Need to fetch the data from database and send sms to the contact stored in the database. Using ANDROID STUDIO and SQLITE database [on hold]

I am using sqlite database for storing and android studio for coding. I have to send sms to the contacts that are stored in the database after successful login. How can i fetch the data from the database? I mean how can i get the particular user details so that i can send sms to the contact that is stored in his record. Please help me if you can. URGENT HELP NEEDED.