Question

我写了一个简单的PHP代码来连接到mysql服务器，如下所示

    <?php

$username = "root";
$password = "Kepwd";
$hostname = "localhost:81";

//connection to the database
$dbhandle = mysqli_connect($hostname, $username, $password)
  or die("Unable to connect to MySQL");
echo "Connected to MySQL<br>";

 ?>

但这会产生以下错误。我在google和stactoverflow中找到了一些关于此问题的主题。但那些对我没有帮助。请有人帮帮我吗？

    ( ! ) Warning: mysqli_connect(): MySQL server has gone away in C:\wamp\www\SSDConsultingNew\inc\test.php on line 8
Call Stack
#   Time    Memory  Function    Location
1   0.0014  240936  {main}( )   ..\test.php:0
2   0.0014  241528  mysqli_connect ( )  ..\test.php:8

( ! ) Warning: mysqli_connect(): Error while reading greeting packet. PID=10612 in C:\wamp\www\SSDConsultingNew\inc\test.php on line 8
Call Stack
#   Time    Memory  Function    Location
1   0.0014  240936  {main}( )   ..\test.php:0
2   0.0014  241528  mysqli_connect ( )  ..\test.php:8

( ! ) Warning: mysqli_connect(): (HY000/2006): MySQL server has gone away in C:\wamp\www\SSDConsultingNew\inc\test.php on line 8
Call Stack
#   Time    Memory  Function    Location
1   0.0014  240936  {main}( )   ..\test.php:0
2   0.0014  241528  mysqli_connect ( )  ..\test.php:8
Unable to connect to MySQL

Answer 1

错误在于：

$hostname = "localhost:81";

您没有连接到MySQL，而是连接到Apache服务器。如果您没有更改MySQL端口，请使用

$hostname = "localhost";

Answer 2

在再次输入数据库名称后忘记指定数据库名称。语法应该是这样的

<?php
$con = mysqli_connect("localhost","my_user","my_password","my_db");
// Check connection
if (mysqli_connect_errno())
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
?>

警告：mysqli_connect（）：MySQL服务器已经消失

2 个答案: