Все базы данных в одной репе

triggers.sql

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+-- запросы для проверки триггеров
+-- select * from judge_statistics;
+
+-- insert into judge (name, category, region, federation) 
+-- values ('Иван Иванов', '1 категория', 'Санкт-Петербург', 'Федерация');
+-- select * from judge where name = 'Иван Иванов';
+-- select * from judge_statistics where id_judge = 154;
+
+-- insert into judge_request (name, category, region, federation, is_registered, id_competition, id_judge) 
+-- values ('Иван Иванов', '1 категория', 'Санкт-Петербург', 'Федерация', true, 401, 1);
+-- update judge_request set id_judge = 2 where id_judge = 1;
+-- delete from judge_request where name = 'Иван Иванов';
+
+-- delete from judge where name = 'Иван Иванов';
+
+-- таблица для ведения статистики
+create table judge_statistics (
+    id_judge integer primary key,
+    competition_count integer not null default 0,
+    foreign key (id_judge) references judge(id_judge)
+);
+
+
+-- добавление судьи
+create or replace function update_statistics_on_judge_insert()
+returns trigger as $$
+begin
+    insert into judge_statistics (id_judge, competition_count)
+    values (new.id_judge, 0);
+    return new;
+end;
+$$ language plpgsql;
+
+create trigger after_judge_insert
+after insert on judge
+for each row
+execute function update_statistics_on_judge_insert();
+
+-- удаление судьи
+create or replace function update_statistics_on_judge_delete()
+returns trigger as $$
+begin
+    delete from judge_statistics where id_judge = old.id_judge;
+    return old;
+end;
+$$ language plpgsql;
+
+create trigger after_judge_delete
+after delete on judge
+for each row
+execute function update_statistics_on_judge_delete();
+
+-- добавление заявки судьи
+create or replace function update_statistics_on_judge_request_insert()
+returns trigger as $$
+begin
+    update judge_statistics
+    set competition_count = competition_count + 1
+    where id_judge = new.id_judge;
+    return new;
+end;
+$$ language plpgsql;
+
+create trigger after_judge_request_insert
+after insert on judge_request
+for each row
+execute function update_statistics_on_judge_request_insert();
+
+-- удаление заявки судьи
+create or replace function update_statistics_on_judge_request_delete()
+returns trigger as $$
+begin
+    update judge_statistics
+    set competition_count = competition_count - 1
+    where id_judge = old.id_judge;
+    return old;
+end;
+$$ language plpgsql;
+
+create trigger after_judge_request_delete
+after delete on judge_request
+for each row
+execute function update_statistics_on_judge_request_delete();
+
+
+-- обновление заявки судьи
+create or replace function update_statistics_on_judge_request_update()
+returns trigger as $$
+begin
+    -- уменьшение счётчика у старого судьи
+    update judge_statistics
+    set competition_count = competition_count - 1
+    where id_judge = old.id_judge;
+
+    -- увеличение счётчика у нового судьи
+    update judge_statistics
+    set competition_count = competition_count + 1
+    where id_judge = new.id_judge;
+
+    return new;
+end;
+$$ language plpgsql;
+
+create trigger after_judge_request_update
+after update on judge_request
+for each row
+execute function update_statistics_on_judge_request_update();