データベースの統合

const cassandra = require('cassandra-driver') const client = new cassandra.Client({ contactPoints: ['localhost'] }) client.execute('select key from system.local', (err, result) => { if (err) throw err console.log(result.rows[0]) }) 

const couchbase = require('couchbase') const bucket = (new couchbase.Cluster('http://localhost:8091')).openBucket('bucketName') // add a document to a bucket bucket.insert('document-key', { name: 'Matt', shoeSize: 13 }, (err, result) => { if (err) { console.log(err) } else { console.log(result) } }) // get all documents with shoe size 13 const n1ql = 'SELECT d.* FROM `bucketName` d WHERE shoeSize = $1' const query = N1qlQuery.fromString(n1ql) bucket.query(query, [13], (err, result) => { if (err) { console.log(err) } else { console.log(result) } }) 

const nano = require('nano')('http://localhost:5984') nano.db.create('books') const books = nano.db.use('books') // Insert a book document in the books database books.insert({ name: 'The Art of war' }, null, (err, body) => { if (err) { console.log(err) } else { console.log(body) } }) // Get a list of all books books.list((err, body) => { if (err) { console.log(err) } else { console.log(body.rows) } }) 

const levelup = require('levelup') const db = levelup('./mydb') db.put('name', 'LevelUP', (err) => { if (err) return console.log('Ooops!', err) db.get('name', (err, value) => { if (err) return console.log('Ooops!', err) console.log(`name=${value}`) }) }) 

const mysql = require('mysql') const connection = mysql.createConnection({ host: 'localhost', user: 'dbuser', password: 's3kreee7', database: 'my_db' }) connection.connect() connection.query('SELECT 1 + 1 AS solution', (err, rows, fields) => { if (err) throw err console.log('The solution is: ', rows[0].solution) }) connection.end() 

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

const MongoClient = require('mongodb').MongoClient MongoClient.connect('mongodb://localhost:27017/animals', (err, client) => { if (err) throw err const db = client.db('animals') db.collection('mammals').find().toArray((err, result) => { if (err) throw err console.log(result) }) }) 

const neo4j = require('neo4j-driver') const driver = neo4j.driver('neo4j://localhost:7687', neo4j.auth.basic('neo4j', 'letmein')) const session = driver.session() session.readTransaction((tx) => { return tx.run('MATCH (n) RETURN count(n) AS count') .then((res) => { console.log(res.records[0].get('count')) }) .catch((error) => { console.log(error) }) }) 

const oracledb = require('oracledb') const config = { user: '<your db user>', password: '<your db password>', connectString: 'localhost:1521/orcl' } async function getEmployee (empId) { let conn try { conn = await oracledb.getConnection(config) const result = await conn.execute( 'select * from employees where employee_id = :id', [empId] ) console.log(result.rows[0]) } catch (err) { console.log('Ouch!', err) } finally { if (conn) { // conn assignment worked, need to close await conn.close() } } } getEmployee(101) 

const pgp = require('pg-promise')(/* options */) const db = pgp('postgres://username:password@host:port/database') db.one('SELECT $1 AS value', 123) .then((data) => { console.log('DATA:', data.value) }) .catch((error) => { console.log('ERROR:', error) }) 

const redis = require('redis') const client = redis.createClient() client.on('error', (err) => { console.log(`Error ${err}`) }) client.set('string key', 'string val', redis.print) client.hset('hash key', 'hashtest 1', 'some value', redis.print) client.hset(['hash key', 'hashtest 2', 'some other value'], redis.print) client.hkeys('hash key', (err, replies) => { console.log(`${replies.length} replies:`) replies.forEach((reply, i) => { console.log(` ${i}: ${reply}`) }) client.quit() }) 

const Connection = require('tedious').Connection const Request = require('tedious').Request const config = { server: 'localhost', authentication: { type: 'default', options: { userName: 'your_username', // update me password: 'your_password' // update me } } } const connection = new Connection(config) connection.on('connect', (err) => { if (err) { console.log(err) } else { executeStatement() } }) function executeStatement () { request = new Request("select 123, 'hello world'", (err, rowCount) => { if (err) { console.log(err) } else { console.log(`${rowCount} rows`) } connection.close() }) request.on('row', (columns) => { columns.forEach((column) => { if (column.value === null) { console.log('NULL') } else { console.log(column.value) } }) }) connection.execSql(request) } 

const sqlite3 = require('sqlite3').verbose() const db = new sqlite3.Database(':memory:') db.serialize(() => { db.run('CREATE TABLE lorem (info TEXT)') const stmt = db.prepare('INSERT INTO lorem VALUES (?)') for (let i = 0; i < 10; i++) { stmt.run(`Ipsum ${i}`) } stmt.finalize() db.each('SELECT rowid AS id, info FROM lorem', (err, row) => { console.log(`${row.id}: ${row.info}`) }) }) db.close() 

const elasticsearch = require('elasticsearch') const client = elasticsearch.Client({ host: 'localhost:9200' }) client.search({ index: 'books', type: 'book', body: { query: { multi_match: { query: 'express js', fields: ['title', 'description'] } } } }).then((response) => { const hits = response.hits.hits }, (error) => { console.trace(error.message) })