MongoDB authoritative Guide to Learning Notes (2)-Getting Started

The concept comparison between MongoDB and relational database:

                         MongoDB                relational database
                          document                       row
                          collection                       table
                          instance                    n Database

1. Documentation

Document: Multiple keys and their associated values are placed together in an orderly manner. JS, the document is represented as an object.

{"Key": "Value"}
{"Name": "Zhangsan", "Age": 20}

2. Collection

Collection: A set of documents is a collection. Collections are modeless (different types of documents can be in a collection). To enhance flexibility and ease of management, you need to create a pattern to bring together documents of the relevant type.

Specification for collection naming: non-null, not "system." Beginning Non-$

3. Database

Namespace (fully qualified name): Database name. Collection name. Subset Name

4. Start, use 27017 port

ubuntu:$./mogod
Windows:mogod.exe

5. Run the shell

$./mongo

6.shell command

Select Database

>use Foo

Create

>db.user.insert ({"Name": "Zhangsan", "Age": 20})

Read

>db.user.find ()

Update

>db.user.update ({"Name": "Zhangsan"},{"gender": "Male"})

Delete

>db.user.remove ({"Name": "Zhangsan"})

Data type ('-' means not supported in shell)
Null Boolean; 64 floating point; string;
Symbol-; object ID; A date; a regular expression;
JS code; Binary data-; maximum/small value-;
Not defined; an array; an inline document.