mongodb update multiple subdocuments

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

[From: http://like-eagle.iteye.com/blog/850401]   Compared with relational databases, MongoDB has the following advantages:① Weak consistency (eventual consistency) ensures the user access speed:For example, in a traditional relational database, a

Compared with relational databases, MongoDB has the following advantages:① Weak consistency (eventual consistency) ensures the user access speed:For example, in a traditional relational database, a COUNT operation locks the dataset to ensure that

MongoDB Database Introduction Characteristics For collection Storage Rich query Statements Replication set mechanism Support for file storage Mode freedom Multilevel index Easy Horizontal

At the beginning of the project design, I had this idea, but also in the following conditions to meet the situation to choose the final NoSQL program: 1, the demand changes frequently: develops to be more agile, the development cost and the

12 months with MongoDB Happy Monday everyone! As previusly blogged, wordnik is a heavy user of 10gen's MongoDB. one year ago today we started the investigation to find an alternative to MySQL to store, find, and retrieve our corpus data. after

MongoDB does not have features that are common in relational databases, such as connectivity and complex multi-line transactions.The collection--document-->ID ID is unique within the collection to which the document belongs.Db.help () View Help at

ByTrishaGee, rule. Fornewusers, it 'orortanttoprovideanoverviewofhowtoworkwiththemongodbjavadriverandhow By Trisha Gee, Java Engineer and Advocate at MongoDB Java is one of the most popular programming languages in the MongoDB Community. for new

That's not true.Collection's single doc has a size limit and is now 16MB, which makes it impossible for you to rub everything into a Collection. And if the collection structure is too complex, it will affect the efficiency of query and update, and

Organize fromHttps://www.shiyanlou.com/courses/running/78Overwrite index queryAll query fields are part of the index, and all query return fields are in the same index.Because the index exists in RAM, getting data from the index is faster than