Bogdan Stancescu wrote:
Hello list,
I'm developing a library and would need to know if the code calling my
library has already started a MySQL transaction or not. I want to know
whether I should start one or use savepoints instead -- starting a
transaction if one is already in progress commits the existing
transaction, and setting a savepoint silently fails outside
transactions. And I was unable to find any non-destructive way of
retrieving that information -- is there any?
I don't think mysql has any way of finding that out. If you're using an
abstraction layer, it's easy enough in code - though rollback's are a
little harder - should they do a complete rollback or just to a savepoint?
class db
{
....
private $transaction_count = 0;
public function startTransaction()
{
if ($this->transaction_count == 0) {
mysql_query("BEGIN");
} else {
mysql_query("SAVEPOINT");
}
$this->transaction_count++;
}
public function commitTransaction()
{
// you can't commit a transaction if there's more than one "open"
// so just decrement the counter
if ($this->transaction_count > 1) {
$this->transaction_count--;
return;
}
$this->transaction_count = 0;
mysql_query("COMMIT");
}
}
Now you can just call
$db->startTransaction();
and
$db->commitTransaction();
and it'll handle the stuff for you.
--
Postgresql & php tutorials
http://www.designmagick.com/
--
PHP General Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
