mongodb subdocument example

A MongoDB Introduction:by querying some information on the Internet to introduce the advantages of MongoDB :MongoDB is a document-oriented database, currently developed and maintained by 10gen, it is rich in functionality, complete, can completely

1. PrefaceIn this blog post, we will learn how to query the data in MongoDB. When we store the data in MongoDB, we need to query the data. After all, the query operation in the crud operation is our most frequently used operation in our system. We

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 MongoDB, the Db.collection.find () method is used to retrieve documents from the collection. The Db.collection.find () method returns a cursor that retrieves the document. The Db.collection.findOne () method also performs a read operation,

The advantages of MongoDB compared to relational databases:① Weak consistency (eventually consistent), to ensure the user's access speed:For example, in a traditional relational database, a count type of operation locks the dataset so that the exact

The advantages of MongoDB compared to relational databases:① Weak consistency (eventually consistent), to ensure the user's access speed:For example, in a traditional relational database, a count type of operation locks the dataset so that the exact

compared to relational database, the advantages of MongoDB: reprinted from Http://blog.sina.com.cn/s/blog_966e430001019s8v.html① Weak consistency (eventually consistent), to ensure the user's access speed:For example, in a traditional relational

The advantages of MongoDB compared to relational databases:① Weak consistency (eventually consistent), to ensure the user's access speed:For example, in a traditional relational database, a count type of operation locks the dataset so that the exact

The advantages of MongoDB compared to relational databases:① Weak consistency (eventually consistent), to ensure the user's access speed:For example, in a traditional relational database, a count type of operation locks the dataset so that the exact

The advantages of MongoDB compared to relational databases:① Weak consistency (eventually consistent), to ensure the user's access speed:For example, in a traditional relational database, a count type of operation locks the dataset so that the exact