fruitstand/examples/nodejs-mongodb-angularjs-web-development/ch13/db_connect_string.js

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var MongoClient = require('mongodb').MongoClient;
MongoClient.connect("mongodb://dbadmin:test@localhost:27017/test", {
                      db: { w: 1, native_parser: false },
                      server: {
                        poolSize: 5,
                        socketOptions: { connectTimeoutMS: 500 },
                        auto_reconnect: true
                      },
                      replSet: {},
                      mongos: {}
                    }, function(err, db) {
  if(err){
    console.log("Connection Failed Via Connection String.");
  } else {
    console.log("Connected Via Connection String . . .");
    db.logout(function(err, result) {
      if(!err){
        console.log("Logged out Via Connection String . . .");
      }
      db.close();
      console.log("Connection closed . . .");
    });
  }
});