Обсуждение: Using schema

Hi,

I tried to figure out how to select a particular schema before executing
statement on its objects without having to specify the schema in these
statements (cf. the instruction USE supported in some other RDBMS)

PostgreSQL allows modifying dynamically the schema search path:
 SET search_path TO my_schema, public;

http://www.postgresql.org/docs/current/static/ddl-schemas.html
http://www.postgresql.org/docs/current/static/sql-set.html

By doing so, the creation statements will be executed in the schema
my_schema.
 SET search_path TO public; CREATE TABLE foo(i int); SET search_path TO my_schema, public; CREATE TABLE foo(i int);
            List of relations Schema   | Name  |   Type   |    Owner
-----------+------------------+-------------public    | bar   | table    | dbo_ubilivemy_schema | foo   | table    |
dbo_ubilive


The cool thing with this, compared to the USE statement supported by
some other RDBMS, is that the user is not restricted to one given schema
without explicit schema declaration: SELECT * FROM foo;                          -- Uses schema my_schema SELECT * FROM
bar;                         -- Uses schema public SELECT * FROM foo, bar WHERE foo.i = bar.i; -- Uses both schemas 

That is damn flexible! :-)

--
Daniel

On Nov 30, 2007 9:00 AM, Daniel Caune <daniel.caune@ubisoft.com> wrote:

> The cool thing with this, compared to the USE statement supported by
> some other RDBMS, is that the user is not restricted to one given schema
> without explicit schema declaration:
>
>   SELECT * FROM foo;                          -- Uses schema my_schema
>   SELECT * FROM bar;                          -- Uses schema public
>   SELECT * FROM foo, bar WHERE foo.i = bar.i; -- Uses both schemas
>
> That is damn flexible! :-)

Hehe.  yeah, every time I have to use Oracle at work I feel like I'm
putting on a straight jacket.