Code Inspection: Suspicious code in triggers

Reports incorrect usages of transition table variables in triggers.

Example (HSQLDB):

CREATE TABLE foo(a INT);

CREATE TRIGGER trg
 AFTER DELETE ON foo
BEGIN
   SELECT * FROM NEW;
END;

CREATE TRIGGER trig AFTER INSERT ON foo
   REFERENCING OLD ROW AS newrow
   FOR EACH ROW WHEN (a > 1)
   INSERT INTO foo VALUES (1)

In HSQLDB, DELETE triggers may be used only with the OLD state while INSERT triggers may have only the NEW state. So, in the previous example, NEW in SELECT * FROM NEW; will be highlighted as well as OLD in REFERENCING OLD ROW AS newrow.