39 lines
921 B
MySQL
39 lines
921 B
MySQL
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/*
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* Trigger declarations for hpr_hpr
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*
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*/
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--
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-- Table 'log' to hold details of certain background activities invoked by
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-- stored procedures and triggers
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--
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DROP TABLE IF EXISTS log;
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CREATE TABLE log (
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id int(5) NOT NULL AUTO_INCREMENT,
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stamp timestamp DEFAULT now(),
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message text NOT NULL,
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PRIMARY KEY (id)
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);
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--
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-- When an episode is added to the eps table check whether there is an
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-- entry in the reservations table with the same id. If there is, delete
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-- it. Log the deletion in the log table.
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--
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DROP TRIGGER IF EXISTS check_reservations;
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DELIMITER $$
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CREATE TRIGGER check_reservations BEFORE INSERT ON eps
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FOR EACH ROW
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BEGIN
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IF EXISTS(SELECT id FROM reservations WHERE id = NEW.id) THEN
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DELETE FROM reservations WHERE id = NEW.id;
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INSERT INTO log (message) VALUES(concat('DELETE FROM reservations WHERE id = ',NEW.id));
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END IF;
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END;
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$$
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DELIMITER ;
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/*
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vim: syntax=sql ai tw=75:
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*/
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