本质上,我正在尝试以 JSON 格式打印信息,以便可以与我的应用程序进行通信,但由于某些奇怪的原因,我无法从 php 脚本连接到 MySQL 数据库。可能是什么导致了错误:警告:mysql_connect() [function.mysql-connect]: Lost connection to MySQL server during query in /srv/disk11/1158855/www/(myphpwebsite)/lib.php on line 13未连接:查询期间与 MySQL 服务器的连接丢失。
此外,第 13 行表示 lib.php 中的行:
mysql_connect ( $dbhost, $dbuser, $dbpass) or die("Could not connect: ".mysql_error());
还应该注意的是,这是对上一个问题的后续处理,以防有人想追查源头:MySQL issue connected to site with php。
最后,我从本地主机和使用 mysql 的远程服务器都收到相同的错误
库文件
<?
//Database Information
$dbhost = "31.170.160.76";
$dbname = "testdatabase";
$dbuser = "(personalinformation)";
$dbpass = "tested123";
//Connect to database
mysql_connect ( $dbhost, $dbuser, $dbpass) or die("Could not connect: ".mysql_error());
mysql_select_db($dbname) or die(mysql_error());
//executes a given sql query with the params and returns an array as result
function query() {
global $link;
$debug = false;
//get the sql query
$args = func_get_args();
$sql = array_shift($args);
//secure the input
for ($i=0;$i<count($args);$i++) {
$args[$i] = urldecode($args[$i]);
$args[$i] = mysqli_real_escape_string($link, $args[$i]);
}
//build the final query
$sql = vsprintf($sql, $args);
if ($debug) print $sql;
//execute and fetch the results
$result = mysqli_query($link, $sql);
if (mysqli_errno($link)==0 && $result) {
$rows = array();
if ($result!==true)
while ($d = mysqli_fetch_assoc($result)) {
array_push($rows,$d);
}
//return json
return array('result'=>$rows);
} else {
//error
return array('error'=>'Database error');
}
}
//loads up the source image, resizes it and saves with -thumb in the file name
function thumb($srcFile, $sideInPx) {
$image = imagecreatefromjpeg($srcFile);
$width = imagesx($image);
$height = imagesy($image);
$thumb = imagecreatetruecolor($sideInPx, $sideInPx);
imagecopyresized($thumb,$image,0,0,0,0,$sideInPx,$sideInPx,$width,$height);
imagejpeg($thumb, str_replace(".jpg","-thumb.jpg",$srcFile), 85);
imagedestroy($thumb);
imagedestroy($image);
}
?>
索引.php
<?
session_start();
require("lib.php");
require("api.php");
header("Content-Type: application/json");
switch ($_POST['command']) {
case "login":
login($_POST['username'], $_POST['password']); break;
case "register":
register($_POST['username'], $_POST['password']); break;
}
exit();
?>
api.php
<?php
function errorJson($msg){
print json_encode(array('error'=>$msg));
exit();
}
function register($user, $pass) {
//check if username exists
$login = query("SELECT username FROM login WHERE username='%s' limit 1", $user);
if (count($login['result'])>0) {
errorJson('Username already exists');
//try to register the user
$result = query("INSERT INTO login(username, pass) VALUES('%s','%s')", $user, $pass);
if (!$result['error']) {
//success
login($user, $pass);
} else {
//error
errorJson('Registration failed');
}
}
}
function login($user, $pass) {
$result = query("SELECT IdUser, username FROM login WHERE username='%s' AND pass='%s' limit 1", $user, $pass);
if (count($result['result'])>0) {
//authorized
$_SESSION['IdUser'] = $result['result'][0]['IdUser'];
print json_encode($result);
} else {
//not authorized
errorJson('Authorization failed');
}
}
?>