Php mysql页面查看计数器

Question

我尝试制作一个简单的页面查看计数器。 每次页面刷新时，数字应增加+1。

当我在Phpmyadmin中执行代码时，它一切正常。但在PHP中，计数器返回，但不增加。我做错了什么？

<?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

您必须创建更新串入$sql变量之后做出mysqli_query电话。你现在正在做的只是用SELECT查询字符串覆盖它。

[...] 

$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); 

[...]