30 lines
769 B
SQL
30 lines
769 B
SQL
-- PL/Python trigger to verify terms for validity
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-- To (re)install:
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-- su postgres
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-- psql ceo < verify_term.sql
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-- To uninstall:
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-- su postgres
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-- echo 'DROP FUNCTION verify_term() CASCADE' | psql ceo
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DROP FUNCTION verify_term() CASCADE;
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CREATE FUNCTION verify_term() RETURNS trigger AS '
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import re
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# update this line if the term format changes
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TERM_REGEX = "^[wsf][0-9]{4}$"
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term = TD["new"]["term"]
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if term and not re.match(TERM_REGEX, term):
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plpy.error("term is invalid (%s)" % term)
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' LANGUAGE plpythonu;
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CREATE TRIGGER verify_term_insert BEFORE INSERT on terms
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FOR ROW EXECUTE PROCEDURE verify_term();
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CREATE TRIGGER verify_term_update BEFORE UPDATE ON terms
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FOR ROW EXECUTE PROCEDURE verify_term();
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