Обсуждение: casting behavior of oids and relation names

salah jubeh <s_jubeh@yahoo.com> writes:
> In some cases when I cast the oid to relation names ('xxxx'::regclass::text) �I get �schemaname.tablename and in some
casesI just get tablename. I thought at the�beginning,�this is due name duplication of tables in different�schemas�but
itseems not. �Also, this seems as a schema option because it happen only in certain schemas. �How I can get a
consistentnames of the casting ?� 

That's a feature, not a bug --- it doesn't qualify the name if
qualification is unnecessary given your current search_path.

For user tables, you could force it to always qualify by setting
search_path to empty, I think.

            regards, tom lane

On May 16, 2012, at 9:20 AM, salah jubeh wrote:

>
> In some cases when I cast the oid to relation names ('xxxx'::regclass::text)  I get  schemaname.tablename and in some
casesI just get tablename. I thought at the beginning, this is due name duplication of tables in different schemas but
itseems not.  Also, this seems as a schema option because it happen only in certain schemas.  How I can get a
consistentnames of the casting ?  
>

If tablename exists in search_path then it will not show the schemaname. Its normal behavior.
You can create function something like given below for consistent names and can use it:
CREATE OR REPLACE FUNCTION pg_get_relname(oid) RETURNS text
as
$$
SELECT n.nspname||'.'|| c.relname as "Name" FROM pg_catalog.pg_class c
     LEFT JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace
WHERE c.relkind='r' and c.oid=$1
$$ language sql;


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Vibhor Kumar
EnterpriseDB Corporation
The Enterprise PostgreSQL Company
Blog: http://vibhork.blogspot.com