Question

//这是我的更新代码，它现在将当前时间与在mysql中节省了时间，但我的问题是它只与它相比第一次增加时间我需要的是当前时间将它与之比较最近的时间保存在mysql中。

         <?php
        //Include the database configuration
        include 'config.php';
        //Get the data of the selected teacher
        $teacher = $dbconnect->prepare("SELECT * FROM teacher_info
        WHERE IMEI = ? AND NFC = ?");
        $teacher->bindValue(1,$_GET['IMEI']);
        $teacher->bindValue(2,$_GET['NFC']);
        $teacher->execute();
        //Get the data
        $teacher_info = $teacher->fetch();


    //If there is such a teacher let the teacher enter
    if(!empty($teacher_info))
    {
        $time_out = $dbconnect->prepare("INSERT INTO time_out (teacher_id,name,NFC,IMEI,time_out) VALUES (?,?,?,?,NOW())");
        $time_out->bindValue(1,$teacher_info['teacher_id']);
        $time_out->bindValue(2,$teacher_info['name']);
        $time_out->bindValue(3,$teacher_info['NFC']);
        $time_out->bindValue(4,$teacher_info['IMEI']);
        $time_out->execute();
    }
    ?>
    <!doctype html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Welcome!</title>
    </head>
    <body>
    <h1>
        <?php
        //If there is such a teacher,welcome him/her
        if(!empty($teacher_info))
        {
            echo 'Welcome '.$teacher_info['name'].'! Your NFC is '.$teacher_info['NFC'];
        }
        else
        {
            echo 'You are not registered.';
        }
        ?>
    </h1>



    </body>
    </html>


   //Hope you can help me out

Answer 1

假设表time_in

中有time_in列

if($stmt = $dbconnect->prepare("SELECT time_in from time_in")){
$stmt->bind_param("s", $time_in); 
$stmt->execute(); 
$cur_time = time();
if($time_in === $cur_time){
echo "Teacher is on time";
}
}

这主要是关于事情应该如何发展的想法。总是有改进的余地。确切地说，您应该在teacher_id表中提供time_in，以便仅选择相应教师的时间。

修改

if($stmt = $dbconnect->prepare("SELECT time_in from time_in")){ $stmt->bind_param("s", $time_in); $stmt->execute(); if($stmtt = $dbconnect->prepare("SELECT time from profschedule")){ $stmtt->bind_param("s", $time); $stmt->execute(); if($time_in === $time) echo "Teacher is on time"; }}}

尽管如此，这篇文章写得不好，但其重点在于在评论中检查您的观点后，为您提供有关如何处理的IDEA。

如何将php中的两个字段与mysql中的不同表进行比较？

1 个答案: