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What should I do if php connects to mysql8 and reports an error?

藏色散人
藏色散人Original
2023-01-18 10:28:013622browse

Solution to PHP error when connecting to mysql8: 1. Turn off the comment in front of "mysql_native_password" in "/etc/my.cnf"; 2. Enter mysql and update the password with "mysql_native_password" That’s it.

What should I do if php connects to mysql8 and reports an error?

The operating environment of this tutorial: CentOS 7 system, mysql8 version, DELL G3 computer

#What should I do if php connects to mysql8 and reports an error?

Solution to PHP connection failure to MYSQL8

##0x01 Question

In the evening, a student in the group said that

php exploded and didn’t come out for two hours.
What should I do if php connects to mysql8 and reports an error?

No matter how you look at it, there is no problem. Anyway, the connection keeps failing.

I asked him to add

mysqli_error() and there was no output. I checked the PHP related components and the mysql log but there was no response. Since it is a cloud host, I tried Changed localhost to 127.0.0.1, still to no avail.

Then I checked the

mysql version, mysql8, which is too difficult for people who are still using mysql5, so I checked it out After getting an update on mysql8, I picked up the child, haha.

What should I do if php connects to mysql8 and reports an error?

Simply put, in

mysql8, a new verification method caching_sha2_password appeared, and this method became the new The verification mechanism is also processed in this way by default when configuring the password. The original mysql_native_password is replaced. This is why php cannot be connected.

For detailed information, please see this link:


https://dev.mysql.com/doc/refman/8.0/en/upgrading-from-previous-series.html#upgrade-caching -sha2-password

0x02 Solution

1. In

/etc/my.cnf(centos for students ) Turn off the comment in front of mysql_native_password.. That is, change back to the old verification method:

[mysqld]
default_authentication_plugin=mysql_native_password
2. Enter

mysql and update the password using mysql_native_password.

mysql>ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'password';
mysql>flush privileges;
Or you can add a new user.

mysql>CREATE USER 'test'@'%' IDENTIFIED WITH mysql_native_password BY 'password';
mysql>GRANT ALL PRIVILEGES ON *.* TO 'test'@'%';
mysql>flush privileges;
The problem is successfully solved.

0x03 Follow-up

After thinking about it, I can’t use

php and I can’t use the new verification method. Then this is not useless, so It can certainly be solved using php, so I looked at it again and found something.
What should I do if php connects to mysql8 and reports an error?

There are indeed new components

mysql_xdevapi that can be supported, but before php7.2.4 it was either php PDO or php mysqli cannot support the new verification method.
What should I do if php connects to mysql8 and reports an error?

Since the problem has been solved, I will not try this method again. Please try it again when it is used in the future and record it!

Recommended learning: "

PHP Video Tutorial"

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