Node.js pg promise and pagination from API

Question

Look at https://github.com/vitaly-t/pg-promise/wiki/Data-Imports there is a very detailed document on how to use it for import.

However, while this works for a demo scenario, I do not know how to apply it in my case.

When I make my web call, I get the actual JSON data and a parameter in the header that gives me the value for the next page (maybe a date or a string or a numeric value).

This example says:

db.tx('massive-insert', t => {
    return t.sequence(index => {
        return getNextData(index)
            .then(data => {
                if (data) {
                    const insert = pgp.helpers.insert(data, cs);
                    return t.none(insert);
                }
            });
    });
})
    .then(data => {
        console.log('Total batches:', data.total, ', Duration:', data.duration);
    })
    .catch(error => {
        console.log(error);
    });

In this case, it sequence(indexwill use an index that seems to increase +1. But in my case

function getNextData(nextPage) {
    //get the data for nextPage
    .....
   //get the nextPage if exists for future use
   nextPage = response.next;

   resolve(data);
}

My question is how can I replace indexwith nextPagein this example, since each new Promise should use nextPagefrom the previous one.

LATER EDIT: nextPageInfo?

:

db.any('Select value from table')
      .then(function(value) {

var data = value; //not working

db.tx('massive-insert', t => {
    return t.sequence((index, data) => {
        return getNextData(index, data)
            .then(a => {
                if (a) {
                    const insert = pgp.helpers.insert(a.data, cs);
                    return t.none(insert).then(() => a.nextPageInfo);
                }
            })
    });
})
    .then(data => {
        // COMMIT has been executed
        console.log('Total batches:', data.total, ', Duration:', data.duration);
    })
    .catch(error => {
        // ROLLBACK has been executed
        console.log(error);
    })

}

Answer 1

, Data Imports extras, , . , :

function getNextData(t, index, nextPageInfo) {
    // t = database transaction protocol

    // NOTE: nextPageInfo = undefined when index = 0

    return new Promise((resolve, reject) {

        /* pull the next data, according to nextPageInfo */            

        /* do reject(error) on an error, to ROLLBACK changes */

        if(/* there is still data left*/) {
            // if whateverNextDetails = undefined, the data will be inserted,
            // but the sequence will end there (as success).
            resolve({data, nextPageInfo: whateverNextDetails});
        } else {
            resolve(null);
        }   
    });
}

db.tx('massive-insert', t => {
    return t.sequence((index, data) => {
        return getNextData(t, index, data)
            .then(a => {
                if (a) {
                    const insert = pgp.helpers.insert(a.data, cs);
                    return t.none(insert).then(() => a.nextPageInfo);
                }
            })
    });
})
    .then(data => {
        // COMMIT has been executed
        console.log('Total batches:', data.total, ', Duration:', data.duration);
    })
    .catch(error => {
        // ROLLBACK has been executed
        console.log(error);
    });

, getNextData nextPageInfo, undefined, , ( ).