Initial commit

2026-07-12 14:34:52 +04:00
commit 3abf6bd9c2
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+-- WARNING: In SQLite DELIMITER doesn't work, so this file is handled in a special way
+
+DELIMITER $$
+
+-- INFO: ----- TICKET -----
+
+-- Create trigger to validate seat number before inserting a ticket
+
+-- INSERT
+
+CREATE TRIGGER check_seat_number_before_insert
+BEFORE INSERT ON tickets
+WHEN EXISTS (
+    SELECT 1
+    FROM sessions s
+    INNER JOIN halls h ON s.hall_id = h.hall_id
+    WHERE s.session_id = NEW.session_id
+      AND NEW.seat_number > h.capacity
+)
+BEGIN
+    SELECT RAISE(FAIL, 'Error 1001: Seat number exceeds hall capacity');
+END$$
+
+-- UPDATE
+
+CREATE TRIGGER check_seat_number_before_update
+BEFORE UPDATE ON tickets
+WHEN EXISTS (
+    SELECT 1
+    FROM sessions s
+    INNER JOIN halls h ON s.hall_id = h.hall_id
+    WHERE s.session_id = NEW.session_id
+      AND NEW.seat_number > h.capacity
+)
+BEGIN
+    SELECT RAISE(FAIL, 'Error 1001: Seat number exceeds hall capacity');
+END$$
+
+-- Check if the ticket purchase time is later than the session start time
+
+-- INSERT
+
+CREATE TRIGGER prevent_late_ticket_purchase_before_insert
+BEFORE INSERT ON tickets
+WHEN EXISTS (
+    SELECT 1
+    FROM sessions
+    WHERE session_id = NEW.session_id
+      AND DATETIME(NEW.sold_at) >= DATETIME(begin_at)
+)
+BEGIN
+    SELECT RAISE(FAIL, 'Error 1002: Cannot purchase ticket after the session has started');
+END$$
+
+-- UPDATE
+
+CREATE TRIGGER prevent_late_ticket_purchase_before_update
+BEFORE UPDATE ON tickets
+WHEN EXISTS (
+    SELECT 1
+    FROM sessions
+    WHERE session_id = NEW.session_id
+      AND DATETIME(NEW.sold_at) >= DATETIME(begin_at)
+)
+BEGIN
+    SELECT RAISE(FAIL, 'Error 1002: Cannot purchase ticket after the session has started');
+END$$
+
+
+-- INFO: ----- REFUND -----
+
+-- Create trigger to prevent selling a ticket after the session has started
+
+-- INSERT
+
+CREATE TRIGGER prevent_late_refunds_before_insert
+BEFORE INSERT ON refunds
+WHEN EXISTS (
+    SELECT 1
+    FROM sessions s
+    JOIN tickets t ON s.session_id = t.session_id
+      AND t.ticket_id = NEW.ticket_id
+      WHERE DATETIME(NEW.refund_at) >= DATETIME(s.begin_at)
+)
+BEGIN
+    SELECT RAISE(FAIL, 'Error 1003: Refunds cannot be made after the session has started');
+END$$
+
+-- UPDATE 
+
+CREATE TRIGGER prevent_late_refunds_before_update
+BEFORE UPDATE ON refunds
+WHEN EXISTS (
+    SELECT 1
+    FROM sessions s
+    JOIN tickets t ON s.session_id = t.session_id
+      AND t.ticket_id = NEW.ticket_id
+      WHERE DATETIME(NEW.refund_at) >= DATETIME(s.begin_at)
+)
+BEGIN
+    SELECT RAISE(FAIL, 'Error 1003: Refunds cannot be made after the session has started');
+END$$
+
+
+-- Create a trigger to check if the refund amount is greater than the ticket sale amount
+
+-- INSERT
+
+CREATE TRIGGER validate_refund_amount_before_insert
+BEFORE INSERT ON refunds
+WHEN NEW.refund_amount > (
+    SELECT ticket_price
+    FROM sessions s
+    JOIN tickets t ON s.session_id = t.session_id
+    WHERE t.ticket_id = NEW.ticket_id
+)
+BEGIN
+    SELECT RAISE(FAIL, 'Error 1004: Refund amount cannot exceed the sale amount');
+END$$
+
+-- UPDATE
+
+CREATE TRIGGER validate_refund_amount_before_update
+BEFORE UPDATE ON refunds
+WHEN NEW.refund_amount > (
+    SELECT ticket_price
+    FROM sessions s
+    JOIN tickets t ON s.session_id = t.session_id
+    WHERE t.ticket_id = NEW.ticket_id
+)
+BEGIN
+    SELECT RAISE(FAIL, 'Error 1004: Refund amount cannot exceed the sale amount');
+END$$
+
+-- Create a trigger to check if the refund date is earlier than the sale date
+
+-- INSERT
+
+CREATE TRIGGER validate_refund_date_before_insert
+BEFORE INSERT ON refunds
+WHEN EXISTS (
+    SELECT 1
+    FROM tickets
+    WHERE ticket_id = NEW.ticket_id
+      AND DATETIME(NEW.refund_at) <= DATETIME(sold_at)
+)
+BEGIN
+    SELECT RAISE(FAIL, 'Error 1005: Refund date cannot be earlier than the sale date or equal to it');
+END$$
+
+-- UPDATE
+
+CREATE TRIGGER validate_refund_date_before_update
+BEFORE UPDATE ON refunds
+WHEN EXISTS (
+    SELECT 1
+    FROM tickets
+    WHERE ticket_id = NEW.ticket_id
+      AND DATETIME(NEW.refund_at) <= DATETIME(sold_at)
+)
+BEGIN
+    SELECT RAISE(FAIL, 'Error 1005: Refund date cannot be earlier than the sale date or equal to it');
+END$$
+
+-- INFO: ----- SESSION -----
+
+-- Trigger to prevent overlapping sessions
+
+--INSERT
+
+CREATE TRIGGER prevent_overlapping_sessions_before_insert
+BEFORE INSERT ON sessions
+WHEN EXISTS (
+    SELECT 1
+    FROM sessions s
+    JOIN movies m_existing ON s.movie_id = m_existing.movie_id
+    JOIN movies m_new ON NEW.movie_id = m_new.movie_id
+    WHERE s.hall_id = NEW.hall_id
+      AND (
+          -- The new movie starts within an already occupied time slot  
+          NEW.begin_at < DATETIME(s.begin_at, '+' || m_existing.duration || ' minutes')  
+          -- Or the existing movie starts within the new movie's time slot  
+          AND s.begin_at < DATETIME(NEW.begin_at, '+' || m_new.duration || ' minutes')
+      )
+)
+BEGIN
+    SELECT RAISE(FAIL, 'Error 1006: The new session overlaps with an ongoing movie in the hall');
+END$$
+
+-- UPDATE
+
+CREATE TRIGGER prevent_overlapping_sessions_before_update
+BEFORE UPDATE ON sessions
+WHEN EXISTS (
+    SELECT 1
+    FROM sessions s
+    JOIN movies m_existing ON s.movie_id = m_existing.movie_id
+    JOIN movies m_new ON NEW.movie_id = m_new.movie_id
+    WHERE s.hall_id = NEW.hall_id
+      AND (
+          -- The new movie starts within an already occupied time slot  
+          NEW.begin_at < DATETIME(s.begin_at, '+' || m_existing.duration || ' minutes')  
+          -- Or the existing movie starts within the new movie's time slot  
+          AND s.begin_at < DATETIME(NEW.begin_at, '+' || m_new.duration || ' minutes')
+      )
+)
+BEGIN
+    SELECT RAISE(FAIL, 'Error 1006: The new session overlaps with an ongoing movie in the hall');
+END$$
+
+DELIMITER ;
+