mongodb insert if not exists

A brief introduction to 1.1 MongoDBIn today's database market, MySQL is undoubtedly a place to occupy. As an open-source relational database , MySQL is widely used in the background of major web sites, and assumes the important role of information

A brief introduction to 1.1 MongoDBIn today's database market, MySQL is undoubtedly a place to occupy. As an open-source relational database , MySQL is widely used in the background of major web sites, and assumes the important role of information

Directory Brief introduction MongoDB installation (Windows) Getting Started with MongoDB basic syntax and operations (Mongo.exe client operations) Library operations Insert Inquire Modify Delete

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

If you have never been familiar with MongoDB or have a little understanding of MongoDB, if you are a C # developer, take a few minutes to read this article. This article will take you step by step to get started easily. Read directory 1:

Directory Brief introduction MongoDB installation (Windows) Getting Started with MongoDB basic syntax and operations (Mongo.exe client operations) Library operations Insert Inquire Modify Delete

MongoDB is a document-oriented database, which is currently developed and maintained by 10gen. It has rich functions and is complete and can completely replace MySQL. In the process of using MongoDB as a product prototype, we summarized some

In the data stored in the database, there is a special key value called the primary key , which is used to uniquely identify a record in the table. In other words, a table cannot have more than one primary key, and the primary key cannot be a null

Environment: Linux: Redhat or CentOS MONGODB installation mode 1: Install MONGODB by configuring Yum, Enterprise Edition and generic version: Not much, just look at the document [root@dominic5 ~]# Ping www.baidu.com PING www.a.shifen.com (180.97.33.7

MongoDB's library-level lockMongoDB is currently the most popular NoSQL database, with its natural document-type data structures, flexible data patterns, and easy-to-use horizontal scaling capabilities that have been favored by many developers. But