php - Possible to do a MYSQL UPDATE query but not actually update a column?

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php - Possible to do a MYSQL UPDATE query but not actually update a column?

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Undefined answered · Answer 1 · 2022-11-15

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Solution:

If you have specific values for each column that will never appear in the data, you can check for those. For instance, if name can never beDO NOT UPDATE, have your prepared statement be:

UPDATE homes SET ..., name = if(?='DO NOT UPDATE',name,?) WHERE id=?

and pass the value for name (which may beDO NOT UPDATE) to execute twice:

$stmt2->execute([..., $row['name'], $row['name'], $row['id']]);

Undefined answered · Answer 2 · 2022-11-15

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Solution:

I believe you do not want to separately process the $figures array so you want to do it in a single loop.

So just add a second sql prepared statement (you do not mind, right?) and then use a if-then-else to determine which prepared statement to execute

<?php

$figures = [ ['age' => 'foo1', 'name' => 'DO NOT UPDATE', 'id' => '1'],   ['age' => 'foo1', 'name' => 'bar1', 'id' => '2'],   ['age' => 'foo2', 'name' => 'bar2', 'id' => '3']];

$stmt = $pdo->prepare("UPDATE homes SET age = ?, name = ? where id=?");
$stmt2 = $pdo->prepare("UPDATE homes SET age = ? where id=?");

foreach ($figures as $row) {

 if ($row['name']!='DO NOT UPDATE'){
    $stmt->execute([$row['age'], $row['name'], $row['id']]);
    } else {
     $stmt2->execute([$row['age'], $row['id']]);
  }
}
?>

Please amend the prepared statements to suit your real needs

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