避免重复数据 - 预约时间php mysql

Question

我想使用PHP防止表单中的重复值进入数据库表。

包含名为指定点的表的数据库：

CREATE TABLE `points` (
  `appoint_id` int(11) NOT NULL,
  `appoint_date` datetime NOT NULL,
  `client_name` varchar(255) NOT NULL,
  `client_contact` varchar(255) NOT NULL,
  `sub_total` varchar(255) NOT NULL,
  `vat` varchar(255) NOT NULL,
  `total_amount` varchar(255) NOT NULL,
  `discount` varchar(255) NOT NULL,
  `grand_total` varchar(255) NOT NULL,
  `paid` varchar(255) NOT NULL,
  `due` varchar(255) NOT NULL,
  `payment_type` int(11) NOT NULL,
  `payment_status` int(11) NOT NULL,
  `appoint_status` int(11) NOT NULL DEFAULT '0'
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

用于创建约会的表单处理脚本

   <?php    

require_once 'core.php';

$valid['success'] = array('success' => false, 'messages' => array(), 'appoint_id' => '');

if($_POST) {    

    $appointDate        = date('Y-m-d H:i:s', strtotime($_POST['appointDate']));

  $clientName                   = $_POST['clientName'];
  $clientContact                = $_POST['clientContact'];
  $subTotalValue                = $_POST['subTotalValue'];
  $vatValue                         =   $_POST['vatValue'];
  $totalAmountValue     = $_POST['totalAmountValue'];
  $discount                         = $_POST['discount'];
  $grandTotalValue          = $_POST['grandTotalValue'];
  $paid                                 = $_POST['paid'];
  $dueValue                         = $_POST['dueValue'];
  $paymentType                  = $_POST['paymentType'];
  $paymentStatus                = $_POST['paymentStatus'];

    $check=mysqli_query("SELECT * from points WHERE appoint_date='$appointDate'");

    $checkrows=mysqli_num_rows($check);

   if($checkrows>0) {
      echo "appointment exists";
   } else {  
    //insert results from the form input

    $query = "INSERT IGNORE INTO points (appoint_date, client_name, client_contact, sub_total, vat, total_amount, discount, grand_total, paid, due, payment_type, payment_status, appoint_status) VALUES ('$appointDate', '$clientName', '$clientContact', '$subTotalValue', '$vatValue', '$totalAmountValue', '$discount', '$grandTotalValue', '$paid', '$dueValue', $paymentType, $paymentStatus, 1)";

     $result = mysqli_query($query) or die('Error querying database.');

    }
    echo "Customer Added";




    $appoint_id;
    $AppointStatus = false;


    if($connect->query($sql) === true) {
        $appoint_id = $connect->insert_id;
        $valid['appoint_id'] = $appoint_id; 

        $valid['appoint_id'] = $appoint_id; 




        $AppointStatus = true;
    }


    $AppointItemStatus = false;

    for($x = 0; $x < count($_POST['serviceName']); $x++) {          
        $updateServiceQuantitySql = "
SELECT service.quantity 
  FROM service 
 WHERE service.service_id = ".$_POST['serviceName'][$x]."";
        $updateServiceQuantityData = $connect->query($updateServiceQuantitySql);


        while ($updateServiceQuantityResult = $updateServiceQuantityData->fetch_row()) {
            $updateQuantity[$x] = $updateServiceQuantityResult[0] - $_POST['quantity'][$x];                         
                // update  table
                $updateServiceTable = "
UPDATE service 
   SET quantity = '".$updateQuantity[$x]."' 
 WHERE service_id = ".$_POST['serviceName'][$x]."";
                $connect->query($updateServiceTable);

                $appointItemSql = "
INSERT INTO point_item 
( appoint_id
, service_id
, quantity
, rate
, total
, appoint_item_id
) VALUES 
( '$appoint_id'
, '".$_POST['serviceName'][$x]."'
, '".$_POST['quantity'][$x]."'
, '".$_POST['rateValue'][$x]."'
, '".$_POST['totalValue'][$x]."', 1)";

                $connect->query($appointItemSql);       

                if($x == count($_POST['serviceName'])) {
                    $appointItemStatus = true;
                }       
        } // while  
    } // /for quantity

    $valid['success'] = true;
    $valid['messages'] = "Successfully Added";      

    $connect->close();

    echo json_encode($valid);

} // /if $_POST
// echo json_encode($valid);

上面的代码有效，问题是记录显示错误以添加唯一日期。但是，对于重复记录，它无法添加。我需要帮助来创建一个独特的日期和时间，以避免重复约会，使约会在被删除之前是唯一的。

如果在输入数据时发现重复行，则组合应显示已列出约会的消息。如果在表单上输入约会日期时未找到重复行，则应将其插入数据库并显示消息“已添加”。我不确定选择或插入的正确方法。