Basic operation of MongoDB

1, create a new database

Use Db_name

If it does not exist, the new

2. Querying all databases

Show DBS

3. Delete Database

After entering this database

Db.dropdatabase ()

4. Insert collection data into a database

The collection of MongoDB is equivalent to table in the RDB

Insert a piece of data

Db. Collection_name.insert (Bson data)

5. Update a collection data

Db.collection.update (
<query>,
<update>,
{
Upsert: <boolean>
Multi: <boolean>
Writeconcern: <document>
}
)

Basic operation of MongoDB