graphql-engine/server/src-rsr/trigger.sql.shakespeare

CREATE OR REPLACE function hdb_views.#{qualifiedTriggerName}() RETURNS trigger
  LANGUAGE plpgsql
  AS $$
  DECLARE
    _old record;
    _new record;
    _data json;
  BEGIN
    IF TG_OP = 'UPDATE' THEN
      _old := #{oldRow};
      _new := #{newRow};
    ELSE
    /* initialize _old and _new with dummy values for INSERT and UPDATE events*/
      _old := row((select 1));
      _new := row((select 1));
    END IF;
    _data := json_build_object(
      'old', #{oldPayloadExpression},
      'new', #{newPayloadExpression}
    );
    BEGIN
      IF (TG_OP <> 'UPDATE') OR (_old <> _new) THEN
        PERFORM hdb_catalog.insert_event_log(CAST(TG_TABLE_SCHEMA AS text), CAST(TG_TABLE_NAME AS text), CAST('#{name}' AS text), TG_OP, _data);
      END IF;
      EXCEPTION WHEN undefined_function THEN
        IF (TG_OP <> 'UPDATE') OR (_old *<> _new) THEN
          PERFORM hdb_catalog.insert_event_log(CAST(TG_TABLE_SCHEMA AS text), CAST(TG_TABLE_NAME AS text), CAST('#{name}' AS text), TG_OP, _data);
        END IF;
    END;

    RETURN NULL;
  END;
$$;
DROP TRIGGER IF EXISTS #{qualifiedTriggerName} ON #{qualifiedTable};
CREATE TRIGGER #{qualifiedTriggerName} AFTER #{operation} ON #{qualifiedTable} FOR EACH ROW EXECUTE PROCEDURE hdb_views.#{qualifiedTriggerName}();