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PDO::fetchAll ? PDO::fetch: ?? ??
? ??? ?? PHP ???? PHP?? ??? ?? ??? ??? ?: PDO::fetchAll ?? PDO::fetch? ???? ????

PHP?? ??? ?? ??? ??? ?: PDO::fetchAll ?? PDO::fetch? ???? ????

Nov 08, 2024 am 05:26 AM

When working with large result sets in PHP: Should I use PDO::fetchAll or PDO::fetch?

PDO::fetchAll ? PDO::fetch: ?? ??

PHP ???????? ??? ?? ??? ??? ? ???? ?? ? ??? ??? ? ????. ??? PDO::fetchAll() ? PDO::fetch(). ? ??? ?? ?? ? ??? ?? ??? ?? ?????.

PDO::fetchAll()

  • ? ?? ???? ?? ???? ?? ?? ?????.
  • ??? ??? ??? ???? ? ????? ?????? ??? ??????.
  • ??? ?? ?? ??? ????? ??? ???? ?????.

PDO::fetch ()

  • ???? ?? ?? ?????.
  • PDO::fetchAll()?? ??? ??????.
  • ???? ??? ??? ?????. ????? ?????.

?? ??

????? ??? ???? PDO::fetchAll()? PDO::fetch()?? ????. ?? ??? ?? ??? ??. ??? ??? ?? ??? ?? ? ?? ???? ???? ??? ?????.

??? ?? ??

PDO::fetchAll()? ??? ?? ??? ??? ?????. ?? ???. ??? ??? ??? ?? ?? ?? ??? ???? ?? ??? ??? ? ????. ??? PDO::fetch()? ?? ????? ????? ??? ???? ???? ????.

??? ??? ??? ??

? ??? ?? PDO::fetchAll() ? PDO::fetch()? ??? ?? ?????.

  • ?? ??? ??: ?? ??? ? ?? PDO::fetchAll() ? ???? ??? ???? ??? ? ????.
  • ??? ???: ???? ???? ?? ?? ??? PDO::fetch()? ??? ???? ? ?? ?????.
  • ??? ??: ???? ????? ???? ?? PDO::fetch()? ???? ? ?? ??? ???? ?????.

?:

??? ???? ?? ?? ???? ??? ??????.

$dbh = new PDO(...);
$sql = 'SELECT * FROM test_table';
$stmt = $dbh->query($sql);

$start_all = microtime(true);
$data = $stmt->fetchAll();
$end_all = microtime(true);

$start_one = microtime(true);
while($data = $stmt->fetch()) {}
$end_one = microtime(true);

echo 'Result : ' . PHP_EOL;
echo 'fetchAll : ' . ($end_all - $start_all) . 's, ' . memory_get_usage() . 'b' . PHP_EOL;
echo 'fetch : ' . ($end_one - $start_one) . 's, ' . memory_get_usage() . 'b' . PHP_EOL;

fetchAll ???? 0.35?? ??? 100MB? ???? ??? ??, ???? ??? 0.39?? ??? 440???? ???? ?????. .

? ??? PHP?? ??? ?? ??? ??? ?: PDO::fetchAll ?? PDO::fetch? ???? ????? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!

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Undresser.AI Undress

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AI Clothes Remover

AI Clothes Remover

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Video Face Swap

Video Face Swap

??? ??? AI ?? ?? ??? ???? ?? ???? ??? ?? ????!

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???? ?? ?? ?? ???

SublimeText3 ??? ??

SublimeText3 ??? ??

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???? 13.0.1 ???

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??? PHP ?? ?? ??

???? CS6

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