dropCollection

Drop MongoDB collection

Syntax

dropCollection(conn,collection)

Description

example

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

Examples

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Connect to MongoDB and drop a collection.

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

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

  mongo with properties:

               Database: 'mongotest'
               UserName: ''
                 Server: {'dbtb01'}
                   Port: 27017
        CollectionNames: {'airlinesmall', 'employee', 'largedata' ... and 3 more}
         TotalDocuments: 23485919

conn is the mongo 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 six document collections. The first three collection names are airlinesmall, employee, and largedata.

  • This database contains 23,485,919 documents.

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 =

  1×7 cell array

  Columns 1 through 5

    {'airlinesmall'}    {'employee'}    {'largedata'}    {'nyctaxi'}    {'product'}

  Columns 6 through 7

    {'restaurants'}    {'taxidata'}

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 =

  1×7 cell array

  Columns 1 through 5

    {'airlinesmall'}    {'employee'}    {'largedata'}    {'nyctaxi'}    {'product'}

  Columns 6

    {'restaurants'}    

Close the MongoDB connection.

close(conn)

Input Arguments

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MongoDB connection, specified as a mongo object.

Collection name, specified as a string scalar.

Example: "taxidata"

Data Types: string

Introduced in R2017b