php - 如何在 mysql php 中使用 IN OPERATOR 删除所有行

Question

我在理解该程序的行为时遇到问题，下面是使用 IN 运算符删除电子邮件地址的简单代码

$emails = $_POST['ids'];
    $sql = "DELETE FROM newsletter where email ";
    $condition = sprintf('IN ("%s")',implode(' "," ',$_POST['ids']));
    $sql = $sql.$condition;
    include '../includes/db.php';
    $r = mysql_query($sql);

    echo $sql;

它只删除一个电子邮件 ID 并返回 true 。我怎样才能让它以删除所有电子邮件的方式运行。

下面是使用上述代码构建的查询。

DELETE FROM newsletter where email IN ("adfadsf@gmail.com "," asdfasfasf@gmail.com "," kjhkhsd@assdfsdf.sdfsf "," shit@gshit.com "," someother@gmail.com")

是不是删除方式不对？

Answer 1

而不是:

$condition = sprintf('IN ("%s")',implode(' "," ',$_POST['ids']));

做:

$condition = sprintf('IN ("%s")',implode('", "',$_POST['ids']));

IN 运算符将字段内容与值完全匹配。值开头和结尾的空格可能会导致您出现问题。