Disparador: mover elimina filas de tabla de archivo

Question

Tengo una tabla pequeña (~ 10 filas) restrictions llamada en mi base de datos PostgreSQL, donde se eliminan los valores e insertados en una base diaria.

Me gustaría tener una tabla llamada restrictions_deleted, donde cada fila que se elimina de restrictions se almacenará automáticamente. Desde restrictions tiene un ID de serie, no habrá duplicados.

¿Cómo escribo un disparador tal en PostgreSQL?

Answer 1

You just need to move the old data into the restrictions_deleted table before it gets deleted. This is done with the OLD data type. You can use a regulat INSERT statement and and use the OLD values as the values-to-be-inserted.

CREATE TRIGGER moveDeleted
BEFORE DELETE ON restrictions 
FOR EACH ROW
EXECUTE PROCEDURE moveDeleted();


CREATE FUNCTION moveDeleted() RETURNS trigger AS $$
    BEGIN
       INSERT INTO restrictions_deleted VALUES(OLD.column1, OLD.column2,...);
       RETURN OLD;
    END;
$$ LANGUAGE plpgsql;

Answer 2

If you are open to a different approach, Have you considered adding a 'deleted' Boolean flag to the table, or a 'deleted_at' timestamp instead.

Or better still, deny CRUD access to your database tables and handle the audit trail in your transactional API :)