[GENERAL] Creating rule for sliding data

Hello,

I have a problem to find the good syntax for a rule for rows going for
one partition to the other in cas of an update.

Let me give the conditions :

1 - having a mother table

CREATE TABLE T_MESURE_MSR
(
MSR_ID INT NOT NULL,
MSR_DATE DATE NOT NULL,
MSR_MESURE FLOAT NOT NULL
);

2 - having 2 child table :

CREATE TABLE T_MESURE_BEFORE2000_MSR
(
CHECK ( MSR_DATE < DATE '2000-01-01')
) INHERITS (T_MESURE_MSR)

CREATE TABLE T_MESURE_AFTER1999_MSR
(
CHECK ( MSR_DATE >= DATE '2000-01-01')
) INHERITS (T_MESURE_MSR)

THE QUESTION...

How to make the proper rule for T_MESURE_MSR il a rox goes from 1998 to
2003 ?

This one does not work :

CREATE RULE R_U_MSR_BEFORE2000
AS
ON UPDATE TO T_MESURE_MSR
WHERE ( NEW.MSR_DATE < DATE '2000-01-01' )
DO INSTEAD
-- rows does not change partition :
UPDATE T_MESURE_BEFORE2000_MSR
SET MSR_ID = NEW.MSR_ID,
MSR_DATE = NEW.MSR_DATE,
MSR_MESURE = NEW.MSR_MESURE
WHERE ( OLD.MSR_DATE < DATE '2000-01-01' );

-- rows does change partition (first INSERT NEWs then DELETE OLDs)
INSERT INTO T_MESURE_MSR
VALUES ( NEW.MSR_ID,
NEW.MSR_DATE,
NEW.MSR_MESURE )
WHERE NOT ( OLD.MSR_DATE < DATE '2000-01-01' );

DELETE FROM T_MESURE_MSR
WHERE MSR_ID = OLD.MSR_ID
AND MSR_DATE = OLD.MSR_DATE
AND MSR_MESURE = OLD.MSR_MESURE
WHERE NOT ( OLD.MSR_DATE < DATE '2000-01-01' );

And no more for this one :

CREATE RULE R_U_MSR_BEFORE2000
AS
ON UPDATE TO T_MESURE_MSR
WHERE ( NEW.MSR_DATE < DATE '2000-01-01' )
DO INSTEAD
-- rows does not change partition :
UPDATE T_MESURE_BEFORE2000_MSR
SET MSR_ID = NEW.MSR_ID,
MSR_DATE = NEW.MSR_DATE,
MSR_MESURE = NEW.MSR_MESURE
WHERE ( OLD.MSR_DATE < DATE '2000-01-01' );

-- rows does change partition (first INSERT the NEWs then DELETE the OLDs)
INSERT INTO T_MESURE_MSR
SELECT MSR_ID,
MSR_DATE,
MSR_MESURE
FROM NEW
WHERE NOT ( OLD.MSR_DATE < DATE '2000-01-01' );

DELETE FROM T_MESURE_MSR
WHERE (MSR_ID, MSR_DATE, MSR_MESURE)
IN (SELECT MSR_ID, MSR_DATE, MSR_MESURE
FROM OLD
WHERE NOT ( OLD.MSR_DATE < DATE '2000-01-01' ));

Any idea ?

Thanks

--
Frédéric BROUARD - expert SGBDR et SQL - MVP SQL Server - 06 11 86 40 66
Le site sur le langage SQL et les SGBDR : http://sqlpro.developpez.com
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