举例:
@"create table student(stuid integer primary key autoincrement,name text,number integer,theory float,skills float,remark text)"
@"insert into student (name,number,theory,skills,remark) values('%@','%ld','%.1f','%.1f','%@')"
@"delete from student where stuid='%ld'"
@"update student set name='%@',number='%ld',theory='%.1f',skills='%.1f',remark='%@' where stuid=%ld"
@"select * from student"
@"select * from student where stuid = 1"
