从php更新多行Mysql

Question

这是我正在尝试做的事情:更新任意数量的行,将多个字段更改为SAME值.

$var = "1 3 5 7 9";  
$query = "UPDATE tablename SET seen_before = 1 WHERE id = SET ($var);"

我的问题是:当我查看一个集合时,Where子句的确切语法是什么,以及如何通过php变量传递Set项目.

谢谢,
迈克尔

Answer 1

$ids   = "1, 3, 5, 7, 9";  
$query = "UPDATE tablename SET seen_before = 1 WHERE id IN ($ids)";

如果您的ID是动态的,并且它们可能是动态的,请使用类似的东西来正确地转义它们以获取SQL查询:

// Assuming $ids it's coming from an untrusted source, like $_GET
$ids   = array(1, 3, 5, 7, 9);
$ids   = array_map('intval', $ids);
$ids   = implode(', ', $ids);

$query = "UPDATE tablename SET seen_before = 1 WHERE id IN ($ids)";