Re: Anonymous Code Blocks as Lambdas?

On Oct 26, 2009, at 1:16 PM, Pavel Stehule wrote:

> I have a idea about migration of outer (psql) variables, and custom
> shell variables.
>
> some like:
>
> psql --allow_custom_variables --table_name=mytable
>
> inside psql we should to use :table_name variable with  "mytable" as  
> content.
>
> then we can use syntax
>
> do (table_name varchar) $$
> begin
>  raise notice 'TABLENAME IS %', table_name;
>  return;
> end;
> $$
>
> so with this mechanism we can to simply parametrise plpgsql "do"
> scripts from outer environment.

How is this different from psql :variables? And why would a `DO`  
feature be tied directly to psql?

Confused,

David