Consider adding a Promise for the 'done' state

[battesonb]

The .read method would be great if it returned a Promise instead of void to handle all the errors and resolved on the Cursor's 'done' state. I can maybe add this on the weekend if you think it's a valuable addition. Adding it to the current method might be considered "breaking" the API, but no one should be using the return type anyway, so you could reuse the method.

[goshoo]

I would like to use promise too.

For example I would like to use something like this

function pgCursorPromise(cursor, itemNum){
    return new Promise(function(resolve,reject){
        cursor.read(itemNum, (err, rows) => {
            if (err) {
                return reject(err);
            }

            resolve(rows);
        });
    });
}

.....

    const client = await global.pgpool.connect();
    try{
        let rows;
        let totalRows = 0;
        const cursor = client.query(new Cursor('select * from accounts'));
        while ((rows = await pgCursorPromise(cursor, 100)) && rows.length > 0){
            for(let row of rows){
                // do the actual work here
            }
        }
    } catch (err) {
        console.log(err);
    } finally {
        client.release();
    }