please tell me what is exception in this code

Question

NSString *qry=@"UPDATE TABLE USERBASIC SET F_NAME='%@',M_NAME='%@',L_NAME='%@' WHERE REGISTRATIONID='%@'";
NSString *updtQuery=[[NSString alloc] stringWithFormat:qry,fname.text,mname.text,lname.text,userInformationId];
NSLog(@"try UPDATE %@:",updtQuery);

this gives invalid argument exception.. :(

Answer 1

This:

[[NSString alloc] stringWithFormat...]

stringWithFormat is a class method; you use it as [NSString stringWithFormat: ...]

See also:

• Learning Objective-C: A Primer: Methods and Messaging (Apple)
• What is the difference between class and instance methods? (Previous Stack Overflow question)

Answer 2

Try this

NSString *updtQuery=[NSString stringWithFormat:qry,fname.text,mname.text,lname.text,userInformationId];

or

NSString *updtQuery=[[NSString alloc] initWithFormat:qry,fname.text,mname.text,lname.text,userInformationId];