Basic operations for MONGODB databases and collections

Non-relational database

• command is case-sensitive; command Terminator is carriage return (unlike MySQL)

MongoDB Configuration

• sudo service mongodb start
• mongo

MongoDB Basic Concept

• 集合
  A concept that corresponds to a relational database 表 , creating a collection: db.createCollections("<集合名>") ; Deleting a collection: db.<集合名>.drop() ; getting all the collections:show collections
• 文档
  The concept of a relational database 记录 , MongoDB's documentation, is represented by the bson loosely structured data structure of the class JSON (JSON-upgraded version)
  Inserting a document into the collection
  1. Useinsert()
  e.g.:db.<集合名>.insert([{name:"hello",email:"[email protected]"},{name:"world",email:"[email protected]"}])
  2. Use save() (note with the Insert () difference, save () when inserting data, the collection will be created automatically if the collection does not exist)
  e.g.:db.<集合名>.save([{name:"hello",email:"[email protected]"},{name:"world",email:"[email protected]"}])
• 数据库
  1. Create a database:use <数据库名>
  2. View the currently connected database:db
  3. View all databases:show dbs
  4. Destroy the database: switch to the database that you want to destroy, and then executedb.dropDatabase()

Basic operations for MONGODB databases and collections