Question

使用以下功能遇到麻烦。基本上我的所有表格都有一个列，其中“已停止”＃39;将是＆＃39; 0＆＃39; 0或者＆＃39; 1＆＃39;。我无法使if语句生效。

// Function that checks if items are already discontinued or not
function checkDiscontinued($dbh, $discontinued) {
try {
    foreach ($discontinued as $id) {
        //check to see if itemdiscontinued is 1 or 0
        $stmt = $dbh->query("SELECT discontinued FROM `$id` ORDER BY `date` DESC LIMIT 1");

        if (!$stmt->fetch(PDO::FETCH_ASSOC)) {
        echo "Action if true";
        }   else {
        echo "Action if false";
        }
    }
}
    catch (PDOException $e) {
    echo $e->getMessage();
    }
}

Answer 1

无论你的列作为结果集返回什么，fetch（）方法总是返回true（我猜这应该是常识）。

您需要的是将列的值分配给变量，并测试该值。

const DISCONTINUED = 1;

function checkDiscontinued($dbh, $discontinued) {
try {
    foreach ($discontinued as $id) {
        $stmt = $dbh->query("SELECT discontinued FROM `$id` ORDER BY `date` DESC LIMIT 1");

        $row = $stmt->fetch(PDO::FETCH_ASSOC);
        if($row['discontinued'] == self::DISCONTINUED) { //if the column result == '1'
            echo "Action if true";
        }   else {
            echo "Action if false";
        }
    }
}
    catch (PDOException $e) {
        echo $e->getMessage();
    }
}

如果声明（PDO :: FETCH_ASSOC）有问题

1 个答案: