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

1. After performing mongod.exe server startup, you can follow the parameters to describe the database and logs that are started.

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 the current database: db.dropDatabase ()

Switch to database: use DATABASE_NAME

Delete collection: db.collection.drop ()

MongoDB uses the insert () or save () methods to insert documents into the collection:

Db.COLLECTION_NAME.insert (document)

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

The update () method is used to update existing documents. The syntax format is as follows:

Db.collection.update (

, / / query: the query condition of update, which is similar to that after where in the sql update query.

, / / update: the object of update and some updated operators (such as $, $inc...), etc., can also be understood as the following set in the sql update query

{

Upsert: / / upsert: optional, this parameter means that if there is no record of update, whether to insert objNew,true is insert, default is false, do not insert.

Multi: / / multi: optional. Mongodb defaults to false. Only the first record found is updated. If this parameter is true, all records found by condition will be updated.

WriteConcern: / / writeConcern: optional, the level at which the exception is thrown.

}

)

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

Db.collection.save (

{

WriteConcern:

}

)

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

MongoDB deletes a document

Parameter description:

Document: document data.

WriteConcern: optional, the level at which the exception is thrown.

The basic syntax format of the remove () method is as follows:

Db.collection.remove (

)

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

The syntax format of MongoDB query data is as follows:

Db.COLLECTION_NAME.find ()

Read data in a readable manner

Db.col.find () .pretty ()

Similar statements in the example RDBMS of the action format

Equals {:} db.col.find ({"by": "Rookie tutorial"}) .pretty () where by = "Rookie tutorial"

Less than {: {$lt:} db.col.find ({"likes": {$lt:50}}) .pretty () where likes

= 50

Not equal to {: {$ne:} db.col.find ({"likes": {$ne:50}}) .pretty () where likes! = 50

The conditional operators in MongoDB are:

(>) greater than-$gt

(=) greater than or equal to-$gte

(100)

I wrote down the above while typing the website myself.

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