31 lines
918 B
MySQL
31 lines
918 B
MySQL
|
-- PL/Python trigger to verify student ids for validity
|
||
|
|
-- Dedicated to office staff who can't type student ids.
|
||
|
|
|
||
|
|
-- To (re)install:
|
||
|
|
-- su postgres
|
||
|
|
-- psql ceo < verify_studentid.sql
|
||
|
|
|
||
|
|
-- To uninstall:
|
||
|
|
-- su postgres
|
||
|
|
-- echo 'DROP FUNCTION verify_studentid() CASCADE' | psql ceo
|
||
|
|
|
||
|
|
DROP FUNCTION verify_studentid() CASCADE;
|
||
|
|
|
||
|
|
CREATE FUNCTION verify_studentid() RETURNS trigger AS '
|
||
|
|
import re
|
||
|
|
|
||
|
|
# update this line if the student id format changes
|
||
|
|
STUDENTID_REGEX = "^[0-9]{8}$"
|
||
|
|
|
||
|
|
studentid = TD["new"]["studentid"]
|
||
|
|
if studentid and not re.match(STUDENTID_REGEX, studentid):
|
||
|
|
plpy.error("student id is invalid (%s)" % studentid)
|
||
|
|
|
||
|
|
' LANGUAGE plpythonu;
|
||
|
|
|
||
|
|
CREATE TRIGGER verify_studentid_insert BEFORE INSERT on members
|
||
|
|
FOR ROW EXECUTE PROCEDURE verify_studentid();
|
||
|
|
|
||
|
|
CREATE TRIGGER verify_studentid_update BEFORE UPDATE ON members
|
||
|
|
FOR ROW EXECUTE PROCEDURE verify_studentid();
|