MongoDB's authoritative guide to MongoDB basic Knowledge learning record

Mongo

Show DBS View all databases

Using use, you can switch the database, and if there is no database, create a new

Use local to switch down the local database

Add data

Db.test.insert ({name: "Jack"}) inserts a piece of data into the test table, and if no test table is created, it is inserted in bulk if an array of documents is passed in.

BULK INSERT

Db.test.batchInsert ([{"_id": 0, "_id": 1}]) accepts an array of documents as a parameter, and if a document insertion fails during insertion, the document is inserted successfully before it and the document is not inserted.

After 3.4, I changed it.

Db.test.insertMany ()

Delete data

Db.test.remove ({name: "Jack"}) Delete all data in the test table named Jack

Find data

Db.test.find () View all data in test table

Db.test.findOne () View a single piece of data

modifying data

Db.test.update ({name: "Jack"}, {name: "Mike"}) change the data named Jack in the test table to name equals Mike

Db.test.save ({name: "Alice"}) creates a new data without the data, and then updates the

Linux creates a. Mongorc.js in the current user's home directory (/HOME/XXX).

MONGO the file is loaded before running the shell

You can override delete operations in a file to avoid deleting data

You can edit the variables in the shell after you specify editor= "/usr/bin/vim"

You can use a for loop to traverse the data in the shell

var collections = ["A", "B", "C"] for (var in collections) {    print ( Collections[i])}

A lot of the content has changed, please check the Official document address http://docs.mongoing.com/manual-zh/mongo.html

MongoDB's authoritative guide to MongoDB basic Knowledge learning record