How to query mongoDB in node.js from a function?

Question

The functions for connecting to and querying a mongodb database (I'm assuming most types of databases, by the nature of node) are non-blocking. How do I write a function to get the results of a query in, say, a JSON object? the function should manage the querying and block until the query is returned.

Basically I want to be able to do something like this:

http.createServer(function(request,response){

   var searchQuery = parseQueryFromUrl(request.url);
   var searchResults=queryDatabase(searchQuery);
   var document = renderFile(fileTemplate,searchResults);
   response.writeHead(200);
   response.write(document);
   response.end();

});

Is this possible?

This has been asked/answered many times before. What didn't make sense? Node is async, so you'll need to use callbacks, or an object layer like Mongoose which can also expose Promises. — WiredPrairie
– WiredPrairie, Commented Apr 27, 2014 at 20:46

knowbody · Accepted Answer · 2014-04-27 20:29:18Z

1

writing from the phone, here quick answer, will edit when I get home later:

router.get('/search/*', function(req, res, term){
  res.writeHead(200, {'Content Type:':'text/plain'});
  var db = new mongo.Db('dbname', server);
  db.open(function(err, db){
    db.createCollection("collection_name", function(err, collection){
      db.collection('foo').find({'a':term}).toArray(function(err, items){
        console.log(items);
      });
    });
  });
});

here more about queries: http://mongodb.github.io/node-mongodb-native/markdown-docs/queries.html

answered Apr 27, 2014 at 20:29

knowbody

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2 Comments

Christopher Shroba Over a year ago

Thank you! But I'm trying to put the whole db.open(...) function in another function to add some abstraction, to keep the code cleaner. Is that possible?

knowbody Over a year ago

can you edit your question and show what you have so far? and yes it is possible

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