mongodb cursor not found

Learning MongoDB 6: MongoDB query (cursor operation, cursor information) (3), mongodb cursorI. Introduction Db. collection. find () can be used to query based on conditions and specify fields returned using the projection operator to omit this

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

MongoDB is a well-known NoSQL document database, while Spring is a well-known open-source framework in the Java field. In addition to the IoC and AOP components that constitute the core of Spring, Spring also has a large number of sub-frameworks

The MongoDB PHP client has a Mongocursor class that is used to get a handle (or cursor) for a query result set, and this simple fetch operation, the internal implementation is actually not that simple. This article analyzes some operations of the

The MongoDB PHP client has a Mongocursor class that is used to get a handle (or cursor) for a query result set, and this simple fetch operation, the internal implementation is actually not that simple. This article analyzes some operations of the

Transferred from: http://www.cnblogs.com/cswuyg/p/4355948.html1. Count Statistics result errorThis is because the distributed cluster is migrating data, which results in a count result value error and requires the use of aggregate pipeline to obtain

Comments: The use of MongoDB still needs to focus on design, or even higher user requirements, rather than the opposite; MongoDB protocol problems, this may not be simple redis during c ++ code integration; however, the MongoDB communication

About MongoDBMongoDB is lighter and more flexible than some relational databases, and is ideal for use in situations where data is large and transactional is not strong. It is also an object database with no concepts such as tables, rows, or fixed

1. PrefaceIn the previous article, we introduced MongoDB. Now, let's look at how to do a regular crud operation in MongoDB. After all, as a storage system, it is the basic function of the data to be increased and censored operation.The additions and

The recent year is busy with data processing related work, with MongoDB very much, the following is the practice process of q&a, follow-up will not be updated regularly. 1. Count Statistics result errorThis is because the distributed cluster is