update

Connect to MongoDB® using the MongoDB C++ interface and update documents in a collection. Find documents to update by using a MongoDB query. Specify the criteria for the update by using a MongoDB query. In this example, the collection represents employee data.

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: [13×1 string]

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

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.

Specify the employees collection. Create a MongoDB query to find employees in the department where the department identifier is set to 90. Then, create a MongoDB query to increase the value in the salary field by 5000.

collection = "employees";
findquery = "{""department_id"":90}";
updatequery = "{""$inc"":{""salary"":5000}}";

Increase the salaries for all employees in the department using the MongoDB connection. The update function updates four documents in the collection.

n = update(conn,collection,findquery,updatequery)

n = int64
    4

Close the MongoDB connection.

close(conn)