Update textfield data issues in fmdb

output imageUpdate my data using FMDB. I used this following code:

BOOL success = [Database executeUpdate:[NSString stringWithFormat:@"UPDATE UserTbl SET eventname = '%@', eventdate = '%@' where studentid = %d",Reminder.EventTitleString,Reminder.EventDateString,Reminder.ReminderID]];

I have to insert the data in uitableview and then the added data will be edited that will be save in my database.

https://www.dropbox.com/home?preview=Simulator+Screen+Shot+15-Jun-2016+1.36.04+pm.png