Php mysqli_query()警告参数1为mysqli,给定null。数据库查询失败
我收到这样的警告:Php mysqli_query()警告参数1为mysqli,给定null。数据库查询失败,php,Php,我收到这样的警告: ( ! ) Warning: mysqli_query() expects parameter 1 to be mysqli, null given in C:\wamp\www\inc\functions.php on line 73 Call Stack # Time Memory Function Location 1 0.0003 251048 {main}( ) ..\manage_user.php:0 2 0.0012 2950
( ! ) Warning: mysqli_query() expects parameter 1 to be mysqli, null given in C:\wamp\www\inc\functions.php on line 73
Call Stack
# Time Memory Function Location
1 0.0003 251048 {main}( ) ..\manage_user.php:0
2 0.0012 295000 find_all_users( ) ..\manage_user.php:8
3 0.0012 295376 mysqli_query ( ) ..\functions.php:73
Database query failed.
我已经阅读了一些关于它的帖子,从中我可以理解mysqli_查询($db,$query)的第一个字符串中的错误
这将是$db这是我觉得奇怪的。mysqli_query($db,$query)适用于所有其他函数。但是当我调用find_all_users()函数时,我得到了警告
dbcon:
define("DB_SERVER", "localhost");
define("DB_USER", "*******");
define("DB_PASS", "*******");
define("DB_NAME", "*******");
// 1. Create a database connection
$db = mysqli_connect(DB_SERVER, DB_USER, DB_PASS, DB_NAME);
// Test if connection succeeded
if(mysqli_connect_errno()) {
die("Database connection failed: " .
mysqli_connect_error() .
" (" . mysqli_connect_errno() . ")"
);
}
职能:
function find_all_users() {
global $db;
$query = "SELECT * ";
$query .= "FROM user ";
$query .= "ORDER BY username ASC";
$user_set = mysqli_query($db, $query);
confirm_query($user_set);
return $user_set;
}
function confirm_query($result_set) {
if (!$result_set) {
die("Database query failed.");
}
}
我收到警告的页面:
<?php
require_once($_SERVER['DOCUMENT_ROOT'].'/session/session.php');
require_once($_SERVER['DOCUMENT_ROOT'].'/inc/functions.php');
include($_SERVER['DOCUMENT_ROOT'].'/inc/header.php');
include($_SERVER['DOCUMENT_ROOT'].'/inc/nav_ribbon.php');
$user_set = find_all_users();
?>
<body>
<div id="p2dbg">
<div id="p2dcontent">
<?php include($_SERVER['DOCUMENT_ROOT'].'/inc/left_container.php'); ?>
<div id="page">
<?php echo message(); ?>
</div>
</div>
<?php include($_SERVER['DOCUMENT_ROOT'].'/inc/footer.php'); ?>
</div>
</body>
</html>
为null
,因为未包括dbcon
文件:
include('dbcon.php');
session_start();
您在哪里包括dbcon
?您需要包括/要求dbcon
,然后才能调用find\u所有用户
您是否在dbcon
中将$db
设置为全局设置?@AndrewJackman我认为这不是一项要求。它们不需要声明为全局的,只是因为它们的位置。28小时后我看不清了。。。谢谢我想我应该昏过去,因为我犯了愚蠢的错误。