[DOCS] current_schemas()

[Halley Pacheco de Oliveira]

I would like to know how to use current_schemas(), since SELECT 
current_schemas(); didn't work in
PostgreSQL 7.4 and 8.0 psql.

Halley

PostgreSQL 8.0.3 Documentation
Chapter 16. Server Run-time Environment
16.4. Run-time Configuration

The current effective value of the search path can be examined via the SQL 
function
current_schemas(). This is not quite the same as examining the value of 
search_path, since
current_schemas() shows how the requests appearing in search_path were resolved.

teste=# \dn
* QUERY **
SELECT n.nspname AS "Name",
   u.usename AS "Owner"
FROM pg_catalog.pg_namespace n LEFT JOIN pg_catalog.pg_user u
   ON n.nspowner=u.usesysid
WHERE   (n.nspname NOT LIKE 'pg\\_temp\\_%' OR
 n.nspname = (pg_catalog.current_schemas(true))[1])
ORDER BY 1;
**

List of schemas
Name|  Owner
+--
 information_schema | postgres
 pg_catalog | postgres
 pg_toast   | postgres
 public | postgres
(4 rows)

teste=# SELECT current_schema();
 current_schema

 public
(1 row)

teste=# SELECT current_schemas();
ERROR:  function current_schemas() does not exist
HINT:  No function matches the given name and argument types. You may need to 
add explicit type
casts.







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Re: [DOCS] current_schemas()

[Alvaro Herrera]

On Tue, Jul 05, 2005 at 08:14:40AM -0300, Halley Pacheco de Oliveira wrote:

> teste=# SELECT current_schemas();
> ERROR:  function current_schemas() does not exist
> HINT:  No function matches the given name and argument types. You may need to 
> add explicit type
> casts.

alvherre=# select current_schemas(true);
   current_schemas   
-
 {pg_catalog,public}
(1 fila)

alvherre=# select current_schemas(false);
 current_schemas 
-
 {public}
(1 fila)


Function parameters are essential when determining if a function exists
or not.

alvherre=# \df current_schema*
 Listado de funciones
   Schema   | Nombre  | Tipo de dato de salida | Tipos de datos de 
argumentos 
+-++--
 pg_catalog | current_schema  | name   | 
 pg_catalog | current_schemas | name[] | boolean
(2 filas)

-- 
Alvaro Herrera ()
FOO MANE PADME HUM

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