mysql_result（）预计参数1是资源，布尔在

我正在对PHP的一个恼人的错误给出的说法mysql_result（）预计参数1是资源，布尔在

Warning: mysql_result() expects parameter 1 to be resource, boolean given in C:\wamp\www\john\core\functions\users.php on line 16

Warning: mysql_result() expects parameter 1 to be resource, boolean given in C:\wamp\www\john\core\functions\users.php on line 24

线16是指

return (mysql_result(mysql_query("Select 'id' From 'users' where 'username'= '$username'"), 0 ,'id'));

而第24行是指

return (mysql_result(mysql_query("Select count('id') From 'users' where 'username'= '$username' AND 'hashed_password' = '$hash_password'"),0)==1)? $user_id : false;

我的查询是正确的，但我认为查询有一些问题。请帮我一把。

整个代码是在这里

<?php 
function user_exists($username){ 
    $username = sanitize($username); 
    return(mysql_result(mysql_query("SELECT COUNT(`id`) FROM `users` WHERE `username` = '$username'") 
    , 0) == 1) ? true : false; 
} 

function user_active($username){ 
    $username = sanitize($username); 
    return(mysql_result(mysql_query("SELECT COUNT(`id`) FROM `users` WHERE `username` = '$username' AND `active` = 1") 
    , 0) == 1) ? true : false; 
} 

function user_id_from_username($username){ 
    $username = sanitize($username); 
    return (mysql_result(mysql_query("Select 'id' From 'users' where 'username'= '$username'"), 0 ,'id')); 
} 


function login($username,$password){ 
    $user_id = user_id_from_username($username); 
    $username = sanitize($username); 
    $hash_password = md5($password);  
    return (mysql_result(mysql_query("Select count('id') From 'users' where 'username'= '$username' AND 'hashed_password' = '$hash_password'"),0)==1)? $user_id : false; 
} 

?>

来源

2013-03-30 user1836957

'mysql_query'只返回成功的资源，否则返回'FALSE'。检查'mysql_query'是否成功。 – Tushar

@ user1836957你检查了答案吗？ –

问题是你用''周围的栏。它被视为字符串没有列名

变化

return (mysql_result(mysql_query("Select 'id' From 'users' where 'username'= '$username'"), 0 ,'id'));

到

return (mysql_result(mysql_query("Select `id` From `users` where `username`= '$username'"), 0 ,'id')); 

return (mysql_result(mysql_query("Select count(`id`) From `users` where `username`= 
'$username' AND `hashed_password` = '$hash_password'"),0)==1)? $user_id : false;

来源

2013-03-30 05:37:20

OP，注意反引号'\''和撇号'''之间的区别。当我学习时，我讨厌这个。 – Tushar

mysql_result（）预计参数1是资源，布尔在

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