Shulou(Shulou.com)06/01 Report--

1. View the collection

Show collections

two。 Add data to the collection

Db.runoob.insertMany ([

{

'title':'data1'

'url':' https://blog.51cto.com/suyanzhu',

'description':'this is data1'

'view':5000

}

{

'title':'data2'

'url':' https://blog.51cto.com/suyanzhu',

'description':'this is data2'

'view':3650

}

{

'title':'data3'

'url':' https://blog.51cto.com/suyanzhu',

'description':'this is data3'

'view':9527

}

])

3. Add data to the collection

Db.runoob.insert ({

Title: 222

Description: 'mongodb'

By: 'suyanzhu'

Url: 'https://blog.51cto.com/suyanzhu',

Tags: ['php','mongodb']

Likes: 200

})

4. View all data

Db.runoob.find () .pretty ()

5. Only title key data is returned

Db.runoob.find ({}, {'title':1,'_id':0}) .pretty ()

6. Only 2 pieces of data in the result are returned.

Db.runoob.find ({}, {'title':1,'_id':0}) .pretty () .limit (2)

The 7.limit method has no parameters to return all data

Db.runoob.find ({}, {'title':1,'_id':0}) .pretty () .limit ()

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