mongodb query inner document

Install and configure MongoDB in Linux1. MongoDB simple description A MongoDB is an open-source database system written in C ++ Based on Distributed File storage. It aims to provide scalable and high-performance data storage solutions for WEB

1. find MongoDB uses find for query. The query is to return a subset of the documents in a collection. The range of the child set is from 0 documents to the first parameter of the entire set. find. Determines which documents are to be returned. The

This paper introduces the JSP programming technology to achieve a simple shopping cart program, specific as follows: 1 Problem description Using JSP programming technology to achieve a simple shopping cart program, the specific requirements are as

We design relational database schemas with a complete set of solutions, but NoSQL does not. Half a year ago I read this "SQL anti-mode" book, feel very good. Just start to notice, is there an inverse pattern for nosql? A good counter pattern can be

Data model and Base operation templateIn order to make the engineering structure clear, the establishment of data Model (SCHEMA) and the base operation template of adding and deleting and modifying are named as collection in database design

MongoDB Index Command Summary1. Create an index on a key of the document in the collection: 1. We know that if the index is used properly, the query speed will be greatly improved. If the index is used improperly, the performance of the entire

Full-Text IndexingBuild method:--Create a full-text index on the key field of the articles collection Db.articles.ensureIndex ({key: "text"})--Key_1,key_ in the articles collection 2 Create full-text index on field db.articles.ensuereIndex ({key_1: "

Continue to learn MongoDB, the main content of this study is to use the modifier to complete the local update operation1. $setUsed to specify a key-value pair, which is modified if there is a key, and is added if it does not existDb.person.update ({"

Inserting a document (inserting a database)Db.person.insert ({_id: "0001", Name "Yuexin"})Clear DataDb.person.drop ()Bulk INSERT DocumentBulk INSERT not supported in shellComplete BULK INSERT using for loopfor (Var i=0;i.. Db.persons.insert

Insert document (insert database) db. person. insert ({_ id: 0001, nameyuexin}) to clear the data db. person. drop () Batch insert document shell does not support batch insert to complete batch insert use for loop (vari0; i10; I ++ ){.. db. persons.