mongodb make field unique

This is a creation in Article, where the information may have evolved or changed. This address: https://linux.cn/article-9006-1.html2017-10-28 20:18 favorites: 1 October 20, the New York-based MongoDB listed on the Nasdaq, closed on the same day at

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:

Document directory MongoDB Introduction Add the mjorm Library to the Project Create pojo Create an XML ing File Integration MongoDB Introduction Currently, there are many competing nosql products, which are used in different ways, but can

First, the index introductionIn MongoDB, indexes are used to support efficient queries. If there is no index, MONGODB must scan each document in the entire collection to find a matching document. However, if an appropriate index is established,

Use MongoDB in Python applications and mongodb in python applications Python is a powerful programming language used in many different types of applications in the development community. Many people know that it is a flexible language that can

In a single statistic, I used the group in MongoDB to summarize a record number 100W table. The result is an unexpected message. Error in executing GroupByCommand ' group ' failed:exception:group () can ' t handle more than 20000 unique keys

0) MONGO: Connect MongoDB database via client1) Show DBS---Display the currently created database2) Use test---Create or switch databases3) Db.dropdatabase ()--Delete the current database3) Show Collections: Displays the collection created by the

Statement: The article is mainly from the "MongoDB actual Combat" a book, the main want to learn MongoDB knowledge through the book, deepen understanding, so write in their own blog, as a record, in the final chapter, there will be a collection of

1 MongoDBMongoDB is written by the C + + language and is an open source database system based on distributed file storage. With high performance, high availability, and automatic scalability. MongoDB stores data as a document and data structures