I am trying to create a rule that will increment the class.size in one table
when a student adds that class to their schedule in another table (module).
Basically, there are 3 tables involved:
class
module
student
When a student registers for their classes, the class.id is placed in its
respective module, the student.id is placed in module.student_id which is
combined with module.year to make up the primary key in the module table.
CREATE RULE class_size_increment_cq1 AS
ON INSERT TO module.c_q1
DO
SET class.size to class.size+1
WHERE class.id=module.c_q1;
This doesn't seem to be working. Would it be just as fast or faster to use
a transaction:
begin;
insert into module.c_q1.....
update class set class.size to class.size+1 where class.id=module.c_q1;
commit;
TIF,
Kurt
