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Updating clause used in instead of trigger

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Foreign tables do not support the TRUNCATE statement at all.On views, triggers can be defined to execute instead of triggers are fired once for each row that needs to be modified in the view.This is the same as a regular trigger except that the timing of the trigger firing can be adjusted using SET CONSTRAINTS. They can be fired either at the end of the statement causing the triggering event, or at the end of the containing transaction; in the latter case they are said to be deferred.A pending deferred-trigger firing can also be forced to happen immediately by using The name to give the new trigger.

If a trigger event occurs, the trigger's function is called at the appropriate time to handle the event.Both the WHEN clause and the trigger actions may access elements of the row being inserted, deleted or updated using references of the form "NEW.column-name" and "OLD.column-name", where column-name is the name of a column from the table that the trigger is associated with.OLD and NEW references may only be used in triggers on events for which they are relevant, as follows: If a WHEN clause is supplied, the SQL statements specified are only executed if the WHEN clause is true.But there's a dependency problem (manytomany and manytoone associations must be updated as well) which implies coding (one way or another) all the dependancies and updates that come with the tables (which is not acceptable).So I'm thinking about doing all the work on the database server side. The problem is that I have to "archive" the current record before modifying it.It is the responsibility of the trigger's function to perform the necessary modifications to the underlying base tables and, where appropriate, return the modified row as it will appear in the view.