I changed info about database accidentally in wp-config.php and can not access to wordpress since then

I changed info about database accidently in wp-config.php and can not access to wordpress since then, when enter the ip address, instead of the wordpress interface, I only get the “Error establishing a database connection” and couldn’t get back to normal.

Anyone can help?

Much appreciated!

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if you know the login credential for the mysql, then follow “Step 2 — Check Database Login Credentials”