问题
I wrote some function used by a php webpage, in order to interact with a mysql database. When I test them on my server I get this error:
"Connect failed: Access denied for user 'root'@'localhost' (using password: YES)"
I am able to use them on my pc (using XAMPP) and I can navigate through the tables of the database using the command line in the server. However, the webpage fails to connect. I've checked the password but with no results. It's correct (otherwise I could not log in to mysql from the command line).
The call of the function is the following:
$conn = new mysqli("localhost", "root", "password", "shop");
Do I have to set something in my server? Thanks
Edit: PHP version 5.3.3-7+squeeze1 mysql version: 5.1.49-3 both on debian
回答1:
I solved in this way: I logged in with root username
mysql -u root -p -h localhost
I created a new user with
CREATE USER 'francesco'@'localhost' IDENTIFIED BY 'some_pass';
then I created the database
CREATE DATABASE shop;
I granted privileges for new user for this database
GRANT ALL PRIVILEGES ON shop.* TO 'francesco'@'localhost';
Then I logged out root and logged in new user
quit;
mysql -u francesco -p -h localhost
I rebuilt my database using a script
source shop.sql;
And that's it.. Now from php works without problems with the call
$conn = new mysqli("localhost", "francesco", "some_pass", "shop");
Thanks to all for your time :)
回答2:
Is there a user account entry in the DB for root@localhost? In MySQL you can set different user account permissions by host. There could be several different accounts with the same name combined with the host they are connecting from. The most common are root@127.0.0.1 and root@localhost. These can have different passwords and permissions. Make sure root@localhost exist and has the settings you expect.
I am willing to bet, based on your explanation, that this is the problem. Connecting from another PC uses a different account than root@localhost and the command line I think connects using root@127.0.0.1.
回答3:
From what you've said so far, it sounds like a problem where the MySQL driver in PHP5.3 has trouble connecting to the older MySQL version 4.1. Have a look on http://www.bitshop.com/Blogs/tabid/95/EntryId/67/PHP-mysqlnd-cannot-connect-to-MySQL-4-1-using-old-authentication.aspx
There's a similar question here with some useful answers, Cannot connect to MySQL 4.1+ using old authentication
SELECT `User`, `Host`, Length(`Password`) FROM mysql.user
This will return 16 for accounts with old passwords and 41 for accounts with new passwords (and 0 for accounts with no password at all, you might want to take care of those as well). Either use the user managements tools of the MySQL front end (if there are any) or
SET PASSWORD FOR 'User'@'Host'=PASSWORD('yourpassword');
FLUSH Privileges
回答4:
I had this problem too. But this was because of another reason.
My password began with character $... e.g. $MyPassword
I've changed it to #MyPassword and the problem is solved.
回答5:
Here maybe?
I believe that the code should be:
$connect = new mysqli("host", "root", "", "dbname");
because root does not have a password. the (using password: YES) is saying "you're using a password with this user"
回答6:
TIP:
comment out pid and socket file, if you can't connect to server..
mysql could be connecting with incorrect pid and/or socket file,
so when you try to connect to server trough command-line it "looks"
at the incorrect pid/socket file...
### comment out pid and socket file, if you can't connect to server..
#pid-file=/var/run/mysql/mysqld.pid #socket=/var/lib/mysql/mysql.sock
回答7:
Most likely it is not identifying your user properly. root@localhost. Select the Mysql version your MAMP is using.
/Applications/MAMP/Library/bin/mysqldump -uroot -p db_name > test_db_dump.sql
I actually wrote an alias on my computer so I don't have to remember how to get to the bin directory.
alias mysqldumpMAMP='/Applications/MAMP/Library/bin/mysqldump'
Which allows me to run this:
mysqldumpMAMP -uroot -p db_name > test_db_dump.sql
You can save an alias in your bash profile ~/.bash_profile or ~/.bash_rc
回答8:
Easy.
open xampp control panel -> Config -> my.ini edit with notepad. now add this below [mysqld]
skip-grant-tables
Save. Start apache and mysql.
I hope help you
回答9:
May be there password is not set and you are passing password as argument. Try ommitting password argument during connection..
回答10:
Edit your privileges on PHPmyAdmin (WAMP), Note that your password and user name has not been created. So do create or edit it, that it might work with your sql connection in your php. Hope it works
回答11:
Try initializing your variables and use them in your connection object:
$username ="root";
$password = "password";
$host = "localhost";
$table = "shop";
$conn = new mysqli("$host", "$username", "$password", "$table");
来源：https://stackoverflow.com/questions/59172599/how-do-i-fix-this-sql-error-on-this-github-project