36 lines
840 B
MySQL
36 lines
840 B
MySQL
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ALTER TABLE collection ADD COLUMN online BOOLEAN NOT NULL DEFAULT FALSE;
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CREATE INDEX collection_online_idx ON collection (online);
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--
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-- trigger to run whenever a collection row is added/updated that fills in
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-- the online column in that collection row
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--
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CREATE OR REPLACE FUNCTION set_collection_row_online_column()
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RETURNS TRIGGER
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AS $set_collection_row_online_column$
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BEGIN
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IF NEW.quality = 'online' THEN
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NEW.online := TRUE;
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ELSE
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NEW.online := FALSE;
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END IF;
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RETURN NEW;
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END;
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$set_collection_row_online_column$ LANGUAGE plpgsql;
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CREATE TRIGGER collection_set_online_trigger
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BEFORE INSERT OR UPDATE ON collection
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FOR EACH ROW EXECUTE PROCEDURE set_collection_row_online_column();
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--
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-- fill in correct online column value in any existing collection rows
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--
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UPDATE collection
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SET online = TRUE
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WHERE quality = 'online';
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