Passing arguments through predefined function in Node.js - node.js

Question

I'm struggling with passing data concept in Node.js.
Let's take SQL tedious as example. Here is code from examples:
//acquire a connection
pool.acquire(function poolAcquire(err, connection) {
if (err) { console.error(err); return; }
//use the connection as normal
var request = new Request('select 1;select 2;select 3', function requestCallback (err, rowCount) {
if (err) { console.error(err); return;}
console.log('rowCount: ' + rowCount);
//release the connection back to the pool when finished
connection.release();
});
request.on('row', function onRequestRow(columns) {
console.log('value: ' + columns[0].value);
});
connection.execSql(request);
});
pool.acguire takes function as the argument and this function has particular signature (err,connection)
My question is - how do I pass SQL statement inside this function?
I cannot change signature because different function signature is not called.
Also I cannot use global scope because variable may be changed outside.
In other words I need to find way to bypass wrappers calls and still pass some data.
Something like
var mySQLs = ['select 1;select 2;select 3','select 4;select 5;'];
async.forEach(mySQLs,WorkWithOneItem, AllIsDone);
function WorkWithOneItem(item, callback){
pool.acquire(?????(item));
callback(); // tell async that the iterator has completed
}
function AllIsDone (err) {
console.log('All done');
}

Answer 1

By wrapping it in another function:
function aquire(sql, callback) {
pool.acquire(function poolAcquire(err, connection) {
if (err) { console.error(err); return callback(); }
//use the connection as normal
var request = new Request(sql, function requestCallback (err, rowCount) {
if (err) { console.error(err); return;}
console.log('rowCount: ' + rowCount);
//release the connection back to the pool when finished
connection.release();
callback();
});
request.on('row', function onRequestRow(columns) {
console.log('value: ' + columns[0].value);
});
connection.execSql(request);
});
}
function WorkWithOneItem(item, callback){
acquire(item, () => {
callback(); // tell async that the iterator has completed
});
}

Answer 2

Do you need the results out as well?
var mySQLs = ['select 1;select 2;select 3','select 4;select 5;'];
async.forEach(mySQLs, WorkWithOneItem, AllIsDone);
function WorkWithOneItem(sql, callback){
pool.acquire(function poolAcquire(err, connection) {
if (err) return callback(err);
//use the connection as normal
var request = new Request(sql, function requestCallback (err, rowCount) {
if (err) return callback(err);
console.log('rowCount: ' + rowCount);
//release the connection back to the pool when finished
connection.release();
});
var rows = [];
var count = 0;
request.on('row', function onRequestRow(columns) {
console.log('value: ' + columns[0].value);
rows.push(columns[0].value); // or whatever you actually want out of these.
});
request.on('done', function onRequestDone() {
callback(null, rows);
});
connection.execSql(request);
});
callback(); // tell async that the iterator has completed
}
function AllIsDone (err) {
console.log('All done');
// you probably want async.map, so you can get the result back
// as the second argument for a function like this
}