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PHP错误Warning:mysql_query()解决方法_PHP

May 30, 2016 am 08:44 AM
php warning mistake

php提示错误:Warning: mysql_query() [function.mysql-query]: Access denied for user 'ODBC'@'localhost' (using password: NO)
代码:

<&#63;php 
class mysqlClass 
{ 
function mysqlClass($host='localhost',$user='root',$pw='',$db='mysql') 
{ 
$this->link=mysql_connect($host,$user,$pw); 
mysql_select_db($db); 
} 
function query($sql){ 
mysql_query($sql); 
} 
function __destruct(){ 
mysql_close($this->link); //multi construct will cause error 
} 
// liehuo,net 
} 
$db=new mysqlClass(); 
$db=new mysqlClass(); 
$db->query("select * from user"); 
Copy after login

原因:
mysqlClass第二次初使化时,先初使化mysqlClass,得到跟第一个$db相同的$this->link,然后调用__construct函数会把this->link关闭。
最后导致$db中mysql资源为空,弹出错误。
解决办法:
$db=$db?$db:new mysqlClass(); 
或者
$this->link=mysql_connect($host,$user,$pw,true);

希望提供的解决方法可以真正的帮助到大家。

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