MongoDB Simple operation

1. Perform Mongod.exe server startup database and log that can be followed by parameter description.

eg

Mongod.exe--bind_ip 127.0.0.1--logpath "F:\data\dbConf\mongodb.log"--logappend--dbpath "F:\data\db"--port 19901-- ServiceName "MONGODB1"--servicedisplayname "Mongodball"--install

2. Perform Mongo.exe Client connection

View all databases: Show DBS

Syntax format for creating a database: Use database_name

Delete Current database: Db.dropdatabase ()

Switch to database: use database_name

Delete collection: Db.collection.drop ()

MongoDB uses the Insert () or Save () method to insert a document into the collection:

Db. Collection_name.insert (document)

MongoDB uses the update () and Save () methods to update the documents in the collection:

The update () method is used to update a document that already exists. The syntax format is as follows:

Db.collection.update (

<query>,//query:update the query condition, similar to the SQL update query inside the where.

<update>,//update:update objects and some updated operators (such as $, $inc ... ) can also be understood as the SQL update query within the set after the

{

Upsert: <boolean>,//upsert: Optional, this parameter means that if there is no record of update, insert objnew,true as INSERT, default is False, do not insert.

Multi: <boolean>,//multi: Optional, mongodb default is False, only update the first record found, if this parameter is true, the condition is checked out all the records are updated.

writeconcern: <document>//writeconcern: Optional, throws an exception level.

 }

)

The Save () method replaces an existing document with an incoming document. The syntax format is as follows:

Db.collection.save (

<document>,

{

Writeconcern: <document>

 }

)

Db.col.update ({' title ': ' MongoDB Tutorial '},{$set: {' title ': ' MongoDB '}})

MongoDB Delete Document

Parameter description:

Document: Documentation data.

Writeconcern: Optional, throws an exception level.

The basic syntax format for the Remove () method is as follows:

Db.collection.remove (

<query>,

<justOne>

)

Remove all data: Db.col.remove ({})

The syntax format for MongoDB query data is as follows:

Db. Collection_name.find ()

Read data in an easy-to-read manner

Db.col.find (). Pretty ()

Action format example of a similar statement in an RDBMS

equals {<key>:<value>}Db.col.find ({"By": "Rookie Tutorial"}). Pretty ()where by = ' Rookie Tutorial '

Less than {<key>:{$lt: <value>}} db.col.find ({"likes": {$lt:)}. Pretty () Where likes < 50

Less than or equal to {<key>:{$lte: <value>}} db.col.find ({"likes": {$lte:]}). Pretty ( ) where likes <= 50

Greater than {<key>:{$gt: <value>}} db.col.find ({"likes": {$gt:}}). Pretty ()where Likes > 50

Greater than or equal to {<key>:{$gte: <value>}} db.col.find ({"likes": {$gte:]}). Pretty ( ) where likes >= 50

Not equal to {<key>:{$ne: <value>}} db.col.find ({"likes": {$ne:}}). Pretty ()where Likes! = 50

The condition operators in MongoDB are:

(>) Greater than-$GT

(<) less than-$lt

(>=) greater than or equal to-$gte

(<=) less than or equal to-$lte

Db.col.find ({"likes": {$gt: 100}})

Similar to the SQL statement:

Select * from Col where likes > 100;

The above is I watch the site on the side of the record down.

This article is from "Walking Taihang Yan Zhao" blog, please be sure to keep this source http://chaoslee.blog.51cto.com/10643967/1856759

MongoDB Simple operation