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doctrine2/manual/docs/Performance - Internal optimizations - DELETE.php
2007-04-13 21:49:11 +00:00

26 lines
862 B
PHP

<code type="php">
/**
* lets presume $users contains a collection of users
* each having 0-1 email and 0-* phonenumbers
*/
$users->delete();
/**
* On connection drivers other than mysql doctrine would now perform three queries
* regardless of how many users, emails and phonenumbers there are
*
* the queries would look something like:
* DELETE FROM entity WHERE entity.id IN (1,2,3, ... ,15)
* DELETE FROM phonenumber WHERE phonenumber.id IN (4,6,7,8)
* DELETE FROM email WHERE email.id IN (1,2, ... ,10)
*
* On mysql doctrine is EVEN SMARTER! Now it would perform only one query!
* the query would look like:
* DELETE entity, email, phonenumber FROM entity
* LEFT JOIN phonenumber ON entity.id = phonenumber.entity_id, email
* WHERE (entity.email_id = email.id) && (entity.id IN(4, 5, 6, 7, 8, 9, 10, 11)) && (entity.type = 0)
*/
</code>