Facebook登录，有些疑惑

Question

I have a problem. I have database table for registered users. And I have two ways to register a user, manually (using a form) or with facebook. When the user do it using facebook, it saves in that database table the email, name and some others, but what do I put in the password. Can I get also the password, is that unsafe? Should the user could login manually (using a login form) to acess the account he registered using facebook, if so with what password?
I'm new to social logins, do you recommend to have diferente tables for users registered manually and for users registered with social? Thank you

Answer 1

One way:

• Add a field for the Facebook ID to your table (VARCHAR(255))
• If the user authorizes with Facebook Login, check if his User ID is already in your database
• If not, present a form where he can set his email and password

That way, you can let the user login with Facebook Login AND with email/password later.