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