Switching Databases in MongoDB after establishing a connection using Express - A guide

I am currently using Express to establish a connection with my MongoDB database:

mongodb.MongoClient.connect(mongourl, function(err, database) {

      // Is there a way to switch to another database at this point?

});

In the initial setup, I have to connect to the admin database. However, once the connection is made, I need to switch to a different database.

Despite doing extensive research in the official documentation, I couldn't find a solution that aligns with my requirements.

While I am familiar with the MongoClient::open() method, I prefer to stick with using connect().

Any assistance on this matter would be greatly appreciated.

javascriptmongodbexpress

Answer №1

If you need to change to a different database, you can do so by following these steps:

mongodb.MongoClient.connect(mongourl, function(err, database) {
  // switch to another database
  database = database.db(DATABASE_NAME);
  ...
});

(docs)

UPDATE: just to clarify, this method also enables you to access multiple databases using the same connection:

mongodb.MongoClient.connect(mongourl, function(err, database) {
  // open another database over the same connection
  var database2 = database.db(DATABASE_NAME);

  // now you can work with both `database` and `database2`
  ...
});

Answer №2

If you need to switch databases, you will have to make a new connection using the MongoClient.connect method once more. Each database requires its own unique connection, so it is not possible to change the current connection's database. Here is an example of how you can connect to a different database:

mongodb.MongoClient.connect(mongourl, function(err, database) {
    mongodb.MongoClient.connect(mongourl_to_other_database, function(err, database2) {
        // You can now use either database or database2
    });
});

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