Mastering the art of effectively utilizing asynchronous functions with the await keyword for database queries

Below is the simple route I have in place:

router.get('/:date', async (req, res) => {
    let tracks = []
    let query = 'SELECT * from `tracks` where `playlistDate` = \''+req.params.date+'\''
    let result = await pool.query(query)
    console.log(result)
})

I understand that this code alone won't function correctly. What steps should I take to ensure that I can use the await keyword with the query function as shown here?


The following code snippet shows the database connection pool, but with altered credentials.

var pool  = mysql.createPool({
    poolLimit : 10,
    host            : 'HOST',
    user            : 'USER',
    password        : 'PASS',
    database        : 'DB'
});

Answer №1

Perhaps adopting this rationale could prove beneficial, depending on the way it has been organized.

var pool  = mysql.createPool({
    poolLimit : 10,
    host            : 'HOST',
    user            : 'USER',
    password        : 'PASS',
    database        : 'DB'
});


const getTracks = (date) => {
  return new Promise((resolve, reject) => {
    let query = 'SELECT * FROM tracks WHERE playlistDate = ?'
    
    pool.query(query, [date], (err, res) => {
      if (err) {
        reject(err);
        return;
      }
      
      resolve(res);
    })
  })
};


router.get('/:date', async (req, res) => {
    try {
      let tracks = await getTracks(req.params.date);
      return res.status(200).json(tracks);
    } catch (err) {
      return res.status(400).json(err);
    }
    
})

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