php - 如何仅显示 PHP 表中列为 NULL 的值？

Question

我的代码不起作用，我不明白为什么

public function fetch_active_table_data(){
        $query = "SELECT id, name, location, admission, drink_prices, Performer FROM drinkdeals WHERE admission IS NULL";
        $stmt = $this->dbh->prepare($query);
        $stmt->execute(array("0"));   

我试图只显示入场为空的事件。我究竟做错了什么？谢谢，基兰
编辑:顺便说一句，当我删除 WHERE convention is NULL 时，它确实有效，所以我知道这就是问题所在。谢谢

Answer 1

这取决于您如何设置该值。也许你应该尝试寻找一个空值，例如:

public function fetch_active_table_data(){
    $query = "SELECT id, name, location, admission, drink_prices, Performer FROM drinkdeals WHERE admission=''";
    $stmt = $this->dbh->prepare($query);
    $stmt->execute(array("0"));
}