"Cannot execute queries while other unbuffered queries are active."
Some unknown factor is causing this in XAMPP 1.7.3 (PHP 5.3.1 / MySQL 5.1.41) with the php_pdo_mysql_libmysql.dll extension. The solution is to use the php_pdo_mysql_mysqlnd.dll extension instead. In C:\xampp\php\php.ini, change:
;extension=php_pdo_mysql_mysqlnd.dll extension=php_pdo_mysql_libmysql.dll
to:
extension=php_pdo_mysql_mysqlnd.dll ;extension=php_pdo_mysql_libmysql.dll
and restart Apache in the XAMPP Control Panel.
This will cause another issue of some SQL queries being logged in ErrorLog even though no actual error occurred. This is due to PDOStatement::execute() sometimes returning false when executing queries even though an error code of 00000 is returned (which is a successful code number).
XAMPP 1.7.4 does not experience these issues.
Reference topic:
http://forums.oscommerce.com/topic/378382-osc302-first-trial-some-issues/






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