<h2>Cassandra</h2>    <p>Module: cassandra-driver Installation</p>    <pre>  <code class="language-javascript">$ npm install cassandra-driver</code></pre>    <p>Example</p>    <pre>  <code class="language-javascript">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])  })</code></pre>    <h2>Couchbase</h2>    <p>Module: couchnode Installation</p>    <pre>  <code class="language-javascript">$ npm install couchbase</code></pre>    <p>Example</p>    <pre>  <code class="language-javascript">var couchbase = require('couchbase')  var bucket = (new couchbase.Cluster('http://localhost:8091')).openBucket('bucketName')    // add a document to a bucket  bucket.insert('document-key', { name: 'Matt', shoeSize: 13 }, function (err, result) {    if (err) {      console.log(err)    } else {      console.log(result)    }  })    // get all documents with shoe size 13  var n1ql = 'SELECT d.* FROM `bucketName` d WHERE shoeSize = $1'  var query = N1qlQuery.fromString(n1ql)  bucket.query(query, [13], function (err, result) {    if (err) {      console.log(err)    } else {      console.log(result)    }  })</code></pre>    <h2>CouchDB</h2>    <p>Module: nano Installation</p>    <pre>  <code class="language-javascript">$ npm install nano</code></pre>    <p>Example</p>    <pre>  <code class="language-javascript">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(err)    } else {      console.log(body)    }  })    // Get a list of all books  books.list(function (err, body) {    if (err) {      console.log(err)    } else {      console.log(body.rows)    }  })</code></pre>    <h2>LevelDB</h2>    <p>Module: levelup Installation</p>    <pre>  <code class="language-javascript">$ npm install level levelup leveldown</code></pre>    <p>Example</p>    <pre>  <code class="language-javascript">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)    })  })</code></pre>    <h2>MySQL</h2>    <p>Module: mysql Installation</p>    <pre>  <code class="language-javascript">$ npm install mysql</code></pre>    <p>Example</p>    <pre>  <code class="language-javascript">var mysql = require('mysql')  var connection = mysql.createConnection({    host     : 'localhost',    user     : 'dbuser',    password : 's3kreee7',    database : 'my_db'  });    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()</code></pre>    <h2>MongoDB</h2>    <p>Module: mongodb Installation</p>    <pre>  <code class="language-javascript">$ npm install mongodb</code></pre>    <p>Example</p>    <pre>  <code class="language-javascript">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)    })  })</code></pre>    <p>If you want an object model driver for MongoDB, look at Mongoose.</p>    <h2>Neo4j</h2>    <p>Module: apoc Installation</p>    <pre>  <code class="language-javascript">$ npm install apoc</code></pre>    <p>Example</p>    <pre>  <code class="language-javascript">var apoc = require('apoc')    apoc.query('match (n) return n').exec().then(    function (response) {      console.log(response)    },    function (fail) {      console.log(fail)    }  )</code></pre>    <h2>PostgreSQL</h2>    <p>Module: pg-promise Installation</p>    <pre>  <code class="language-javascript">$ npm install pg-promise</code></pre>    <p>Example</p>    <pre>  <code class="language-javascript">var pgp = require('pg-promise')(/*options*/)  var db = pgp('postgres://username:password@host:port/database')    db.one('SELECT $1 AS value', 123)    .then(function (data) {      console.log('DATA:', data.value)    })    .catch(function (error) {      console.log('ERROR:', error)    })</code></pre>    <h2>Redis</h2>    <p>Module: redis Installation</p>    <pre>  <code class="language-javascript">$ npm install redis</code></pre>    <p>Example</p>    <pre>  <code class="language-javascript">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()  })</code></pre>    <h2>SQL Server</h2>    <p>Module: tedious Installation</p>    <pre>  <code class="language-javascript">$ npm install tedious</code></pre>    <p>Example</p>    <pre>  <code class="language-javascript">var Connection = require('tedious').Connection;  var Request = require('tedious').Request;    var config = {    userName: 'your_username', // update me    password: 'your_password', // update me    server: 'localhost'  }    var connection = new Connection(config);    connection.on('connect', function(err) {    if (err) {      console.log(err);    } else {      executeStatement();    }  });    function executeStatement() {    request = new Request("select 123, 'hello world'", function(err, rowCount) {      if (err) {        console.log(err);      } else {        console.log(rowCount + ' rows');      }      connection.close();    });      request.on('row', function(columns) {      columns.forEach(function(column) {        if (column.value === null) {          console.log('NULL');        } else {          console.log(column.value);        }      });    });      connection.execSql(request);  }</code></pre>    <h2>SQLite</h2>    <p>Module: sqlite3 Installation</p>    <pre>  <code class="language-javascript">$ npm install sqlite3</code></pre>    <p>Example</p>    <pre>  <code class="language-javascript">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()</code></pre>    <h2>ElasticSearch</h2>    <p>Module: elasticsearch Installation</p>    <pre>  <code class="language-javascript">$ npm install elasticsearch</code></pre>    <p>Example</p>    <pre>  <code class="language-javascript">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)  })</code></pre>    <p> </p>    <p>来自：https://segmentfault.com/a/1190000008753686</p>    <p> </p>