php - 如果特定行数据尚未在同一日期插入，如何检查和插入数据

Question

我想将特定的行数据插入到我的数据库表中，但首先，我们必须检查数据库表中是否存在行数据。如果记录不存在，我会将 userid、companyid 和当前日期插入到我的表中。这是列表:

我的获取数据的代码:

<?php

    $con=mysqli_connect("localhost" , "root" , "" , "accounts");
    if (!$con) {
        echo "connection failed";
    }

$query= "
SELECT * 
  FROM company
 WHERE catagory = 'A'
";
/*"SELECT * FROM `company` WHERE catagory='A'";*/
 $result=mysqli_query($con,$query);
 while ($row=mysqli_fetch_array($result)) {
    ?>
    <tbody>
        <tr>
        <td><a href='/bw/gymdetail.php?id=<?=$row['id'];?>'><?=$row['id'];?></a></td>
        <td><a href='/bw/gymdetail.php?id=<?=$row['id'];?>'><?=$row['first_name']?></a></td>
        <td><?=$row['u_city'];?></td>
        <td><?=$row['u_address'];?></td>
        <td><a href='/bw/login-system/checkin.php?id=<?=$row['id'];?>&uid=<?=$_REQUEST['id'];?>'> Check In</a></td>
        </tr>

    </tbody>
    <?php

}
?> 

checkin.php页面

<?php

require 'db.php';

if (isset($_GET['uid'])) {

$id = $_GET['id'];
$uid = $_GET['uid'];
$now=new datetime();
$date = $now->format('m-d-y');

    $sql = $mysqli->query("
SELECT * 
  FROM checkins
 WHERE userid = '$id' 
   AND `dateis` = '$date'
");
    $productcount = $sql->num_rows;
    if($productcount == '1'){
        $sql = "
INSERT INTO checkins (userid, companyid, dateis) 
VALUES ('$uid','$id','$date')
";
            $query = mysqli_query($mysqli,$sql);
}
else{

    echo "already clicked";
}
}

?>

如果用户单击 checkin 按钮。我需要检查该行是否已在具有相同用户和相同日期的表中。如果不存在则插入数据，否则显示记录已存在的消息。

Answer 1

看看这个

https://chartio.com/resources/tutorials/how-to-insert-if-row-does-not-exist-upsert-in-mysql/#using-insert-ignore

<?php

require 'db.php';

if (isset($_GET['uid'])) {

$id = $_GET['id'];
$uid = $_GET['uid'];
$now=new datetime();
$date = $now->format('m-d-y');
$sql = "INSERT IGNORE INTO checkins (userid, companyid, dateis) " 
            . "VALUES ('$uid','$id','$date')";
            $query = mysqli_query($mysqli,$sql);

            if(!mysqli_affected_rows($mysqli)){
                echo "already clicked";
            }
}

?>