const mariadb = require('mariadb');
const pool = mariadb.createPool({
    host: "test-db.verdnatura.es",
    user:'vicent', 
    password: "llopis.19263",
    connectionLimit: 5
});
pool.getConnection()
    .then(conn => {
    
      conn.query("SELECT 1 as val")
        .then(rows => { // rows: [ {val: 1}, meta: ... ]
          return conn.query("INSERT INTO myTable value (?, ?)", [1, "mariadb"]);
        })
        .then(res => { // res: { affectedRows: 1, insertId: 1, warningStatus: 0 }
          conn.release(); // release to pool
        })
        .catch(err => {
          conn.release(); // release to pool
        })
        
    }).catch(err => {
      //not connected
    });