Installation and basic operation Mongo

A. Installation

Mongo document: https://docs.mongodb.com/v3.6/administration/install-enterprise-linux/

Linux mongo's profile in general: /etc/mongod.conf

sudo apt-get install mongodb

II. Start mongodb

# Start 
sudo Service Start the mongod
 # closed 
sudo Service the mongod STOP
 # restart 
sudo service mongod restart

III. Create a user name and password

1. Create an administrator account

mongo

use admin

db.createUser(
  {
    user: "adminUserName",
    pwd: "adminPassWord",
    roles: [ { role: "userAdminAnyDatabase", db: "admin" } ]
  }
)

2. Create a common account

mongo

use test

db.createUser(
  {
    user: "simpleUserName",
    pwd: "simplePassWord",
    roles: [ { role: "readWrite", db: "test" },
             { role: "read", db: "test2" } ]
  }
)

# Permissions: read-write database test, read-only database test2.

IV. Connection

# Local connection 
mongo
 # connection username password mongo 
mongo -u " the User " -p " password " 
# connection to the remote mongo 
mongo ip 

# connection to the remote username password specified database mongo 

1 . Username and password directly connected 
mongo ip / DB -u ' User ' -p ' password ' 

Example: Mongo 127.0.0.1/admin -u " the root " -p " the root " 

2 . connect the remote client during authentication 
Mongo IP 

use ADMIN 
db.auth ( " adminUser ", "adminPass")

V. Basic Operations

1. Common Operation

# View all databases 
Show dbs 

# into the test database is created not 
use test 

# Create a table 
db.createCollection ( " Reviews " ) 

# under the table to see test 
Show the Tables

2. Basic Query

# View test strip total number of reviews under the table 
db.reviews.count () 
or 
db.reviews.find (). COUNT () 

# before the query 10 
db.reviews.find (). Limit (10 ) 

# before skipping 10, query 10 
. db.reviews.find () Skip (10) .limit (10 ) 

# query data _id 1 
db.reviews.find ({ " _id " : 1})

3. Insert Data

db.COLLECTION_NAME.insert(document)

# Insert a data table reviews 
db.reviews.insert ({ " the _id " :. 1 }) 
Results: WriteResult ({ " nInserted " :. 1 }) 

# insert multiple 
db.reviews.insert ([{ " the _id " : 2} , { " the _id " :. 3 }]) 
results: BulkWriteResult ({ 
    " writeErrors " : [],
     " writeConcernErrors " : [],
     " nInserted " : 2 ,
     " nUpserted " : 0,
    "nMatched" : 0,
     " nModified " : 0,
     " nRemoved " : 0,
     " upserted " : [] 
}) 

# Note _id inserted already exists, the error will be

4. Delete

If your MongoDB version 2.6 later, the syntax is as follows:

db.collection.remove( <query>, { justOne: <boolean>, writeConcern: <document> } )

Parameter Description:

Query :( Optional) condition for the document to delete.
justone : (optional) If true or 1, only delete a document, if you do not set this parameter, or use the default value is false, all documents matching conditions are deleted.
writeConcern :( optional) throw-level exception.

# Delete databases, caution 
use Test 
db.dropDatabase () 

# remove reviews table 
db.reviews.drop () 

# data deletion reviews qualifying 
db.reviews.remove ({ " the _id " :. 1 }) 

# delete only the first a qualified data 
db.reviews.remove ({ " _id " : 1}, 1 ) 

# delete all data 
db.reviews.remove ({})

5. Update Data

update () method is used to update the existing document. Syntax is as follows:

db.collection.update( <query>, <update>, { upsert: <boolean>, multi: <boolean>, writeConcern: <document> } )

Parameter Description:

Query : query update, similar to the back where within sql update query.
Update : Update objects and some of the newer operators (e.g., $, $ inc is ...) and the like, may be understood as a set behind the sql update query
upsert : Optional, this parameter mean, if there is no record update, whether to insert objNew, true inserted, the default is false, not inserted.
Multi : Optional, mongodb default is false, only updating the first record found, if this parameter is true, according to the conditions put many records to check out all the updates.
writeConcern : Optional, throw-level exception.

#   Update _id: data updates status 3. 1 
db.reviews.update ({ " the _id " :. 3}, {$ SET: { " Status " :. 1 }}) 
Results: WriteResult ({ " nMatched " :. 1, " nUpserted " : 0, " nModified " :}. 1)

If wrong, please share

Installation and basic operation Mongo

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