User can't access a database

Question

In my PHP script, I\'m accessing two databases db1 and db2. I have a user myuser@localhost that can access db1 but can\'

Answer 1

localhost does not match % in MySQL. It seems like it should, but in fact it doesn't. You'd have to separately grant privileges to user@localhost, both for the USAGE privilege, and for the privileges on each database.

Or you can connect as user@127.0.0.1 which does match %. Using the IP address for localhost seems like it should work identically to localhost, but it doesn't. You need to have two lines in the mysql.user table (and also in the mysql.db table in your case) to enable both.

To demonstrate the difference between localhost and 127.0.0.1:

Connecting as mysql -h localhost uses the UNIX socket interface, and bypasses TCP/IP. This can be slightly better for performance, but it has the effect on grant matching described above.

You can force a local TCP/IP connection by connecting as mysql -h 127.0.0.1. Then it will pick up the grants you have made to myuser@%.

So to get the same user, password, and privileges for both the socket interface and the TCP/IP interface, you'd need to run all of the following statements:

GRANT USAGE ON *.* TO 'myuser'@'%' IDENTIFIED BY PASSWORD '*7733323232...'
GRANT USAGE ON *.* TO 'myuser'@'localhost' IDENTIFIED BY PASSWORD '*7733323232...'
GRANT ALL PRIVILEGES ON `db1`.* TO 'myuser'@'%'
GRANT ALL PRIVILEGES ON `db1`.* TO 'myuser'@'localhost'
GRANT ALL PRIVILEGES ON `db2`.* TO 'myuser'@'%'
GRANT ALL PRIVILEGES ON `db2`.* TO 'myuser'@'localhost'