Question

I have two simple (only for explain my problem) tables

1. X with columns (among others): IDX,CODE,NUMBER
2. Y with columns (among others): CODE,NUMBER,id_fromX

I want to (after insert or update table X) update table Y using variables from actual record from X.
To do this I try to use trigger (in table X) like below:

SET TERM ^^ ;
CREATE TRIGGER XYZFOR X ACTIVE AFTER INSERT OR UPDATE POSITION 0 AS
begin
  if  (new.CODE is distinct old.CODE)  then
  BEGIN
  EXECUTE STATEMENT ('UPDATE Y SET CODE=:old.CODE, id_fromX=:old.IDX WHERE NUMBER=:old.NUMBER');
  END
end ^^

but I get error from the server:

Execute statement error at jrd8_prepare :\
335544569 : Dynamic SQL Error
335544436 : SQL error code = -104
335544634 : Token unknown - line 1, column 23
335544382 : .
Statement : UPDATE Y SET CODE=:old.CODE, id_fromX=:old.IDX WHERE NUMBER=:old.NUMBER\
Data source : Internal::
At trigger 'XYZ' line: 15, col: 7

Static update like this below:

CREATE TRIGGER XYZ FOR X ACTIVE AFTER INSERT OR UPDATE POSITION 0 AS
begin
if  (new.CODE is distinct from old.CODE)  then
BEGIN
EXECUTE STATEMENT ('UPDATE Y SET CODE=1, id_fromX=111 WHERE NUMBER=1');
END
end ^^
SET TERM ; ^^

works perfect.
How to reference to X table fields to update table Y (fields with similar names)?

Answer 1

You’re using a colon, but the old/new records don’t use it. Also, don’t use a execute statement here, since the sql statement is static.

Change it to:

SET TERM ^^ ;
CREATE TRIGGER XYZFOR X ACTIVE AFTER INSERT OR UPDATE POSITION 0 AS
begin
  if  (new.CODE is distinct old.CODE)  then
  BEGIN
    UPDATE Y 
       SET CODE = old.CODE, id_fromX = old.IDX 
     WHERE NUMBER = old.NUMBER;
  END
end ^^