Php mysql頁面查看計數器

Question

我嘗試製作一個簡單的頁面查看計數器。 每次頁面刷新時，數字應增加+1。

當我在Phpmyadmin中執行代碼時，它一切正常。但在PHP中，計數器返回，但不增加。我做錯了什麼？

<?php 
$username = "username"; 
$password = "password"; 
$hostname = "hostname"; 
$dbname = "dbname"; 


// Create connection 
$conn = new mysqli($hostname, $username, $password, $dbname); 
// Check connection 
if ($conn->connect_error) { 
die("Connection failed: " . $conn->connect_error); 
} 

$sql = "UPDATE `Games` SET `Played`= `Played`+1 WHERE 'ID'='3'"; 

$sql = "SELECT `Played` FROM `Games` WHERE `ID` = 3"; 

$result = mysqli_query($conn, $sql); 

if (mysqli_num_rows($result) > 0) { 
// output data of each row 
while($row = mysqli_fetch_assoc($result)) { 
    echo "" . $row[Played]. "<br>"; 
} 
} else { 
echo "0 results"; 
} 

$conn->close(); 
?> 

Answer 1

您必須創建更新串入$sql變量之後做出mysqli_query電話。你現在正在做的只是用SELECT查詢字符串覆蓋它。

[...] 

$sql = "UPDATE `Games` SET `Played`= `Played`+1 WHERE `ID`='3'"; 

$result = mysqli_query($conn, $sql); 

$sql = "SELECT `Played` FROM `Games` WHERE `ID` = 3"; 

$result = mysqli_query($conn, $sql); 

[...]