資料庫整合

如果要在 Express 應用程式中新增連接資料庫的功能，只需在您的應用程式中載入資料庫的適當 Node.js 驅動程式即可。本文件簡要說明如何在您的 Express 應用程式中新增和使用一些最常用的 Node.js 資料庫系統模組。

• Cassandra
• CouchDB
• LevelDB
• MySQL
• MongoDB
• Neo4j
• PostgreSQL
• Redis
• SQLite
• ElasticSearch

Cassandra

模組：cassandra-driver 安裝

$ npm install cassandra-driver

範例

var cassandra = require('cassandra-driver');
var client = new cassandra.Client({ contactPoints: ['localhost']});

client.execute('select key from system.local', function(err, result) {
  if (err) throw err;
  console.log(result.rows[0]);
});

CouchDB

模組：nano 安裝

$ npm install nano

範例

var nano = require('nano')('http://localhost:5984');
nano.db.create('books');
var books = nano.db.use('books');

//Insert a book document in the books database
books.insert({name: 'The Art of war'}, null, function(err, body) {
  if (!err){
    console.log(body);
  }
});

//Get a list of all books
books.list(function(err, body){
  console.log(body.rows);
}

LevelDB

模組：levelup 安裝

$ npm install level levelup leveldown

範例

var levelup = require('levelup');
var db = levelup('./mydb');

db.put('name', 'LevelUP', function (err) {

  if (err) return console.log('Ooops!', err);
  db.get('name', function (err, value) {
    if (err) return console.log('Ooops!', err);
    console.log('name=' + value)
  });

});

MySQL

模組：mysql 安裝

$ npm install mysql

範例

var mysql      = require('mysql');
var connection = mysql.createConnection({
  host     : 'localhost',
  user     : 'dbuser',
  password : 's3kreee7'
});

connection.connect();

connection.query('SELECT 1 + 1 AS solution', function(err, rows, fields) {
  if (err) throw err;
  console.log('The solution is: ', rows[0].solution);
});

connection.end();

MongoDB

模組：mongodb 安裝

$ npm install mongodb

範例

var MongoClient = require('mongodb').MongoClient;

MongoClient.connect('mongodb://localhost:27017/animals', function(err, db) {
  if (err) {
    throw err;
  }
  db.collection('mammals').find().toArray(function(err, result) {
    if (err) {
      throw err;
    }
    console.log(result);
  });
});

如果您需要 MongoDB 物件模型驅動程式，請查看 Mongoose。

Neo4j

模組：apoc 安裝

$ npm install apoc

範例

var apoc = require('apoc');

apoc.query('match (n) return n').exec().then(
  function (response) {
    console.log(response);
  },
  function (fail) {
    console.log(fail);
  }
);

PostgreSQL

模組：pg-promise 安裝

$ npm install pg-promise

範例

var pgp = require("pg-promise")(/*options*/);
var db = pgp("postgres://username:password@host:port/database");

db.one("SELECT $1 AS value", 123)
    .then(function (data) {
        console.log("DATA:", data.value);
    })
    .catch(function (error) {
        console.log("ERROR:", error);
    });

Redis

模組：redis 安裝

$ npm install redis

範例

var client = require('redis').createClient();

client.on('error', function (err) {
  console.log('Error ' + err);
});

client.set('string key', 'string val', redis.print);
client.hset('hash key', 'hashtest 1', 'some value', redis.print);
client.hset(['hash key', 'hashtest 2', 'some other value'], redis.print);

client.hkeys('hash key', function (err, replies) {

  console.log(replies.length + ' replies:');
  replies.forEach(function (reply, i) {
    console.log('    ' + i + ': ' + reply);
  });

  client.quit();

});

SQLite

模組：sqlite3 安裝

$ npm install sqlite3

範例

var sqlite3 = require('sqlite3').verbose();
var db = new sqlite3.Database(':memory:');

db.serialize(function() {

  db.run('CREATE TABLE lorem (info TEXT)');
  var stmt = db.prepare('INSERT INTO lorem VALUES (?)');

  for (var i = 0; i < 10; i++) {
    stmt.run('Ipsum ' + i);
  }

  stmt.finalize();

  db.each('SELECT rowid AS id, info FROM lorem', function(err, row) {
    console.log(row.id + ': ' + row.info);
  });
});

db.close();

ElasticSearch

模組：elasticsearch 安裝

$ npm install elasticsearch

範例

var elasticsearch = require('elasticsearch');
var client = elasticsearch.Client({
  host: 'localhost:9200'
});

client.search({
  index: 'books',
  type: 'book',
  body: {
    query: {
      multi_match: {
        query: 'express js',
        fields: ['title', 'description']
      }
    }
  }
}).then(function(response) {
  var hits = response.hits.hits;
}, function(error) {
  console.trace(error.message);
});