OO performance question

Question

I will be quick and simple on this. Basically I need to merge multiple Invoices(Object) quickly and fast.

A simple idea is to

$invoice1 = new Invoice(1);
$invoice2 = new Invoice(2);
$invoice3 = new Invoice(3);
$invoice1->merge($invoice2,invoice3);
$invoice1->save();

Since each object will query it's own data, the number of queries increase as the number of invoices needed to be merge increases.

However, this is a case where a single query

SELECT * FROM invoice WHERE id IN (1,2,3)

Will suffice, however the implementation will not be as elegant as the above.

Initial benchmarks on sample data indicates a 2.5x-3x decrease in speed on the above due to the sheer number of mysql queries.

Advice please

Answer 1

Use an Invoice factory. You ask it for invoices using various methods. newest(n) get(id) get(array(id,id,id)) so on, and it returns arrays of invoices or single invoice objects.

<?php
    $invoice56 = InvoiceFactory::Get(56); // Get's invoice 56
    $invoices = InvoiceFactory::Newest(25); // Get's an array of the newest 25 invoices
?>

Answer 2

你能使Invoice对象变得懒惰，让merge加载尚未加载的所有内容吗？

Answer 3

Make sure you work on the same db connection all the time. Check that it does not reconnect in one script execution thread.

Answer 4

I could suggest looking into using an actual ORM (object relational mapping) in order to create a seperation between your actual queries and the objects used.. Take a look at Propel or (my favorite) Doctrine (version 2 is very easy to use)

That way you could have exactly what you want in just the same amount of code...