Обсуждение: Re: pl/pgsql docs 37.4.3. Row Types -- how do I use this

>Unless your function parameter is an integer you must quote it... eq:
>
>select use_two_tables('tablename');
>

Hrm... That does not work either:

# select use_two_tables('tablename');
ERROR:  function use_two_tables("unknown") does not exist
HINT:  No function matches the given name and argument types. You may need
to add explicit type casts.
# select use_two_tables('tablename'::text);
ERROR:  function use_two_tables(text) does not exist
HINT:  No function matches the given name and argument types. You may need
to add explicit type casts.


I am not really sure... just learning this, but I believe the parameter
type is tablename, right?


>>CREATE TABLE tablename(  ...

>>CREATE or REPLACE FUNCTION use_two_tables(tablename) RETURNS text AS '
>>...

Do I need to cast the string to something?

# \df use_two*
                        List of functions
Result data type | Schema |      Name      | Argument data types
------------------+--------+----------------+---------------------
text             | lee    | use_two_tables | tablename
(1 row)

# select use_two_tables('tablename'::tablename);
ERROR:  cannot cast type "unknown" to tablename
# select use_two_tables(tablename::tablename);
ERROR:  column "tablename" does not exist

Thanks for your help.

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Lee Harr <missive@hotmail.com> said:

> >Unless your function parameter is an integer you must quote it... eq:
> >
> >select use_two_tables('tablename');
> >
>
> Hrm... That does not work either:
>
> # select use_two_tables('tablename');
> ERROR:  function use_two_tables("unknown") does not exist
> HINT:  No function matches the given name and argument types. You may need
> to add explicit type casts.
> # select use_two_tables('tablename'::text);
> ERROR:  function use_two_tables(text) does not exist
> HINT:  No function matches the given name and argument types. You may need
> to add explicit type casts.

Why not just use a text type in your definition?

CREATE or REPLACE FUNCTION use_two_tables(text) RETURNS text AS ...

You can always do a cast inside the procedure if you need to.

Best regards,

Jim Wilson