Commit/rollback a knex transaction using async/awa

问题:

I'm test driving the ES7 async/await proposal using this module to emulate it. I'm trying to make knex.js transactions play well with them, as a starting point.

Example code:

async function transaction() {
  return new Promise(function(resolve, reject){
    knex.transaction(function(err, result){
      if (err) {
        reject(err);
      } else {
        resolve(result);
      }
    });
  });
}

// Start transaction from this call

insert: async (function(db, data) {
 const trx = await(transaction());
 const idUser = await(user.insertData(trx, data));

 return {
    idCidUserstomer: idUser
  }
})

How can I commit() or rollback() if a transaction succeeds or fails?

回答1:

Building off of this Knex Transaction with Promises, it looks like it should be along these lines:

// assume `db` is a knex instance

insert: async (function(db, data) {
  const trx = db.transaction();
  try {
    const idUser = await(user.insertData(trx, data));
    trx.commit();
  } catch (error) {
    trx.rollback();
    throw error;
  }

  return {
    idUser: idUser
  }
})

回答2:

You might be able to achieve this with something similar to this

function createTransaction() {
  return new Promise((resolve) => {
    return knex.transaction(resolve);
  });
}

async function() {
  const trx = await createTransaction();
  ...
  trx.commit();
}

回答3:

You can try this:

async function() {
  await knex.transaction( async (trx) => {
     ...
     trx.commit();
  }
}