dropCollection

Drop MongoDB collection

Since R2021b

Syntax

dropCollection(conn,collection)

Description

dropCollection(conn,collection) drops an existing collection from MongoDB^® by using the MongoDB C++ interface connection.

Examples

Drop Collection in MongoDB

Connect to MongoDB® using the MongoDB C++ interface and drop an existing collection.

Create a MongoDB connection to the database mongotest using the MongoDB C++ interface. Here, the database server dbtb01 hosts this database using port number 27017.

server = "dbtb01";
port = 27017;
dbname = "mongotest";
conn = mongoc(server,port,dbname)

conn = connection with properties:
           Database: "mongotest"
           UserName: ""
             Server: "dbtb01"
               Port: 27017
    CollectionNames: [14×1 string]

conn is the connection object that contains the MongoDB connection. The object properties contain information about the connection and the database.

• The database name is mongotest.

• The user name is blank.

• The database server is dbtb01.

• The port number is 27017.

• This database contains 14 document collections.

Verify the MongoDB connection.

isopen(conn)

ans = logical
   1

The database connection is successful because the isopen function returns 1. Otherwise, the database connection is closed.

Display the collections in the database before dropping a collection by using the CollectionNames property.

conn.CollectionNames

ans = 14×1 string
    "dateissue"
    "product"
    "timestamps"
    "restaurants"
    "employees"
    "bsontest"
    "taxidata"
    "airlinesmall"
    "largedata"
    "patients"
    "genderMeanAge"
    "escalation"
    "nyctaxi"
    "tsunamis"

Drop an existing collection from the database by using the MongoDB connection. Specify the collection name taxidata.

collection = "taxidata";
dropCollection(conn,collection)

Display the collections in the database again by using the CollectionNames property. The database no longer contains the collection taxidata.

conn.CollectionNames

ans = 13×1 string
    "dateissue"
    "product"
    "timestamps"
    "restaurants"
    "employees"
    "bsontest"
    "airlinesmall"
    "largedata"
    "patients"
    "genderMeanAge"
    "escalation"
    "nyctaxi"
    "tsunamis"

Close the MongoDB connection.

close(conn)

Input Arguments

conn — MongoDB C++ interface connection

connection object

MongoDB C++ interface connection, specified as a connection object.

collection — Collection name

string scalar

Collection name, specified as a string scalar.

Example: "taxidata"

Data Types: string

Version History

Introduced in R2021b