First knowledge of MongoDB

1. Very popular NoSQL database (based on Bson format, JSON extension)

2. Install, download (default port 27017)

Start Mongod--dbpath/data/db

Server-side Mongod start after the default is the listening amount of 27017 of the port, Customer service Terminal program MONGO connection server MONGO 127.0.0.1:27017--> connection success

3. Create a Database

Use dbname; (at this point, there is no real database creation, but in the preprocessing cache pool, only the actual data is added to create the data file)

4. Add a record to the corresponding database

Db. The name of the collection (equivalent to the table name in MySQL). Insert ({name: ' Ty '})

5. View all the Databases

Show DBS

6. Display all collections of documents in the corresponding database (equivalent to all tables in the MySQL database)

Show collections

7. Querying data for a specified document

Query all: DB. The name of the collection. Find () Query the first: DB. The name of the collection. FindOne ()

8 Updating document data

Db. The name of the collection. Update ({The original data)},{$set: {New Data}})

9. Delete data from a document

DB. Name in the collection. Remove ({finder})

10 deleting a collection from a database

Db. The name of the collection. Drop ()

11 Deleting a database

Db.dropdatabase ()

First knowledge of MongoDB