CODEWITHSUNDEEP
javascriptmongodbexpress
user2422960
user2422960

Reputation: 1526

MongoDB / Express - How to switch database after connecting via connect()

I am using express to connect to my mongoDB:

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

      // How would one switch to another database here?

});

I have to connect to the admin database in the first place. After the conenction has been established, i would like to switch the database.

Although i have searched through the official documentation, i was unable to find something that fits my needs.

I am aware of the MongoClient::open() method, but i would like to stick to connect().

Any help is appreciated.

Upvotes: 6

Views: 5528

Answers (2)

robertklep
robertklep

Reputation: 203554

You can switch to another database like so:

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

(docs)

EDIT: for clarification: this also allows you to open multiple databases over 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 use both `database` and `database2`
  ...
});

Upvotes: 12

heinob
heinob

Reputation: 19474

You just have to call MongoClient.connect once again, because there is one connection per database. That means, you cannot change the database of an existing connection. You have to connect a second time:

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

Upvotes: 1

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