Re: PDO fetch performance problems with many bindparameters

On 29.08.2020 at 09:30, Matteo Beccati wrote: > Hi Christoph, > > On 28/08/2020 22:57, Christoph M. Becker wrote: >> Can we be certain that the relevant bits of the formerly _reserved_flags >> are zero-filled for all existing drivers? > > We can, that's basically the premise of the PR itself: > > 1. The flags are in the pdo_dbh_t struct which is the dbh->inner part > 2. dbh->inner = ecalloc(1, sizeof(pdo_dbh_t)): > 3. stmt->dbh is set as dbh->inner, in prepare and query > 4. drivers can eventually set some bits to 1. > > A few quick links: > > > https://github.com/php/php-src/blob/658f6ff2dae42c4f2b5c6f8d6adc8c8f09b52b47/ext/pdo/php_pdo_driver.h#L514 > > https://github.com/php/php-src/blob/658f6ff2dae42c4f2b5c6f8d6adc8c8f09b52b47/ext/pdo/pdo_dbh.c#L562 > > https://github.com/php/php-src/blob/658f6ff2dae42c4f2b5c6f8d6adc8c8f09b52b47/ext/pdo/pdo_dbh.c#L1085 > > https://github.com/php/php-src/blob/658f6ff2dae42c4f2b5c6f8d6adc8c8f09b52b47/ext/pdo/pdo_dbh.c#L1481 Thanks! So there only would be a problem, if a driver modifies _reserved_flags (what they're not supposed to do). Looks to be okay then for the stable release branches. -- Christoph M. Becker