1, new two directories, respectively,