Database Commands - (Database and Collection Commands)

MongoDB provides a set of database and collection commands that allow you to perform various operations on your databases and collections. In this page, we will discuss some of the most commonly used MongoDB database and collection commands.

Syntax

The command collection in MongoDB contains all the database and collection commands. To execute a command, you can use the runCommand() helper method or call the command directly on the database or collection, depending on the command.

Here is the syntax for running a command using the runCommand() helper method:

db.runCommand({command: value})

And here is the syntax for calling a command on a database or collection:

db.collection.command({param1: value1, param2: value2, ...})

Example

Here are some examples of commonly used MongoDB database and collection commands.

Create Collection Command

The create command is used to create a new collection in a MongoDB database.

db.createCollection("mycollection")

Drop Collection Command

The drop command is used to remove a collection from a MongoDB database.

db.mycollection.drop()

Insert Command

The insert command is used to insert new documents into a MongoDB collection.

db.mycollection.insert({name: "John", age: 25})

Find Command

The find command is used to retrieve documents from a MongoDB collection.

db.mycollection.find({age: {$gt: 21}})

Update Command

The update command is used to update documents in a MongoDB collection.

db.mycollection.update({name: "John"}, {$set: {age: 26}})

Remove Command

The remove command is used to remove documents from a MongoDB collection.

db.mycollection.remove({age: {$gt: 30}})

Output

The output of each MongoDB database and collection command varies depending on the command and the operation being performed. All MongoDB commands return a document with a status property that indicates the success or failure of the command.

Explanation

MongoDB database and collection commands provide a way to manage, query, and manipulate your data in a MongoDB database. These commands provide a powerful and flexible interface for working with MongoDB.

Use

MongoDB database and collection commands can be used to perform a wide variety of operations on your MongoDB data. You can use these commands to create and drop collections, insert and retrieve documents, update and remove documents, and perform aggregations and analyses on your data.

Important Points

• MongoDB commands are located in the command collection.
• You can execute a command using the runCommand() helper method or by calling the command directly on the database or collection.
• MongoDB commands provide a flexible and powerful interface for working with your MongoDB data.

Summary

In this page, we discussed some of the most commonly used MongoDB database and collection commands. We covered the syntax, example, output, explanation, use, important points, and summary of MongoDB database and collection commands. By using these commands, you can manage, query, and manipulate your MongoDB data with ease and flexibility.