Hi Bartek
One more question, In oracle, when you create table using the default option, 
the parent table can't be delete if there is any child table exist. Usually, I 
won't use the cascade option.  I will truncate or delete one by one. what is 
postgresql default for these???
 
 
Thanks.
 
Regards.
 
Grace




At 2012-04-04 01:15:40,"Bartosz Dmytrak [via PostgreSQL]" 
<ml-node+s1045698n561586...@n5.nabble.com> wrote:
One more thing:
TRUNCATE has option CASCASE:
http://www.postgresql.org/docs/9.1/static/sql-truncate.html


I don't remember since when, but 9.X has this option.


Another thing: Do You really need this function.....
AFAIK since 8.4 postgres has TRUNCATE privilage on Table 
http://www.postgresql.org/docs/9.1/static/sql-grant.html
this is not the same as DELETE so, I think it is enough to grant this privilage 
to user

Regards,
Bartek



2012/4/3 leaf_yxj <[hidden email]>
Tom,

Thanks.  I found out the key issue it. It's because the truncate command
can't have the "cascade".

For the other people reference. The right funcitons are :


***********************************************************

CREATE OR REPLACE FUNCTION truncate_t (IN tablename text)
RETURNS VOID
AS
$$
BEGIN

       EXECUTE 'TRUNCATE TABLE ' || quote_ident(tablename) || ';';

EXCEPTION
       WHEN undefined_table THEN
               RAISE EXCEPTION 'Table "%" does not exists', tablename;

END;
$$
LANGUAGE plpgsql SECURITY DEFINER STRICT;

***********************************************************


***********************************************************

CREATE OR REPLACE FUNCTION truncate_t (tablename text)

RETURNS VOID
AS
$$
BEGIN

       EXECUTE 'TRUNCATE TABLE ' || quote_ident(tablename) || ';';

EXCEPTION
       WHEN undefined_table THEN
               RAISE EXCEPTION 'Table "%" does not exists', tablename;

END;
$$
LANGUAGE plpgsql SECURITY DEFINER STRICT;

***********************************************************



usage : select truncate_t ('aaa');


Thanks everybody's help.

Regards.

Grace

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