The comments in the qa-external-users.php file should explain everything.
In your users table (the external one) you should have a unique way of identifying a user - most likely an ID number, but you could also just use the username or email address.
In MySQL that field will have a type. The function qa_get_mysql_user_column_type() should return what that type is. You can return any of these (inside a string):
-
SMALLINT
-
SMALLINT UNSIGNED
-
MEDIUMINT
-
MEDIUMINT UNSIGNED
-
INT
-
INT UNSIGNED
-
BIGINT
-
BIGINT UNSIGNED
-
VARCHAR(x) where x is the maximum length - for example, VARCHAR(30)
