I am using this code so I can update a record in database:

$query = mysql_query("UPDATE article

SET com_count = ". $comments_count

WHERE article_id = .$art_id ");

My question is: How can I use variables in a MySQL UPDATE statement.

解決方案

$query = mysql_query("UPDATE article set com_count = $comments_count WHERE article_id = $art_id");

You was messing up the quotes and concats.

You can use inline vars like the previous example or concat them like:

$query = mysql_query("UPDATE article set com_count = " . $comments_count . " WHERE article_id = " . $art_id);

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