[英]Check if two column match on SQL PHP
I have a form where the user has to enter their reservation id and last name. 我有一个表格,用户必须输入他们的预订ID和姓氏。 If these two values match in the database then I need to return the corresponding values from the database. 如果这两个值在数据库中匹配,那么我需要从数据库中返回相应的值。
I have two files, one that is html where I use ajax and one php file. 我有两个文件,一个是html,我使用ajax,另一个是php文件。 When clicking on the button, nothing is being returned, I am not seeing any specific errors and I am sure that the value I put in are correct. 单击该按钮时,未返回任何内容,没有看到任何特定的错误,并且我确定输入的值正确。
<script>
var ajax = getHTTPObject();
function getHTTPObject()
{
var xmlhttp;
if (window.XMLHttpRequest) {
// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
} else if (window.ActiveXObject) {
// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
} else {
//alert("Your browser does not support XMLHTTP!");
}
return xmlhttp;
}
function updateCityState()
{
if (ajax)
{
var reservation_id = document.getElementById("reservation_id").value;
var guest_last_name = document.getElementById("guest_last_name").value;
if(reservation_id)
{
var param = "?reservation_id=" + reservation_id + "&guest_last_name=" + guest_last_name;
var url = "test04.php";
ajax.open("GET", url + param, true);
ajax.onreadystatechange = handleAjax;
ajax.send(null);
}
}
}
function handleAjax()
{
if (ajax.readyState == 4)
{
var guest_full_name = document.getElementById('guest_full_name');
var unit_number = document.getElementById('unit_number');
var floor = document.getElementById('floor');
var key_sa = document.getElementById('key_sa');
if(!!ajax.responseText) {
var result = JSON.parse(ajax.responseText);
if(!!result){
guest_full_name.innerHTML = (!!result.guest_full_name) ? result.guest_full_name : '';
unit_number.innerHTML = (!!result.unit_number) ? result.unit_number : '';
floor.innerHTML = (!!result.floor) ? result.floor : '';
key_sa.innerHTML = (!!result.key_sa) ? result.key_sa : '';
}
}
}
}
</script>
<p id='employee_name'></p>
<p id='employee_age'></p>
<p id='safe_code'></p>
My test04.php 我的test04.php
<?php
$conn = mysqli_connect("","","","");
$reservation_id = mysqli_real_escape_string($conn, $_GET['reservation_id']);
$guest_last_name = mysqli_real_escape_string($conn, $_GET['guest_last_name']);
$query = "SELECT reservation_id, guest_full_name, guest_last_name unit_number, floor, key_sa FROM reservations2 INNER JOIN guest ON (reservations2.reservation_id=guest.reservation_idg) INNER JOIN unit USING (unit_id) where reservation_id ='".$reservation_id."'AND guest_last_name ='".$guest_last_name."";
$result = mysqli_query($conn, $query) or die(mysql_error());
$response = array();
if(mysqli_num_rows($result) > 0) {
while($row = mysqli_fetch_assoc($result)) {
$response['guest_full_name'] = ($row['guest_full_name'] != '') ? $row['guest_full_name'] : '';
$response['unit_number'] = ($row['unit_number'] != '') ? $row['unit_number'] : '';
$response['floor'] = ($row['floor'] != '') ? $row['floor'] : '';
$response['key_sa'] = ($row['key_sa'] != '') ? $row['key_sa'] : '';
}
}
echo json_encode($response, true);
?>
I am not seeing any specific errors 我没有看到任何特定的错误
The logic of your PHP is unclear - your JSON data and the PHP array can't handle multiple records yet you process multiple records. PHP的逻辑尚不清楚-JSON数据和PHP数组无法处理多个记录,但您可以处理多个记录。 It would be nice to implement REST properly. 正确实现REST会很好。 This should also apply authentication and use CSRF for security - but I'll assume you left those out for illustrative purposes. 这也应该应用身份验证,并使用CSRF进行安全保护-但我假设您出于说明目的而将其省略。
Your code is not written to handle failures or missing data. 您的代码无法处理故障或丢失数据。 Consider (noting all the differences with what you posted): 考虑(注意与您发布的内容的所有差异):
<?php
$conn = mysqli_connect("","","","");
$response = array();
$reservation_id = mysqli_real_escape_string($conn, $_GET['reservation_id']);
$guest_last_name = mysqli_real_escape_string($conn, $_GET['guest_last_name']);
$query = "SELECT reservation_id, guest_full_name
, guest_last_name unit_number, floor, key_sa
FROM reservations2
INNER JOIN guest
ON (reservations2.reservation_id=guest.reservation_idg)
INNER JOIN unit USING (unit_id)
WHERE reservation_id ='".$reservation_id."'
AND guest_last_name ='".$guest_last_name."";
$result = mysqli_query($conn, $query);
if (!$result) {
$response['status']=503
$response['msg']="Error";
trigger_error(mysql_error());
finish($response);
exit;
}
$response['status']=200;
$response['msg']='OK';
$response['guest_full_name'] = htmlentities($_GET['guest_last_name']);
$response['reservations']=array();
while($row = mysqli_fetch_assoc($result)) {
$response['reservations'][]=array(
'unit_number'=>$row['unit_number'],
'floor'=>$row['floor'],
'key_sa'=>$row['floor_sa']);
}
}
finish($response);
exit;
function finish($response)
{
header("HTTP/1.1 $response[status] $response[msg]");
header("Content-type: application/json");
echo json_encode($response, true);
}
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