Обсуждение: INSERT into VIEW

Hello!

PostgreSQL 6.4.2.

ran=> create table t (some_number int4, some_string text);
CREATE
ran=> insert into t values(-1,'a');
INSERT 20362 1
ran=> insert into t values(1,'d');
INSERT 20363 1
ran=> create view v as select * from t where some_number>=0;
CREATE
ran=> insert into v values (17,'q');
INSERT 20375 1
ran=> select * from t;
some_number|some_string
-----------+-----------        -1|a                   1|d          
(2 rows)
  What is 20375? Is it real OID of dummy row?

Oleg.
----    Oleg Broytmann     http://members.xoom.com/phd2/     phd2@earthling.net          Programmers don't die, they
justGOSUB without RETURN.
 

>
> Hello!
>
> PostgreSQL 6.4.2.
>
> ran=> create table t (some_number int4, some_string text);
> CREATE
> ran=> insert into t values(-1,'a');
> INSERT 20362 1
> ran=> insert into t values(1,'d');
> INSERT 20363 1
> ran=> create view v as select * from t where some_number>=0;
> CREATE
> ran=> insert into v values (17,'q');
> INSERT 20375 1
> ran=> select * from t;
> some_number|some_string
> -----------+-----------
>          -1|a
>           1|d
> (2 rows)
>
>    What is 20375? Is it real OID of dummy row?

    It's the OID of the real row that got stored into relation v.

    Do a

      DROP RULE "_RETv";
      SELECT * FROM v;

    and you'll get back your (17,'q') row.

    Maybe you should read now some chapters  in  the  programmers
    manual  about  the  implementation  of views, the rule system
    etc.


Jan

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