在Code Igniter中的set_userdata函数中添加数据库中的所有数据

I want to add the data of the user from the database in the set_userdata() function in Code Igniter and my code is not working. When i display the userdata() all of the fields from the database didnt displayed. Can you check whats wrong? NEWBIE IN CODE IGNITER HERE :(I want to add the data of the user from the dat