To restore a MySQL database you can use a graphical interface such as phpmysql, however this can be done quite simply from the command line.

Last time I tried this it failed, I had to do this:

USE THIS METHOD NOW

sudo mysql -u root -pMyPassword alan_gallery < /home/pi/alan_gallery.sql

OLD METHOD

From the command line:

First you must login to MySQL

      mysql -u root -p — (the root part assumes root is your mysql username) 

To restore a database, use the following command:

      mysql database_name < database_name.sql 

In the code above, database_name is the name of the database you want to restore, and database_name.sql is the name of the backup file to be restored.

If you are trying to restore a single database from dump of all the databases, you have to let mysql know like this:

      mysql --one-database database_name < all_databases.sql