Integración de la base de datos

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);
    }
  );