Thread: [GENERAL] Creating rule for sliding data

[GENERAL] Creating rule for sliding data

From
"F. BROUARD / SQLpro"
Date:
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
Enseignant Arts & Métiers PACA, ISEN Toulon et CESI/EXIA Aix en Provence
Audit, conseil, expertise, formation, modélisation, tuning, optimisation
*********************** http://www.sqlspot.com *************************



Re: [GENERAL] Creating rule for sliding data

From
"F. BROUARD / SQLpro"
Date:
I am answering to myseilf...

the good syntax is something like :


CREATE RULE R_U_MSR_BEFORE2000x
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  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 = OLD.MSR_ID    AND  MSR_DATE = OLD.MSR_DATE    AND  MSR_MESURE = OLD.MSR_MESURE    AND  NOT (
OLD.MSR_DATE< DATE '2000-01-01' );
 
);

The problem is nowhere in the doc there is a mention where much more 
than one commande must be place into brackets !

A +

-- 
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
Enseignant Arts & Métiers PACA, ISEN Toulon et CESI/EXIA Aix en Provence
Audit, conseil, expertise, formation, modélisation, tuning, optimisation
*********************** http://www.sqlspot.com *************************



Re: [GENERAL] Creating rule for sliding data

From
Guillaume Lelarge
Date:
Hi,

On Sun, 2011-10-09 at 18:50 +0200, F. BROUARD / SQLpro wrote:
> I am answering to myseilf...
> 
> the good syntax is something like :
> 
> 
> CREATE RULE R_U_MSR_BEFORE2000x
> 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
>    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 = OLD.MSR_ID
>      AND  MSR_DATE = OLD.MSR_DATE
>      AND  MSR_MESURE = OLD.MSR_MESURE
>      AND  NOT ( OLD.MSR_DATE < DATE '2000-01-01' );
> );
> 
> The problem is nowhere in the doc there is a mention where much more 
> than one commande must be place into brackets !
> 

As a matter of fact, it does:

CREATE [ OR REPLACE ] RULE name AS ON eventTO table [ WHERE condition ]DO [ ALSO | INSTEAD ] { NOTHING | command | (
command; command ... ) }
 
                                            ^                       ^                                            |
                |
 
See -----------------------------------------+------------------------

Extract from
http://www.postgresql.org/docs/9.1/interactive/sql-createrule.html


-- 
Guillaume http://blog.guillaume.lelarge.info http://www.dalibo.com



Re: [GENERAL] Creating rule for sliding data

From
Guillaume Lelarge
Date:
On Sun, 2011-10-09 at 21:17 +0200, F. BROUARD / SQLpro wrote:
> Hi,
> 
> Le 09/10/2011 19:07, Guillaume Lelarge a écrit :
> > Hi,
> >
> > On Sun, 2011-10-09 at 18:50 +0200, F. BROUARD / SQLpro wrote:
> >> I am answering to myseilf...
> >>
> >> the good syntax is something like :
> >>
> >>
> >> CREATE RULE R_U_MSR_BEFORE2000x
> >> 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
> >>     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 = OLD.MSR_ID
> >>       AND  MSR_DATE = OLD.MSR_DATE
> >>       AND  MSR_MESURE = OLD.MSR_MESURE
> >>       AND  NOT ( OLD.MSR_DATE<  DATE '2000-01-01' );
> >> );
> >>
> >> The problem is nowhere in the doc there is a mention where much more
> >> than one commande must be place into brackets !
> >>
> >
> > As a matter of fact, it does:
> >
> > CREATE [ OR REPLACE ] RULE name AS ON event
> >   TO table [ WHERE condition ]
> >   DO [ ALSO | INSTEAD ] { NOTHING | command | ( command ; command ... ) }
> >
> >                                               ^                       ^
> >                                               |                       |
> > See -----------------------------------------+------------------------
> >
> > Extract from
> > http://www.postgresql.org/docs/9.1/interactive/sql-createrule.html
> >
> >
> 
> Please give a real example instead of copying the doc that I have read a 
> lot !
> 
> I am not so stupid to have post this topic without having try many 
> syntaxes wich does not works !
> 

I don't think you're stupid. You said the doc was wrong, and I answered
you it wasn't. But I understand it didn't help you solve your issue...

Anyway, if you gave us the error message, it would be easier to answer
you. Here is the error message I get:

ERROR:  relation "new" does not exist
LINE 18:    FROM   NEW                  ^

And actually, you can't use "FROM NEW". And this:
 INSERT INTO T_MESURE_MSR SELECT MSR_ID, MSR_DATE, MSR_MESURE FROM   NEW WHERE NOT ( OLD.MSR_DATE < DATE '2000-01-01'
)

has no meaning at all in PostgreSQL.


-- 
Guillaume http://blog.guillaume.lelarge.info http://www.dalibo.com