express connect to mongodb database

The mongodb database is a non-relational database (nosql) stored in the form of files. Mongodb does not have the concept of rows and tables in relational databases, but has a similar concept of document collections. A document is the most basic unit of MongoDB. A collection is the sum of multiple documents, a collection has multiple documents, and a database has multiple collections.

Install the database before connecting to the database: The following is the installation database for the linux (64-bit) platform:

First go to the official website to download the mongodb version suitable for your computer: http://www.mongodb.org/downloads

After downloading the installation package, unzip it, and extract the installation package to the specified path. Then change the name to mongodb.

I decompress it to the /usr/local/ directory.

Set environment variables:

The executable file of mongodb is in the bin directory, you can set it to the path path:

export PATH=</usr/local/mongodb>/bin:$PATH

You can enter the command in the terminal: ./mongo to see if you have mongodb installed.

Step 2: Create a new folder blog (your project name) in mongodb and create a folder mongodb under /var/log/ to store the log, then enter the bin directory and enter the command at the terminal:

./mongod --dbpath=/usr/local/mongodb/blog/ --port=27017 --fork --logpath=/var/log/mongodb/mongodb.log

Command: The blog folder is the storage directory for our work and starts the database.

Connect to the database:

Open the package.json file and add in the last line of dependencies:

"mongodb": "1.4.15"

Then run in the project directory: npm install to update the dependent modules.

After the mongodb module is installed, create a settings.js file in the project directory and add:

module.exports = {
  cookieSecret: 'myblog',
  db: 'blog',
  host: 'localhost',
  port: 27017
};

Then create a new models folder, and create a new db.js file in the folder, add:

    var settings = require('../settings'),
        Db = require('mongodb').Db,
        Connection = require('mongodb').Connection,
        Server = require('mongodb').Server;
    module.exports = new Db(settings.db, new Server(settings.host, settings.port),
 {safe: true});

Then open app.js, in

var routes = require('./routes/index');下添加：

var settings = require('./settings');

Session support:

To store session information in the database for persistent maintenance, we need the help of two middleware, express-session and connect-mongo. In the package.json file add:

"express-session": "1.9.1",
"connect-mongo": "0.4.1"

After updating the module npm install, open the app.js file and add:

var session = require('express-session');
var MongoStore = require('connect-mongo')(session);

app.use(session({
  secret: settings.cookieSecret,
  key: settings.db,//cookie name
  cookie: {maxAge: 1000 * 60 * 60 * 24 * 30},//30 days
  store: new MongoStore({
    db: settings.db,
    host: settings.host,
    port: settings.port
  })
}));

Note: Here is a reminder that the location of these two pieces of code is a problem. The above two variables are placed in the position of the variables in the file. The following paragraph should be placed in:

app.use(express.static(path.join(__dirname, 'public')));

above this code.

express connect to mongodb database

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