Basic operation of MongoDB

1. Turn on MongoDB service

1 sudo service MongoDB start

2. Enter the MongoDB command line interface to exit at the command line by knocking exit

1 MONGO

3.find () Basic query usage: DB. Collection_name.find ();--(the concept of a set collections in MongoDB)

In order for the query results to appear more canonical, you can use the pretty () function

Combination condition for or query

and query combination criteria (note the data type of the insert information)

Where $lte means less than or equal, $gte means greater than or equal, $ne means not equal to

Not to be continued ...

Basic operation of MongoDB